6-37
FS-1900
(2) All-black printout
Check the main charger unit
• Open the printer side cover and check that the drum unit is correctly seated. Check for poor
contact of the main charger terminal between the main charger unit and the drum unit.
Check the drum bias.
• Make sure the bias from the high voltage unit correctly arrives at the drum unit.
Check high voltage potential at the high voltage unit.
• Check the high voltage output on the high voltage unit. Replace the high voltage unit if high
voltage potential is not available on the board.
Replace the main board.
• Defective laser scanner unit control circuit in the main board (KP-948). See page 5-24.
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