Lexmark X642E, Service Manual, Page: 178 / 525

2-140
Service Manual
7002-xxx
Fuser solenoid service check
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 “Fuser
solenoid adjustment” on page 4-2 .
FRU Action
1 Fuser envelope conditioner
solenoid 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.
The resistance measures between 5 ohms and 10 ohms. If incorrect,
replace the fuser assembly. If correct, go to step 2.
2 System board Measure the voltage at the +50 V dc test point on the system board.
The voltage should measure approxi50 V dc. If incorrect, go
to step 3. If incorrect, go to step 4.
3 LVPS Measure the voltage at CN2-18 on the LVPS. The voltage should
measure approxi50 V dc. If incorrect, replace the LVPS
assembly. See
“Low voltage power supply removal” on
page 4-109 . If correct, replace the system board. See “System
board and inner shield removal—model X642e” on page 4-130 or
“System board and inner shield removal —models X644e/
X646e” on page 4-131
.
4 Fuser board to system
board cable 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.
5 Fuser assembly If no problems were found in steps 1 through 4, replace the fuser
assembly. See
“Fuser assembly removal” on page 4-79 .
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.