Konica C451 Fuser Unit Noise Solutions

7/24/2019 Konica C451 Fuser Unit Noise Solutions

1/21

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.


4/21

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


5/21


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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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


7/21


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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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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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.



10/21


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).


Apply grease between the

bushings and the roller shaft


11/21


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


12/21


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


13/21


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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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)


15/21


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.


View from right side of machine


16/21


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.



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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.


View from right side of machine


18/21


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.



19/21


4. Remove the parts as shown; then, install the modied parts.

5. Reassemble the shaft with the parts in the drive unit.



20/21


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


21/21

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

Documents

Konica C451 Fuser Unit Noise Solutions