Oki ES3640MFP Service & Troubleshooting Manual page 96

5.2 General Troubleshooting
No Control Panel Display
Troubleshooting Procedure
Initial Actions:
1. Remove and reseat the Fiery Control Board.
2. Print an engine test print.
3. Replace the Fiery Control Board.
4. See "DC Power Supply Troubleshooting".
Control Panel LED is on, No Control Panel Display
Troubleshooting Procedure
Initial Actions:
1. Remove and reseat the Fiery Control Board.
2. Replace the Control Panel.
3. Replace the Fiery Control Board.
4. Replace the Control Panel harness.
Printer does not Appear to Operate at Power On.
Troubleshooting Procedure
Initial Actions:
1. Check the wall outlet for available AC voltage.
2. Cycle printer power.
3. Check the Fiery Control Board LED's for a fault indication.
4. Systematically remove all printer options to isolate a possible
problem component.
Printer Continually Displays "Warming Up" or "Initializing"
Troubleshooting Procedure
Initial Actions:
The most likely cause is that the Fiery Control Board has not
successfully loaded its NVRAM contents (instructions) into RAM. All
print engine operation halts, and will only become ready when the
Fiery Control Board successfully boots.
1. Check for media or debris in the paper path.
2. Power cycle the printer.
3. Replace the Fiery Control Board.
4. Replace the Hard Drive.
Troubleshooting AC Power Supply
Troubleshooting Procedure
Initial Actions:
1. Check the voltage at the AC wall outlet.
2. Check the power cord for defects or a loose connection.
3. Replace the Low Voltage Power Supply (LVPS).