Lexmark Optra C710 Service Manual page 141

5016-001
FRU
8 LVPS Fuses
F401, F402
either or both
continue to blow
after being
replaced.
(Continued)
9 AC Input
Receptacle
10 AC receptacle
to AC On/Off
Wiring.
11 AC On/Off
Switch LVPS to
AC On/Off
Switch Wiring
Action
The problem might be with any +24 V dc device,
such as stepper motor, solenoid or clutch
connected to the engine board. Remove and
replace one FRU at a time until you find the
failing component.
Note: A shorted motor, case to winding short,
may also damage the engine board. It may be
necessary to replace both the motor and the
board.
Check the AC input receptacle for signs of
damage.
• If damage is found, replace the receptacle.
• If no damage is found, go to step 10.
Check that the wiring is correctly installed and
connected to the AC input receptacle and the
AC On/Off switch. Check the wiring for signs of
damage.
• If correct, check the blue and gray wires for
continuity and go to step 11.
• If incorrect, replace the faulty cable.
Check the wiring from the LVPS to the AC
On/Off switch verifying it is installed properly
and not damaged. If incorrect, replace the
switch.
Diagnostic Information
2-75