Lexmark C752 Service Manual page 150

5060-2XX
Step Action and questions
6 Check the voltage on the output options autoconnect
connector Pin 2 located on the top right rear of the
printer. The voltage measures approximately +5 V dc.
Is the voltage correct?
7 Check the AC line voltage between CN2-1 and CN2-3
on the relay board. The line voltage should be within
specifications for the AC power source the printer is
connected to.
Is there line voltage at CN2?
8 Check the AC line voltage between CN1-1 and CN1-5
on the relay board. The line voltage should be within
specifications for the AC power source the printer is
connected to.
Is there line voltage at CN1?
9 Check continuity of the AC line cord.
Is there continuity?
10 Check the voltage at J2-5 on the system board. The
voltage measures approximately +5 V dc.
Is the voltage correct?
Front door is open, no indication on display
Step Action and questions
1 Make sure the front door is activating the cover switch.
Is the door activating the cover switch?
2 Check door - door switch activating tab (broken or
missing).
Is the front door and door activating tab damaged,
broken or missing?
3 Check the front door magnetic latches to make sure
the front door closes correctly.
Are the magnetic latches functioning properly?
4 Check the front door switch cable connection to CN11
on the finisher system board.
Is the cable connected correctly?
5 Check the continuity of the front switch as the switch is
activated.
Do you measure continuity?
6 Check continuity of the front door switch cable.
Do you measure continuity?
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Service Manual
Yes No
Go to step 7 Go to step 10
Replace the Go to step 8
LVPS assembly
Replace the relay Go to step 9
board assembly
Go to step 10 Replace the line
cord
Replace the top Replace the
options cable system board
Yes No
Go to step 2 Repair or replace
the door
assembly
Replace the front Go to step 3
door assembly
Go to step 4 Replace the
magnetic latches
Go to step 5 Install the cable
correctly
Go to step 6 Replace the front
door switch
Replace the Replace the front
finisher system door switch cable
board D1