Lexmark X734de Service Manual page 83

Step Questions / actions
Check for the following continuity between the
7
DC autoconnect and JFUSER1 on the system
board.
Is continuity present?
Check for continuity between the following
8
pins of the AC autoconnect and the pins of
the connector that connects to the LVPS.
LVPS
connect
Pin 1
Pin 3
Is continuity present?
DC auto- JFUSER1
connect
Pin 9 Pin 9
Pin 10 Pin 10
AC Auto-
connect
Pin 5
Pin 1
Yes
Go to step 9.
Replace the system board.
See
"System board
removal" on page 4-165.
7526
No
Replace the fuser DC
cable. See
"Fuser DC
cable removal" on
page 4-117.
Replace the fuser AC
cable. See
"Fuser AC
cable removal" on
page 4-115.
Diagnostic information
2-45
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