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VC-A582VC-A582VC-H982
In the interests of user-safety (Required by safety regula-tions in some countries) the set should be restored to itsoriginal condition and only parts identical to those specifiedbe used.
SY7J5VCA582U/
MODELS
SERVICE MANUAL
This document has been published to be used for
after sales service only.The contents are subject to change without notice.SHARP CORPORATION
CONTENTSPage
1. GENERAL INFORMATION .............................. 41-1 FEATURES .................................................4
1-2 SPECIFICATIONS ..................................... 4
1-3 LOCATION OF MAJOR COMPONENTSAND CONTROL ......................................... 5
2. DISASSEMBLY AND REASSEMBLY .............. 6
2-1 DISASSEMBLY OF MAJOR BLOCKS ....... 62-2 DISASSEMBLING THE MECHANISM/
MAIN PWB ASSEMBLY ............................. 72-3 CARES WHEN REASSEMBLING.............. 8
3. FUNCTION OF MAJOR MECHANICAL
PARTS ..............................................................94. ADJUSTMENT, REPLACEMENT AND
ASSEMBLY OF MECHANICAL UNITS .......... 114-1 MECHANISM CONFIRMATION
ADJUSTMENT JIG .................................. 115. ELECTRICAL ADJUSTMENT ........................ 305-1 ADJUSTMENT OF HEAD SWITCHING
POINT .......................................................31
Page5-2 ADJUSTMENT OF FV (False Vertical Sync)
OF STILL PICTURE................................. 315-3 CHECKING OF OFF TRACK ................ 31
5-4 ADJUSTMENT OF SIF-INPUT LEVEL .... 325-5 ADJUSTMENT OF FILTER...................... 32
5-6 ADJUSTMENT OF STEREO VCO........... 325-7 ADJUSTMENT OF STEREO
SEPARATION ...........................................326. MECHANISM OPERATION FLOWCHART
AND TROUBLESHOOTING GUIDE .............. 33
7. TROUBLESHOOTING ................................... 398. BLOCK DIAGRAM ..........................................51
9. SCHEMATIC DIAGRAM AND PWB FOILPATTERN .......................................................61
10.REPLACEMENT PARTS LIST ....................... 77
11.EXPLODED VIEW OF MECHANICALPARTS ............................................................ 90
12.PACKING OF THE SET ................................. 95
VIDEO CASSETTE RECORDER
VC-A582UVC-A582U(A)VC-H982U
VC-A582U/A582U(A)
VC-H982U
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IMPORTANT SERVICE NOTES
WARNING :TO REDUCE THE RISK OF FIRE OR ELEC-TRIC SHOCK, DO NOT EXPOSE THIS AP-PLIANCE TO RAIN OR MOISTURE.
RISK OF ELECTRIC SHOCKDO NOT OPEN
CAUTION
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK. DONOT REMOVE COVER. NO USER-SERVICEABLEPARTS INSIDE. REFER SERVICING TO QUALIFIEDSERVICE PERSONNEL.
This symbol warns the user of uninsulated voltage
within the unit that can cause dangerous electric shocks.
This symbol alerts the user that there are importantoperating and maintenance instructions in the literature
accompanying this unit.
This symbol mark means fast operating fuse.
For continued protection against risk of fire, replaceonly with same type fuse F901 (1.6A, 125V).
CAUTION:
BEFORE RETURNING THE VIDEO CASSETTERECORDER
Before returning the video cassette recorder to the user,perform the following safety checks.
1. Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged betweenthe chassis and other metal parts in the video cassetterecorder.
2. Inspect all protective devices such as non-metalliccontrol knobs, insulation materials, cabinet backs,adjustment and compartment covers or shields, isola-tion resistor/capacitor networks, mechanical insula-tors etc.
3. To be sure that no shock hazard exists, check forcurrent in the following manner.
Plug the AC line cord directly into a 120 volt AC outlet(Do not use an isolation transformer for this test).
Using two clip leads, connect a 1.5k ohm, 10 wattresistor paralleled by a 0.15F capacitor in series withall exposed metal cabinet parts and a known earth
ground, such as a water pipe or conduit. Use an SSVM or VOM with 1000 ohm per volt, or
higher, sensitivity or measure the AC voltage dropacross the resistor (See Diagram).
Move the resistor connection to earth exposed metalpart having a return path to the chassis (antenna,metal cabinet, screw heads, knobs and control shafts,
SSVMAC SCALE
1.5k ohms.10W
CONNECT TOKNOWN EARTHGROUND
TO EXPOSEDMETAL PARTS
0.15 FTEST PROBE
etc.) and measure the AC voltage drop across theresistor. Reverse the AC plug on the set and repeatAC voltage measurements for each exposed part.Any reading of 0.45V rms (this corresponds to 0.3mArms AC.) or more is excessive and indicates a poten-tial shock hazard which must be corrected beforereturning the video cassette recorder to the owner.
1.6A 125V
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PRECAUTIONS IN PART REPLACEMENT
When servicing the unit with power on, be careful to the section marked white all over.
This is the primary power circuit which is live.
When checking the soldering side in the tape travel mode, make sure first that the tape has been loaded and then turn
over the PWB with due care to the primary power circuit.
Make readjustment, if needed after replacement of part, with the mechanism and its PWB in position in the main frame.
(1) Start and end sensors: Q701 and Q702Insert the sensors projection deep into the upper hole of the holder. Referring to the PWB, fix the sensors tight
enough.
(2) Photocoupler: IC901Refer to the symbol on the PWB and the anode marking of the part.
(3) Cam switches A and B: D708 and D709.Adjust the notch of the part to the white marker of the symbol on the PWB. Do not allow any looseness.
(4) Take-up and supply sensors: D707 and D706.
Be careful not to confuse the setting direction of the parts in reference to the symbols on the PWB. Do not allow anylosseness.
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1. GENERAL INFORMATION1-1 FEATURES
10.Daylight Saving Time11.3-Language OSD
12.19 m System (EP Mode)13.Universal R/C14.S picture
15.Instant Replay16.EZ Set Up (Automatically Channel set up)
17.High speed FF/REW (*360)
1. 8 Hours of Recording/Playback(T-160)
2. 181 ch Cable Ready With Frequency Synthesizer Tuner3. CM Skip Search4. Automatic Playback Function
5. Blue Screen & On Screen Set-up Programming Function
6. Full Loading System7. Simple Recording Timer8. Tamper Proof Function
9. Automatic Tracking System
1-2 SPECIFICATIONS
1) Recording systemFormat: VHS NTSC standard
Luminance signal: FM recordingChroma signal: Low frequency converted direct recording
Color system: NTSCNumber of video head: 4
Tape speed: SP (33.35mm/sec.)LP (16.67mm/sec.) (playback only)EP (11.12mm/sec.)
2) Video signalInput level: 0.5 ~ 2.0Vp-p, 75 ohm Unbalanced
Output level: 1.0Vp-p, 75 ohm UnbalancedHorizontal resolution: 220 lines (SP mode)Signal to noise ratio: 45dB (SP mode)
3) Audio signalInput level: 8dBs (309mVrms, 47k ohm)
Output level: 8dBs (309mVrms, 1k ohm)Frequency response: 80Hz ~ 10kHz (SP mode linear), 20Hz ~ 20kHz (Hi-Fi mode)Signal to noise ratio: 43dB (SP mode linear)
Hi-Fi Dynamic range: 90dB (VC-H982U)
Wow and flutter: 0.005% max. (Hi-Fi mode) with T-120 tape4) Receiving channel
VHF: Channels 2 ~ 13UHF: Channels 14 ~ 69
CATV: Channels A-8, A-5 ~ W + 84Antenna input Impedance: VHF/UHF; 75 ohm
5) Misc.Fast forward/Rewind time: Approximate 1 minute with T-120 cassette
Power source: 120V, 60HzPower consumption: 20W
Allowable ambient temperature: with T-120 tape 5C to 40C (41F to 104F)Operating humidity: below 80% RH
Dimensions: 360 (W), 261(D), 92(H) mm (14-11/64, 10-9/32, 3-5/8 inch)Weight: 2.7kg (5.8 lbs)
Accessories included: 75 ohm coaxial cable, Operation manual, Registration cardinfrared remote control, Battery (2 pcs.)
Note: Specifications may be changed for improvement without notice.
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1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL
RemoteCo
ntrol
MajorComponents
ofYourVCR
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SHARP
4
3
1
1110
8
9
6
5
2
7
MAIN FRAMEFRONT PANEL
MECHANISM/MAIN PWBASSEMBLY
2. DISASSEMBLY AND REASSEMBLY
2-1 DISASSEMBLY OF MAJOR BLOCKS
TOP CABINET
SHUTTLE SWITCH KNOB
TOP CABINET : Remove 3 screws1.FRONT PANEL : Remove shuttle switch knob2.
Remove 1 screw3and 7 clips4.OPERATION : Remove 1 screw 5. Take it out(SHUTTLE JOG) of connector6.PWB
DRUM SHIELD : Remove 1 screwqwith drum shield.MECHANISM/ : Remove 2 screws7, 1 screw8, 1MAIN PWB screw 9. Remove 1 screw 0with
antenna terminal cover.
ANTENNATERMINALCOVER
DRUMSHIELD
OPERATIONPWB
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MECHANISM CHASSIS
MAIN PWB
2-2 DISASSEMBLING THE MECHANISM/MAIN PWB ASSEMBLY
4
CASSETTEHOUSING
1
3
2
1. When removing the mechanism from the main PWB,
remove the antenna cover 1 screw1, and remove theantenna cover.Remove the PWB bottom plate 1 screw2.Remove the FFC cable (AA, AD, AH)3which connectsthe PWB and the mechanism.
Take out vertically the mechanism so that it does not
damage the adjacent parts.
2. Removing the mechanism and cassette controllerRemove 2 screws4fixing the cassette controller to themechanism, and remove the cassette controller.
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END SENSOR
START SENSOR
AC CONNECTOR
2-3 CARES WHEN REASSEMBLING
INSTALLING THE CASSETTE CONTROLLERWhen the cassette controller is installed on the mecha-nism, the initial setting is essential condition.There are two initial setting methods, namely electrical andmechanical.1. Electrical initial settingSo as to perform initial setting of mechanism execute the
Step 1 of Installation of cassette housing. After ascertainingthe return to the initial setting position (*1) install the
cassette controller. (Conditions: When mechanism andPWB have been installed)
2. Mechanical initial settingFeed the pulley feed gear of loading motor with screwdriver. After ascertaining the return to the initial set position(*1) install the cassette controller in the specified position.
(This method is applied only for the mechanism.)
INSTALLING THE MECHANISM ON PWBLower vertically the mechanism, paying attention to themechanism edge, and install the mechanism with due careso that the parts are not damaged. So as to fix the mecha-nism to the main PWB install two housings. (Fit the antennacover to one of them. For other, fix the vicinity of loadingmotor and solder joint side of main PWB.) Connect againthe FFC cable (AA-MH, AD-ME, AH-MH) between themechanism and the main PWB.
PARTS WHICH NEED PARTICULAR CAREWhen installing the mechanism chassis on the PWB unit,take care so as to prevent deformation due to contact ofmechanism chassis with REC TIP SW.
Pulley feed gear
Screwdriver
Tilt mark (*1)
AE CONNECTOR
AL CONNECTOR
REC TIP SW
Casecondrive gear
Drive angle ofcassette control
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3. FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)
1715 1027
11
5
9
14
12
8
161346
2
7
3
1
18
No. Function No. Function
1 Full erase head
2 Sup pole base
3 Tension arm
4 Idler assy
5 Pinch drive lever assy
6 Supply reel disk
7 Sup main brake
8 Tu main brake
9 Pinch drive cam
10 A/C Head assy
11 Reverse guide
12 Casecon drive gear
13 Take-up reel disk
14 Pinch roller lever assy
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FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)
No. Function No. Function
15 Upper and lower drum assy
16 Loading motor
17 Drum motor
18 Tu pole base assy
19 Slow brake
20 Master cam
21 Capstan D.D. motor
22 Reel belt
23 Clutch lever
24 Limiter pulley ass'y
25 Casecon drive gear
26 Shifter
27 Fixing guide
26
24
21
22
19
20
25
23
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4. MECHANISM ADJUSTMENT, REPLACEMENT, ASSEMBLING AND CLEAN-ING METHODS
The explanation given below relates to the on-site general service (field service) but it does not relates to the adjustment
and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement andadjustment service must be performed by the person who have finished the technical courses.
4-1 MECHANISM CONFIRMATION ADJUSTMENT JIG
So as to perform completely the mechanism adjustment prepare the following special jigs. So as to maintain the initialperformance of the machine the maintenance and check are necessary. Utmost care must be taken so that the tape isnot damaged. If adjustment needs any jig, be sure to sue the required jig.
JiGTG1200 CN
JiGMP0001 BY
1. Torque Cassette Meter JiGVHT-063 CZ
No. Jig ltem Part No. Code Configuration Remarks
JiGTG0090 CM
3. Torque Gauge Head JiGTH0006 AW
5.JiGRH0002 BR
JiGSG2000 BS
JiGSG0300 BF6.
7. JiGADP003 BK
8.
9. JiGDRiVER11055 AR
2. Torque Gauge
Tension Gauge
These Jigs are used for checking
and adjusting the reel disk height.
When fixing any part to the threaded
hole using resin with screw, use thejig. (Specified torque 5 kg)
This cassette torque meter is used for check-ing and adjusting the torque of take-up formeasuring tape back tension.
These Jigs are used for checking
and adjusting the torque of take-upand supply reel disks.
Master Plane Jig andReel Disk Height
Adjusting Jig
Pinch pressing forcemeasuring jig
Reverse guide heightadjusting box driver
This Jig is used for height adjustment of thereverse guide (for reverse guide height ad-justment).
13. JiGRVGH-F18 BU
This screwdriver is used for adjusting theguide roller height.
For X value adjustment
VROATSV CD
These tapes are especially used forelectrical fine adjustment.
VROEFZCS BG 1k 19m
This Jig is used for heightadjustment of the reverse guide.
Hex Wrench (1.5 mm) JiGHW0015 AE
Guide roller heightadjustment drive
12. JiGDRiVER-6 BM
10. Alignment Tape
X value adjustmentgear type screw driver
Reverse Guide Height
Adjusting Jig
These Jigs are used for loosening ortightening special hexagon type
screws.
This Jig is used with the tensiongauge. Rotary transformer clearance
adjusting jig.
There are two gauges used for thetension measurements, 300 g and2.0kg.
Hex Wrench (1.2 mm) JiGHW0012 AE
4. Torque Driver JiGTD1200 CB
Black Level(only SYNC) signal
11. JiGDRiVERH-4 AP
Video Audio HiFi Audio Track
525 Monoscope 7k 58m
NTSC Color Bar 1k 58m
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MAINTENANCE CHECK ITEMS AND EXECUTION TIME
Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.
Parts
Maintained 500hrs.
1000hrs.
1500hrs.
2000hrs.
Guide roller assy
Sup Guide Shaft
Retaining guide
Slant pole
Full-erase head Colour and beating
Clean tape contact part withthe specified cleaning liquid.
Abnormal rotation or significant vi-bration requires replacement.
RemarksPossible symptom
encountered
3000hrs.
Lateral noises Headoccasionally blocked
Small sound or sound
distortion
Upper and lower drum assyPoor S/N ratio, no colourPoor flatness of the enve-
lope with alignment tape
No tape running, uneven
colour
Clean rubber and rubber
contact area with thespecified cleaning liquid.
Pinch rollerNo tape running, tapeslack
No tape running, tapeslack, no fast forward/rewind motion
Capstan D.D. Motor
Reel belt
Cassette not loaded or
unloaded
Idler assy
Tension band assy Screen swaying
Loading Motor
Limiter pulley
Supply/take-up Main brake levers Tape slack
A/C head
No tape running, tapeslack
NOTE: : Part replacement. : Cleaning : Oil refilling
Cleaning liquid Industrial ethyl alcohol
* This mechanism does not need electric adjustment with variable resistor. Check parts. If any deviation is found, cleanor replace parts.
Clean tape contact area withthe specified cleaning liquid.
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Figure 4-1.
Reassembly1. Before installing the cassette housing control, short-
circuit TP801 provided at the center (when facing to themain PWB), press the eject button. The casecon drive
gear turns and stops when the positioning mark ap-pears. Engage two teeth of casecon drive gear with thethree teeth of casecon drive angle gear, and set on the
mechanism chassis as shown below.
Figure 4-2.
2. Install in the reverse order of removal.
Notes:1. When fitting the S/E sensor holder to the cassette
controller frame L/R, take care.
2. Misengagement of teeth of casecon drive gear and driveangle gear causes malfunction. (The cassette cannot beset, load and ejection are repeated).
3. In the case when you use the magnet screw driver, neverapproach the magnet driver to the A/C head, FE head,
and drum.
4. When installing or removing, take care so that thecassette housing control and tool do not contact theguide pin or drum.
5. After installing the cassette housing control once per-
form cassette loading operation.
TO RUN A TAPE WITHOUT THE CASSETTEHOUSING CONTROL ASSEMBLY1. Remove the full-surface panel.2. Short-circuit TP801.3. Plug in the power cord.4. Turn off the power switch.
(The pole bases move into U.L.position.)5. Open the lid of a cassette tape by hand.6. Hold the lid with two pieces of vinyl tape.7. Set the cassette tape in the mechanism chassis.8. Stabilize the cassette tape with a weight (500g) to
prevent floating.9. Turn on the power switch.10. Perform running test.
REMOVING AND INSTALLING THE CASSETTEHOUSING Removal1. In the cassette removing mode remove the cassette.2. Unplug the power cord.
3. Remove in the following numerical order.a) Remove two screws1.b) Slide and pull up the cassette housing control.
1
Casecondrive gear
Casecon driveangle gear
500g
Figure 4-3.
Mechanism chassisWeight to preventfloat (500g)
Note:The weight should not be more than 500g.
To take out the cassette tape.
1. Turn off the power switch.2. Take out the cassette tape.
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REEL DISK REPLACEMENT AND HEIGHTCHECK Removal1. Remove the cassette housing control assembly.2. Pull the tension band out of the tension arm ass'y.3. Remove the Sup/Tu main brake ass'y.4. Open the hook at the top of the reel disk, and remove the
reel disk.Note:
Take care so that the tension band ass'y and main brakeass'y (especially soft brake) are not deformed.
4. Assemble the Sup main brake ass'y.Notes:1. When installing the reel disk, take due care so that the
tension band ass'y is not deformed and grease does noadhere.
2. Do not damage the Sup main brake ass'y. Be careful so
that grease does not adhere to the brake surface.
Reassembly (Take-up reel disk)
1. Clean the reel disk shaft and apply grease (SC-141) toit.
2. Align the phase of the reel disk to that of the reel relay
gear and to install a new take-up reel disk onto the shaft.3. Check the reel disk height and reassemble the take-up
main brake ass'y.Note:1. Take care so that the Tu main brake ass'y is not
damaged. Take care so that grease does not adhere the
brake surface.2. After reassembly, check the video search rewind back
tension (see page 17), and check the brake torque (seepage 19).
Height checking and adjustmentNote:
1. Set the master plane with due care so that it does not
contact the drum.2. When putting the master plane, shift the reverse guide
a little in the loading direction. Care must be taken sinceexcessive shift results in damage.
Figure 4-6.
Note: Check that the reel disk is lower than part A but higher
than part B. If the height is not correct, readjust the reeldisk height by changing the poly-slider washer under the
reel disk.
Figure 4-4.
Note:When the tension band ass'y is pressed in the direction ofthe arrow for removal, the catch is hard to be deformed.
Figure 4-5.
Reassembly (Supply reel disk)1. Clean the reel disk shaft and apply grease (SC-141) to
it.2. Match the phases of reel disk and reel relay gear, and set
the new reel disk.3. After checking the reel disk height, wind the tension
band ass'y around the reel disk, and insert into the holeof tension arm ass'y.
Tension arm ass'y
Supply reel disk Take-up reel disk
Master plane
Reverseguide
Positionpin
Sup main brake ass'y
Tu main brake ass'y
Supply reel disk
Cassette lockrelease shaft
Take-up reel disk
Tension band ass'y
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Note:Whenever replacing the reel disk, perform the height check-ing and adjustment.
Notes:1. Hold the torque gauge by hand so that it is not moved.2. Do not keep the reel disk in lock state. Do not allow long-
time measurement.
CHECKING AND ADJUSTMENT OF TAKE-UPTORQUE IN REWIND MODE Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
Setting1. Set a torque gauge to zero on the scale. Place it on the
supply reel disk.2. Press the rewind button.3. To calculate the remaining capacity, slowly rotate the
take-up reel disk, and then shift it into the rewind mode.
Checking1. Turn the torque gauge slowly (one rotation every 2 to 3
seconds) by hand in the CCW direction.
2. Make sure that the indication of torque gauge is not lessthan 30mNm (306gfcm).
AB
Figure 4-7.
Master planeReel disk heightadjusting jig
Mechanism chassis
Reel disk
10 0.2mm Reel disk
CHECKING AND ADJUSTMENT OF TAKE-UPTORQUE IN FAST FORWARD MODE Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center(facing to the main PWB), plug in the power cord.
Setting
1. Set a torque gauge to zero on the scale. Place it on thetake-up reel disk.
2. Press the FF button.3. To calculate the remaining capacity of the play back
mode, slowly rotate the supply reel disk, and then shiftit into the forward mode.
Checking1. Turn the torque gauge slowly (one rotation every 2 to 3
seconds) by hand in the CW direction.2. Make sure that the indication of torque gauge is not less
than 30mNm (306gfcm).
Figure 4-9.
Torque gauge
30mNm (306gfcm)or more
Supply reel disk
Idler ass'y
The gauge is held atits maximum value.
(Red mark)
Adjustment
1. If the rewind winding-up torque is less than the specifiedvalue, clean the capstan D.D. motor pulley, drive belt,
and limiter pulley with cleaning liquid, rewind again, andcheck the winding-up torque.
2. If the winding-up torque is still out of range, replace thedrive belt.
Figure 4-8.
Torque gauge
30mNm (306gfcm)or more
The gauge is held atits maximum value.(Red mark)
Idler ass'y
Adjustment1. If the FF winding-up torque is less than the specified
value, clean the capstan D.D. motor pulley, drive belt,and limiter pulley with cleaning liquid, and check again.
2. If the torque is less that the set value, replace the reelbelt.
CCW
CW
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Notes:1. Hold the torque gauge by hand so that it is not moved.2. Do not keep the reel disk in lock state. Do not allow long-
time measurement.
CHECKING AND ADJUSTMENT OF TAKE-UPTORQUE IN RECORD/PLAYBACK MODE Remove the cassette housing control assembly. After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
Turn off the power switch. Open the cassette torque meter lid, and fix it with
tape. Load the cassette torque meter into the unit. Put the weight (500g) on the cassette torque meter. Turn on the power switch. Press the picture record button, and set EP picture
record mode (x3).
CHECKING AND ADJUSTMENT OF TAKE-UPTORQUE IN VIDEO SEARCH REWIND MODE Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center(facing to the main PWB), plug in the power cord.
SettingPress the playback button and rewind button to set thevideo search rewinding mode.
Checking1. Place the torque gauge on the supply reel disk, and turn
it counterclockwise very slowly (one rotation every 1 to2 seconds) and check that the torque is within the setvalue 14.0 3.9mNm. (144 40gfcm)
Figure 4-11.
Torque gauge
Supply reel disk
Note:Surely put the torque gauge on the reel disk to measure. Ifthe torque gauge is raised, accurate measurement is
impossible.
Adjustment1. If the rewinding playback winding-up torque is not within
the setting, replace the limiter pulley assembly.
Note:
The winding-up torque fluctuates due to variation of rota-tion torque of supply reel disk. Read the center value offluctuation as setting.
CCW
Set value EP6.9 2.5mNm (70 25gfcm)
500g
Cassette torque meter
Figure 4-10.
Checking1. Make sure that value is within the setting 6.92.5mNm
(7025gfcm).2. The winding-up torque fluctuates due to variation of
rotation torque of limiter pulley ass'y. Read the center
value of fluctuation as setting.3. Set the EP record mode (x3) and make sure that the
winding-up torque is within setting.
AdjustmentIf the playback winding-up torque is not within the setting,replace the limiter pulley assembly.Note:When the torque cassette is set, put a weight (500g) toprevent rise.When the cassette torque meter is taken out.Turn off the power switch.
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Figure 4-13.
1. Detach the pinch roller from the capstan shaft.Do not separate excessively. Or the pinch lever andpinch double action lever may disengage.
2. Engage the tension gauge adapter with the pinch roller
shaft, and pull in the arrow direction.3. Gradually return the pinch roller, and measure the
pulling force when the pinch roller contacts the capstanshaft.
4. Make sure that the measured value is within setting 0.9to 11.8 N (900 to 1,200g).
CHECKING AND ADJUSTMENT OF TENSIONPOLE POSITION Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
Setting1. Turn off the power switch.2. Open the cassette tape (T-120), and fix with tape.
3. Set the cassette tape in loading state.4. Put the weight (500g) on the cassette tape.5. Turn on the power switch.
6. Make the adjustment with the beginning of a T-120 tape.
CHECKING THE VIDEO SEARCH REWINDBACK TENSION Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center(facing to the main PWB), plug in the power cord.
Checking1. After pressing the play button, press the rewind button,
and set the video search rewind mode.2. Place the torque gauge on the take-up reel disk, and turn
it counterclockwise very slowly (one rotation every 2 to3 seconds) and check that the torque is within the setvalue 3.41.5mNm (3515gfcm).
Pinch rollerTension gauge900 - 1,200g
Capstan shaft
Tension gauge adapter
Figure 4-12.
Torque gauge
Take-up reel disk
Notes:
Set the torque gauge securely on the take-up reel disk.If it is not secure, the measurement will be incorrect.
CHECKING THE PINCH ROLLER PRESSURE Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
CheckingPress the play button to set the playback mode.
CCW
Figure 4-14.
500g
(T-120)
Weight to preventfloat (500g)
Checking1. Set a cassette tape, push the REC button to place the
unite in the SP record mode. Now check the tension poleposition.
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2. Visually check to see if the right edge of the tension poleis within the 1.5 0.25 from the right edge of the Supguide shaft.
Insert the slotted screwdriver in the tension pole adjuster,
and rotate clockwise.
Figure 4-17.
At left side from the center line
Figure 4-15.
Figure 4-16.
Insert the slotted screwdriver in the tension pole adjuster,and rotate counterclockwise.
At right side from the center line
Tension pole adjuster adjusting range
1.6-0.1-0.6
1.5 0.25
1.5 0.25
1.5 0.25
Sup guide shaft
Adjust so that the delta mark of tension pole adjuster iswithin 90range (left, right).
CHECKING AND ADJUSTMENT OF RECORD/
PLAYBACK BACK TENSION Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.
Setting1. Turn off the power switch.2. Open the torque cassette meter and fix with tape.
3. Set the cassette tape in loading state.4. Put the weight (500g) on the cassette torque meter.5. Turn on the power switch.
Make the adjustment with the beginning of a T-120 tape.
Tension pole adjuster
90
90
Figure 4-18.
Tension pole
500g
Weight to preventfloat (500g)
Cassette torquemeter
Figure 4-19.
Checking1. Push the REC button to place the unit in the SP record
mode.2. At this time ascertain that the back tension is within the
setting (36.5 to 52gcm) by seeing the indication oftorque cassette meter.
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Adjustment1. If the indication of torque cassette meter is lower than
the setting, shift the tension spring engagement to the
part A.2. If the indication of torque cassette meter is higher than
the setting, shift the tension spring engagement to the
part B.
Checking the brake torque at the take-up side
Figure 4-22.
CCW: 8.8~23.5mNm (90~240gfcm)
CW: 4.9~11.8mNm (50~120gfcm)
Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center(facing to the main PWB), plug in the power cord.
Setting1. Switch from the FF mode to the STOP mode.2. Disconnect the power cord.3. Set a torque gauge to zero on the scale. Place it on the
take-up reel disk.
Checking1. Turn the torque gauge at a rate of about one turn/2 sec
in the CCW direction/CW direction so that the reel diskand torque gauge pointer rotates at equal speed and
make sure that the value is within the setting (CCWdirection: 8.8 to 23.5mNm (90 to 240gfcm), CW direc-tion: 4.9 to 11.8 mNm (50 to 120gfcm).
2. Adjustment of the brake torque at the supply side and thetake-up side
Unless the supply side brake torque or take-up sidebrake torque is within the setting, clean the felt surfaceof reel disk (supply, take-up) brake lever, check again
the brake torque. If value cannot be set within the setting yet, replace the
main brake ass'y or main brake spring.
Figure 4-20.
CHECKING THE BRAKE TORQUE Checking the brake torque at the supply side
CCW: 3.9~9.8mNm (40~100gfcm)
CW: 8.8~23.5mNm (90~240gfcm)
Figure 4-21.
Remove the cassette housing control assembly.
After short-circuiting TP801 provided at the center(facing to the main PWB), plug in the power cord.
Setting1. Set a torque gauge to zero on the scale. Place it on the
supply reel disk.
2. Switch from the FF mode to the STOP mode.3. Disconnect the power cord.
CheckingTurn the torque gauge at a rate of about one turn/2 secin the CW direction/CCW direction with respect to the
supply reel disk so that the reel disk and torque gaugepointer rotate at equal speed, and make sure that the
value is within the setting (CW direction: 8.8 to 23.5mNm(90 to 240gfcm); CCW direction: 3.9 to 9.8mNm (40 to100gfcm).
Tension arm
Tension spring
CW
CCW CW
Supply reel disk
Torque gauge
Torque gauge
CCW
Take-up reeldisk
A B
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Figure 4-24.
Replacement1. Solder the removed PWB to the new head assembly.
2. Adjust the height from the A/C head arm (lower surface)to the A/C head plate to 10.8mm with slide calipers. (3places of azimuth screw section, tilt screw section and A/C head front section) (See the figure below.)
3. Align the left end of gear of A/C head arm with thepunched mark of chassis, tentatively tighten the screws
1and2so as to ensure smooth motion of A/C headarm. Tentative tightening torque must be 0.15 to 0.20
Nm (1.5 to 2.0kgfcm).
REPLACEMENT OF A/C (Audio/Control) HEAD1. Remove the cassette housing control assembly.2. In unloading state unplug the power cord.
Removal1. Remove the screws123, Azimuth screw, Tilt screw.2. Unsolder the PWB fitted to the A/C headNotes:1. When replacing, never touch the head. If you touched,
clean with the cleaning liquid.2. When removing the screw 3, take care so that the
spring may spring out.
New A/C head ass'y
A/C head PWB
2
Spring 1
Solder
Never touch the head
10.8mm10.8mm
Azimuth screw
Height screw
Tilt screw
A/C head plate
Figure 4-25.Note:1. If the screws1and2are tighten tentatively too loose,
the azimuth and height of A/C head may change whenthey are finally tightened. Therefore care must be taken.
2. After completion of A/C head be sure to adjust taperunning. (Execute the running adjustment by the methoddescribed in Page 22, 23.)
Punched line mark on chassis
Left end of A/C head arm gear
1
2
3
Height screw
Figure 4-23.
3
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500g
Figure 4-26.
Figure 4-27.
Height screw
Azimuth screw
Tilt screw
Cassette tape
Weight to preventfloat (500g)
Mechanism chassis
Tape
0.3mm
A/C head
AdjustmentAdjust the height screwvisually so that the control head isvisible 0.3mm below the bottom of the tape.
1. Set the cassette tape in the unit.2. Press the PLAY button to put the unit in the playback
mode.3. Roughly adjust the height of the A/C head by turning the
height screw until the tape is in the position shownbelow.
A/C HEAD HEIGHT ROUGH ADJUSTMENT
Setting
HEIGHT ADJUSTMENT OF REVERSE GUIDE
1. Adjust the height from the mechanism chassis to the
reverse guide lower flange to 13.38 mm, using thereverse guide height adjustment jig, in tape loading
state. (Refer to Figure 4-28 (a) (b).)
Figure 4-29.
3. Set the tape, and check for tape crease near the reverseguide in the playback mode.
If crease is found, turn the reverse guide adjustment nutto remove crease. (As for crease check refer to Figure 4-30.)
(a) (b)Figure 4-28.
2. Rotate counterclockwise the reverse guide height ad-justment nut 1/10 turn. (For height adjustment use the
reverse guide height adjustment box driver (JiGDRiVER11055)).
13.38mm
Box driver
Height adjusting nut
500g
Capstanmotor shaft
Mechanismchassis
Reverse guide
En example ofcrease near thereverse guide
Weight toprevent float (500g)
Fixing guide
* Check for crease from the A direction.
Figure 4-30.
CCW
A
Reverse guide height
adjusting jigReverse guide heightadjusting jig
Reverse guide
Mechanismchassis
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ADJUSTMENT OF TAPE DRIVE TRAIN1. Tape run rough adjustment1 Remove the cassette housing control assembly.2 After shortcircuiting TP801 provided at the center
(facing to the main PWB), plug in the power cord.3 Check and adjust the position of the tension pole.
(See page 18.)4 Check and adjust the video search rewind back
tension. (See page 17.)
5 Connect the oscilloscope to the test point for PBCHROMA envelope output (TP201). Set the syn-chronism of the oscilloscope to EXT. The PBCHROMA signal is to be triggered by the headswitching pulse (TP202).
6 Set the alignment tape (VROATSV) to play. (Put a500g weight on the cassette tape to prevent lift ofcassette tape.)
Notes:1. Previously set the tracking control in the center position,
and adjust the envelop waveform to maximum with X
value adjustment nut. Thereby the tape run rough ad-justment is facilitated.
2. Especially the outlet side envelope waveform must have
higher flatness.
Figure 4-32.
2. Adjustment of A/C head height and azimuth1 Perform the initial setting of A/C head position by the
method stated in "Page 20 Replacement 3".2 Connect the oscilloscope to the audio output termi-
nal.
3 Using the alignment tape in which 1 kHz linear audiosignal has been recorded, adjust the height screw so
as to get max audio output.4 Using the alignment tape in which 7 kHz linear audio
signal has been recorded, adjust the azimuth screwso as to get max audio output.
500g
Figure 4-31.
7 Press the tracking button (+), () and change theenvelope waveform from max to min and from min tomax. At this time make sure that the envelope
waveform changes nearly parallel.8 Unless the envelope waveform changes nearly par-
allel, adjust the height of supply side and take-upside guide roller so that the envelope waveformchanges nearly parallel. (For envelop adjustment
procedure refer to Figure 4-35.)9 Turn the tilt screw to remove the tape crease at the
fixing guide flange.Play back the tape and check for tape crease at the
fixing guide flange.(1) If there is no tape crease
Turn the tilt screw clockwise so that tape crease
appears once at the flange, and then return the tiltscrew so that the crease disappears.
(2) If there is tape creaseTurn counterclockwise the tilt screw so that the
tape crease disappears.(Reference) If the tilt screw is turned clockwisecrease appears at the lower flange.
Guide roller
Weight of 500g
Cassette Tape
Figure 4-33.
For X value adjustmentAdjust the X value, turning the gear-type screwdriver.
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3. Tape run adjustment1 Connect the oscilloscope to PB CHROMA envelope
output test point, set oscilloscope sync to EXT,
trigger-input the PB CHROMA signal (head switch-ing pulse).
2 Rough adjustment of X valueTentatively fix A/C head arm screws1and2by themethod described in Page 20 "Replacement 3".Play back the alignment tape (VROATSV)(VC-
H982U), and shortcircuit TP802. As a result the auto-tracking is automatically cancelled, so that the Xvalue adjustment mode is set.
Move the A/C head with the X value adjustment geardriver (JiGDRiVER-6) by the method shown in Fig-
ure 4-33, and adjust the A/C head so as to get themaximum envelope waveform. (Note: When the A/C
head is adjusted, adjust so that the maximum en-velop waveform is obtained nearest the position ofinitial setting made in Page 20.)
3 Next, change the alignment tape to VROEFZCS toplayback. Press the tracking button (+), () and
change the envelope waveform from max to min and
PB CHROMAEnvelope
CH-1 CH-2
Head switching pulseFigure 4-34.
When the tape is above the helical lead. When the tape is below the helicallead.
Take-up side Supply side Take-up side
Adjustment
Supply side
Supply side guide rollerrotated in clockwisedirection (lowers guideroller) to flattenenvelope.
Take-up side guide rollerrotated in clockwisedirection (lowers guideroller) to flattenenvelope.
Supply side guide rollerrotated in counterclock-wise direction (raisesguide roller) to make thetape float above the helicallead. The supplyside guide roller is thenrotated in the clockwisedirection to flatten theenvelope.
Take-up side guide rollerrotated in counterclock-wise direction (raisesguide roller) to make thetape float above thehelical lead. The take-upside guide roller is thenrotated in the clockwisedirection to flatten theenvelope.
Figure 4-35.4. A/C head X value adjustment
1 Tentatively fix A/C head arm screws1and2by themethod described in Page 20 "Replacement 3".
2 Playback the alignment tape (VROEFZCS), andshortcircuit TP802. As a result the auto-tracking is
automatically cancelled, so that the X value adjust-ment mode is set.
3 Move the A/C head with the X value adjustment geardriver by the method shown in Figure 4-33, andadjust the A/C head so as to get the maximum
envelope waveform. (Note: At this time adjust so asto get the maximum envelope waveform nearest the
A/C head position which has been set in case of Xvalue rough adjustment as stated in Page 23, 3-2.)
4 Tighten finally the screws 1 and 2. Be sure totighten at first the screw1and then the screw2.
Final tightening torque is 0.6Nm (If the screw2istightened first, the X value may deviate.)
5 Adjust the playback switching point (Refer to theelectric adjustment method.)
6 Playback the self-picture-recorded tape, and checkthe flatness of envelope waveform and sound.
Note:When the A/C head X value adjustment is performed, be
sure to perform at first X value rough adjustment (refer toPage 23, 3-2). 1
2
Figure 4-36.
from min to max. At this time adjust the height ofsupply and take-up side guide roller with the adjust-ment driver (JiGDRiVERH-4) so that the envelope
waveform changes nearly parallel.4 If the tape is lifted or sunk from the helical lead
surface, the PB CHROMA envelope waveform ap-pears as shown in Figure 4-35.
5 Press the tracking button (+), () and make sure thatthe envelope waveform changes nearly parallel.
6 Finally check tape crease near the reverse guide. Iftape crease is found, remove it as stated in Page 21"HEIGHT ADJUSTMENT OF REVERSE GUIDE"
item 3.
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REPLACEMENT OF DRUM D.D. MOTOR1. Set the ejection mode.2. Withdraw the main power plug from the socket.
Removal (Perform in numerical order.)1. Disconnect the FFC cable1.2. Unscrew the D.D. stator assembly fixing screws2.3. Take out the D.D. stator assembly3.4. Unscrew the D.D. rotor assembly fixing screws4.
5. Take out the D.D. rotor assembly5.
Notes:1. In removing the D.D. stator assembly, part of the drum
earth spring pops out of the pre-load collar.
Be careful not to lose it.2. Install, so that the D.D. rotor ass'y and upper drum ass'y
mounting direction check holes align.
(Align the upper drum dent with the rotor hole.)3. Be careful not to damage the upper drum or the video
head.4. Protect the hole elements from shock due to contact with
D.D. stator or D.D. rotor ass'y.
5. After installation adjust the playback switching point foradjustment of servo circuit.
REPLACEMENT OF THE CAPSTAN D.D.(DIRECT DRIVE) MOTOR Remove the mechanism from the main PWB (refer to
Page 7 "1. When removing the mechanism from themain PWB").
Removal (Follow the order of indicated numbers.)
1. Remove the reel belt1.
Figure 4-37.
2. Remove the three screws2. Reassembly1. Taking care so that the capstan shaft does not contact
the mechanism chassis, set its position on the mecha-nism chassis, and then install with the three screws.
2. Install the reel belt.Notes:1. After installing the capstan D.D. motor, be sure to rotate
the capstan D.D. motor and check the movement.2. Set the tape, and check for the tape crease near the
reverse guide in the playback mode. Adjust the A/C
head and azimuth as stated in Page 22 item 2. If creaseis found, adjust as stated in Page 21 "HEIGHT ADJUST-MENT OF REVERSE GUIDE".
Figure 4-38.
Capstan D.D.motor
Capstan D.D. motorcontrol PWB
2
12
4
3
4
5
1
D.D. stator ass'y
D.D. rotor ass'y
FFC
Upper drum
Reel belt
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ASSEMBLING OF PHASE MATCHINGMECHANISM COMPONENTS Assemble the phase matching mechanism compo-
nents in the following order.1. Assemble the pinch roller assembly and pinch drive
cam.2. Mounting the shifter (on the back of the mechanism
chassis).3. Mounting the master cam (on the back of the mecha-
nism chassis).4. Assemble the connection gear, slow brake and loading
motor parts.
Pinch drive cam and pinch roller assemblingmethod.
(Place the following parts in position in numerical order.)
(1)Reverse drive lever1(2)Reverse guide spring2(3)Reverse guide lever assy3(4)Reverse guide height adjusting nut4(5)Pinch drive cam5
(6)Pinch roller assy6(7)Open lever7
REPLACING THE UPPER AND LOWER DRUMASSEMBLY
Replacement (Perform in the numerical order)
1Remove the motor as stated in Page 24 D.D. motorreplacement.
2Remove the drum earth brush2.3Remove the drum base3from the upper and lower
drum assembly1.
[Cares when replacing the drum]
1. Be careful so that the drum earth brush is not lost.2. Do not touch directly the drum surface.
3. Fit gently the screwdriver to the screws.4. Since the drum assembly is an extremely precise as-
sembly, it must be handled with utmost care.5. Make sure that the drum surface is free from dust, dirt
and foreign substances.
6. After replacing the drum be sure to perform the taperunning adjustment.
After that, perform also the electrical adjustment. Playback switching point adjustment
X-position adjustment and check Standard and x-3 slow tracking adjustment
7. After replacing the drum clean the drum.
Figure 4-40.
7
4
3
2
6
1
5
Figure 4-39.
2
1
3
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1Insert Reverse Guide Lever Assy
Figure 4-41-1.
Figure 4-41-3.Figure 4-41-2.
Phase Matching Point2
Pinch Roller DoubleAction Lever Ass'y Open lever
2Insert Pinch Roller/Pinch Double Action Lever Assy. 3Insert Open Lever.
Insert reverse guide lever ass'y
Align here.2Insert pinch drive cam
Pinch drive lever ass'y
Fit the pinch drive cam so that the notch of pinchdrive cam aligns with the dent of pinch drive leverassembly.
Fit the pinch drive cam so that the notch of
pinch drive lever assembly aligns with thehalf-round notch of chassis.
Turn the reverse guide leverassembly counterclockwiseto the stopper.
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Figure 4-43.
INSTALLING THE SHIFTER
Figure 4-42.
1. Make sure that the loading gear is at the point 1asshown below.
2. Install, paying attention to6 insertion points and3release points.
3. For the phase matching at the insertion point1, see thepoint2as shown below.
4. Finally fix the inserts1and4.
CapstanD.D. motor
Drum
Reel pulley
(Bottom side of mechanism chassis)
Sifter
Phase-Matchingpoint2
Insertpoint1
Half round notch
Shaft1
Round mark
Loading gear (T)
Insert
point3
Insertpoint2
Insertpoint4
Insertpoint6
Releasepoint3
Rotationpoint2
Phase-matchingpoint1
Shaft1
Shaft1
Shaft4
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INSTALLING THE MASTER CAM (AT REARSIDE OF MECHANISM CHASSIS)1. Make sure beforehand that the shifter is at the point as
shown below.2. Place the master cam in the position as shown below.
Note:See the figure below for the phase matching between themaster cam and the casecon drive gear.3. Finally fix with the E ring.
REPLACEMENT OF LOADING MOTOR Removal
Replacement1. Remove the loading motor, and install the replacement
loading motor as shown below.
Figure 4-46.
Figure 4-44-2.
When installing the master cam,align the casecon drive gearround mark with the half-roundnotch of master cam.
The loading motor pressing-in must be less than 14.7 N
(15 gf).Adjust the distance between motor and pulley to 10.2 mm).
E ring(XRESJ30-06000)
Master cam
Fully turnclockwise
Fully turn counterclockwise
Figure 4-44-1.
Face the wide tooth side ward
Master cam
Casecon drive gear
10.2 mm
Round mark
Half-round notch
+0.20.2
Apply grease
Apply grease
No grease
Figure 4-45.
+0.20.2
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2. Synchro Gear, Drive Gear L and Drive Gear R
ASSEMBLY OF CASSETTE HOUSING1. Drive Gear and R Drive angle assy
Figure 4-47.
MSPRT0381AJFJ
Apply grease
Apply grease
Apply grease
LANGF9592AJFW
Top surface should be free from scratches or soil.
Drive angle
Drive gear R
Frame
Figure 4-48.
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5. ELECTRICAL ADJUSTMENT
Notes: Before the adjustment:
Electrical adjustments discussed here are often required after replacement of electronic components and mechanicalparts such as video heads.Check that the mechanism and all electric components are in good working condition prior to the adjustments,otherwiseadjustments can not be completed.
Instruments required: Color TV monitor Dual-trace oscilloscope Audio signal generator AC milli-voltmeter Blank video cassette tape Alignment tape (VROATSV) Screwdriver for adjustment Color bar generator RF signal generator
Figure 5-1.
`1
`2
`3
`5
`4
`6`7
`8
`1 ... TP201-204`2 ... R163`3 ... TP161-163`4 ... TP168-169`5 ... TP164-165`6 ... TP801`7 ... R724`8 ... TP802
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SERVO CIRCUIT ADJUSTMENT
5-1 ADJUSTMENT OF HEAD SWITCHINGPOINT
Measuring Color TV monitorinstrument
Mode Playback still
Cassette Self-recorded tape (SP mode)
(See Note below 2)
Control Tracking control buttons(+) or ()
Specification No vertical jitter of picture
1. Play a cassette which was recorded by the unit in SPmode.
2. Press the PAUSE/STILL button to freeze the picture.3. Look at the monitor screen and adjust (+) or () TRACK-
ING buttons so that the vertical jitter of the picture isminimized.
4. Play and freeze the self-recorded tape in EP mode andmake sure vertical jitter of the picture is not noticeable.
Note:1 The FV goes back to the its initial state when the unit isput into the system controller reset mode due to powerfailure, etc.In this case, preset the FV once again.
2 Self-recorded tape is a cassette whose program wasrecorded by the unit being adjusted.
Measuring Color TV monitorinstrument
Mode Playback
Cassette Self-recorded tape (EP mode)(See Note below)
Control Tracking control buttons(+) or ()
Specification No Poor picture and Hi-Fi sound
1. Play a cassette which was recorded by the unit in EPmode.
2. Short circuit between TP802 on the main PWB, andpress both CH button (+) and CH button () at same time.
3. Press the tracking buttons (+) and () 20 times each tobring the tracking off center. Make sure that:
1) There is nothing unusual on the playback screen.2) There is nothing unusual in the Hi-Fi sound (for the Hi-Fi models only).
5. Cancel the short circuit.Note:Self-recorded tape is a cassette whose program was re-corded by the unit being adjusted.
5-2 ADJUSTMENT OF FV (False VerticalSync) OF STILL PICTURE
5-3 CHECKING OF OFF TRACK
Measuring Dual-trace oscilloscopeinstrument
Mode Playback
Cassette Alignment tape (VROABZGS)
Test point VIDEO OUT jack to CH2TP202 (Sig.)~TP203 (GND) to CH1
Control R724 Head switching point adjust-ment control
Specification 5.50.5H (lines)
1. Remove the front panel and play the alignment tape.2. Connect a dual-trace oscilloscope to the VIDEO OUT
jack and TP202 (Sig.) and TP203 (GND).(Trigger the oscilloscope with the head switching pulseon TP202.)
3. Playback the alignment tape, and then short circuitbetween TP802 on the main PWB, and press both CHbutton (+) and CH button () at same time.
4. Adjust R724 so that the leading edge of the headswitching pulse is 5.5H (lines) ahead of the vertical syncas shown in Figure 5-2.
5. Cancel the short circuited.
Figure 5-2.
5.50.5H (lines)CH-1HEADSWITCHINGPULSE
CH-2VIDEO OUT
CH-1: 1V/dev 50sec/devCH-2: 2V/dev 50sec/dev
V-sync.
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MTS CIRCUIT ADJUSTMENT.(HI-FI MODELS ONLY)
5-4 ADJUSTMENT OF SIF-INPUT LEVEL
Measuring AC milli-voltmeter and RF signalinstrument generator.
Mode E-E
Input signal RF CH-10 (at 1kHz 100%MOD.)
Test point AUDIO OUT jack
Control R141(S-IF ADJ.)
Specification 3 2dBs (1.2~2.0Vp-p)
1. Feed the RF signal CH-10 (at 1kHz 100%MOD.) toantenna terminal.
2. Connect the AC milli-voltmeter to AUDIO OUT jack.3. Adjust R141(S-IF ADJ.) so that the AC milli-voltmeter
reads 3 2dBs.
5-5 ADJUSTMENT OF FILTER
1. Make the short circuited to TP162 (Sig.)~TP163 (GND).2. Connect the AC milli-voltmeter to TP168(Sig.)~TP169
(GND).3. Make a note of the level of TP168 (Sig.)~TP169 (GND).4. Feed the 15.734kHz at 50mVrms signal to the
TP161(Sig.)~TP163 (GND).5. Adjust R163 (STEREO VCO ADJ.) so that the levels for
non signal inputed STEP 3. and inputed be just the
same.6. When the 15.734kHz at 50mVrms signal is fed confirm
the display "STEREO" is indicated on OSD.
5-7 ADJUSTMENT OF STEREO SEPARATION
5-6 ADJUSTMENT OF STEREO VCO
Measuring AC milli-voltmeterinstrument
Mode E-E
Input signal 15.734kHz at 50mVrms
Test point TP168 (Sig.),TP169 (GND)
Control R163 (STEREO VCO ADJ.)
Specification
1. Feed the RF signal CH-10 (300Hz and 3kHz 30%modulation) to antenna terminal.
2. Connect an Dual AC milli-voltmeter to left channel andright channel output terminales.
3. Set the audio signal to 300Hz and the modulation factorto 30% (Left channel only) and adjust R164 (SEPARA-
TION-1 ADJ.) so that the difference between left chan-nel and right channel outputs becomes maximized.
4. Set the audio signal to 3kHz and the modulation factorto 30% (right channel only) and adjust R165 (SEPARA-TION-2 ADJ.) so that the difference between left chan-nel and right channel outputs becomes maximized.
5. Repeat STEP 3. until obtain a specification.
1. Make the short circuited to TP162 (Sig.)~TP163 (GND).2. Connect the AC milli-voltmeter to TP164 (Sig.)~TP165
(GND).3. Feed the 22.9kHz at 245mVrms signal to the
TP161(Sig.)~TP163 (GND).4. Adjust R163 (FILTER ADJ.) so that the AC milli-voltmeter
reads minimized.
Measuring Dual AC milli-voltmeter and RFinstrument signal generator.
Mode E-E
Input signal RF CH-10 (300Hz and 3kHz 30%modulation)
Test point AUDIO OUT jack
Control R164 (SEPARATION-1 ADJ.)R165 (SEPARATION-2 ADJ.)
Specification maximized
Measuring AC milli-voltmeterinstrument
Mode E-E
Input signal 22.9kHz at 245mVrms
Test point TP164 (Sig.),TP165 (GND)
Control R163 (FILTER ADJ.)
Specification Minimized
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VC-A582VC-A582VC-H982
0510
15
20
25
Fmechanicaltiming
Mode
Rotationangle
Modecheck
Cammark
Modedetectionoutside
(D709SW
B)
Modedetectioninside
(D708SW
A)
CamgraphE
60
120
180
240
300
360
CA/END
CS/EJ
33.8
2
UL81
VSR
218
PU(LD)
188
PB
252
SLOW
269
CL
293
STOP
309
FF
325
Camswitch
0
Modedetectionoutside
Modedetectioninside
Ssensor
Ssensor
Moded
etectioninside
SensorA
Modedetectionoutside
SensorB
CS/EJ
ULD
PU
LD
VSR
PB
STILL
CL
STOP
FF
1 1 1 0 0 0 0 0 0
0 1 1 1 0 1 0 0 0
open
close
0 1EJ
UL
FF
PU
0 1 1
0 0 0
0 1 1or
0
1 1
10
1
0
0
0
0
0
1
1
1
1
1 1
VSR
PB
SLW
STP
CL
Loadingmotorturnsinreverse
direction
andmastercam
counterclockwise.
CASSETTEINSERTION
STOP
Cassette
inserting
Full-
loading
YES
YES
YES
NO
NO
NO
Unloading
Loading
motorstartsinnormal
direction
andmastercamcounter
clockwise.
Doesmechanismpositionsw.
comeoffwithin2.5
sec.?
Arestart/endsensorsatlowlevel
beforec
assetteinsertion?
Insertcassette.
Doub
leactionrackslides.
D
rummotorstarts.
Tapeloading.
Pinchrollercomesintocontact.
Cams
witchisatPBposition.
Lo
adingmotorstop.
Isdrum
FGpulseoutputted?
End
End
Cassette
isejectedandloading
motorstops.
Startsensorclose.
(Cassetteisjud
ged
caughthalfway.)
(CassetteLEDorsomeotherpart
isjudgeddefective.)
6.MECHANISMOPER
ATIONFLOWCHARTANDTROUBLESHOOTIN
GGUIDE
MECHANISMOPERATIONFLOWCHART
*Thisflowchartdescribestheo
utlineofthemechanismsoperation,butdoesnotgiveitsdetails.
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STOP
REC/PLAY
PLAY
STILL
PLAY
VSR
VSR
PLAY
Capstanmotorturns
counterclockwise.
Istake-upreelsensorsignal
outputted?
End
PressREC/PLAYkey.
Pictureappears.
Unloading
Setcapstanmotortosearch
speed.
End
PressFFkey.
PLAY
VSF
REC/PLAY
STOP
Capstanmotorturnsin
reversedirection.
Loadingmotorturnsin
counterclockwisedirection
andmastercamclockwise.
Slowbrakecomesinto
contactwithcapstanmotor.
Slowbrake
pressing
CamswitchisatSTILL
position.
End
Capstanmotorstops
.
PressSTOPkey.
Loadingmotorstops.
End
Stopcapstanmotor.
NO
YES
PressSTILLkey.
Pinch
roller
releasing
Idler
swinging
Pinch
roller
pressing
Loadingmotorturns
clockwisean
dmaster
camcounterclockwise.
Turncapstan
motorin
reversedirec
tion.
Turnloading
motor
counterclock
wise.
CamswitchisatVSR
position.
Setcapstanmotortosearch
speed.
Istake-upreelsensorsignal
outputted?
PressREWkey.
Release
pinchroller.
Camswitchis
atPU2position.
Camswitchis
atPU1position.
Stoploa
dingmotor.
Pressp
inchroller.
Loadingmotorturnsclockwise.
Releasethe
supplyauxiliary
brake.
Stoploa
dingmotor.
End
Unloading
C
amswitchisatPBposition.
End
PressPLAYKey.
L
oadingmotorturnscounter-
c
lockwiseandmastercam
c
lockwise.
C
apstanmotorturns
c
ounterclockwise.PBspeed.
NO
YES
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VC-A582VC-A582VC-H982
STOP
FF/REW
ST
OP
CASSETTEEJECT
FF/REW
STOP
NO
NO
FF/REW
operation
Brake
function
Turncapstanmotorin
normalorreversedirection,
aftertheremainingtapehas
beendetected.
Loadingmotorturnscounter-
clo
ckwise.
Ca
mswitcnisatStop
position.
End
PressSTOPkey.
PressFF/REWkey.
Stopcapstanmotor.
Loadingmotorstops.
End
Loadingmotorturn
sinclockwiseandmastercam
counterclockwise.
4supplyreelpulse
s
outputted?
Doesthetake-up
reelpulseoutput
twoedges?
Capstanmotorturns
clockwise.
Loadingmotorturn
s
clockwise.
Camswitchisat
Ejectposition.
Loadingmotor
stops.
Capstanmotor
stops.
PressEJECTkey.
Tape
unloading
Cassette
eject
End
Capstanmotorturns
clockwise.
Capstanmotorturns
counterclockwiseinabout
2seconds.
Stoploadingmotor.
Capstan
motorturnsinreversedirection.
Ca
mswitchisatULposition.
YES
YES
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C-A582UC-A582U(A)C-H982U
MECHAN
ISMTROUBLESHOOTING
1.FF/REWF
AILURE(NOTAPEWINDING)
PressFFkey.
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Ismastercamat
FFposition?
Doesloading
motoroperate?
Modeschang
ing
smoothlythro
ugh
camswitch?
Loadingmoto
r
controlsystem
introuble.
AreVco12V
and
Vcc5Vapplied?
Replacethe
capstanmoto
r.
Replacetheidler
assy.
Replacethereel
sensor.
Isvoltageapplied
toloadingmotor?
Loadingmotoris
damaged.Replace
it.
Voltagesupply
systemintrouble.
Modesensor
systemintrouble
ormastercam
malpositioned.
Volta
gesupply
systemintrouble.
Doescapstan
motorturninFF(or
REW)direction?
Areidlerwheel
assyandreeldisk
inmesh?
Isthepulse
outputtedfromreel
sensor?
Thecassettetape
ispresumably
damaged.
2.REC/PLAYFAILUR
E(MODERELEASE)
NONONONO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
Isthemastercam
atPBposition?
Doesloading
motoroperate?
Modeschanging
smoothlythrough
camswitch?
Loadingmotor
controlsystem
introuble.
AreVco12Vand
Vcc5Vapplied?
Replacethe
capstanmotor.
Replacetheidler
assy.
Replacethereel
sensor.
Isvoltageapplied
toloadingmotor?
Loadingmotor
is
damaged.Rep
lace
it. V
oltagesupply
systemintrouble.
Voltagesupply
systemintrouble.
Doescapstan
motorturn?
Areidlerwheel
ass'yandreeldisk
inmesh?
Isthepulse
outputtedfromreel
sensor?
CheckmainPWB.
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VC-A582VC-A582VC-H982
Replaceloadingmotorblock.
3.WINDINGFAILU
REATVSR
4.UNUSUALSOUNDINEACH
MODE
IsPlayback
functionnormal?
Mastercam
shiftingtoVSR
position?
Goto2.REC/
PLAYFAILURE
routine.
Replaceidler
gearassy.
Replacelimiter
pulleyassy.
Replacereel
sensor.
Goto2.REC/
PLAYFAILURE
routine.
Areidlerwheel
assyandsupply
reeldiskinmesh?
Issupplyreeldisk
windingtorque
normal?
Ispulseoutputted
fromreelsensor?
CheckmainPWB.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
NO
NO
YES
PressREWk
ey.
4-i)Unusualsoundincassette
insertionandejectionmode
Isunusalsoundheardduring
cassettecoutrolrunning?
Unusualsoundheardwithpinch
rollerlevergoingupordown?
Isunusualsoundheardduring
loading/unloading?
Checkpinchrollerdrivecam,
pinchroller
driveleverandreverseguide
fortheiractions.
Replacedamagedonewithnewone.
Replacecassettecontrolassy.
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C-A582UC-A582U(A)C-H982U
YES
YES
NO
NO
NO
NO
YES
YES
Replacecapstanmotor.
4-ii)UnusualsoundinFF/REWmode
Isreeldiskheightasspecified?
Thrustgapfoundatreeldisk?
Drivesystemoutofcontactwithany
partonmainPWB?
Turncapstanmotorbyhand.
Unusualsoundheard?
Checkdrivesystemsgearsfor
damage.Replacedamagedgear
withnewone.
Reeldisk
Limiterpulleyassy
Idlerwheelassy
Checkreeldiskandmaincha
ssis.
Andreplacedefectiveparts.
Adjustreeldiskheight.
Rearrangethepartsonm
ainPWB.
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VC-A582VC-A582VC-H982
7.TROUBLESHOOTIN
G
FLOWC
HARTNO.1POWERTROUBLESHOOTING(1)
Nopower
UnplugtheACpowercord.
Replugitafewminuteslater.
SeeFLOWC
HARTNO.2
POWER
TROUBLESHOOTING(2)
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Isthefusegood?
Replacefuse.
AreAT5Vvoltagelinenormal?
Checkprimarycircuit.
AreAT44V,
AT12V,-24V,
AT18V
andfilamentvoltagelinesnormal?
Checkeachrectifiercircuits
and
short-circuitofsecondarycircuit.
Is"H"levelappliedatpin(1)of
IC701?
CheckQ905andP-FAIL(L)
signallineetc.
Checksystemcontrolcircuit(IC701)
andcamswitchcircuit.
FLOWC
HARTNO
.2POWERTROUBLESHOOTING(2)
IncaseofFuse(F901)blownout.
ReplaceF901,
Q901andQ902,
check
D921~D925asaresultofcheck,
if
poor,replaceatthesametime.
Checkshort-circuitorleak
ofD905
thrutoD909,
D918andse
condary
circuit.
FLOWC
HARTNO
.3POWERTROUBLESHOOTING(3)
Incase
ofabnormalnoise(sound)
CheckD905thrutoD909andD918.
YES
YES
YES
NO
NO
NO
FLOWC
HARTNO.4POWERTROUBLES
HOOTING(4)
Incaseofoutputvoltageatlowlevel.
ChecktheD91
4,
Q903andQ904.
ReplaceD914,
Q903andQ904.
Che
ckIC901.
ReplaceIC901
Checkshort-circuitorleakofT901.
ReplaceT901.
Checkprimaryc
ircuit,Q
901,Q
902,
C907thrutoC9
09andC930.
FLOWC
HARTNO.5TIMER(1)TROUBLE
SHOOTING
Theflourescentdisplaytubefailslightup.
Isthesupplyvoltageof5Vfeedto
pin(18)ofIC801?
CheckAT5Vline.
Isthesupplynegativevoltageof-24V
feedtopin(16)o
fIC801?
Chec
knegativevoltagelineand
powe
rcircuit.
Isthere500kH
zoscillationat
pins(19)and(20)ofIC801?
Che
ckFL801andIC801.
Isfilamentvolta
geappliedbetween
(1)/(2)and(31)/(32)ofthe
flourescentdisp
laytube?
Alsonegativevoltageapplied
betweenthesepinsandGND.
Checkpowercircuitandperipheral
circuitofD952.
Doestheflourescentdisplaytube
function?
ReplaceIC5001.
Checkforcracksontheflourescent
displa
ytube.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
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FLOWC
HARTN
O.6TIMER(2)TROUBLESHOOTING
Doesthekeyswitchmakegood
contact?
Checkswitchcontact.
Isthereashortinthescanoutsor
keyinputs?
CheckalltheterminalsofIC
5001
andswitchesforpoorsolder
ing.
Arepulsesreceivedatpins(26)thru
(29)ofIC801whenthekeysare
activated?
Checklinesofkeyinandscanout.
CheckIC801,
IC701andFLPdata,
FLPclock,
FLPCSandkeydata.
YES
YES
Y
ES
N
O
N
O
NO
Key-in
inputisnotreceived.
FLOWC
HARTNO.7IN
FRAREDR/CTROUBLESHOOTING
Nooperationispossiblefromtheinfraredremotecontrol.
Doestheinfraredremotecontrol
function?
Replaceinfraredremotecon
trolas
required.
Isthesupplyvoltageof5Vfeedto
Vddterminalofremotecontrol
receiver?
CheckAT5VandGNDlines.
Is"L"pulsesentoutVoutterminalof
receiverwhentheinfraredremote
controlisactivated?
Replacereceiver.
CheckbetweenatVoutterminalof
receiverthrutopin(5)ofIC701.
ReplaceIC701.
YES
N
O
NO
N
O
N
O
N
O
NO
FLOWC
HARTNO.8CASSETTECONTROLTRO
UBLESHOOTING(1)
Acassettetapeisnottakein.
Isthecassetteho
usingdistroted?
Fixorre
placethecassettehousing.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Ch
eckstartsensorcover.
Checkstartsensorandalltheway
upthruto
pin(79)ofIC701.
CheckIC701andallthewayup
thrutop
in(2)ofIC703.
CheckIC703.
CheckbetweenIC703andloading
motor.
Replaceload
ingmotor.
Isthespecifiedvoltageappliedatthe
loadingmotorterminalwhenthe
cassettetapeisinserted?
Doespin(5)ofIC703changeto
about10Vwhenthecassettetapeis
inserted?
Doespin(2)ofIC703gotoa"H"
(about1.7
V)levelw
henthecassette
tapeisinserted?
Doespin(79)ofIC
701changefrom
"H"to"L"levelwhe
nthecassette
tapeisinserted?
Arestartsensorco
vergotoopen
whenthecassette
tapeisinserted?
NO
NO
NO
FLOW
CHARTNO.9CASSETTECONTROLTROUBLESHOOTING(2)
Acassettetapeistakenin,butejectedatonce.
Doesthestartsensorpulseatpin
(79)ofIC701chang
efrom"L"to"H"
levelwhenthecass
ettetapeis
loaded?
Checkstartsensorandalltheway
upthrutoIC701.
Doestheendsenso
rpulseatpin(85)
ofIC701changefro
m"L"to"H"level
whenthecassettetapeisloaded?
Checkendsensorandalltheway
upthrutoIC701.
Doesthemastercammodeshifter
operatenormallywh
enthecassette
tapeisloaded?
Checkcamswitchandalltheway
upthrutoIC701.
ReplaceIC701.
YES
YES
YES
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FLOWC
HARTNO.10LOADIN
GMOTORANDEJECTTROUBLESHOOTING
Thecassettetapefailstoeject.
Doesthecapstanmotorstartwhen
theEJECTbuttonispressed?
SeeFLOWC
HARTNO.12.
(CAPSTANMOTORTROU
BLE
SHOOTING)
Doesthetake-upreeldiskturnwhen
thecapstanmotorisrunning?
Checkreeldiskandreeldriveunit.
Arepulsesappliedatpin(2)ofIC701
whenthetake-upreeldiskisturning?
Checktake-upreelsensora
ndallthe
wayupthrutoIC701.
Isa"H"(about1.7
V)levelappliedat
pin(4)ofIC703whenareelpules
hasbeeninputted?
Checkpin(92)ofIC701
.
Isthevoltageabout10Vsentoutof
pin(7)ofIC703?
CheckIC703.
Isthespecifiedvoltageappliedatthe
loadingmotorterminal?
CheckbetweenIC703and
allthe
wayupthrutotheloadingm
otor.
Dosetheloadingmotorrun?
Replaceloadingmoto
r.
Replacecassettecam,g
ear,etc.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
FLOWC
HARTNO.11SYSTEMCONTROLTROUBLESHOOTING
Nopoweristurnedon.
Arekeydatapulses
appliedatpin
(15)ofIC701,
respectively?
CheckIC801andIC701,
andall
theway
thrubetweenthem.
AreFLPdatapulses,
FLPclockpulsesandFLPcontrolreadypulse
sappliedtopins(24),(23)
and(22)ofI801,re
spectively?
Doespowercontro
l(H)signalatpin
(94)ofIC701chan
gefrom"L"to"H"
level?
CheckIC701.
DoesthebaseofQ
951changefrom
about2.0
Vto5.0
V?
CheckQ
951andallthewayupthru
toQ952.
Is5Vsentoutofthe
emitterofQ951?
CheckQ951andtheAT5Vline.
Checkperiperalcircuitsforpoor
soldering.
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FLOWC
HARTNO.12CA
PSTANMOTORTROUBLESHOOTING
Thecap
stanmotorfailstorun.
Isthevoltagemorethanabout2.6
V
DCgivenoutofpin(32)ofIC701.
CheckIC701.
N
O
N
O
N
O
N
O
N
O
YES
YES
YES
YES
Y
ES
Isthesupplyvoltageof5Vfeedto
pin(8)ofMCconnector?
CheckPC5Vline.
Isthevoltagemorethan2.6
VDC
sentinpin(4)ofMCconnector?
CheckbetweentheMCconnector
andallthewayupthrutopin
(32)
ofIC701.
Isthevoltageatpin(3)ofMC
connector1.6~2.7
V?
Checkbetweenthepin(60)ofIC701
andallthewayupthrutopin(3)of
MCconnector.
Isthesupplyvoltageof12Vfeedto
pin(5)ofMCconnector?
CheckAT12Vlineandmotorvoltage
selectorcircuit.
(Q955~Q958).
Replacecapstanmotor
.
FLOW
CHARTNO.14DRUMMOTORTROUBLESHOOTING(2)
Thedrummotorrunsonlyforafewseconds.
IsdrumPGsignalgivenoutofpin
(5)ofMEconnector?
Checkdrummotor.
Checkbetweenpin(5)ofME
connec
torandallthewayupthruto
pin(66)ofIC701.
IsdrumPGsigna
lgivenoutofpin
(66)ofIC701?
IsdrumPGM.M.
signalgiventopin
(81)ofIC701?
CheckIC701.
ReadjustR724.
(HEAD
SWP
OINTcontrol)
IsH.S
W.
pulsegivenoutofpin(23)
ofIC701?
CheckIC701.
Replace
IC701.
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
FLOWC
HARTNO.15HEADSWITCHINGPULSETR
OUBLESHOOTING.
Noheadswitchingpulse.
SeeFL
OWC
HARTNO.1
3,1
4.
(DRUM
MOTOR
TROUBLESHOOTING(1),(2))
Isthedrumm
otorrotating?
IsthedrumPGsig
nalanddrumFG
signalpresentonpins(66)and(65)
ofIC701,respectively?
AretheredrumPGM.M.s
ignalatpin
(81)ofIC701?
CheckC
723andreadjustR724.
(HEADSW.
POINTcontrol.)
CouldbelinesbetweenADplug
andIC701.
Checkdrummotorandthebetween
ADtoMEharness
.
ArethedrumPGanddrumFG
signalspresenton
pins(3)and(5)of
ADconnector?
ReplaceIC701.
FLOWC
HARTNO.13DRUMMOTORTROUBLESHOOTING(1)
Thedrummotorfailstorun.
Isthevoltagemorethanabout2.6
V
DCgivenoutofpin(31)ofIC701.
CheckIC701.
NO
NO
NO
YES
YES
Checkbetweenpin(31)ofIC701
andallthewayuptopin(1)
ofME
connector.
Isthevoltagemorethanabout2.6
V
appliedatpin(1)ofMEconnector?
Isthesupplyvoltageof12Vfeedto
pin(4)ofMEconnector?
Replacedrummotor.
CheckAT12Vline.
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FLOWC
HARTNO.16DRUMSERVOTROUBLESHOOTING
Drumservodoesnot
function.
CheckperipheralcircuitofX701.
Isthere14.2
MHzoscilla
tionatpins
(37)and(38)ofIC701?
NO
InPB
mode
YES
InRECmode
IsthedrumFGsignalatpin(65)of
IC701present?
Isthereferencesigna
l(V-SYNC)
atpin(50)ofIC701?
YES
NO
NO
Checkcomposit-sync
signalline.
(C770-1,
R770)
CheckdrumFGsignalline.
Istheheadswitchingpulseatpin
(23)ofIC701present?
NO
SeeFLOWC
HARTNO.1
5.
(HEAD
SWITCHINGPULSETR
OUBLE
SHOOTING.)
YES
YES
Isthedrumerroroutputa
tpin(33)
ofIC701.
NO
ReplaceIC701.
YES
YES
Isthdrumcontrolvoltage
appliedto
pin(1)ofMEconnector?
NO
NO
NO
Ispin(31)ofIC701inhigh
impedance?
CheckharnessbetweenA
DandME.
ReplaceIC
701.
Replacedrummotor.
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1
2
FLOWC
HARTNO.17CAPSTANSERVOTROUBLESHOOTING
Capstanservodoesnotfunction.
AreRECand/or
PBmode
inoperative?
OnlyPBmodeinoperative
YES
YES
On
lyRECmodeinoperative
Checkcomposite-
Syncsignalline.
(C770-1,
R770)
DoestheV
-SYNC
signalappearat
pin(50)of
IC701?
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
ReplaceIC701.
IsthereRE
CCTL
signaloutp
utat
pins(74)a
nd(75)
ofIC701?
Doesthec
apstan
FGsignalappear
atpin(67)
of
IC701?
Isthereoscillated
14.2
MHzat
pins(38)and(37)
ofIC701?
Checkperipheral
circuitofX701.
Checkbetween
capstanFG
signal
lineandthe
AC-MCha
rness.
Isthereca
pstan
errorsigna
latpin
(34)ofIC7
01?
Doespin(32)of
IC701operate
normally?
Check
"1"
Check
"2"
Replace
IC701.
Checkcapstan
motorunitand/or
replace.
Istherecapstan
errorsignalatpin
(34)ofIC701?
DoesPBCTL
signalappearat
pin(76)ofIC701?
(TP204)
ReplaceIC701.
ReplaceAA-MH
harness
ReplaceA/Chead.
IsAA-MHharness
good?
DoesA/Chead
opratenormally?
Adjusttheheight
oftheA/Chead.
YES
YES
YES
YES
NO
NO
NO
NO
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VC-A582VC-A582VC-H982
PictureE-Edoesnotappear.
Isp
icturesignalinputintoIC201pins30and31?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
1Externalinputmode
Checktheline
betweentherearvideoinputterminal
andIC201pin
30.
2U
/Vtunermode
Checktheline
betweentheU/Vtunerpin25and
IC201pin31.
Ispic
turesignaloutputtotheIC201pin52?
IspicturesignalinputintotheIC701pin49?
IspicturesignaloutputtotheIC701pin47?
CheckthelinebetweenIC201pin5
2and
IC701pin49.
CheckthelinebetweenIC201pins63and62
andIC701p
ins56and57.
Ispicturesignaloutputtotheemitterofvideoou
tput
buffe
r(Q251)?
1L
ineoutput:C
heckQ251peripheryandoutputterminalperiphery.
2R
Foutput:Ch
eckQ251peripheryandtuner(pin6)periphery.
Is5Vapplied
totheIC201pins12,61and90?
Is5VappliedtotheIC701pin51
?
CheckthePC5Vline.
ChecktheAT5Vline.
IsserialdataclocksignalappliedtotheIC201
pins63and
62?
C
heckQ251periphery.
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C-A582UC-A582U(A)C-H982U
Picture(luminance)record
isimpossible(E-Emodeispossible).
Althoughpictu
rerecordispossible,
colordoesnotappear(E-Emodeispossible).
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Isluminancesignal(approx.
0.5
Vp-p)inputtotheIC201pin19?
Isluminancesignal(approx.
0.3
Vp-p)inputtotheIC201pin42?
Isluminancesignal(approx.
0.5
Vp-p)inputtotheIC201pin26?
Isluminancesignal(approx.
0.5
Vp-p)inputtotheIC201pin39?
Isluminancesignal(approx.
0.5
Vp-p)inputtotheIC201pin23?
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Istheluminancesignal(approx.
0.5
Vp-p)inputandoutputtotheIC201
pins13and14,
respectively?
CheckbetweentheIC201
pin18
andpin19.
(CheckC206.)
CheckbetweentheIC201
pin21
andpin42.
(CheckC208.)
Check
betweentheIC201pin60
andpin46.
(CheckC512.)
Check
betweentheIC201pin58
andpin35.
(CheckR505,
C512.)
CheckbetweentheIC201
pin39
andpin26.
(CheckC212.)
CheckbetweentheIC201
pin24
andpin23.
(CheckC210.)
Isvoltage5VappliedtotheCCD
sectionpowerterminalIC201pin36?
IsCCDcontrolvoltageapp
rox.
5V
appliednormallytothepin
37from
theIC201pin57?Isclock
signal
(approx.
7.1
6MHz/0.5
Vp-p)for
CCDappliednormallytoth
epin
44fromtheIC201pin69?
ChecktheIC201pins13and
14
peripheralcircuit.
(R201,
R20
2,
C203)
SPmode:IsrecordFMsignal(approx.20
mAp-p)outputtotheIC201pins88and89
(SP1)andpins86and87(SP2)?
EPmode:IsrecordFMsignal(approx.20
mAp-p)outputtotheIC201pins93and94
(EP1)andpins92and91(EP2)?
Checkorreplacethecylinder.
IsPRE/RECVcc5VappliedtotheIC201pin90
?
Isvoltage5Vappliedtothechroma
powerterminalIC
201pin61?
Ischromasigna
l(approx.
143
mVp-p/Burst)in
putintothe
IC201pin46?
Ischromasigna
l(approx.
180
mVp-p/Burst)in
putintothe
IC201pin58?
Check
theperipheryofIC201pin
61and
PC5Vline.
Check
whethertheIC201pins71
and73
oscillate(3.5
8MHz)?
Ischro
masignal(approx.
180
mVp-p
/Burst)outputtotheIC201
pin35?
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WC
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VC-A582VC-A582VC-H982
Playbackpicturedoesnotappear(E-Emodeispossible).
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
IsV-H.SW.P.appliedto
the
IC201pin81?
Althoughpictureisplayedback,colordoesnotappear
(E-Emodeispossible).
Isvoltage5VappliedtotheCCDsectionpowerterminalIC201pin36?
Iscontrolvo
ltageapprox.5Vappliednormallytothepin37fromtheIC201pin57?IsCCDclocksignal(approx.
7.16MHz/0.5Vp-p)appliedtothepin44fromtheIC20
1pin69?
CheckbetweentheIC201pin24andpin23.(CheckC210.)
Isluminancesignal(approx.0.5
Vp-p)inputtotheIC201pin23?
Isluminancesignal(approx.0.5
Vp-p)inputtotheIC201pin26?
Isluminancesignal(approx.0.5
Vp-p)inputtotheIC201pin42?
Isluminancesignal(approx.0.5
Vp-p)inputtotheIC201pin19?
IsFMsignal(approx.0.4Vp-p)
inputtotheIC201pin78?
Isluminancesignal(approx.0.4
Vp-p)inputtotheIC201p
in79?
Isluminancesignal(appr
ox.0.5
Vp-p)inputtotheIC201pin39?
CheckbetweentheIC201
pin39
andpin26.(CheckC212.)
CheckbetweentheIC201
pin21
andpin42.(CheckC208.)
CheckbetweentheIC201
pin18
andpin19.(CheckC206.)
Checkbetween
theIC201pin55
andpin54.(CheckC514.)
CheckbetweentheIC201
pin79
andpin78.
Istheluminancesignal(approx.0.25
Vp-p)inputandoutputtotheIC201
pins13and14and16,respectively?
Isvoltage5Vappliedtothechroma
powerterminalIC
201pin61?
Ischromasign
al(approx.403
mVp-p/Burst)inputintothe
IC201pin46?
Ischromasign
al(approx.508
mVp-p/Burst)inputintothe
IC201pin58?
Ischromasign
al(approx.286
mVp-p/Burst)inputintothe
IC201pin54?
Check
betweentheIC201pin60
andpin46.(CheckC512.)
Check
betweentheIC201pin58
andpin35.(CheckR505,C515.)
Check
theperipheryofIC201pin
61andPC5Vline.
ChecktheperipheryofIC
201pin
13and14and16.(CheckC203,
R201-2,L201,C205,R20
3.)
Check
whethertheIC201pins71
and73oscillate(3.58MHz)?
Ischromasignal(approx.508
mVp-p/Burst)outputtotheIC201
pin35
?
CheckV-H.SW.P.line.
ReplaceIC201.
ReplaceIC201.
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NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
FLOWC
HARTNO.23Hi-FiTROUBLESHOOTING
NoHi-FiE-E
soundheard.
Audiosignalinputfromtuner.
LineAudiosignalinput.
Isaudiosignal
inputtedtopins(6)
(L-CH),(44)
(R-CH)ofIC651?
Checkline
betweenMTS
decodercircuita
nd
theHi-Ficircuit.
Isaudiosignal
inputtedtopin(61)
(L-CH)and(52)
(R-CH)ofIC651?
Checklines
betweenthe
audioinput
terminalandHi-Fi
circiut.
Areserialdataandserial
clockatpins(31)and(32)of
IC651?
CheckIC651andIC701,and
allth