ORDER NO.

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, JapanPIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, BelgiumPIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936 PIONEER ELECTRONIC CORPORATION 1998c

GR-408RRV2059

1. SAFETY INFORMATION ...................................... 2

2. EXPLODED VIEWS AND PARTS LIST ................ 3

3. SCHEMATIC DIAGRAM ....................................... 6

4. PCB CONNECTION DIAGRAM ............................ 8

5. PCB PARTS LIST ............................................... 10

6. ADJUSTMENT .................................................... 10

7. GENERAL INFORMATION ................................ 11

7.1 IC .................................................................. 11

8. PANEL FACILITIES AND SPECIFICATIONS .... 13

CONTENTS

T – IZK DEC. 1998 Printed in Japan

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

GRAPHIC EQUALIZER

TypeModel

Power Requirement RemarksGR-408

KUCXCN AC120V

2

GR-408

1. SAFETY INFORMATIONThis service manual is intended for qualified service technicians ; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trainedto properly and safely repair complex products such as those covered by this manual.Improperly performed repairs can adversely affect the safety and reliability of the product and mayvoid the warranty. If you are not qualified to perform the repair of this product properly and safely, youshould not risk trying to do so and refer the repair to a qualified service technician.

WARNINGThis product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to causecancer, birth defects or other reproductive harm.

Health & Safety Code Section 25249.6 – Proposition 65

NOTICE(FOR CANADIAN MODEL ONLY)Fuse symbols (fast operating fuse) and/or (slow operating fuse) on PCB indicate that replacement parts mustbe of identical designation.

REMARQUE(POUR MODÈLE CANADIEN SEULEMENT)Les symboles de fusible (fusible de type rapide) et/ou (fusible de type lent) sur CCI indiquent que les piècesde remplacement doivent avoir la même désignation.

ANY MEASUREMENTS NOT WITHIN THE LIMITSOUTLINED ABOVE ARE INDICATIVE OF A POTENTIALSHOCK HAZARD AND MUST BE CORRECTED BEFORERETURNING THE APPLIANCE TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE Many electrical and mechanical parts in the appliancehave special safety related characteristics. These areoften not evident from visual inspection nor the protectionafforded by them necessarily can be obtained by usingreplacement components rated for voltage, wattage, etc.Replacement parts which have these special safetycharacteristics are identified in this Service Manual. Electrical components having such features are identifiedby marking with a on the schematics and on the parts listin this Service Manual.The use of a substitute replacement component which doesnot have the same safety characteristics as the PIONEERrecommended replacement one, shown in the parts list inthis Service Manual, may create shock, fire, or other hazards. Product Safety is continuously under review and newinstructions are issued from time to time. For the latestinformation, always consult the current PIONEER ServiceManual. A subscription to, or additional copies of, PIONEERService Manual may be obtained at a nominal charge fromPIONEER.

1. SAFETY PRECAUTIONS The following check should be performed for thecontinued protection of the customer and servicetechnician.

LEAKAGE CURRENT CHECK Measure leakage current to a known earth ground (waterpipe, conduit, etc.) by connecting a leakage current testersuch as Simpson Model 229-2 or equivalent between theearth ground and all exposed metal parts of the appliance(input/output terminals, screwheads, metal overlays, controlshaft, etc.). Plug the AC line cord of the appliance directlyinto a 120V AC 60Hz outlet and turn the AC power switchon. Any current measured must not exceed 0.5mA.

(FOR USA MODEL ONLY)

Leakagecurrenttester

Reading shouldnot be above0.5mADevice

undertest

Test allexposed metalsurfaces

Also test withplug reversed(Using AC adapterplug as required)

Earthground

AC Leakage Test

3

GR-408

2.1 PACKING• PACKING PARTS LISTMark No. Description Part No.

2. EXPLODED VIEWS AND PARTS LISTNOTES: • Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.

• The mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation.

• Screws adjacent to mark on the product are used for disassembly.

47

5

3

2

1 1

6

8

1 Pin Plug Cords (L = 1m) PDE12482 Polyform L 14904081-0003 Polyform R 14904082-0004 Polybag 20×26 15020026-5105 Operating Instructions 15204080-0297

(English/French)

6 Carton Box 15304080-099NSP 7 Warranty Card • • • • •NSP 8 Packing Sheet • • • • •

4

GR-408

9

18

18

18

18

18

18

10

12

11

1

5

4

6

6

66

7

2

2

19

18

18

1818

181818

1818

18

1818

18

13

18

3

3

1918

1820

2018

19

19

3

3

17

6

8

14

6

6

6

13

13

13

18

18

15

16

2.2 EXTERIOR SECTION

5

GR-408

• EXTERIOR SECTION PARTS LISTMark No. Description Part No.

1 Front Cabinet 10104080-0012 EQ Bracket 12904082-0103 EQ Knob(Black) 12704082-0104 Power Button 12804080-0105 EQ On/Off Button 12804080-110

6 Post 13004082-0007 Rear Panel 18004085-101

NSP 8 Bottom Cabinet • • • • •9 Bonnet Cover 18004083-010

10 Main Bord Assy (1/4) GR408-A(EQ PCB)

11 Main Bord Assy (2/4) GR408-A(POWER PCB)

12 Main Bord Assy (3/4) GR408-A(EQ ON/OFF PCB)

13 Foot(Black)W/O H/S 13821007-010

14 Main Bord Assy (4/4) GR408-A(JACK PCB)

15 AC Cord UL 02360040-006NSP 16 Bushing • • • • •

17 Name Plate PAM1776

18 Screw BBZ30P080FZK19 Screw IBZ30P080FMC20 Screw BPZ26P080FMC

GR-408

6

A

B

C

D

1 2 3 4

1 2 3 4

3. SCHEMATIC DIAGRAM

A

3.1 MAIN BOARD ASSY

AC CORD UL02360040-006

IC1BLA6458S

INP

UT

INP

UT

B

INBUF

AM

VR KNOB LED

GRAPHICEQUALIZER

ON/OFF

POWER SUPPLY

POWER OFF/ON(LINE OUTPUT MUTE)

OFF ON

EQUALIZEROFF / ON

-29

OU

TP

UT

VC

-12

+12

0

0

0

0

+29

A MAIN BOARD ASSY (GR408-A)

2/4POWER PCBA

4/4JACK PCBA

01804083-520

AC-2

AC-1

250V/630mA

SW2 : EQUALIZER OFF/ONSW3 : POWER OFF/ON

C510.22µ/500V

R21820/1W

R22820/1W

R66.8k

GR-408

7

A

B

C

D

5 6 7 8

5 6 7 8

Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".

A

IC1BLA6458S

IC1ALA6458S

INPUT BUFFERAMP. OUTPUT

(EQUALIZER OFF)

GRAPHICEQUALIZER

GRAPHICEQUALIZER

INPUTBUFFER

AMP.

INPUTBUFFER

AMP.

GRAPHICEQUALIZER

INPUT

GR

AP

HIC

EQ

UA

LIZ

ER

INP

UT

GRAPHICEQUALIZER

INPUT

EQUALIZEROFF / ON

EQUALIZEROFF / ON

OUTPUT

GR

AP

HIC

EQ

UA

LIZ

ER

OU

TP

UT

VE

E

VC

C

GN

D

VE

E

VC

C

VEE

VCC

VCC

GN

D

GRAPHICEQUALIZER

OUTPUT

GRAPHICEQUALIZER

OUTPUT

GR

AP

HIC

EQ

UA

LIZ

ER

OU

TP

UT

GR

AP

HIC

EQ

UA

LIZ

ER

OU

TP

UT

GRAPHICEQUALIZER

OUTPUT VR1-VR14 : 01110203-230

GR

AP

HIC

EQ

UA

LIZ

ER

OU

TP

UT

0

0

0

+12

0

0

0

+12

-12

+12-12

0 0 0 0 0 0 0 0

0000 0 0 0 0 0 0

+12

-12 0 0 0 0 0 0 0 0

0000 0 0 0 0 0 0

1/4 EQ PCBA3/4 EQ ON/OFF PCBA

R366.8k

6.8k

VR8

C19

R66.8k

R76.8k

GR-408

8

A

B

C

D

1 2 3 4

1 2 3 4

4. PCB CONNECTION DIAGRAM

A

4.1 MAIN BOARD ASSY

4/4 JACK PCBA

1/4 EQ PCBA

2/4 POWER PCB NE

UT

RA

L

WHITE

LIV

E

A

SIDE A

NOTE FOR PCB DIAGRAMS :1. Part numbers in PCB diagrams match those in the schematic diagrams.2. The parts mounted on this PCB include all necessary parts for several destinations. For further information for respective destinations, be sure to check with the schematic diagram.3. View point of PCB diagrams.

CapacitorConnector

P.C.Board Chip Part

SIDE A

SIDE B

GR-408

9

A

B

C

D

5 6 7 8

5 6 7 8A

B

3/4 EQ ON/OFF PCBAIC3 IC2 IC1

POWER CORD

AC

SIDE A

MAIN BOARD ASSYA

10

GR-408

Mark No. Description Part No. Mark No. Description Part No.

LIST OF ASSEMBLIESMAIN BOARD ASSY GR408-A

NSP EQ PCB • • • • •NSP POWER PCB • • • • •NSP EQ ON/OFF PCB • • • • •NSP JACK PCB • • • • •

MAIN BOARD ASSYSEMICONDUCTORS

IC2,IC3 AUDIO IC M5229PIC1 IC LA6458SS 00206458-040LED1 LED 01912000-110

SWITCHESSW SK-22F03G5 02012205-110SW PBS-42H03-F18 02014218-110

RESISTORVR1-VR14 SLIDE VR. 01110203-230

OTHERST1 TRANSFORMER EI-35 01804083-520

Mark No. Description Part No.

5. PCB PARTS LISTNOTES:•Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List.

•The mark found on some component parts indicates the importance of the safety factor of the part.Therefore, when replacing, be sure to use parts of identical designation.

•When ordering resistors, first convert resistance values into code form as shown in the following examples. Ex.1 When there are 2 effective digits (any digit apart from 0), such as 560 ohm and 47k ohm (tolerance is shown by J=5%, and K=10%).

560 Ω → 56 × 101 → 561 ........................................................ RD1/4PU 5 6 1 J47k Ω → 47 × 103 → 473 ........................................................ RD1/4PU 4 7 3 J0.5 Ω → R50 ..................................................................................... RN2H R 5 0 K1 Ω → 1R0 ..................................................................................... RS1P 1 R 0 K

Ex.2 When there are 3 effective digits (such as in high precision metal film resistors).5.62k Ω → 562 × 101 → 5621 ...................................................... RN1/4PC 5 6 2 1 F

A

6. ADJUSTMENTThere is no information to be shown in this chapter.

11

GR-408

1IN 1

NF 1

IN 2

NF 2

IN 3

NF 3

IN 4

NF 4

IN 5

NF 5

IN 1 NF 1 IN 2 NF 2 IN 3 NF 3 IN 4 NF 4 IN 5 NF 5

–Vcc

–Vcc

GND

GND

+Vcc

+Vcc

OUTPUT

OUTPUT

NON-INVERTING INPUT

INVERTINGINPUT

INVERTING INPUT

NON-INVERTING

INPUT

NF 7

NF 7

IN 7

IN 7

NF 6

NF 6

IN 6

IN 6

10k 10k

47k

560

47k

560

47k

560

47k 47k

560

560560

47k47k47k

560

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

20 19 18 17 16 15 14 13 12 11

1 2 3 4 5 6 7 8 9 10

7. GENERAL INFORMATION

• The information shown in the list is basic information and may not correspond exactly to that shown in the schematic diagrams.

M5229P (MAIN BOARD ASSY : IC2, IC3) • Graphic Equalizer

•Pin Arrangement

7.1 IC

•Block Diagram

•Pin Function

.oN emaNniP noitcnuF .oN emaNniP noitcnuF

1 1NI

agnitcennocybretlifssapdnabehtesopmoCslanimretFNdnaslanimretNIhtiwroticapac

ebnacniagehtdna,rehtohcaeottxendetacoledils(rotsiserelbairavagnitcennocybputes

.)emulov

11 6NI agnitcennocybretlifssapdnabehtesopmoCslanimretFNdnaslanimretNIhtiwroticapac

ebnacniagehtdna,rehtohcaeottxendetacoledils(rotsiserelbairavagnitcennocybputes

.)emulov

2 1FN 21 6FN

3 2NI 31 7NI

4 2FN 41 7FN

5 3NI 51 gnitrevni-noNtupni .pmaPOtuptuorofniptupnignitrevni-noN

6 3FN 61 tupnignitrevnI .pmaPOtuptuorofniptupnignitrevnI

7 4NI 71 TUPTUO .pmaPOtuptuorofniptuptuO

8 4FN 81 ccV+ nipylppusrewopevitisoP

9 5NI 91 DNG nipdnuorG

01 5FN 02 ccV– nipylppusrewopevitageN

12

GR-408

LA6458S (MAIN BOARD ASSY : IC1) • Input Buffer Amplifier•Pin Arrangement

1

Vcc VOUT1

VOUT1

VOUT2

VOUT2

VIN-1

VIN-1

VIN+1

VIN+1

VIN+2

VIN+2

VIN-2

VIN-2

VEE

VEE

Vcc

Vcc

2 3 4 5 6 7 8 9

1,9

4

3

5

2 8

7

6

•Block Diagram

13

GR-408

8. PANEL FACILITIES AND SPECIFICATIONS• FRONT PANEL FACILITIES

Equalizer ON indicator

1 2

3

1 POWER switch (POWER OFF / ON)When this switch is set to the ON position, power is suppliedto the unit’s main circuits (Equalizer indicators lights).

NOTE:Even when performing playback without using the functionsof this component, be sure that its power switch is ON. Ifthe power switch is OFF, no sound will be produced fromthe speakers.

2 EQUALIZER button (EQUALIZER OFF / ON)When this button is pressed, the equalizer ON indicator lightsand its functions become operative. When pressed once again,this indicator go out and the unit’s functions are turned OFF,Use this button in the following manner:ON: When using the equalizer to add sound compen-

sation while performing mixing operations withprogram sources (FM broadcasts, CD play, tapeplayback, etc.).

OFF: When not using the equalizer, but playing back orrecording program sources without compensation.

3 Equalizer controlsThese are equalizer controls for the bands 60 Hz, 150 Hz,400 Hz, 1 kHz, 2.4 kHz, 6 kHz and 15 kHz.When the equalizer button has been set to ON, these controlsmay be adjusted. When a control is raised upwards from the“0” position, the frequency band corresponding to that controlwill be emphasized; when the controls is lowered, the frequencyband will be attenuated. These controls can be usedindependently for right and left channels.

NOTE:In order to protect your speakers from damage resultingfrom excessively large inputs, whenever augmenting high-frequency sound over a wide range, be sure not to raiseyour amplifier’s sound volume too high.

Left channelEqualizerindicators

Right channelEqualizerindicators

14

GR-408

+0–3

• SPECIFICATIONS

AccessoriesPin-plug cords : PDE1248 (L=1m) × 2

Input terminals (Reference input level/Input impedance) INPUT .......................................................... 150 mV/50 kΩGain............................................................................. -2 dBOutput terminals(Reference output level/Output impedance) OUTPUT ..................................................... 150 mV/3.3 kΩHarmonic distortion (20 Hz ~ 20 kHz, Output 1V).................................................................................. 0.03 %

Frequency response INPUT ................................................... 20Hz~20kHz dBEqualizer bandsCenter frequencies................................................60 Hz, 150 Hz, 400 Hz,1 kHz

2.4 kHz, 6 kHz, 15 kHzVariable range .......................................................... ±10 dBSN ratio (IHF, A network, short circuit, 1V) INPUT ......................................................................106 dB

Electrical section, miscellaneousPower requirements ................................... AC 120 V, 60 HzPower consumption.........................................................6 WExternal dimensions (W x H x D) .......... 420 x 85 x 214 mm

16-9/16 x 3-3/8 x 8-7/16 in.Weight ................................................... 2.2 kg (4 lb. 14 oz.)

AccessoriesPin-plug cords .................................................................... 2Operating Instructions ........................................................ 1

NOTE:Specifications and the design are subject to possible modifi-cations without notice, due to improvements.

Red

White

Red

White