Lexmark 7003-050 X340n, Service Manual

Page: 48 / 162

Diagnostic information
2-27
7003-XXX
Operator panel service check
Inspect the operator panel cable for damage. Make sure the cable is plugged in securely.
POR the MFP, and check each light for proper operation.
Operator panel service check
FRU Action
Operator panel
Controller card
Buttons
Check connector J5, pin 5 for 3.3 V.
If the voltage is present, replace the
operator panel. If the voltage is not
present, replace the controller card.
Lights
If the lights don’t illuminate, make
sure the cable is properly connected
to the controller card and the
operator panel. Ensure the controller
card has input voltage to it.
24 V dc on cable pins 9 and
10 at J7.
• Check for +5 V dc at J5, pin 14.
See “Controller card service
check” on page 2-21 or page 4
for more information.
• If these voltages are not correct,
replace the controller card.
• If these voltages are correct,
replace the operator panel.
If more than one light does not turn
on or an individual light stays on
solid during POST, replace the
operator panel.
If all lights are dim and operate
erratically during POST or all lights
come on and stay on solid during
POST, replace the FRUs in the
following order one at a time:
• Controller card
• Operator panel
manuals4u.com manuals4u.com