4511-xxx
Diagnostics—all models
2-87
Fuser service check
When toner is partially fused to the paper, it is usually caused by low fuser
temperature.
Warning: Avoid handling the lamp as much as possible, as it is easily
broken. Be careful not to touch the glass housing with bare hands, because
skin acids can weaken the glass.
Note: The lamp is not a service part.
The line voltage to the printer must be within the following limits:
• 100 V ac–127 V ac for the 110 V model printer
• 200 V ac–240 V ac for the 220 V model printer
Turn the printer off, and wait a few minutes for the fuser lamp to cool. Turn
the printer on, and observe the lamp turning on during POST.
You can see the light from the lamp by opening the left side
cover and observing the upper opening through which the
fuser power cables pass.
Fuser service check
FRU Action
Fuser power cable
LVPS/HVPS
Fuser
Unplug the printer, and disconnect the fuser
lamp cable plug from the LVPS/HVPS board
connector at 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
CN102 on the LVPS/HVPS. It should match the
line voltage. If line voltage is not present, see
“LVPS/HVPS service check” on page 2-90 for
more information.
Make sure the fuser thermistor is correctly
connected to the controller board. If the problem
persists, disconnect the thermistor cable at J16,
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 2-82 for more information.
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