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41388601TH Rev.2 107 /
1 The printer does not work normally after turned on.
• Turn off the printer, wait a few seconds, then turn it on again.
• Is displayed on the LCD (for about 1 second)?
• No Is the AC cable connected correctly?
No Connect the AC cable correctly.
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• Yes Is +5V supplied to the PANEL connector pins on the PU board (K73 PWB)?
+5V: Pin 5 0V: Pin 2
Yes Is the operator panel cable connected correctly?
No Connect the cable correctly.
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Yes Replace the operator panel cable. Recovered?
No Replace the cover assembly of the operator panel.
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Yes End
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• No Is +5V supplied on the POWER connector of the engine board (K73 PWB)?
Pin 11,12, 13, 14: +5V Pin 3, 4, 5, 6, 23, 24, 25, 26, 27, 28, 29, 30: 0V
No Check the connection of the POWER connector, or replace the low-voltage power
supply unit.
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• Yes Replace the engine board.
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• Yes Are the following voltages supplied to the PU connector of the main board?
Pin 137-147, 187-197: +5V Pin 125-136, 175-186: +3.3V
Pin 148, 198: +12V Pin 101-124, 149-174, 199, 200: 0V
Yes Is the main board assy inserted correctly?
No Insert it correctly.
Yes Replace the main board.
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• No Are the following voltages supplied on the POWER connector of the engine board?
Pin 11, 12, 13, 14: +5V Pin 15, 16, 17, 18: +3.3V
Pin 1: +12V Pin 2: -12V Pin 7, 8, 9, 10: +32V
Pin 3, 4, 5, 6, 25, 26, 27, 28: 0V
Yes Replace the engine board.
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• No Replace the low-voltage power supply unit.