Rap 09:Blank Output - OKIDATA OL400 Service Manual

RAP 09:Blank Output

START
Is the transfer wire broken?
YES Replace the transfer wire
NO Replace the high voltage power supply unit.
If the problem still exists, run the Engine Test
Are horizontal ruled lines output?
YES Replace the main controller circuit board.
NO Is the LED head connected properly? (Check for good contact.)
NO
YES
Has the trouble been removed?
YES END
NO Replace the LED head.
Has the trouble been removed?
YES END
NO Replace the image drum cartridge.
END
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(See Section 4.7 of the Service Handbook){ }.
Connect the LED head properly.
Is the image drum cartridge connected to the ground?
NO Clean the ground contact of the image drum cartridge.
YES Replace the engine controller circuit board.
Service Guide OL400
Chapter 4 Failure & Repair Analysis
Page: 83