Ricoh SP 8400DN Field Service Manual page 1258

Ricoh a3 size black and white laser printer.

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6.Troubleshooting

Drum Motor Lock

Lock signals are observed at 2 sec intervals during motor ON, and a High level is detected

at least 20 times.

Error Name/Error Condition/Major Cause/Solution

Cycle the main power off/on

Replace the harness between the BCU and HVPS.

Reconnect or replace the harness between the BCU and HVPS.

Reinstall or replace the development unit.

Check if the contact and separation movement of the transfer unit works correctly.

Replace the HVPS.

Replace the BCU.

Error Name/Error Condition/Major Cause/Solution

Motor defective

Connector disconnected

Harness broken

BCU defective

PCU torque increased

Reconnect the connector.

Replace the harness of the drum/waste toner motor.

Replace the drum/waste toner motor.

Replace the PCDU.

Replace the BCU.

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