Oki Data CONFIDENTIAL
42930511TH Rev. 2 187 /
(3) CU Assy Troubleshooting (1200dpi Model)
a) Nothing is displayed on the LCD
• CU PCB Malfunction
Has the power short-circuited on the CU PCB? (C450+: 5v, C50+: 3.3v) → 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 BYN PCB (optional), HMK PCB, 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_LED3-
0Red: Light OFF, FPGA_LED Green: Light ON) → If NO GOOD, remove in the
sequential order of BYN PCB (optional), HMK PCB , 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 attachment.
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