4-42 Phaser 4500/4510 Service Manual
General Troubleshooting
3 Check the no paper sensor (2)
1.Install the optional 550-sheet feeder
(page 8-86).
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 4-39, or
“Optional
550-Sheet
Feeder PWBA
(Tray 4)” on
page 4-40.
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 8-73).
7 Replace the no paper sensor (page 8-21).
Does the problem still occur after
replacement?
Replace the
HVPS/engine
logic board
(page 8-73).
Problem
solved.
Troubleshooting Procedure (continued)
Steps Actions and Questions Yes No
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