Lexmark C750 Service Manual page 77

Step Action and questions
6 Remove the ITU assembly and check that the sensor
cables are seated in the handle of the ITU assembly
correctly.
Note: The sensor connectors are located on the side of
the ITU handle assembly.
Are the cables seated correctly?
7 The front contamination shield is attached to the front
plate of the ITU frame and lies on the top of the ITU
belt.
Is the front contamination shield lying on the ITU belt?
8 Remove the ITU and check the ITU belt position. If the
belt has shifted front to rear it should be replaced. The
belt must not shift more than 4 mm in either direction.
Check by making the measurements as shown. The
lower limit is 3.1 mm, the high limit is 8.1 mm, and the
optimum position is 5.6 mm.
Has the ITU belt shifted front to rear?
9 Check to see if the ITU drive roll gear (A) is turning
during POR. Observe the gear by opening the MFP
door to its horizontal position. Observe the gear on the
left end of the ITU Drive Roll. The ITU drive roll gear
should turn for a few seconds slowly and smoothly
before the printer posts a 100 ITU error.
Does the gear turn?
Yes No
Go to step 7 Reinstall the cables
correctly. Recheck
for a 100 ITU error.
If 100 ITU is
displayed, go to
step 11.
Go to step 8 Position the shield
on top of the belt
Replace the ITU Go to step 12
assembly. See
"ITU assembly
removal" on
page 4-37
Go to step 10 Go to step 10
Diagnostic information
5060-00x
2-43