Diagnostic information 2-27
4506-1xx
Fuser service check
When toner is partially fused to the paper, it is usually caused by a 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. In the Ready state (not Power Saver), the lamp will cycle on and off at approximately
15 second cycles.
You can see the light from the lamp by opening the right side cover and observing the rear
opening through which the fuser power cables pass.
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 CN403 (100/110 V ac) or CN401 (220 V ac).
Check for continuity across the fuser lamp by checking across the cable
connector pins.
• If there is continuity, turn the printer on with only the fuser power
disconnected at CN403/CN401.
Measure the voltage at connector CN102 on the LVPS/HVPS. It should
match the line voltage. If line voltage is not present, see “Main motor
service check” on page 2-28 for more information.
Make sure the fuser thermistor is correctly connected to the controller board.
If the problem persists, disconnect the thermistor cable at J2, and check for
approximately +5 V dc on pin 1. Pin 2 should be grounded. If voltage is
incorrect on pin 1, see “Controller card service check” on page 2-24 for
more information.
• If there is no continuity, replace the fuser. See “Fuser removal” on
page 4-20.
Fuser (continued)
Disconnect the thermistor cable from J2 on the controller card. Measure the
resistance across the ends of the thermistor cable. Replace the fuser assembly if
the resistance is lower than 7K ohm.
Note: Resistance measures approximately 450K ohms when cool and 1K ohms
when hot.
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