Lexmark 7003-050 X340n, Service Manual

Page: 49 / 162

2-28
Service Manual
7003-XXX
Paperpath sensor service check
Printhead service check
FRU Action
All sensors
MPF sensor
Exit sensor
Paper in sensor
Controller card
Check all the sensor flags for breakage or if they are jammed.
Check all the sensors for dirt.
Check pin 1 on connector J18 for +5V and pin 2 on J18 for +3.3 V.Pin
3 should be ground.
Check pin 1 on connector J10 for +5V and pin2 on J10 for +3.3V. Pin
3 should be ground.
Check pin 1 on connector J20 for +5V and pin2 on J20 for +3.3V. Pin
3 should be ground.
If any of the readings are incorrect, replace the controller card. If they
are correct, replace the malfunctioning sensor.
FRU Action
Printhead
Unplug the MFP.
Disconnect the printhead cables from J11 and J12 on the controller
card.
Turn the MFP on.
On the controller card, 24 V dc on pin 5 at J11 and +5 V dc on
pin 7 at J12.
Verify grounds on pin 4 at J11 and on pins 2, 6, and 8 at J12.
• If voltages or grounds are incorrect, check the controller card. See
“Controller card service check” on page 2-21 for more
information.
• If voltages are correct, replace the printhead (cables are
included).