Phaser 4500/4510 Service Manual 4-13
General Troubleshooting
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?
Go to step 3. Replace the 5
V Interlock.
(page 8-40)
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?
Go to step 4. Replace
Interlock
switch
assembly
(page 8-12).
4 Check the LVPS harness:
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?
Go to step 5. Replace the
LVPS harness
assembly.
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?
Go to step 6. Replace the
laser unit
harness
assembly.
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?
Go to step 7. Replace the
LVPS
(page 8-62).
Troubleshooting Procedure (continued)
Steps Actions and Questions Yes No