Lexmark T420 Service Manual page 75

4048–00x
FRU
Front Cover
Operator Panel Cable
RIP Card Assembly
Action
If all lights are dim and operate
erratically during POST or come on
and stay on solid during POST,
replace the following FRUs one at a
time in the order shown:
• RIP card assembly
• Front cover
• Operator panel cable
Note: Always check printhead
alignment after replacing the RIP
card assembly. See
Assembly Adjustment" on
page 4-2 for hardware alignment
of the printhead.
If none of the lights come on, make
sure the cable is properly connected
to the operator panel and the RIP
card assembly. Check the LVPS.
Disconnect the cable and check it for
continuity. Replace if necessary.
If the cable indicates continuity,
verify +5 V dc at pin #5 on J7. See
"Locations" on page 5-1
information.
• If the voltages are not correct,
replace the RIP card assembly.
• If these voltages are correct,
replace the front cover.
Diagnostic Information
"Printhead
for more
2-39