Oki C9800 Series Service & Troubleshooting Manual page 101

Imaging Unit Motor Overheating Failure
Error Codes that Apply
321
Initial Troubleshooting Actions to Take
1. Ensure that the temperature and installation clearances of the printer are at specifications.
2. Clean all fan ducts.
3. Turn the printer off and allow a minimum of 30 minutes for cooling.
4. Restart the printer.
5. If the problem persists follow the procedure below.
Parts of the Printer that Apply
1. Imaging Unit Motors
2. Motor Driver Board
Troubleshooting Procedure
Steps
Test the cooling fans for proper
1
operation and adequate airflow.
Run the Motor Clutch Fan tests.
Do the fans operate correctly?
Test the Imaging Unit Motors.
2
Run the Service Diagnostics Imaging
Do the motors operate correctly?
Does this resolve the issue?
3
Action Taken
Unit Motor tests.
Yes
Go to Step 2.
Replace the Motor
Driver Board
Complete
No
Replace the defective
fan.
Replace the
defective motor
Replace the Engine
Board