Canon LBP-1000 Service Manual page 143

Action: Replace the video controller PCB.
VI-9. "OPTION RAM ERROR"
<Possible causes>
1. Defective optional RAM DIMM
Action: Replace the RAM DIMM.
2. Defective video controller PCB
Action: Replace the video controller PCB.
VI-10. "OPTION ROM ERROR"
<Possible causes>
1. Defective option ROM DIMM
Action: Replace the ROM DIMM.
2. Defective video controller PCB
Action: Replace the video controller PCB.
VI-11. Printer does not enter READY state because "Door open status" is output when the
cover is closed.
<Possible causes>
1. Damaged cartridge door lever
Action: Replace the cartridge door.
2. Defective interlock switch
Action: Replace the interlock switch.
3. Defective engine controller PCB
Action: Replace the engine controller PCB.
VI-12. Printer does not enter READY state because "no cartridge status" is output when
cartridge is installed.
<Possible causes>
1. Poor contact in the primary bias contract on the engine controller PCB and in the cartridge
contact.
Action: Clean the contacts if dirty. If the problem remains after cleaning, or parts are
deformed or damaged, replace them.
2. Poor contact in the drum grounding contact pin of the drive unit and in the cartridge con-
tact.
Action: Clean the contacts if dirty. Replace the part (contact pin), if the problem remains
after cleaning, or it is deformed or damaged.
3. Defective cartridge
Action: Replace the cartridge.
4. Defective engine controller PCB
Action: Replace the engine controller PCB.
CHAPTER 4
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