Ricoh SP 1200S Service Manual Page 350

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Image Defect Troubleshooting (Defect of the Print)
M085/M086 6-48 SM
2 Faulty registration
User Check
Check that the appropriate media type is selected in the printer driver.
Possible cause and Remedy
1. Registration rear actuator catching in some position
Does the registration rear actuator move smoothly?
No: Re-assemble the registration rear actuator and ensure smooth operation.
3 Dark
User Check
1. Check the machine's environment. High temperature and high humidity conditions can
cause this problem.
2. Replace the drum unit with a new one.
3. Replace the toner cartridge with a new one.
Possible cause and Remedy
1. The developing bias voltage failure
Is the problem solved after resetting the developing bias counter?
Yes: Reset the developing bias counter. (
p.5-49 "Resetting the Developing Bias
Voltage Counter")
2. HVPS PCB failure
Is the problem solved after replacing the HVPS PCB ASSY?
Yes: Replace the HVPS PCB ASSY
3. Main PCB failure
Is the problem solved after replacing the main PCB ASSY?
Yes: Replace the main PCB ASSY.
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