Main Motor Failure - Xerox 4400DT - Phaser B/W Laser Printer Service Manual

Tray Failure Troubleshooting Procedure (cont'd.)
Step Actions and Questions
16 1. Remove Tray 2 from the feeder.
2. Check the voltage between the lower terminal on the
Feeder Connector and frame ground.
Is the voltage +24 VDC?
17 Check the wiring harness between the Tray 1 Size
PWB (P/J51) and the Tray 2 Size PWB (P/J52).
Is the harness in good condition?
18 Replace the following components, in order, until the
problem is resolved:
Stack Height Sensor (RRP 11.13 on
I
Feeder PWB (RRP 11.9 on
I
Size PWB (RRP 11.19 on
I
Engine Logic Board (RRP 9.3 on
I
19 Remove the tray now occupying the Tray 1 position
and continue with
page 3-26.

Main Motor Failure.

(U1 Motor Fail/Power Off)
Main Motor speed is less than specified RPM after 1.3 seconds.
There is a problem with the Main Motor.
Main Motor Failure Troubleshooting Procedure
Step Actions and Questions
1 1. Switch the printer power OFF.
2. Remove the Left Interface Cover (RRP 1.1 on
page 6-6), the Left Cover (RRP 1.2 on
the Left Plate (RRP 1.11 on
3. Open the Rear Cover and, if installed, remove the
Duplex Unit.
4. Manually rotate the rotor of the Main Motor clockwise
(as viewed from the left side of the printer).
Does the rotor of the Main Motor rotate
smoothly?
2 1. Open the Front Cover and remove Print Cartridge.
2. Manually rotate the rotor of motor clockwise.
Does the rotor of the Main Motor rotate
smoothly?
Phaser 4400 Laser Printer Service Manual
page 6-128)
page 6-139)
page
Tray Motor Assembly Checkout
page 6-16).
Yes
Go to step
18.
Replace the
Tray 2 Size
PWB (RRP
11.19 on
page
then the Tray
2 Feeder
PWB (RRP
11.9 on
page
page 6-132)
6-89)
on
Yes
Go to step 5.
page 6-7), and
Replace the
Print
Cartridge.
No
Go to step
17.
Replace the
Size Harness
Assembly
(PL 11.1 on
6-139) page 7-27).
6-128).
No
Go to step 2.
Go to step 3.
2-45