Lexmark Forms Printer 2400 Service Manual page 37

24xx
FRU/Symptom
2 Printer power
sometimes turns
off.
3 Intermittently poor
print quality.
Action
The cause of this problem may be that the
power circuit is failing, or the wiring is
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
Service Check" on page
• If the voltages are not 0 but are incorrect,
replace the power supply unit.
• Remove paper jams from the paper path.
• 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.
2-27.
Diagnostic Information
"Power
2-19