Xerox Phaser 4500 Service Manual page 206

General Troubleshooting
4-52
Troubleshooting Procedure (continued)
Steps Actions and Questions
Check the duplex unit sensor (1):
2
1. Enter Service Diagnostics, and from the
Sensor Tests
test.
Sensor
Does the sensor correctly report the
position of the actuator?
Check the duplex unit sensor (2):
3
1. Open the duplex unit housing cover and
keep open.
2. Measure the voltage across P/J53-3 <=>
P/J53-2 while manually operating the
duplex unit actuator.
Does the voltage measure 0 VDC when the
actuator is pushed, and 3.3 VDC when
released?
Replace the duplex unit sensor
4
(page 8-106).
Does the problem still occur after
replacement?
Check the duplex unit sensor harness:
5
1. Remove the duplex unit sensor.
2. Disconnect P/J53 from the duplex unit
PWBA.
3. Test each cable between J53 <=> J530
for continuity.
Is each cable continuous?
Check the duplex unit harness:
6
1. Remove the duplex unit harness.
2. Test for continuity across J50 <=> J2750.
Is it continuous?
7 Check the LVPS harness assembly:
1. Remove the LVPS harness assembly.
2. Test for continuity across J27 <=> J2750.
Is it continuous?
Check the HVPS/engine logic board:
8
1. Disconnect P/J11 from the HVPS/engine
logic board.
2. Test for continuity across P11-16 <=>
P27-4.
Is it continuous?
Yes
Replace the
HVPS/engine
logic board
menu select Duplex
(page 8-73).
Replace the
HVPS/engine
logic board
(page 8-73).
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
Go to "LVPS
(Low Voltage
Power
Supply)" on
page 4-4.
Phaser 4500/4510 Service Manual
No
Go to step 4.
Go to step 4.
Problem
solved.
Replace the
duplex unit
sensor
harness.
Replace the
duplex unit
harness.
Replace the
LVPS harness
assembly.
Replace the
HVPS/engine
logic board
(page 8-73).