Konica Minolta Bizhub C650 Series Service-Handbuch

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

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