Xerox 450c Service Manual page 41

4. Check the position of the paper
feed cam.
5. Manually rotate the paper feed cam
one complete revolution. Note action
of cam.
Result: Cam mechanism operates
freely?
No: Replace the printer (REP 2.1.18:
Printer Assembly on page 4-24).
Yes: Continue with Step 5.
6. Check voltage between GND and the
pins 15 and 16 on CN10 on the main
circuit board (Figure 2-6).
Pins 15 and 16
Figure 2-6 CN10 pin locations
Result: Voltage is between 41.2
VDC and 42.2 VDC??
No: Go to RAP 2.2: Power Supply DC
Voltage Check on page 2-12.
Yes: Continue with Step 6.
7. Replace the paper feed motor
(REP 2.1.5: Paper Feed Motor on
page 4-8). If this does not solve the
problem, replace the main circuit
board (REP 5.1.2: Main Board on
page 4-39).
Xerox WorkCentre 450c/450cp Service Manual
NOTE: You may choose to check the paper
feed motor for an open motor winding.
Table 2-2 gives the resistance values
between pins on the motor wiring harness.
Table 2-2 Paper Feed Motor Winding Resistance
1st Pin 2nd Pin
1 3
1 5
2 4
2 6
If the resistance is too low, then there is a short
in the paper feed motor winding. If the resistance
is infinite, or too high, then there is an open in the
motor winding.
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Resistance
18 - 22 ohms
18 - 22 ohms
18 - 22 ohms
18 - 22 ohms
Page 2-17