122.01 Error Code Service Check - Lexmark C78x Service Manual

5061
Step Actions and questions
4 Check the printer is setting on a solid, flat surface.
Is the printer setting on a solid, flat surface?
5 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.
6 Remove the ITU and check the ITU belt position. If the
belt has shifted to the front or to the 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 to the front or to the rear?

122.01 error code service check

Hot fuser
Error code 122.01 indicates that the fuser heated up too quickly or not quickly enough. Error code 122.01 may
also indicate a problem in the fuser assembly with the hot roll bearings, hot roll thermistor, LVPS, or the system
board.
Step Actions and questions
1 Turn the printer on. Open the right side fuser access
door. Observe the hot roll lamp to see if it turns on and
off. You may have to observe the lamp for a few
minutes to see if it turns on and off.
Does the lamp turn on and off?
Turn the printer on. Measure the voltage on connector
2
J17-11 on the system board. The voltage should
measure approximately +0.13 V dc and +0.64 V dc as
the hot roll lamp turns on and off.
Is the voltage correct?
2-18
Service Manual
Yes No
Go to step 5 Inform the
customer that the
printer must be
setting on a solid,
flat surface.
Go to step 6 Position the
shield on top of
the belt.
Replace the ITU Treat as a belt
assembly. See stall or signal
"ITU assembly communications
removal" on problem. See
page 4-49 and "100.01 ITU
run the belt error service
tracking. See check" on
"Belt Tracking page
(ITU 4th point
adjustment)" on
page 3-13.
Yes No
Go to step 2 Replace the
LVPS assembly.
See
assembly
removal" on
page
Replace the fuser Replace the
assembly. See system board.
"Fuser See
assembly board removal"
removal" on on page
page 4-44.
2-14.
"LVPS
4-53.
"System
4-90.