Lexmark Jetprinter 4079-00 series, Service Manual

Page: 63 / 183

Diagnostic Information
2-45
4079-00X
Purge Unit Service Check
Symptom Explanation
Conditions That Could Cause This
Symptom
You are here after using
the Head Cap Position
Service Check, or
because you suspect the
purge motor is bad and
you have no ink flow. • Purge motor
• Purge sensor cable
• Left connector card cable
• Logic board
FRU Action
1 Purge Motor Check the purge motor winding resistance. Pin 3 is
ground. Pins 4, 5, 6, and 7 are windings. The black
wire is pin 7. The resistance should be about 70 - 80
Ohms per phase. If it is not, replace the purge motor.
2 Purge Sensor
Cable Check the continuity of the purge sensor cable (pins
1 and 2 on CNPG on the left connector card)
Replace the cable if needed.
3 • Left Connec-
tor Cable
• Logic Board
Check the continuity of the left connector card cable.
Begin with the black wire on CNMEC on the logic
board and on the left connector card.
If the continuity is correct, replace the logic board. If
you replace the logic board, go to the
“Service
Adjustment Mode” on page 4-4 and perform the print
position adjustment, and the direction offset adjust-
ment.