Phaser 4500/4510 Service Manual 4-17
General Troubleshooting
Registration Sensor 
9 Replace the LVPS (page 8-62).      
Does the problem still occur after 
replacement?
Replace the 
fuser 
assembly 
(page 8-44).
Problem 
solved.
Troubleshooting Reference 
Applicable Parts Wiring and Plug/Jack Map References
■ Registration sensor
■ Registration sensor actuator
■ 150-sheet feeder assembly
■ Tray 1 assembly harness
■ Chute assembly harness
■ HVPS/engine logic board
■ LVPS
■ “150-Sheet Feeder, 550-Sheet Feeder, Main 
Fan” on page 10-27
■ “Print Engine Wiring Diagrams” on page 10-19
■ “Print Engine Plug/Jack Locator” on page 10-3
Troubleshooting Procedure
Steps Actions and Questions Yes No
1 Check the registration sensor actuator for 
operation and shape:
1.Remove the 150-sheet feeder assembly 
(page 8-15).
Does the registration sensor actuator 
operate smoothly? 
Is the flag of the registration sensor 
actuator formed normally to shield the 
sensor detecting point?
Go to step 2. Replace the 
150-sheet 
feeder 
(page 8-15).
2 Check the registration sensor:
1.Re-connect J241 of the tray 1 assembly 
harness to the registration sensor (with 
150-sheet feeder removed).
2.Enter Service Diagnostics, and from the 
Sensor Tests menu select 
Registration Sensor.
3.Manually actuate the registration sensor.
Does the sensor operate correctly?
Replace the 
HVPS/engine 
logic board 
(page 8-73).
Go to step 3.
Troubleshooting Procedure (continued)
Steps Actions and Questions Yes No