Lexmark C752 Service Manual page 151

Fan in finisher inoperative
Step Action and questions
1 Make sure the fan cable, H6, is correctly connected to
CN21 on the finisher system board.
Is the cable connected correctly?
2 Check the cable H6 connection to the fan assembly.
Is the cable connected correctly?
3 Check the voltage between CN21-1 and CN21-2. The
voltage measures approximately +24 V dc.
Is the voltage correct?
4 Check continuity of the fan cable H6.
Do you measure continuity?
No indication that the chad box is full, no message
Step Action and questions
1 Make sure the chad box is correctly installed in the
finisher.
Is the chad box correctly installed?
2 Make sure the chad box cable S5 is properly
connected to CN5 on the finisher system board.
Is the cable properly connected?
3 Make sure the chad box cable is properly connected to
the chad box sensor located above the box.
Is the cable properly connected to the sensor?
4 Check the chad box sensor with a voltmeter. Empty the
chad box. Check the voltages on CN5. The voltages
read the following approximate values with the chad
box empty:
Connector pin Voltage
CN5-1 +5 V dc
CN5-2 +5 V dc
CN5-3 0 V dc
Are the voltages correct?
5 Check the sensor by placing the chad box or a piece of
paper in front of the sensor. As the chad box or piece of
paper is moved away from the front of the sensor the
voltage on CN5-2 should change from +5 V dc to 0 V
dc.
Does the voltage change?
+5 V dc supply
sensor signal
Ground
Yes No
Go to step 2 Install the cable
correctly
Go to step 3 Install the cable
correctly
Go to step 4 Replace the
finisher system
board
Replace the fan Replace cable
assembly H6
Yes No
Go to step 2 Install the chad
box correctly
Go to step 3 Install the cable
correctly
Go to step 4 Install the cable
correctly
Go to step 5 Replace the
finisher system
board
Problem solved Replace the chad
box sensor.
Diagnostic information
5060-2XX
2-117