Xerox Phaser 4500

4-46 Phaser 4500 Service Manual
3
Check the No Paper Sensor (2)
1. Install the Optional 550-Sheet Feeder
(page 8-104).
2. Remove the Print Cartridge.
3. Close the Top Cover.
4. Remove 550-Sheet Paper Cassette.
5. Measure the voltage across P/J85-7 <=>
P/J85-6 while manually operating the No
Paper Actuator.
Is the voltage 0 VDC when the No Paper
Actuator is held up, and 3.3 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 Clutch/Sensor Harness 1:
1. Remove Clutch/Sensor Harness 1.
2. Test for continuity across the following
points:
■ J855-5 <=> J852-3
■ J855-6 <=> J852-2
■ J855-7 <=> J852-1
Are all continuous
Go to step 5. Replace Clutch/
Sensor
Harness 1.
5
Check Clutch/Sensor Harness 2:
1. Disconnect connector P/J85 from the
550-Sheet Feeder PWBA.
2. Test for continuity across the following
points:
■ J85-5 <=> J855-3
■ J85-6 <=> J855-2
■ J85-7 <=> J855-1
Are all continuous
Go to step 6. Replace Clutch/
Sensor Harness
2.
6
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 7. Replace the
HVPS/Engine
Logic Board
(page 8-89).
7
Replace the No Paper Sensor (page 8-28).
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