Page 2-32
Xerox WorkCentre 450c/450cp Service Manual
RAP 5.2: Scanner Motor
See Parts List 1.1.
1. Check the wiring harness from the
main board connector CN5 to the
scanner motor (Figure 2-21).
Figure 2-21 Scanner Motor Wiring
Harness
Result: Wiring harness is securely
connected?
No:
Connect the wiring harness
securely to connector CN5.
Yes:
Continue with Step 2.
2. Power on the unit. Check the voltage
across main board connector CN5 pin
1 and GND.
Result: Voltage is between 40.3
VDC and 41.3 VDC??
Connector CN5 - Pin 1
No:
Perform RAP 2.2: Power Supply DC Voltage Check on page 2-12.
Yes:
Continue with Step 3.
3. Perform RAP 5.1: Doc and Read Point Sensor on page 2-30.
Result: Sensors are functioning normally?
No:
Replace DOC and read point sensors
(REP 4.1.5: Doc and Read Point Sensor Assembly on page 4-35).
Yes:
Replace the scanner motor
(REP 4.1.7: Scanner motor and gear assembly on page 4-37.
NOTE: You may choose to check the paper
feed motor for an open motor winding.
Table 2-4 gives the resistance values
between pins on the scanner motor wiring harness.
If the resistance is too low, then there is a short
in the scanner motor winding. If the resistance is infinite,
or too high, then there is an open in the motor winding.
Table 2-4 Scanner Motor Winding Resistance
1st Pin
2nd Pin
Resistance
1
3
54 - 66 ohms
1
4
54 - 66 ohms
2
5
54 - 66 ohms
2
6
54 - 66 ohms
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