Download - Konica C451 Fuser Unit Noise Solutions
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Bulletin #: 8215
Date: 12/19/1
ubject: Fusing Unit Noise Troubleshooting Guide
izhub 552: 016 bizhub 652: 016 bizhub C451: 094
izhub C452: 101 bizhub C550: 103 bizhub C552: 112
izhub C552DS: 050 bizhub C650: 087 bizhub C652: 112
izhub C652DS: 050
Technical BulletinSolutions Support Divisio
Noise that appears to emanate from the fusing unit can be a very elusive issue to resolve. This is a direct
result of many factors, including:
Moving parts, each of which may contribute to a noise
Tight tolerances required for the unit to operate reliably and efciently
The non-directional nature of sound, especially in an MFP, which make it difcult to identify the source of
the sound
Accuracy and thoroughness of routine maintenance, including proper cleaning and lubrication
SOLUTIONS
The attached guide represents a thorough investigation of the various sources of noise emitted by the fusingarea in these products. Although there are many causes, each has been identied and a solution developed.
Please implement all of the solutions in the attached Troubleshooting Guideto make a signicant
reduction in the amount of unwanted sound and improve the users experience.
Audio
In several cases, audio les are available so that you can actually hear the kind of noise that results from
specic areas.
If you are viewing this document on a computer, the audio samples can be accessed by clicking on the
speaker icon.
PARTS INFORMATION
A number of parts are referred to in the Troubleshooting Guide. In most cases, they have been addressed in
previous bulletins.
One new modication appears in the Guide to address noise from the Fusing Drive Unit (see page 10of the
guide).
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Page 2 of 2 Bulletin #: 8215
Model Kit Installed During Production
Beginning at Serial No.
Model Kit Installed During Production
Beginning at Serial No.
552 A2WV011001737 C452 A0P2011014802
652 A2WU011001472 C552 A0P1011009110
C451 * C652 A0P0011005305
C550 * C552DS A1DN011001580
C650 * C652DS A1DM011001407
* Production of these models ended before the modication was developed.
FOC PARTS ORDERING PROCEDURE (Fuser Kit - Technical Bulletin #8215A)
Description Qty. Part No. Notes
Fuser Kit 1 U226-0950 Contains all parts listed below
Paper exit shaft 1 1 A00J231812 For fusing drive unit
Bushing 1 A0P0232500 For fusing drive unit
Bearing 1 1 A00J232111 For fusing drive unit
Gear 33T 1 A00J230711 For fusing drive unit
Pin 1 V231201050 For fusing drive unit
Bushing 2 A0P0749500 For cleaning roller
Free-of-charge (FOC) Fuser Kit p/n U226-0950 can be ordered via the Online Technical (FOC) & Special
Program order form, located within MyKonicaMinolta.com (Service Warranty, Repair & Special Programs).
Select Technical Bulletin #8215A.
FOC parts for this program will be available for units that are within the affected serial number range as
mentioned above. These FOC parts will be available from December 19, 2011 to March 19, 2012.
Upon our receipt and verication of your online claim information, KMBS Service Operations will process a
Free-of-Charge order. All replacements will be shipped via UPS 2nd-Day service. As mentioned above, KMBS
will ship these parts at no charge; therefore, no invoice will be generated. No defective parts are to be returned
to KMBS for this specic FOC Program. Questions related to your FOC claims may be directed to KMBS
Service Operations at (201) 818-3515.
FOC PARTS ORDERING PROCEDURE (Drysurf - Technical Bulletin #8215B)
In addition to the kit above, it may be necessary to order Drysurf lubricant.
Drysurf can be ordered via the Online Technical (FOC) & Special Program order form, located within
MyKonicaMinolta.com (Service Warranty, Repair & Special Programs). Select Technical Bulletin #8215B.
Description Part No. Notes
Drysurf (lubricant) U226-0482FOC Each container services
approximately 10 fusing units
Note: Apply Drysurf only to those areas specied. Do not use it as a general lubricant. Applying
Drysurf to areas not specied may cause damage to the machine.
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December 19, 2011
FUSING SECTION NOISE
TROUBLESHOOTING GUIDE
552, 652
C451, C550, C650C452, C552, C652
C552DS, C652DS
Contents
Click a subject Page
Noise from Rotation Sensor 1 1
Noise from Rotation Sensor 2 2
Noise from the Exit Roller Drive 3
Noise from the Cleaning Roller Bushings 4
Noise from the Paper Exit Section 8
Modications to the Fusing Unit 9
Noise from the Fusing Drive Unit 10
Noise from the Separation Claws 17
How to Apply Drysurf 18
To hear noise samples
on the following pages...
...click this icon with
your mouse.
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Page 1 of 18 December 19, 2011
Noise from Rotation Sensor 1
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
SYMPTOM
Squeaking or binding noise from the cam gear in the fusing unit.
CAUSE
This is caused by a backlash of the drive gears and the brake pad gears.
COUNTERMEASURE
The drive was changed from a gear system to a belt system.
Note:Insufcient application of Drysurf can result in a different noise.
FIELD ACTIONIf the fusing unit has a gear drive, replace it with a belt drive unit.
Model Description Part No. Notes
C451, C550, C650 Fusing unit (gear drive) A00JR72122
Modify to belt drive according to
previous technical bulletin #7677.
Fusing unit (belt drive) A00JR72133
C452, C552, C652,
C552DS, C652DS
Fusing unit (gear drive) A0P0R73311Modify to belt drive according to
previous technical bulletin #7676.
Fusing unit (belt drive) A0P0R73322
RETURN TO
CONTENTS
Be sure that Drysurf has been applied thoroughly to belt-drive units,
including those modied from gear drive. Apply it with a brush or by soaking.
It the belt is not covered fully with Drysurf, the high-pitch noise can return.
Refresh page
to play again
Refresh page
to play again
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Page 2 of 18 December 19, 2011
Noise from Rotation Sensor 2
SYMPTOM 1
Squeaking from the Rotation Detection Sensor.
CAUSE
This is caused by friction between the sensor actuator and its shaft.
FIELD ACTION
Using a small brush, apply Drysurf to the shaft.
SYMPTOM 2Clicking noise from the Rotation Detection Sensor.
CAUSE
A washer was omitted while reassembling the unit during service.
FIELD ACTION
Be sure that the washer is installed to limit motion of the actuator.
RETURN TO
CONTENTS
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
552 / 652
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Page 3 of 18 December 19, 2011
Noise from the Exit Roller Drive
C451 / C550 / C650
SYMPTOM
Unusual noise may be generated from the exit roller drive gears.
CAUSE
The drive gear bushing is worn.
FIELD ACTION
Replace the cam and the bushing. Both parts
must be replaced as a set.
Description Part No.
Cam A0P0897300
Bushing A00JP89000
These parts are already installed in models
552, 652, C452, C552, C652, C552DS, and
C652DS.
FIELD ACTION
Apply Drysurf if there is any noise from this area.
RETURN TO
CONTENTS
Drive
gears
Cam
Shaft
Cam Bushing
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
552 / 652
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Page 4 of 18 December 19, 2011
Noise from the Cleaning Roller Bushings
SYMPTOM
A metallic creaking sound may be generated by the cleaning
roller bushings.
CAUSE
If a bushing becomes slightly tilted against the shaft, it can bind, creating the
noise. See the exaggerated diagram at the right.
FIELD ACTION
Replace the bushings with the new grooved style, and apply high-temperature grease to the bushings. The
grooves help to retain grease to prevent friction that can cause the bushings to tilt. Follow the instructions
below.
Description Qty. Part No.
Bushing, grooved* 2 A0P0749500
High-temperature grease(Sankol ECG25)
1 A00JPP0000
* Contained in Fuser Kit (p/n U226-0950)
Bushing Replacement Procedure
1. Remove the fusing unit front cover (3 screws).
RETURN TO
CONTENTS
Bushing
Roller
shaft
Edge of
bushing
WARNING
The fusing unit is very hot. To avoid burning
yourself, allow it to cool before proceeding.
Grooves(top and bottom)
Actual bushing color: black
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
552 / 652
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Page 5 of 18 December 19, 2011
2. Remove the rear cover (2 screws).
3. Disconnect the connector and unhook the wires
from the clamp.
4. Remove the side cover (1 screw, 2 hooks).
Be careful not to break the hooks.
Pull the wiring harness out of the cover before completely removing the cover.
Noise from the Cleaning Roller Bushings (continued)
Hook Hook
Harness
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Page 6 of 18 December 19, 2011
5. Swing the cleaning brush roller bracket upward. Hold it in
position with a piece of folded paper.
6. Replace the bushings. It is necessary to remove 1 e-clip with each bearing, and the gear and e-clip shown. Clean the shaft before installing the new bushings.
Apply high-temperature grease (Sankol ECG25) to ends of the roller shaft when installing the new
bushings.
Be careful not to let grease get on the roller surface.
7. Reassemble all removed parts.
Be sure to place the high voltage wire into the guide on
the cover.
Noise from the Cleaning Roller Bushings (continued)
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Page 7 of 18 December 19, 2011
Bushing Lubrication Procedure
Although the high-temperaure grease has been applied since the beginning of production for models 552, 652,
C452, C552, C652, C552DS, and C652DS, additional application may be needed.
Use this procedure to add lubrication when the bearings do not need to be changed.
1. Remove the front, rear, and side covers as described in the Bushing Replacement Procedure (steps 1-4)
beginning on page 4.
2. Remove the e-clips at the bushings. Slide the shaft back and forth to apply the high-temperature grease.
Be careful not to let grease get onto the roller surface.
3. Reassemble all removed parts.
Be sure to place the high voltage wire into the guide on the cover (see step 7 on page 6).
Noise from the Cleaning Roller Bushings (continued)
Apply grease between the
bushings and the roller shaft
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Page 8 of 18 December 19, 2011
Noise from the Paper Exit Section
SYMPTOM
Noise may be generated at the exit rollers and the shaft.
CAUSE
Paper dust, toner particles, and other debris have accumulated on and around the exit rollers and the shaft.
FIELD ACTION
Clean the rollers, shafts, and plates shown below.
Then apply Drysurf.
Apply Drysurf to the ends of the lower exit roller
shaft.
Apply Drysurf to the entire upper exit roller shaft.
Note: There are two obvious differences in the exit rollers for these two model groups. The changes were
made for compatibility with future models.
The color of the rollers was changed from white to black
for models 552, 652, C452, C552, C652, C552DS, and
C652DS. There was no material change other than color.
For the same models, the number of rollers was reduced
from 8 to 4.
These changes have no impact on the potential for noise.
RETURN TO
CONTENTS
Shaft
Rollers/platesUpper exit
roller assy.
Lower exit roller assy. (roller not visible)
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
552 / 652
C451 / C550 / C650
C452 / C552 / C652 / C552DS / C652DS
552 / 652
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Page 9 of 18 December 19, 2011
Modifcations to the Fusing Unit
A number of changes were made the fusing unit for these models to improve reliability and address noise
issues.
Feature Original Style New Style Reason for Change
Rotation Detection Gear drive Belt drive Noise reduction
Brush roller coupling gear Black White Wear prevention
Pressure roller drive gear Brown Black Wear prevention
RETURN TO
CONTENTS
Style Part No.
Fusing unit, OLD style A00JR72122
Fusing unit, NEW style A00JR72133
Style Part No.
Fusing unit, OLD style A0P0R73311
Fusing unit, NEW style A0P0R73322
CAUTION
Applying grease to the old style gears will
accelerate gear wear. The berglass dust from
the gears is held onto the gears by the grease,
effectively causing the gears to le themselves.
Old brush roller gear
Old pressure roller gear
New brush roller gear
New pressure roller gear
OLDSTYLE
NEWSTYLE
Do NOT use any grease
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650 552 / 652
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Page 10 of 18 December 19, 2011
Noise from the Fusing Drive Unit
SYMPTOM
A squeaking noise may be generated by the fusing drive gear shaft
and bushing.
CAUSE
The drive gear shaft is mostly D-shaped. As the shaft turns, it can scrape
the inside of the round bushing that supports it, increasing the play betweenthe shaft and the bushing and causing noise.
The shape of the shaft has been changed and the bushing material was
changed. At the same time, several other parts were changed.
Old Style Part No. Description New Style Part No. Notes
A00JR75800 Fusing drive unit (C451, C550,
C650)
A00JR75811
A0P0R73800 Fusing drive unit (552, 652, C452,
C552, C652, C552DS, C652DS)
A0P0R73811
A00J231801 Paper exit shaft 1 A00J231812 Old = long D; NEW = short D
1200312109 Bushing A0P0232500 Old = white; NEW=black
A00J232100 Bearing 1 A00J232111 Old = white; NEW=black
A00J230700 Gear 33T A00J230711 NEW has groove for pin
Pin V231201050
Fuser kit* U226-0950 Includes all parts shaded red
* All 5 parts in the kit must be installed as a set. They can modify either style fusing drive unit.
RETURN TO
CONTENTS
D-shaped shaft
GearBushing
D-shaped shaft
Pin
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
552 / 652
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Page 11 of 18 December 19, 2011
FIELD ACTION
Use these procedures to remove the fusing drive unit and install the fuser kit parts.
Fusing Drive Unit Removal Procedure
1. Remove the back covers and the white
corner covers.
2. Disconnect the cables and remove them from the clamps on the control board box.
3. Remove 5 screws that secure the
control board box; then, swing it open.
Noise from the Fusing Drive Unit (continued)
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Page 12 of 18 December 19, 2011
4. Remove the side covers and the lter.
5. Remove the air duct (1 screw); then, remove it.
6. Disconnect 3 connectors and remove 4 screws that secure the suction fan unit; then, remove it.
Noise from the Fusing Drive Unit (continued)
View from right side of machine
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Page 13 of 18 December 19, 2011
7. Disconnect 1 connector and
remove 4 screws that secure
the motor unit; then, remove it.
8. Unplug 2 connectors
and remove 3 screws
that secure the wire
guide.
9. Unplug the connectors
and remove 4 screws
securing the motor unit.
Noise from the Fusing Drive Unit (continued)
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Page 14 of 18 December 19, 2011
10. To make the next steps easier, secure the motor unit on the frame
with a screw as shown.
11. Remove 4 screws xing the drive unit, then remove the e-ring and the gear.
12. Remove the drive unit.
Noise from the Fusing Drive Unit (continued)
View from right side of machine
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Modifcation Procedure
1. Remove 3 e-rings and release the claws of the Bushing/1 of the drive unit.
Note: The actual color of Bushing/1 is BLACK, not white.
2. Slide the both bushings toward Gear 33T.
3. While tilting Shaft/1, remove its assembly from thedrive unit.
Noise from the Fusing Drive Unit (continued)
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4. Remove the parts as shown; then, install the modied parts.
5. Reassemble the shaft with the parts in the drive unit.
Noise from the Fusing Drive Unit (continued)
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Page 17 of 18 December 19, 2011
Noise from the Separation Claws
SYMPTOM
A vibrating noise may be generated involving the separation claws.
CAUSE
The tips of the separations claw interfere with the surface of the fusing roller. As a permanent correction, the
shape of the claw shaft hole has been changed.
FIELD ACTION
Using the worm screw, adjust the gap between the
separation claws and the fusing roller until the noise
disappears.
Check to be sure that the adjustment does not permit
paper jamming.
RETURN TO
CONTENTS
Holder
Worm screw
Claw
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
552 / 652
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How to Apply Drysurf
FIELD ACTION
Drysurf must be applied properly in order to effective. It will have little effect if it is simply applied like a viscous
lubricant such as oil or grease.
Shake well before use so that the liquid suspension is well
mixed.
Drysurf may be applied with a small brush. Be sure to
apply it evenly.
Dipping the timing belt is the easiest way to coat the entire
surface with Drysurf. The belt can be dipped in the Drysurf
bottle a little at a time, or the entire belt can be coated by
placing it and the Drysurf in a zipper-top bag.
Be sure to let parts dry completely before reassembling
them.
RETURN TO
CONTENTS
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
552 / 652