No Recognition Of Duplex Unit - Xerox Phaser 4500 Service Manual

No Recognition of Duplex Unit

Troubleshooting Reference
Applicable Parts
HVPS/Engine Logic Board
LVPS Harness Assembly
Duplex Unit PWBA
Duplex Unit Assembly Harness
Troubleshooting Procedure
Steps Actions and Questions
1 Check the Duplex Unit detection signal:
1. Remove the Duplex Unit PWBA
(page 8-123).
2. Remove the Duplex Unit Assembly
Harness (page 8-121).
3. Connect J2750 of the Duplex Unit
Assembly Harness to P2750 of the
LVPS Harness Assembly.
4. Measure the voltage across P2750-5
and J2750-6.
Does the voltage measure +3.3 VDC?
2
Check the Duplex Unit detection signal (2):
Measure the voltage across P/J27-4 and
P/J27-3 on the HVPS/Engine Logic Board.
Does the voltage measure +3.3 VDC?
3 Check the LVPS Harness Assembly:
1. Remove the Duplex Unit Assembly
Harness (page 8-121).
2. Check the following for continuity:
J27-4 <=> J2750-5
J27-3 <=> J2750-6
J27-2 <=> J2750-7
J27-1 <=> J2750-8
Is each continuous?
Error Messages and Codes
Wiring and Plug/Jack Map References
"Duplex Unit Signal Diagram" on page 10-30
"Duplex Unit General Wiring Diagram" on
page 10-29
"Duplex Unit Plug/Jack Locator" on page 10-12
Yes
Go to step 4.
Go to step 3.
Go to step 4.
No
Go to step 2.
Replace the
HVPS/Engine
Logic Board
(page 8-89).
Replace the
LVPS Harness
Assembly.
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