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Fuser Service Checks; 920.xx-cold Fuser Service Check - Dell 5310n - Workgroup Laser Printer B/W Service Manual

Service manual.
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Fuser service checks

920.xx—Cold fuser service check
Error codes 920.x and 922.xx may display for a cold fuser failure.
Some 920.xx error codes may be cleared by turning the printer on and off and allowing it to complete POR.
CAUTION: There is a danger from hazardous voltage in the area of the printer where you are
working. Unplug the printer before you begin, or use caution if the printer must receive power in
order to perform the task.
Service tip: Some 920.xx errors can be caused by multiple sheets of paper being fed up to the fuser.
Service tip: Set the Fuser Temperature to NORMAL before starting this service check. In Diagnostics mode,
select EP SETUP, and Fuser Temp.
Service tip: It may take several minutes for the error codes 920.xx and 922.xx to be displayed after the printer is
turned on.
FRU
Fuser lamp
1
Fuser lamp AC cable
AC line voltage
2
LVPS
3
Fuser lamp
4
Fuser top cover assembly
Fuser connect cable (fuser
to fuser lamp cable)
Action
Observe the lamp through the left near side of the printer. It may be
necessary to remove the redrive assembly to observe the lamp
turning on and off. If the lamp does not come on do the following:
• If not previously removed, remove the redrive assembly. See
"Redrive assembly removal" on page
• Remove the fuser assembly. See
on page
4-27.
• Make sure the correct type of lamp is installed (voltage and
wattage).
• Verify that the fuser to fuser lamp cable is installed correctly to
the fuser top cover assembly. If incorrect, install correctly; if
correct, go to step 2.
CAUTION: When taking measurements for AC power, observe all
safety precautions.
Check the AC line voltage to make sure it is within operating
specification. If incorrect, inform the customer; if correct, go to step 3.
CAUTION: When taking measurements for AC power, observe all
safety precautions.
Unplug the AC line cord from the printer and pull the LVPS out far
enough to access CN1 on the LVPS board (see
power supply removal" on page
fuser AC cable, plug in the line cord, turn the printer on and measure
the voltage between CN1-1 and CN1-3 on the connector (see the
connector locations at
"Low voltage power supply" on page
If incorrect, replace the LVPS assembly (see
supply removal" on page
Check continuity of the fuser to fuser AC cable, fuser top cover
assembly, and fuser lamp by checking the continuity between the two
pins on the fuser lamp AC cable connector:
• If there is continuity, go to step 5.
• If there is no continuity, check the continuity of the fuser to fuser
lamp AC cable. If incorrect, replace the lamp, if incorrect, replace
the fuser top cover assembly.
Note: If the fuser lamp is replaced, allow the fuser assembly to cool
or a 925.xx error may be displayed.
4-75.
"Fuser assembly removal"
"Low voltage
4-55). Disconnect the LVPS to
"Low voltage power
4-55); if correct, go to step 4.
Diagnostic information
5-10).
2-87

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