24 Chapter 1 Troubleshooting control panel messages
EN
The fusing assembly contains two heating bulbs, two thermo-switches,
and two thermistors. AC power is provided to the fusing assembly via
the DC power supply, which is controlled by the DC controller PCB. The
thermistors monitor the temperature of the fusing assembly and provide
feedback to the DC controller PCB to regulate the fusing temperature.
The two thermo-switches are wired in series with the fusing bulbs. They
“open” if the temperature exceeds 240° C (464° F).
x = Description:
1 = Low temperature error
2 = Fuser warm-up service
3 = High fuser temperature
4 = Faulty fuser
5 = Fuser voltage mismatch (verify that you have NOT installed a
110V fuser in a 220V printer or vice-versa)
6 = Fuser heater cutoff
7 = Fuser motor malfunction (see recommended action for 50.7
Fuser error)
Note
A visual check to determine if the fusing assembly is functional can
be made by defeating the rear door interlock switch. To do so, press
in on the white plastic button above the left-rear corner of the fan while
turning the printer on. If the fusing bulbs and thermoswitches are
good, you should observe light from the lower fusing bulb as the
printer warms up.
1 Turn the printer off and on to reset the printer. If the error persists,
try re-installing the fusing assembly. If the error continues to persist,
proceed to step 2.
2 Turn the power off and remove the fusing assembly. Measure the
resistance between pin 3 and pin 4. The resistance should be
between 6+/-2 ohms. If there is no continuity between pins, it may be
assumed that either a heating bulb and/or a thermo-switch is “open.”
Replace the fusing assembly. If resistance limits were acceptable,
proceed to step 3.
50.x Fuser error
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