Oki 2400 manual If one of the voltages is 0, go to Power

24xx

FRU/Symptom	Action
2 Printer power	The cause of this problem may be that the
sometimes turns	power circuit is failing, or the wiring is
off.	intermittently open. Check the following in
	sequence:
	1.	Check the user’s outlet voltage and be
		sure it is within tolerance.
	2.	Check the continuity of the power cord.
	3.	Disconnect the power supply cable from
		connector CN12 on the logic board. Turn the
		printer power on and check all dc output
		voltages at CN12-1, CN12-2 and CN12-6.

Verify the following output voltages:

		CN12 - 1 (+40 V dc ±10%)
		CN12 - 2 (+40 V dc ±10%)
		CN12 - 3	(GND)
		CN12 - 4	(GND)
		CN12 - 5	(Signal GND)
		CN12 - 6	(+5 V dc ±5%)
	•	If one of the voltages is 0, go to “Power
		Service Check” on page 2-27.
	•	If the voltages are not 0 but are incorrect,
		replace the power supply unit.
3 Intermittently poor	• Remove paper jams from the paper path.
print quality.	•	Clean all feed roller surfaces.
	• Clean the ribbon shield and printhead.
	•	Clean the platen surface.
	•	Install the ribbon cartridge correctly. If the
		ribbon has reached end of life, have the user
		replace the ribbon cartridge.

Diagnostic Information 2-19