Oki ES3640MFP Service & Troubleshooting Manual page 119

Control Panel Communication Failure
Error Codes that Apply
050 and 187
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
1. Control Panel
2. Control Panel Interface Cable
3. Engine Control Board
Troubleshooting Procedure
Steps
Check the Control Panel connection.
1
Is the Control Panel Harness
connected to the Engine Control
2
Check all pins on the Control Panel
Disconnect the harness from the
Engine Control Board and Control
Is the harness conductive?
Action Taken
Board?
Harness for continuity.
Panel connectors.
Yes
Go to Step 2.
Replace the Engine
Control Board
If the error persists,
replace the Control
Panel
No
Connect the Control
Panel harness,
Replace the harness.