Oki ES3640MFP Service & Troubleshooting Manual page 110

Fuser Fan Failure
Error Codes that Apply
127
Initial Troubleshooting Actions to Take
1. Cycle the printer's power.
2. If the problem persists follow the procedure below.
Parts of the Printer that Apply
2 Fuser Fan
3 Fuser Fan harness
4 Engine Control Board
Troubleshooting Procedure
Steps
Test the cooling fan for proper
1
operation and adequate airflow.
Run the Motor Clutch
Does the fan operate correctly?
Does this resolve the issue?
2
Action Taken
Fan test.
Yes
Replace the Engine
Control Board
Complete
No
Check the Fan connection.
Replace the Fan.