Oki ES3640MFP Service & Troubleshooting Manual page 97

Troubleshooting DC Power Supply
Troubleshooting Procedure
Initial Actions:
1. Perform the AC power supply troubleshooting procedure.
2. Replace the Low Voltage Power Supply (LVPS).
Troubleshooting RAM Memory Failures
Troubleshooting Procedure
Initial Actions:
Check that the RAM devices are making positive contact with their connectors.
1. Power off the printer.
2. Remove / re-install the RAM memory.
3. Replace the Ram Memory.
4. Replace the Fiery Control Board.
Paper Size Errors
Troubleshooting Procedure
Initial Actions:
The position of a multi-slotted plate, at the rear of the universal paper
tray, is set according to the position of the tray's paper guides. Upon
installation of the tray, the plate's position actuates the Paper Size
Switch. A Paper Size Mismatch error or Tray Missing error are
sometimes the result of a damaged or jammed Paper Size Switch. To
correct these types of errors, use the following procedure.
1. Remove the affected tray and examine the switch actuators for evidence
of damage or debris.
2. Check / move the tray to another location to see if the error follows.
3. Check the affected Paper Size Switch for damage or debris
4. Check the size of the loaded media.
5. Check the adjustment of the paper guides
6. Run the Switch Scan test to test the Paper Size Switches.
7. Replace the Paper Size Switch.
8. Replace the Motor Driver Board.
9. Replace the Motor Driver Board.
10. Replace the Engine Control Board.
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