Oki C7400 Maintenance Manual page 101

1
The printer does not operate properly after power-on.
• Turn the printer off and on again.
• Is
• No Is the AC cable connected properly?
No Connect the AC cable correctly.
• Yes Is +5V output to the panel connector (OPTN connector) on the engine board (71K PWB)?
Pins 6, 7 and 14: +5V Pins 1, 3, 11 and 16: 0V
Yes Is +5V output to the panel connector on the relay board (71 PWB)?
Pin 5: +5V
No
Yes Is the operator panel cable connected properly?
No
Yes Replace the operator panel cable. Is the printer recovered from the error?
No
Yes End
• No Is +5V output to the power connector of the engine board (71K PWB)?
Pins 11, 12, 13 and 14: +5V Pins 3, 4, 5, 6, 25, 26, 27 and 28: 0V
No Replace the low voltage power unit after checking the power connector for connection.
• Yes Replace the engine board.
• Yes Are the following voltages output to the PU IF connector of the main board?
Pins 137 to 147, 187 to 197: 5V
Pins 148 and 198: +12V
Yes Replace the main board.
• No Are the following voltages output to the power connector of the engine board?
Pins 11, 12, 13 and 14:5V
Pins 7, 8, 9 and 10: +32V
Yes Replace the engine board.
• No Replace the low voltage power supply.
41316401TH Rev.9
showing on the LCD (about for one second).?
Pin 2: 0V
Replace the relay board.
Connect the cable properly.
Replace the operator panel cover Assy.
Pins 15, 15, 17 and 18: +3.3V Pin 1: +12V
Pins 3, 4, 5,6, 25, 26, 27 and 28: 0V
Pins 125 to 136, 175 to 186: +3.3V
Pins 101 to 124, 149 to 174, 199 and 200: 0V
Oki Data CONFIDENTIAL
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