Second Transfer Roll Service Check - Lexmark C750 Service Manual

5060-00x

Second transfer roll service check

Note: The second transfer roll is 51.03 mm (2.009 inches) in circumference. Any print quality problems such as
lines that are spaced apart indicate you should check the second transfer roll for damage, toner, or foreign
material.
Note: The second transfer roll is also part of the maintenance kit and should be replaced
Maintenance" message appears. Ask the customer if they have replaced the second transfer roll recently.
Note: If any of the following problems occur, go to
•
A problem with only one color
•
Light or very light print
CAUTION: Make sure the printer is powered off before making any checks on the second transfer roll or
associated parts for personal safety and to prevent damage to the printer.
Step Actions and questions
1 Second transfer roll assembly—check the second
transfer roll for any signs of toner buildup, surface
damage to the roll, oil, or other contaminants on the
surface of the roll.
Do you see any problems with the second transfer roll?
2 Transfer arms, springs, and associated hardware—call
your next level of support. None of these parts are
service related parts.
Is there any problem with the associated hardware?
3 Transfer high voltage power supply, HV wiring and
contacts—check the second transfer cable (transfer
HVPS contact I to the second transfer roll rear arm
contact) for correct installation.
Is the cable installed correctly?
4 Check the continuity of the second transfer cable.
Is there continuity?
5 Make sure the ITU Bias Spring is not broken or missing
for the color(s) that is having Transfer problems.
Is the ITU Bias Spring broken, off, or missing?
6 Check the transfer HVPS to ITU HV transfer terminal
for the color(s) that is having transfer problems.
Is the cable disconnected or broken?
2-148
Service Manual
"Print quality service checks" on page
Yes
Replace the
second transfer
roll. See "Second
transfer roll
removal" on
page 4-79
Call your next level
support
Go to step 4
Replace the FRUs
in order:
1. Second transfer
roll. See
"Second
transfer roll
removal" on
page 4-79
2. Transfer HVPS
board. See
"Transfer
HVPS board
removal" on
page
this does not
correct the
problem, go to
step 5.
Repair as
necessary
Reinstall or replace
the cable
when a "83 ITU
2-136:
No
Go to step 2
Go to step 3
Install the cable
correctly
Replace the
second transfer
cable
4-80. If
Go to step 6
Go to step 7