Error Code - Lexmark C750 Service Manual

5060-00x

122 Error code

The printer has detected a problem in the fuser hot roll lamp circuitry, backup roll fuser circuitry, fuser hot roll
thermistor, backup roll thermistor, engine board, or LVPS fuser control circuits.
Replace the FRUs in the order shown:
1.
Fuser assembly. See
2.
LVPS assembly. See
3.
Engine board. See
123 Error code
Cold fuser
The printer has detected a problem in the fuser hot roll lamp circuits, backup roll fuser lamp circuits, fuser hot roll
thermistor, backup roll thermistor, engine board, or LVPS fuser control circuits.
Replace the FRUs in the order shown:
1.
Fuser assembly. See
2.
LVPS assembly. See
3.
Engine board. See
124 Error code
Hot fuser
The printer detects a problem with the fuser running over temperature or the hot roll fuser lamp has been on too
long. A problem may exist in the fuser assembly with the hot roll bearings, the hot roll thermistor, or other hot roll
parts. The LVPS or engine board assembly can also be failing.
Step Action and questions
1 Open the right fuser access door. Observe the fuser
and see if the hot roll lamp turns on and off. You may
have to observe the fuser for a few minutes.
Does the hot roll lamp turn off and on?
2 Turn the printer on and measure the voltage on
connector J10-11 on the engine 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?
2-46
Service Manual
"Fuser assembly removal" on page
"Low voltage power supply (LVPS) removal" on page
"Engine board removal" on page
"Fuser assembly removal" on page
"Low voltage power supply (LVPS) removal" on page
"Engine board removal" on page
4-31.
4-38.
4-29.
4-31.
4-38.
4-29.
Yes
Go to step 2
Replace the fuser
assembly. See
"Fuser assembly
removal" on
page 4-31.
No
Replace the LVPS
assembly. See
"Low voltage
power supply
(LVPS) removal"
on page 4-38.
Replace the engine
board assembly.
See "Engine
board removal"
on page 4-29.