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

Service manual.
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922.xx—Cold fuser check
Error codes 920.xx 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: Set the Fuser Temperature to NORMAL before starting this service check. In Diagnostics mode,
select EP SETUP, and Fuser Temp.
FRU
Fuser lamp
1
AC line voltage
2
LVPS
3
LVPS
4
LVPS fuser AC cable
Fuser top cover assembly
5
(thermistor, thermistor
cable)
Fuser to system board DC
cable
Action
Remove the fuser assembly and check to make sure the correct
fuser lamp has been installed. If the correct lamp has been installed,
go to step 2.
Note: If the fuser lamp is replaced, allow the fuser assembly to cool
or a 925.xx error code could be displayed.
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 removal" on
page
4-55).
If incorrect, replace the LVPS assembly (see
supply removal" on page
CAUTION: When taking measurements for AC power, observe all
safety precautions.
Disconnect the AC line cord from the printer. Disconnect the LVPS to
fuser cable from the fuser to fuser lamp cable. Plug the AC line cord
into the printer and check the AC line voltage between the pins on
the fuser end of the LVPS to fuser AC cable. If the voltage is correct,
unplug the AC power cord from the LVPS cable and pull the LVPS
out far enough to be able to check the voltage between CN-1 and
CN-3 on the LVPS board. Plug in the power cord, turn the printer on
and check the voltage. If correct, r e place the LVPS to fuser AC cable;
if incorrect, replace the LVPS assembly. See
supply removal" on page
Note: If the fuses in the LVPS are blown, the LVPS assembly must
be replaced.
Check to make sure that the thermistor is installed correctly to J5 on
the fuser control card. If installed correctly check the cable for any
signs of damage. If any problems are found, replace the fuser top
cover
assembly."Fuser narrow media sensor removal" on
page
4-35.
If no problem is found, check the fuser to system board DC cable for
correct installation at J1 on the fuser control card. If no problem is
found, check the fuser to system board cable for correct installation
at J10 on the system board. If no problem is found, go to step 6.
"Low voltage
4-55). Disconnect the LVPS to
"Low voltage power
4-55); if correct, go to step 4.
"Low voltage power
4-55.
Diagnostic information
2-89

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