Oki C9850

Oki Data CONFIDENTIAL
43627911TH Rev. 3
191 /
(2) CU Assy Troubleshooting (1200dpi Model)
a) Nothing is displayed on the LCD
• CU PCB Malfunction
Has the power short-circuited on the CU PCB? (C7099: +5v)/ Does the LED
lightup normally? (PWR_GOOD Green: Light ON, IAG_LED3-0 Red: Light
OFF, FPGA_LED Green: Light ON)
If NO GOOD, check to see if the
RAM DIMM is normally inserted.
• Others
Power, Operation Panel, Fuse, etc.
b) "
Communication Error" is displayed
• CU PCB Malfunction
Does the LED lightup normally? (PWR_GOOD Green: Light ON, DIAG_LED3-0
Red: Light OFF, FPGA_LED Green: Light ON)
If NO GOOD, remove in
the sequential order of BY3 PCB (optional), RAM_DIMM, and HDD. Does the
Light On state vary?
If the LED Light On state is Normal, replace the applicable part.
If light ON is not normal, then replace PCB.
c) "Initializing" remains displayed.
• CU PCB Malfunction
Does the LED lightup normally? (PWR_GOOD Green: Light ON, DIAG_LED
3-0Red: Light OFF, FPGA_LED Green: Light ON)
If NO GOOD, remove in
the sequential order of BY3 PCB (optional), RAM_DIMM, and HDD. Does the
Light On state vary?
If the LED Light On state is Normal, replace the applicable part.
If light ON is not normal, then replace PCB.
d) Error Message Display
Following the processing procedures of the Error Message in the table attach-
ment.