Canon LBP-1000 Service Manual page 142

CHAPTER 4
the intermediate PCB connector J1005-1 (/FANON) and J1005-3 (GND) immediate-
ly after power-ON. Replace the cooling fan, if the voltage changes from 0V to about
24V.
3. Poor contact in intermediate PCB connector
Action: Reconnect the intermediate connector J1001 and the engine controller PCB con-
nector J401 correctly.
4. Defective intermediate PCB
Action: Replace the intermediate PCB.
5. Defective engine controller PCB
Action: Replace the engine controller PCB.
VI-4. "6F-61 ERROR" (Resident ROM checksum error)
<Possible causes>
1. Defective video controller PCB
Action: Turn the power OFF and then ON again. If the problem remains after turning the
power OFF and ON, replace the video controller PCB.
VI-5. "6F-63 ERROR" (Resident DRAM error)
<Possible causes>
1. Defective video controller PCB
Action: Turn the power OFF and then ON again. If the problem remains after turning the
power OFF and ON, replace the video controller PCB.
VI-6. "6F-68 ERROR" (NVRAM (EEPROM) error)
<Possible causes>
1. Defective NVRAM (EEPROM)
Action: Perform a cold reset. If the problem remains after performing the cold reset, replace
the NVRAM (EEPROM).
2. Defective video controller PCB
Action: Replace the video controller PCB.
VI-7. "6F-7A ERROR" (SRAM in AIR chip error)
<Possible causes>
1. Defective video controller PCB
Action: Turn the power OFF and then ON again. If the problem remains after turning the
power OFF and ON, replace the video controller PCB.
VI-8. "PS OPTION ERROR"
<Possible causes>
1. Defective optional PS ROM DIMM
Action: Replace the PS ROM DIMM.
2. Defective video controller PCB
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