Purge Unit Service Check - Lexmark Jetprinter 4079-00 series Service Manual

4079-00X

Purge Unit Service Check

Symptom Explanation
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.
FRU
1 Purge Motor
2 Purge Sensor
Cable
3 • Left Connec-
tor Cable
• Logic Board
Conditions That Could Cause This
Symptom
• Purge motor
• Purge sensor cable
• Left connector card cable
• Logic board
Action
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.
Check the continuity of the purge sensor cable (pins
1 and 2 on CNPG on the left connector card)
Replace the cable if needed.
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
Adjustment Mode" on page 4-4
position adjustment, and the direction offset adjust-
ment.
"Service
and perform the print
Diagnostic Information
2-45