Konica Minolta bizhub C650 Technical Bulletin
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Subject:
Fusing Unit Noise Troubleshooting Guide
bizhub 552:
bizhub C452:
bizhub C552DS:
bizhub C652DS:
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 efficiently
• The non-directional nature of sound, especially in an MFP, which make it difficult 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 identified and a solution developed.
Please implement all of the solutions in the attached Troubleshooting Guide to make a significant
reduction in the amount of unwanted sound and improve the user's experience.
Audio
In several cases, audio files are available so that you can actually hear the kind of noise that results from
specific 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 modification appears in the Guide to address noise from the Fusing Drive Unit (see page 10 of the
guide).
016
bizhub 652:
101
bizhub C550:
050
bizhub C650:
050
Technical Bulletin
Solutions Support Division
016
bizhub C451:
103
bizhub C552:
087
bizhub C652:
Bulletin #: 8215
Date: 12/19/11
094
112
112
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Table of Contents
Related Manuals for Konica Minolta bizhub C650
Summary of Contents for Konica Minolta bizhub C650
- Page 1 Technical Bulletin Solutions Support Division Bulletin #: 8215 Date: 12/19/11 Subject: Fusing Unit Noise Troubleshooting Guide bizhub 552: bizhub 652: bizhub C451: bizhub C452: bizhub C550: bizhub C552: bizhub C552DS: bizhub C650: bizhub C652: bizhub C652DS: 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...
- Page 2 Page 2 of 2 Bulletin #: 8215 Model Kit Installed During Production Model Kit Installed During Production Beginning at Serial No. Beginning at Serial No. A2WV011001737 C452 A0P2011014802 A2WU011001472 C552 A0P1011009110 C451 — C652 A0P0011005305 C550 — C552DS A1DN011001580 C650 —...
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Page 3: Table Of Contents
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 Noise from Rotation Sensor 2 Noise from the Exit Roller Drive Noise from the Cleaning Roller Bushings Noise from the Paper Exit Section Modifications to the Fusing Unit Noise from the Fusing Drive Unit Noise from the Separation Claws How to Apply Drysurf To hear noise samples ...click this icon with... -
Page 4: Noise From Rotation Sensor 1
Noise from Rotation Sensor 1 C451 / C550 / C650 RETURN TO CONTENTS C452 / C552 / C652 / C552DS / C652DS SYMPTOM Squeaking or binding noise from the cam gear in the fusing unit. Refresh page to play again CAUSE This is caused by a backlash of the drive gears and the brake pad gears. -
Page 5: Noise From Rotation Sensor
Noise from Rotation Sensor 2 552 / 652 RETURN TO C451 / C550 / C650 CONTENTS C452 / C552 / C652 / C552DS / C652DS 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. -
Page 6: Noise From The Exit Roller Drive
Noise from the Exit Roller Drive RETURN TO SYMPTOM CONTENTS Unusual noise may be generated from the exit roller drive gears. C451 / C550 / C650 CAUSE The drive gear bushing is worn. Drive gears FIELD ACTION Replace the cam and the bushing. Both parts must be replaced as a set. Shaft Description Part No. -
Page 7: Noise From The Cleaning Roller Bushings
Noise from the Cleaning Roller Bushings 552 / 652 RETURN TO CONTENTS C451 / C550 / C650 C452 / C552 / C652 / C552DS / C652DS SYMPTOM A metallic creaking sound may be generated by the cleaning roller bushings. Edge of Roller bushing shaft... - Page 8 Noise from the Cleaning Roller Bushings (continued) 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. Harness Hook Hook Page 5 of 18 December 19, 2011...
- Page 9 Noise from the Cleaning Roller Bushings (continued) 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. Page 6 of 18 December 19, 2011...
- Page 10 Noise from the Cleaning Roller Bushings (continued) 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.
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Page 11: Noise From The Paper Exit Section
Noise from the Paper Exit Section 552 / 652 RETURN TO CONTENTS C451 / C550 / C650 C452 / C552 / C652 / C552DS / C652DS 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. -
Page 12: Modifications To The Fusing Unit
Modifications to the Fusing Unit RETURN TO CONTENTS 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... -
Page 13: Noise From The Fusing Drive Unit
Noise from the Fusing Drive Unit 552 / 652 RETURN TO CONTENTS C451 / C550 / C650 C452 / C552 / C652 / C552DS / C652DS SYMPTOM A squeaking noise may be generated by the fusing drive gear shaft and bushing. CAUSE The drive gear shaft is mostly D-shaped. -
Page 14: Field Action
Noise from the Fusing Drive Unit (continued) 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. - Page 15 Noise from the Fusing Drive Unit (continued) 4. Remove the side covers and the filter. 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 Page 12 of 18 December 19, 2011...
- Page 16 Noise from the Fusing Drive Unit (continued) 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.
- Page 17 Noise from the Fusing Drive Unit (continued) 10. To make the next steps easier, secure the motor unit on the frame with a screw as shown. 11. Remove 4 screws fixing the drive unit, then remove the e-ring and the gear. View from right side of machine 12. Remove the drive unit. Page 14 of 18 December 19, 2011...
- Page 18 Noise from the Fusing Drive Unit (continued) Modification 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. Page 15 of 18 December 19, 2011...
- Page 19 Noise from the Fusing Drive Unit (continued) 4. Remove the parts as shown; then, install the modified parts. 5. Reassemble the shaft with the parts in the drive unit. Page 16 of 18 December 19, 2011...
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Page 20: Noise From The Separation Claws
Noise from the Separation Claws 552 / 652 RETURN TO CONTENTS C451 / C550 / C650 C452 / C552 / C652 / C552DS / C652DS 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. -
Page 21: How To Apply Drysurf
How to Apply Drysurf 552 / 652 RETURN TO CONTENTS C451 / C550 / C650 C452 / C552 / C652 / C552DS / C652DS 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.