Oki C9600 Service Manual page 186

(2) CU Assy Troublesnhooting (600dpi Model)
a) Nothing is displayed on the LCD
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b) "Communication Error" is displayed
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c) The display of "RAM Check" or "Initializing" remains displayed.
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d) Error Message Display
Following the processing procedures of the Error Message in the table attachment.
42930511TH Rev. 2
CU PCB Malfunction
Has the power short-circuited on the CU PCB? (CP14+: 5v, CP16+: 3.3v) → If
NO GOOD, Check insertion of ROM/RAM DIMM
Others
Power, Operation Panel, Fuse, etc.
CU PCB Malfunction
Does it operate when the RAM DIM and HDD are removed?
Is there any skewed insertion or half-insertion states? → Re-insert the RAM DIM
and HDD.
Replace CU PCB
CU PCB Malfunction
Does it operate when the RAM DIM and HDD are removed?
Is there any skewed insertion or half-insertion states? → Re-insert the RAM DIM
and HDD.
Replace CU PCB
LAN Card PCB Malfunction
Replace the LAN card (HMK board), and check whether it operates properly. If
not, replace the CU board or check the adjustment of the surface-mounted
devices on the board.
Oki Data CONFIDENTIAL
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