Lexmark X748dte - Interlock Switch Service Check

Diagnostic information 2-139
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5 V interlock switch service check
Step Questions / actions Yes No
1 Is the +5 V switch (B) damaged? Replace the 5 V interlock
switch. See “5 V interlock
switch cable removal” on
page 4-48.
Go to step 2.
2
1. Turn the printer off.
2. Remove the rear frame cover. See “Rear
frame cover removal” on page 4-37.
3. Check the cable in connector JINT1 for
proper connection to the system board, for
pinch points, and for any other damage to
the cable or connector.
Is the cable damaged?
Replace the 5 V interlock
switch. See “5 V interlock
switch cable removal” on
page 4-48.
Go to step 3.
3
1. Disconnect the cable in connector JINT1.
2. Connect the new 5 V interlock switch to
JINT1.
3. Bring the printer up in the Diagnostics
menu (turn off the printer, press and hold
3 and 6, turn on the printer.)
4. Activate the new 5 V interlock switch.
5. Does the display go from Close front door
to the Diagnostics Menu?
Replace the 5 V interlock
switch. See “5 V interlock
switch cable removal” on
page 4-48.
Replace the system board.
See “System board
removal” on page 4-165.