Canon LBP-860 Service Manual page 88

CHAPTER 2
b. Controller serviceman call
6F 7A SERVICE
SERVICE
i
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Description
Internal ROM checksum err"r
contents of the ROM on the video
Internal RAM error
Data cannot be correctly read from or
written to the DRAM located on the
video controller.
NVRAM errOr
correctly read from or
Data
cannot he
to the NVRAM (EEPROM) located corrected, replare the
the video controller.
Extended interface err"r
the extended interface
PCB within the prescribed time.
If the /PRNT signal is false. the /VSREQ
signal is output from the DC controller
the video controller PCB.
No /VSYNC signal
The /VSYNC signal is not oulput within
the prescribed time after the video
controller PCB receives the /VSWQ
signal from the DC controller PCB.
Data
written to the SRAM in the gate array
IOP ROM error
internal
The contents of the IOP ROM are
incorrect.
Data cannot be correctly read from or
Communication error between CPU and
The CPU cannot communicate with the
Interrupt err"r between CPU and IOP
IOP does not generate a correct
interrupt to the CPU.
Turn the power OFF and ON
again. II" the err"r persists,
replace the video controller
Turn the power OFF and ON
again. If the error persists,
replace the video controller
PCB.
Turn the power OFF and ON
again. If the error cannot be
EEPROM (IC 16).
the power OFF and ON
corrected, replace the
extended interface PCB or
Turn the power OFF and ON
again. If the error cannot be
corrected, replace the DC
controller PCB or video
controller PCB.
Turn the pow& OFF and
ON again. If the err"r
persists, replace the video
controller PCB.
OFF
again. If the error cannot be
corrected, replace the video
controller PCB.
ON agaln. If the error
cannot be corrected, replace
the video controller PCB.
Turn the power OFF and On
be corrected, replace the
video controller PCB.
Turn the power OFF and On
again. If the err"r cannot be
corrected, replace the video
controller PCB.
OFF
again. If the errOr cannot
be corrected, replace the
video controller PCB.
on