Oki C9850 Maintenance Manual page 191

(2) CU Assy Troubleshooting (1200dpi Model)
a) Nothing is displayed on the LCD
•
•
Power, Operation Panel, Fuse, etc.
b) "Communication Error" is displayed
•
c) "Initializing" remains displayed.
•
d) Error Message Display
Following the processing procedures of the Error Message in the table attach-
ment.
43627911TH Rev. 3
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)
RAM DIMM is normally inserted.
Others
CU PCB Malfunction
Does the LED lightup normally? (PWR_GOOD Green: Light ON, DIAG_LED3-0
Red: Light OFF, FPGA_LED Green: Light ON)
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.
CU PCB Malfunction
Does the LED lightup normally? (PWR_GOOD Green: Light ON, DIAG_LED
3-0Red: Light OFF, FPGA_LED Green: Light ON)
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.
Oki Data CONFIDENTIAL
If NO GOOD, check to see if the
If NO GOOD, remove in
If NO GOOD, remove in
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