Lexmark C734dn - XX-System Board Failure Service Check

Diagnostic information 2-121
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956.xx—System board failure service check
5 V interlock switch service check
Step Questions / actions Yes No
1 Turn the printer off, and remove the rear
frame cover. See “Rear frame cover
removal” on page 4-33.
Check the cable in connector J49 for proper
connection to the system board.
Is the cable seated correctly?
Replace the system board.
See “System board
removal” on page 4-153.
Reseat the cable.
Step Questions / actions Yes No
1 Is the +5 V interlock switch damaged? Replace the 5 V interlock
switch. See “5 V interlock
switch cable removal” on
page 4-45.
Go to step 2.
A
A