Xerox Phaser 4500

4-48 Phaser 4500 Service Manual
3
Check the Low Paper Sensor (2)
1. Install the Optional 550-Sheet Feeder
(page 8-104).
2. Remove the 550-Sheet Paper Cassette.
3. Measure the voltage across P/J81-3 <=>
P/J81-2 while manually operating the
Low Paper Actuator.
Is the voltage 3.3 VDC when the Low
Paper Actuator is held up, and 0 VDC
when released?
Go to “Optional
550-Sheet Feeder
PWBA (Tray 3)” on
page 4-43, or
“Optional
550-Sheet Feeder
PWBA (Tray 4)” on
page 4-44.
Go to step 4.
4
Check the Low Paper Sensor Harness:
1. Install the Optional 550-Sheet Feeder
(page 8-104).
2. Disconnect P/J810 from the Low Paper
Sensor.
3. Disconnect P/J81 from the 550-Sheet
Feeder PWBA.
4. Test J81 <=> J810 for continuity.
Are all conductors continuous?
Go to step 5. Replace the Low
Paper Sensor
Harness.
5
Check the HVPS/Engine Logic Board:
1. Disconnect P/J11 and P/J20 from the
HVPS/Engine Logic Board.
2. Test P11-16 <=> P20-5 for continuity.
Is it continuous?
Go to step 6. Replace the
HVPS/Engine
Logic Board
(page 8-89).
6
Replace Low Paper Sensor (page 8-42).
Does the problem still occur after
replacement?
Replace the
HVPS/Engine
Logic Board
(page 8-89).
Problem solved.
Troubleshooting Procedure (Continued)
Steps Actions and Questions Yes No