Xerox Phaser 4500 Service Manual page 167

Phaser 4500/4510 Service Manual
Troubleshooting Procedure (continued)
Steps Actions and Questions
Check the 5 V Interlock.
2
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?
Check the LVPS harness:
4
1. Disconnect P/J141 of the LVPS harness
(near the Laser Unit PWBA).
2. Test for continuity between P/J141-1 <=>
P/J141-3 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?
5 Check the laser unit harness:
1. Disconnect P/J14 from the HVPS/engine
logic board.
2. Disconnect P/J140 from laser unit
assembly.
3. Test for continuity between P/J14-1 <=>
P/J140-8 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?
6 Check power to the HVPS/engine logic
board:
1. Remove the LVPS Shield Plate
(page 8-60).
2. Install the print cartridge.
3. Disconnect P/J41 from the LVPS.
4. Measure the voltage across P/J41-4 <=>
P/J41-3 on the board.
Does the voltage measure +5 VDC?
General Troubleshooting
Yes No
Go to step 3. Replace the 5
V Interlock.
(page 8-40)
Go to step 4. Replace
Interlock
switch
assembly
(page 8-12).
Go to step 5. Replace the
LVPS harness
assembly.
Go to step 6. Replace the
laser unit
harness
assembly.
Go to step 7. Replace the
LVPS
(page 8-62).
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