Autocompensator Service Check - Lexmark C750 Service Manual

5060-00x
Step Actions and questions
4 Unplug all cables from the system board, except J6,
J35, J37. See
page 5-6
Does the printer power up and display a message?
5 Turn off the printer and plug in the cable for the
component that is related to the error presented. For
example, for the 114 Service Printhead error, plug in
the black printhead J11 and J12. Use connector
locations on
page 5-6
Repeat this step until the original DC power problem
occurs.
Does the DC power problem occur?

Autocompensator service check

•
If the paper fails to feed from Tray 1 or 500-sheet option, go to
•
If the autocompensator fails to lower when Tray 1 is installed, go to
•
If the autocompensator fails to retract when you attempt to remove Tray 1, go to
•
If there is no indication that the media is out or low, go to
•
If the printer fails to detect transparencies and 203 Paper Jam appears, go to
Note: When feeding paper through the printer to check for autocompensator problems, use the Tray 1 Feed test
in the Diagnostics Menu. A printed copy is not required.
Step A
Step Action and questions
1 Use the tray 1 feed test to feed paper from tray 1.
Check to see if the pick rolls are turning.
Note: Observe the pick rolls by opening the Lower Jam
access door assembly.
Do the pick rolls turn?
2 Check the autocompensator pick rolls for
contamination or damage to the rolls.
Is there any excessive contamination or damage to the
pick rolls?
3 Verify that the autocompensator is not stuck in the up
position. Verify that the output clutch assembly is not
damaged.
Is the autocompensator stuck in the up position or the
output clutch damaged?
4 Check the voltages at J73 on the engine board.
Are the voltages correct?
2-114
Service Manual
"System board - non-network" on
or "System board - network" on page
"System board - non-network" on
or "System board - network" on page
Yes
Go to step 5
5-7.
Check the cable
and component
that was last
connected to
system board for a
5-7. problem such as a
short.
"Step A" on page
"Step B" on page
"Step C" on page
"Step D" on page 2-116.
"Step E" on page
Yes
Go to step 2
Replace the pick
rolls. Always
replace both pick
rolls at the same
time.
Dislodge the
autocompensator.
If this does not fix
the problem, go to
step 4.
Replace the
autocompensator
assembly. See
"Autocompensat
or pick assembly
removal" on
page 4-17.
No
Replace the
"System board"
on page 4-67.
If printer comes to
Ready, connect the
remaining cables
and print.
2-114.
2-115.
2-115.
2-116.
No
Go to step 3
Go to step 3
Replace the engine
board. See
"Engine board
removal" on
page 4-29.
Replace the engine
board. See
"Engine board
removal" on
page 4-29.