Error Code Service Check - Lexmark C77x Service Manual

122.02 error code service check

Hot fuser
Error code 122.02 displays whenever the printer detects a problem with the fuser running over temperature or
the fuser lamps have been on too long. A problem could exist in the fuser assembly with the hot roll bearings,
hot roll thermistor, or other hot roll parts. The LVPS or system board assembly can also be failing.
Step Actions and questions
1 Open the right fuser access door. Observe the fuser,
and see if the hot roll fuser lamp turns on and off. You
may have to observe for a few minutes.
Do the lamps turn off and on?
2
Turn the printer on, and measure the voltage on
connector J17-11 on the system board. The voltage
should measure approximately +0.13 V dc to
+0.64 V dc as the hot roll lamp turns on and off.
Is the voltage correct?
122.03 error code service check
Hot roll thermistor circuit is open
If error code 122.03 displays, the printer detects a problem in the fuser hot roll, fuser hot roll thermistor, system
board, or LVPS fuser control circuits.
Step Actions and questions
1 Turn the printer on, and allow it to reach the Ready
prompt.
Note: The printer may not complete POR and post a
122.03 Error message.
Measure the voltage on connector J17-6 on the system
board. The voltage should measure approximately
+3.3 V dc.
Is the voltage correct?
2 Measure the voltage on the fuser DC control connector
on the LVPS. Measure the voltage on pin 6 of the
connector.
Does the voltage measure approximately +3.3 V dc?
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.
Yes No
Go to step 2 Replace the
system board.
See
board removal"
on page
Replace the fuser Replace the
assembly. See LVPS assembly.
"Fuser See
assembly assembly
removal" on removal" on
page 4-44. page
Diagnostic information
5061
"LVPS
4-53.
"System
4-89.
"System
4-89.
"LVPS
4-53.
2-19