Xerox Phaser 4500 Service Manual

General Troubleshooting 4-15
9
Check the /ROSMOT ON signal of the
Scanner Motor:
1. Install the Print Cartridge.
2. Close the Top Cover.
3. Measure the voltage across P/J13-3 <=>
P/J13-2 on the HVPS/Engine Logic
Board.
Does the voltage measure 0 V just after
the power is turned ON, and 5 VDC 10
seconds after stopping Main Motor?
Go to step 11. Go to step 10.
10
Check the Laser Unit Harness Assembly:
1. Disconnect P/J13 from the HVPS/
Engine Logic Board.
2. Test each conductor in the harness
P/J13 <=> P/J130 for continuity.
Do all the conductors exhibit
continuity?
Replace the
HVPS/Engine
Logic Board.
(page 8-89)
Replace the
Laser Unit
Harness
Assembly.
11
Check the Laser Unit Harness Assembly:
1. Disconnect P/J17 and P/J16 from the
HVPS/Engine Logic Board.
2. Disconnect P/J170 and P/J160 from
Laser Unit Assembly.
3. Measure the following for continuity:
■ P/J17 <=> P/J170
■ P/J16 <=> P/J160
Do the conductors exhibit continuity?
Go to step 12. Replace the
Laser Unit
Harness
Assembly.
12
Check the SOS power circuit of the Laser
Unit Assembly:
1. Disconnect P/J140 from Laser Unit
Assembly.
2. Measure the following for continuity:
■ P/J140-8 <=> P/J201-1
■ P/J140-6 <=> P/J201-2
■ P/J140-7 <=> P/J201-3
Do the conductors exhibit continuity?
Go to step 13. Replace the
Laser Unit
Assembly
(page 8-46).
13
Replace the HVPS/Engine Logic Board
(page 8-89).
Does the problem still occur after
replacement?
Go to step 14. Problem solved.
14
Replace the Laser Unit Assembly
(page 8-46
Does the problem still occur after
replacement?
Go to Electrical
Noise.
Problem solved.
Troubleshooting Procedure (Continued)
Steps Actions and Questions Yes No

Xerox Phaser 4500 Specifications

General

Brand	Xerox
Model	Phaser 4500
Category	Printer
Language	English