Lexmark E310 Service Manual - Page 42

Step 2: No Continuity

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4044-XXX FRU Model E312 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 CN502 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 CN10 on the engine board. If the problem persists, disconnect the thermistor cable from CN1o on the engine board and measure the voltage between CN10-1 and ground. The voltage measures approximately 3.9 V dc. If the voltage is incorrect, replace the engine board. 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. 2-20 Service Manual

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2-20
Service Manual
4044-XXX
Model E312
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
CN502 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
CN10 on the engine board. If the
problem persists, disconnect the
thermistor cable from CN1o on the
engine board and measure the
voltage between CN10-1 and
ground. The voltage measures
approximately 3.9 V dc. If the voltage
is incorrect, replace the engine
board. 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.
FRU
Action