Error (111/112) Fuser, Warm-Up/Temperature Low - Lexmark Optra C Service Manual

Error (111/112) Fuser, Warm-Up/Temperature Low

FRU
1 Poor
connection
2 Thermistor/
wiring
3 Fuser upper
heater/
thermoswitch
4 Fuser lower
heater/
thermoswitch
5 Thermistor
mounting
6 Thermistor
soiled
7 Power supply
unit (low
voltage)
DC controller
PCB/
Mechanical
controller PCB
Action
Check the connections of DC controller PCB
connector J112 and mechanical controller PCB
connector J2007.
Turn the power switch OFF, remove the fuser unit,
and measure the resistance between fuser unit
connectors J21-5 and J21-6, see "Fuser Connector
(J21)" on page 5-39. Is it between 180 Ohms and
280 Ohms (normal temperature)? Check the wiring
between DC controller connector J112 and the
thermistor, and if it is normal, replace the thermistor.
Is there continuity between fuser unit connectors
Thermoswitch J21-1 and J21-2 when the fuser unit
is removed? See "Fuser Connector (J21)" on page
5-39. Check the continuity of both the fuser upper
heater and the thermoswitch, and replace defective
parts.
Is there continuity between fuser unit connectors
Thermoswitch J21-3 and J21-4 when the fuser unit
is removed? See "Fuser Connector (J21)" on page
5-39. Check the continuity of both the fuser lower
heater and the thermoswitch, and replace defective
parts.
Is the thermistor uniformly connected to the fuser
lower roller?
Is the thermistor surface contacting the fuser roller
soiled? Clean it.
Replace the power supply unit. If the problem
remains, replace and check as follows:
1. DC controller PCB, see "DC Controller Board
Information" on page 2-2.
2. Mechanical controller PCB.
Reconnect them.
Diagnostic Information 2-15