Lexmark X746de Service Manual page 89

Step Questions / actions
1. Remove the fuser. See
2
removal" on page
2. Check the fuser AC autoconnect cable for
damage, check the other end of the cable
for damaged pins.
Fuser autoconnects
3. Check the fuser DC autoconnect cable for
damaged pins.
DC autoconnect
On printer
AC autoconnect
Are the connectors damaged?
Replace the fuser. See
3
removal" on page
Did the error clear?
1. Remove the rear frame cover. See
4
frame cover removal" on page
2. Check the cable in connector JFUSER1
(fuser DC cable) for proper connection to
the system board. the cable for pinch
points, and the cable or connector for any
other damage.
Is the cable damaged?
Check the cable in connector JLVPS2 for
5
proper connection to the system board, the
cable for pinch points, and the cable or
connector for any other damage.
Is the cable damaged?
Measure the continuity across all of the fuses
6
on the system board.
Are any of the fuses blown?
"Fuser assembly
4-104.
"Fuser assembly
4-104.
"Rear
4-37.
Yes
Replace the appropriate
cable (either the fuser AC
or the fuser DC cable). See
"Fuser AC cable
removal" on page 4-105
or
"Fuser DC cable
removal" on page 4-107.
Problem resolved.
Replace the fuser DC
cable. See
"Fuser DC
cable removal" on
page 4-107.
Replace the LVPS. See
"Low-voltage power
supply (LVPS) removal"
on page 4-115.
Replace the system board.
See
"System board
removal" on page 4-157.
7526
No
Go to step 3
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Diagnostic information
2-49
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