Fuser Service Checks; 920.Xx-Cold Fuser Service Check - Lexmark X642e Service Manual

7002-xxx

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 product where you are working.
Unplug the product before you begin, or use caution if the product 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
1 Fuser lamp
Fuser lamp AC cable
2 AC line voltage
3 LVPS
2-132
Service Manual
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
page 4-79.
• 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
supply removal" on page
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
4-128.
"Fuser assembly removal" on
"Low voltage power
4-109). Disconnect the LVPS to fuser AC
"Low voltage power
4-109); if correct, go to step 4.
5-11).