Lexmark E310 Service Manual - Page 41

The fuser lamp does not light, step 2: No Continuity.

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4044-XXX The fuser lamp does not light FRU Model E310 Fuser Lamp Lamp Cable Thermistor LVPS Action Turn the printer off and disconnect the fuser lamp wires from the fuser. Check for continuity across the fuser lamp wire contacts. If there is continuity, go to step 1: Continuity. If there is no continuity, go to step 2: No Continuity. Step 1: Continuity Measure the voltage at connector CN202 on the LVPS. It should match the line voltage. If it does not, replace the LVPS. If line voltage is present, check the fuser lamp cable for continuity. Replace if defective.Make sure the fuser thermistor is correctly connected to CN1 on the LVPS. If the problem persists, disconnect the thermistor cable from CN1 on the LVPS board and measure the voltage between CN1-1 and ground. The voltage measures approximately 3.9 V dc. If the voltage is incorrect, replace the LVPS. If correct, replace the thermistor. Step 2: No Continuity Check the thermal fuse for continuity. If incorrect, replace the thermal fuse. If correct, replace the lamp. Diagnostic Information 2-19

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Diagnostic Information
2-19
4044-XXX
The fuser lamp does not light
FRU
Action
Model E310
Fuser Lamp
Lamp Cable
Thermistor
LVPS
Turn the printer off and disconnect
the fuser lamp wires from the fuser.
Check for continuity across the fuser
lamp wire contacts. If there is
continuity, go to step 1: Continuity.
If there is no continuity, go to
step 2: No Continuity.
Step 1: Continuity
Measure the voltage at connector
CN202 on the LVPS. It should match
the line voltage. If it does not,
replace the LVPS. If line voltage is
present, check the fuser lamp cable
for continuity. Replace if
defective.Make sure the fuser
thermistor is correctly connected to
CN1 on the LVPS. If the problem
persists, disconnect the thermistor
cable from CN1 on the LVPS board
and measure the voltage between
CN1-1 and ground. The voltage
measures approximately 3.9 V dc. If
the voltage is incorrect, replace the
LVPS. If correct, replace the
thermistor.
Step 2: No Continuity
Check the thermal fuse for continuity.
If incorrect, replace the thermal fuse.
If correct, replace the lamp.