Question about Ricoh Aficio 450 Copier

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Sc 441 - Ricoh Aficio 450 Copier

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Delfor Tomás Acosta

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SC441: Development motor lock.
The development motor lock signal remains low for 2 seconds while the development motor is on.

Too much load on the drive mechanism.
Development motor defective.

Posted on Sep 17, 2009

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There is no listing for this particular code for the 450 model. Every other model that uses this code indicates the development drive train is locked up. This refers to the assembly immediately below the photoconductor unit (contains the green drum).

This can be either the motor or gear/drive train at the rear of the machine is locked up with a bad/weak motor or gear train is worn out. The other possibility would be for the development unit is seized up or nearly so. This is the more likely problem. The bushings and shafts ultimately get worn down or bound up with the toner/developer. You can try disassembly and cleaning. Just be prepared for a messy job. Be sure to save all of the developer mixture and put it all back in when you reassemble it. Otherwise, you will need to replace it with developer (not toner) and recalibrate the machine.

Posted on Sep 16, 2009

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Anonymous

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SOURCE: SC 441

Hi there the following is the description from the service manual hope this helps you Thanks J

441 PCU (CMY) motor error
The drive motor of the CMY
PCU is not locked.
• Defective gear
• Voltage between pins 2 and 14 (CN12 on engine
control board) abnormal (not +24V), or pin 12
(CN12 on engine control board) unable to send
motor clock
• Defective CMY PCU drive motor
1. Replace the CMY PCU.
2. Replace the engine control board.
3. Replace the main drive unit assembly.

I would try replacing the CMY PCU (Drums (Photo Conductor Units) first before any of the others.

Thanks J

Posted on Jan 13, 2008

Anonymous

  • 1 Answer

SOURCE: SC 441 Alert, Richo Aficio CL 3500N

I have run into this several times with these printers. In every case, it has been the CMY PCU. These run about $300.

I have read that by cleaning the PCU, you can get it to work sometimes. So far, I have not been lucky enough for it to work.

Posted on Apr 14, 2009

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Hi there the following is the description from the service manual hope this helps you Thanks J

441 PCU (CMY) motor error
The drive motor of the CMY
PCU is not locked.
• Defective gear
• Voltage between pins 2 and 14 (CN12 on engine
control board) abnormal (not +24V), or pin 12
(CN12 on engine control board) unable to send
motor clock
• Defective CMY PCU drive motor
1. Replace the CMY PCU.
2. Replace the engine control board.
3. Replace the main drive unit assembly.

I would try replacing the CMY PCU (Drums (Photo Conductor Units) first before any of the others.

Thanks J

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