Oki 4M - Manual (Page 78)

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1 The OKIPAGE 4w Plus/4m malfunctions after the power supply has been
turned on.
• Turn the power supply off, then on again.
• Is the LED lamp on?
• No Is the AC cable connected correctly?
• No Connect the AC cable correctly.
• Yes Is +5 V supplied between CN1 Pin 7 and CN1 Pin 13 of the high-voltage
power supply board?
(Pin 7: +5 V, Pin 13: 0 V)
• No Are the CN1 connectors of the high-voltage power supply board and
main control board connected correctly?
• No Connect the CN1 connectors correctly.
• Yes Is +5 V supplied between CN2 Pin 2 and CN2 Pin 3 of the main
control board?
(Pin 2: +5 V, Pin 3: 0 V)
• No Replace the power supply board.
• Yes Replace the main control board.
• Yes Is 1-2 V voltage supplied between CN1 Pin 2 and CN1 Pin 13 of the high-
voltage power supply board?
• No Replace the main control board.
• Yes Replace the high-voltage power supply board.
• Yes Replace the main control board.