Laser Unit Assembly - Xerox Phaser 4500 Service Manual

Laser Unit Assembly

Troubleshooting Reference
Applicable Parts
Laser Unit Assembly
Laser Unit Harness Assembly
5 V Interlock
LVPS Harness Assembly
HVPS/Engine Logic Board
LVPS
Troubleshooting Procedure
Steps Actions and Questions
1
1. Remove the Top Cover Assembly
(page 8-10).
2. Disconnect P/J140 from Laser Unit
Assembly.
3. Reinstall the Top Cover Assembly.
4. Install the Print Cartridge and close the
Top Cover.
5. Measure the voltage across J140-8 <=>
J140-7.
Does the voltage measure +5 VDC?
2 Check the 5 V Interlock.
1. Disconnect the 5 V Interlock at P/J142
(clamped to the side of the gear housing
near the Exit Motor PWBA).
2. Test for continuity between P/J142-1
<=> P/J142-3 while opening and closing
the Top Cover.
Is there continuity when the Top Cover
is closed, and no continuity when the
Top Cover is open?
3 Check the Laser Interlock:
1. Unplug P/J144.
2. Test for continuity between P/J144-1
<=> P/J144-3 while opening and closing
the Top Cover.
Is there continuity when the Top Cover
is closed, and no continuity when the
Top Cover is open?
General Troubleshooting
Wiring and Plug/Jack Map References
"Laser Unit, 5 V Interlock, Interlock Switch
Assembly" on page 10-24
"24 V Interlock, Rear Cover Switch, Main Motor, Sub
Fan, Exit Motor Assembly" on page 10-18
"Print Engine General Wiring Diagram" on
page 10-17
"Print Engine Plug/Jack Locator" on page 10-3
Yes
Go to step 8.
Go to step 3.
Go to step 4.
No
Go to step 2.
Replace the 5 V
Interlock.
(page 8-49)
Replace Interlock
Switch Assembly
(page 8-13).
4-13