Lexmark E330 Service Manual - Page 82

Action, Step 1: Continuity, Step 2: No continuity

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4505 Fuser service check (continued) FRU Lamp cable LVPS/HVPS Fuser Action Unplug the printer and disconnect the fuser lamp cable plug from the LVPS/HVPS board connector CN102. Check for continuity across the fuser lamp by checking across the connector pins. • If there is continuity, go to Step 1: Continuity. • If there is no continuity, go to Step 2: No continuity. Step 1: Continuity Turn the printer on with only the fuser power disconnected. Measure the voltage at connector CN2 on the LVPS/HVPS. It should match the line voltage. • If line voltage is not present, see "LVPS/HVPS service check" on page 2-57 for more information. Make sure the fuser thermistor is correctly connected to the controller board. If the problem persists, disconnect the thermistor cable at J15 and check for less than +5 V dc on pin 1. Pin 2 should be ground. • If line voltage is incorrect on pin 1, see "Controller card service check" on page 2-49 for more information. Step 2: No continuity Check the lamp cable for continuity. • If correct, replace the fuser. • If incorrect, replace the lamp cable. 2-54 Service Manual

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2-54
Service Manual
4505
Fuser service check (continued)
FRU
Action
Lamp cable
LVPS/HVPS
Fuser
Unplug the printer and disconnect
the fuser lamp cable plug from the
LVPS/HVPS board connector
CN102.
Check for continuity across the fuser
lamp by checking across the
connector pins.
•
If there is continuity, go to Step 1:
Continuity.
•
If there is no continuity, go to
Step 2: No continuity.
Step 1: Continuity
Turn the printer on with only the
fuser power disconnected.
Measure the voltage at connector
CN2 on the LVPS/HVPS. It should
match the line voltage.
•
If line voltage is not present, see
“LVPS/HVPS service check” on
page 2-57
for more information.
Make sure the fuser thermistor is
correctly connected to the controller
board. If the problem persists,
disconnect the thermistor cable at
J15 and check for less than +5 V dc
on pin 1. Pin 2 should be ground.
•
If line voltage is incorrect on pin 1,
see
“Controller card service
check” on page 2-49
for more
information.
Step 2: No continuity
Check the lamp cable for continuity.
•
If correct, replace the fuser.
•
If incorrect, replace the lamp
cable.