Fuser Solenoid Service Check - Lexmark 20G0482 - T 644tn B/W Laser Printer Service Manual

4061-xx0

Fuser solenoid service check

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: Try changing the envelope enhance level setting. A different setting may correct the problem.
Note: Check the fuser envelope conditioner solenoid adjustment as described in the adjustment section
solenoid adjustment" on page
FRU
1 Fuser envelope conditioner
solenoid
System board
2
3
LVPS
4 Fuser board to system
board cable
5 Fuser assembly
2-94
Service Manual
4-2.
Action
Observe the operation of the fuser solenoid by removing the redrive
assembly. Check for proper mechanical operation of the solenoid and
associated hardware, link, and so on. If correct, check the resistance
of the solenoid between J4-1 and J4-2 on the fuser control board.
1
J2
1
The resistance measures between 5 ohms and 10 ohms. If incorrect,
replace the fuser assembly. If correct, go to step 2.
Measure the voltage at the +50 V dc test point on the system board.
The voltage should measure approximately +50 V dc. If incorrect, go
to step 3. If incorrect, go to step 4.
Measure the voltage at CN2-18 on the LVPS. The voltage should
measure approximately +50 V dc. If incorrect, replace the LVPS
assembly. If correct, replace the system board. If this does not fix the
problem, replace the interconnect card assembly.
Make sure the cable is connected properly to the system board and
fuser control board. Reconnect the cable, if necessary. If the cable is
connected correctly, go to step 5.
If no problems were found in steps 1 through 4, replace the fuser
assembly. See "Fuser assembly removal" on page
1
J4
1
J1 1
J6
"Fuser
J5
4-26.