Lexmark 2591+ - Intermittent Problem Service Check

Diagnostic information 2-11
2580+, 2581+, 2590+, 2591+
Go Back
Previous
Next
Intermittent problem service check
4 Logic board If all parts appear okay but the Home Position Error still occurs, replace the logic
board.
After replacing the logic board or any parts affecting the carrier, perform the
bidirectional print adjustment. See “Bidirectional print adjustment” on
page 4-3.
Step FRU Action
1 The printer sometimes
fails before POST is
complete.
Check for the following:
1. Loose connectors. Reconnect all connectors to the logic board.
2. Electrical noise or static discharge.
Check the following:
• Power supply ground
• Printer frame ground
• Printer interface cable is grounded and shielded.
3. Intermittently low voltages.
Check for ac and all dc voltages and short circuits on the logic board.
a. Check the user’s outlet voltage, and ensure that it is within tolerance.
b. Check the continuity of the power cord.
c. Disconnect the power supply cable from connector J15 on the logic board.
Turn the printer power on, and check all dc output voltages at J15-1, J15-2,
and J15-6.
Verify the following output voltages:
- J15 - 1 (+40 V dc ±10%)
- J15 - 2 (+40 V dc ±10%)
- J15 - 3 (GND)
- J15 - 4 (GND)
- J15 - 5 (Signal GND)
- J15 - 6 (+5 V dc ±5%)
- J15 - 7 (Power Save Mode)
• If the voltages are incorrect, replace the power supply.
• If the failure remains, replace the logic board.
Note: When replacing the logic board, always reset the bidirectional print
adjustment. See “Bidirectional print adjustment” on page 4-3.
Step FRU Action
CAUTION
Always unplug the power cord before doing any continuity measurement.