Xerox 4400DT - Phaser B/W Laser Printer, Service Manual, Page: 65 / 503

2-28 Phaser 4400 Laser Printer Service Manual
6 1. Remove the Left Interface Cover (RRP 1.1 on
page 6-6 ), Left Cover (RRP 1.2 on page 6-7 ), and the
Left Plate (RRP 1.11 on page 6-16 ).
2. Enter Service Diagnostics and select Motors/Fans
Tests.
3. Scroll to Stacker Motor.
4. On the Engine Logic Board, measure the voltage
between P/J35 pin 6 and frame ground as you press
OK .
Does the voltage drop from +3.3 VDC to
+0.5 VDC when OK is pressed?
Go to step 7. Replace the
Engine Logic
Board (RRP
9.3 on
page 6-89 ).
7 1. Switch the printer power OFF.
2. Remove the Stacker from the printer (RRP 10.1 on
page 6-101 ) and turn the Stacker upside down.
3. Disconnect P/J210 from the Stacker PWB.
4. Check the resistance between pins 1 and 4, pins 1
and 6, pins 2 and 3, and pins 2 and 5 on the
disconnected plug.
Are all readings 70 ± 10 ohms?
Replace the
Stacker PWB
(RRP 10.7
on
page 6-107 ).
Replace the
Stacker
Motor (RRP
10.8 on
page 6-108 ).
8 1. Open the Stacker Rear Cover.
2. Press OK to run the Stacker Motor.
3. Check the Stacker rollers.
Are the Stacker Rollers rotating smoothly?
Go to step 9. Repair or
replace the
Stacker
Rollers as
necessary
(RRP 10.14
on
page 6-114 /
RRP 10.15
on
page 6-115 ).
9 1. Switch the printer power OFF.
2. Remove the Stacker (RRP 10.1 on page 6-101 ).
3. Open the printer rear cover and check the movement
of the Exit Gate.
Does the Exit Gate move freely in both
directions when pressed and released?
Go to step
10. Repair or
replace the
Exit Gate as
necessary
(RRP 6.4 on
page 6-69 ).
10 1. Reinstall the Stacker.
Note: Each time the printer’s rear cover or front
cover is opened and closed with power
applied, the printer performs a reset. At the
completion of the reset, the Exit Gate toggles
between fully open and fully closed
positions.
2. Open the printer rear cover. Remove the Duplex Unit
if installed.
3. Switch the printer power-on.
4. Cheat the Rear Cover Interlock and watch the Exit
Gate at the end of reset.
5. Remove then replace the Rear Cover Interlock
cheater.
Does the Exit Gate toggle at the completion of
each reset?
Replace the
Stacker PWB
(RRP 10.7
on
page 6-107 ).
If the
problem
persists,
replace the
Engine Logic
Board (RRP
9.3 on
page 6-89 ).
Replace the
Direction
Solenoid
(RRP 10.10
on
page 6-110 ).
If the
problem
persists,
replace the
Stacker PWB
(RRP 10.7
on
page 6-107 ).
Stacker Jam Troubleshooting Procedure (cont'd.)
Step Actions and Questions Yes No