4-4 Phaser 4500 Service Manual
DC Power Supply Troubleshooting
LVPS (Low Voltage Power Supply)
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
■ LVPS
■ HVPS/Engine Logic Board
■ LVPS Harness Assembly
■ “24 V Interlock, Rear Cover Switch, Main Motor, Sub
Fan, Exit Motor Assembly” on page 10-18.
■ “Printer Rear” on page 10-8
Troubleshooting Procedure
Steps Actions and Questions Yes No
1
Check the LVPS control power:
1. Remove the LVPS Shield Plate
(page 8-75).
2. Disconnect P/J41 from the LVPS.
3. Turn the power ON.
4. Measure the voltages at the following
test points:
■ P/J41-1 <=> P/J41-2: 3.3 V
■ P/J41-4 <=> P/J41-3: 5 V
Are the voltages measured within the
specified range?
Go to step 2. Replace the
LVPS.
(page 8-78)
2
Check the LVPS motor power:
1. Disconnect P/J42 from the LVPS.
2. Turn the power ON.
3. Measure the voltage across P/J42-1 <=>
P/J42-2.
Does the voltage measure 24 VDC?
Go to step 3. Go to “24 V
Interlock” on
page 4-26,
“Rear Cover
Switch” on
page 4-28, or
“Interlock Switch
Assembly” on
page 4-29.
3
Check the LVPS Harness for continuity:
1. Turn the power OFF.
2. Disconnect P/J11 from the HVPS/
Engine Logic Board.
3. Disconnect P/J41 from the LVPS.
4. Check each conductor in the harness for
continuity.
Is each conductor of J11 <=> J41
continuous?
Go to step 4. Replace the
LVPS Harness
Assembly
(page 8-78).
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