Fuser Service Check - Lexmark C540n Service Manual

Step Questions / actions
Turn the printer on, and check the values at
5
JBIN1:
Pin Value
0 V dc (+5 V dc during cycle)
4
+0 V dc (unblocked), +3.3 V dc
5
(blocked)
Ground
6
Are the values correct?

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
"Top cover assembly removal"
4-13. Check the cable at JFUSES1
on page
for 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?
JBIN1
Yes
Replace the fuser exit
sensor. See
"Fuser exit
sensor removal" on
page 4-36.
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.
Repair the cables. If the
cables cannot be repaired,
replaced the fuser. See
"Fuser assembly
removal" on page 4-32.
5025-2xx, 4xx
No
Replace the controller
board. See
"Controller
board removal" on
page 4-20.
No
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Diagnostic information
2-31
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