Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 134

Stacker Full Sensor
The printer fails to indicate a stack full condition, or incorrectly indicates a stack full
condition.
Stacker Full Sensor Troubleshooting Procedure
Step Actions and Questions
1 1. Enter Service Diagnostics and select Sensor Tests.
2. Scroll to Stacker Full Sensor and press OK.
3. Actuate and deactuate the Stacker Stack Full Sensor
Actuator.
Does the display alternate between "Full" and
"Not Full" as you press and release the
actuator?
2 Visually inspect the Stack Full Sensor Actuator.
Does the actuator move freely and is it in good
condition (not broken or damaged)?
3 1. Switch the printer power OFF.
2. Remove the Left Interface Cover (RRP 1.1 on
page 6-6), Left Cover (RRP 1.2 on
Left Plate (RRP 1.11 on
3. Switch the printer power ON.
4. On the Engine Logic Board, measure the voltage
between P35 pin 2 and frame ground.
Is the voltage +3.3 VDC?
4 On the Engine Logic Board, measure the voltage
between P/J28 pin 10 and frame ground.
Is the voltage +3.3 VDC?
5 1. Switch the printer power OFF.
2. Reconnect P/J35 to the Engine Logic Board.
3. Switch the printer power ON.
4. On the Engine Logic Board, measure the voltage
between P/J35 pin 2 and frame ground.
Is there +3.3 VDC between P/J35 pin 2 and frame
ground when the Stack Full Sensor is
deactuated and 0.0 VDC when actuated?
Phaser 4400 Laser Printer Service Manual
page 6-7), and the
page 6-16).
Yes No
Replace the Go to step 2.
Engine Logic
Board (RRP
9.3 on
page 6-89).
Go to step 3. Replace the
Stack Full
Actuator
(RRP 10.12
on
page
Go to step 5. Go to step 4.
Replace the Replace the
Engine Logic LVPS (RRP
Board (RRP 9.5 on
9.3 on page
page 6-89).
Replace the Replace the
Engine Logic Stack Full
Board (RRP Sensor (RRP
9.3 on 10.13 on
page 6-89). page
If the
problem
persists,
replace the
Stacker PWB
(RRP 10.7
on
page
6-112).
6-91).
6-113).
6-107).
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