Troubleshooting Guide
• Remove the NVRAM from the original engine control board and install it on the new one when you
replace the engine control board.
Blank Print
Symptom Possible cause Necessary actions
No image is printed.
Defective LDU Replace the LDU.
Defective PCU Replace the PCU.
Defective transfer belt unit Replace the transfer belt unit.
Incorrect action of transfer roller
Check the guide and the transfer
roller.
Defective high voltage supply
board
Replace high voltage supply
board 1 or 2.
Defective engine board (EGB) Replace the engine board (EGB).
All-black Print
Symptom Possible cause Necessary actions
All the paper is black.
Incorrectly installed PCU Install the PCU correctly.
Defective PCU Replace the PCU.
Defective high voltage supply
board
Replace high voltage supply
board 1 or 2.
Defective LDU Replace the LDU.
Defective engine board (EGB) Replace the engine board (EGB).
Defective main board Replace the main board.
4. Troubleshooting
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