Fuser Service Check - Lexmark X543 Service Manual

7525-xxx

Fuser service check

Step Questions / actions
Some low-voltage power supply FRUs have a
1
voltage selector switch. If it does, the switch
needs to be set to the correct voltage for your
area
Has the LVPS been changed?
Turn the printer off, and remove the rear
2
shield. See
"Rear shield removal" on
4-7. Check the cable at JFUSES1 for
page
proper connection to the controller board, the
cable for pinch points, and the cable or
connector for any other damage.
Is the cable damaged?
Check the connector JLVPS1 for proper
3
connection to the controller board, the cable
for pinch points, and the cable or connector for
any other damage.
Is the cable damaged?
Check the power cable on the left side of the
4
fuser and the thermistor cables and
connections on the right side of the fuser.
Are the cables or connectors damaged?
Disconnect the cable at JFUSES1 on the
5
controller board, and check the following
voltages:
Pin Value
1 +24 V dc (doors closed)
2 +24 V dc (doors closed)
3 +24 V dc (doors closed)
4 +24 V dc (doors closed)
5 Between 0.6 and 3.28 V dc
6 Ground
8 Ground
10 Between -3 and +3.3 V dc
11 Ground (no wire
Are the values approximately correct?
Service Manual
2-42
JFUSES1
Yes
Check the switch on the
side of the LVPS to verify
the correct voltage is set.
Replace the fuser cable.
Repair or replace the LVPS
cable. See
"Low-voltage
power supply (LVPS)
assembly" on page 4-48.
Repair the cables. If the
cables cannot be repaired,
replaced the fuser. See
"Fuser assembly
removal" on page 4-28.
Go to step 6.
No
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Replace the controller
board. See
"Controller
board removal" on
page 4-18.
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