Konica Minolta bizhub C650 Series Service manual

Bulletin #: 8215
Date: 12/19/11
Subject: Fusing Unit Noise Troubleshooting Guide
bizhub 552: 016 bizhub 652: 016 bizhub C451: 094
bizhub C452: 101 bizhub C550: 103 bizhub C552: 112
bizhub C552DS: 050 bizhub C650: 087 bizhub C652: 112
bizhub C652DS: 050
Technical Bulletin
Solutions Support Division
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efciently
• Thenon-directionalnatureofsound,especiallyinanMFP,whichmakeitdifcult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 fusing
areaintheseproducts.Althoughtherearemanycauses,eachhasbeenidentiedandasolutiondeveloped.
Please implement all of the solutions in the attached Troubleshooting Guidetomakeasignicant
reduction in the amount of unwanted sound and improve the user’s experience.
Audio
Inseveralcases,audiolesareavailablesothatyoucanactuallyhearthekindofnoisethatresultsfrom
specic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modicationappearsintheGuidetoaddressnoisefromtheFusingDriveUnit(seepage10ofthe
guide).

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modicationwasdeveloped.
FOC PARTS ORDERING PROCEDURE (Fuser Kit - Technical Bulletin #8215A)
Description Qty. Part No. Notes
Fuser Kit 1U226-0950 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verication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specic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specied.Donotuseitasagenerallubricant.Applying
Drysurftoareasnotspeciedmaycausedamagetothemachine.

December 19, 2011
FUSING SECTION NOISE
TROUBLESHOOTINGGUIDE
552, 652
C451, C550, C650
C452, 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
Modications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.

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:InsufcientapplicationofDrysurfcanresultinadifferentnoise.
FIELD ACTION
If 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) A0P0R73311 Modify 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modied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

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 2
Clicking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

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

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

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

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)

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

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/plates
Upper 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

Page 9 of 18 December 19, 2011
Modications 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
OLD
STYLE
NEW
STYLE
Do NOT use any grease
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650 552 / 652

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 between
the 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
Gear
Bushing
D-shaped shaft
Pin
C452 / C552 / C652 / C552DS / C652DS
C451 / C550 / C650
552 / 652

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)

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

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)

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

Page 15 of 18 December 19, 2011
Modication 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 the
drive unit.
Noise from the Fusing Drive Unit (continued)

Page 16 of 18 December 19, 2011
4. Removethepartsasshown;then,installthemodiedparts.
5. Reassembletheshaftwiththepartsinthedriveunit.
Noise from the Fusing Drive Unit (continued)

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