Oki C9600 - Page 186

Oki Data CONFIDENTIAL
42930511TH Rev. 2 186 /
(2) CU Assy Troublesnhooting (600dpi Model)
a) Nothing is displayed on the LCD
• 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.
b) "Communication Error" is displayed
• 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
c) The display of “RAM Check” or “Initializing” remains displayed.
• 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.
d) Error Message Display
Following the processing procedures of the Error Message in the table attachment.