Oki ES3640MFP Service & Troubleshooting Manual page 130

Fuser Unit Detected as Missing
Error Codes that Apply
320
Initial Troubleshooting Actions to Take
1. Ensure that the Fuser Latch is free of obstructions and fully engaged.
2. Cycle the printer's power.
3. If the problem persists follow the procedure below.
Parts of the Printer that Apply
1. Fuser
2. Fuser Release Sensor
3. Engine Control Board
Troubleshooting Procedure
Steps
Check the following for evidence of
1
fault or damage:
Fuser
Fuser Connector
Fuser Release Sensor
Is there any damage?
Test the Fuser Release Sensor.
2
Run the Scan Switch test
the sensor.
Does the sensor function correctly?
Check for +5 V to the sensor.
3
Is there +5 V?
Action Taken
to test
Yes
Replace any
damaged parts, and
then cycle printer
power.
Replace the Engine
Control Board
Replace the sensor
harness.
No
Replace the Fuser. If
the error persists, Go to
Step 2.
Replace the sensor. If
the error persists, go to
Step 3.