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Chapter 1 Troubleshooting
FIP2.7 No Recognition of Option Duplex
Step Check
Yes
No
Possible causes:
HVPS/MCU (PL12.1.19)
HARNESS ASSY LVPS (PL12.1.1)
PWBA DUPLEX (PL21.1.32)
HARNESS ASSY DUP (PL21.1.7)
1
Checking Option Duplex detection signal (1)
Remove PWBA DUPLEX. (RRP21.5)
Remove HARNESS ASSY DUP.
Connect J2750 of HARNESS ASSY DUP to P2750 of
HARNESS ASSY LVPS.
Is the voltage across P2750-5(+) and J2750-6(-),
3.3VDC?
Go to step 4.
Go to step 2.
2
Checking Option Duplex detection signal (2)
Is the voltage across P/J27-4(+) and P/J27-3(-) on
HVPS/MCU, 3.3 VDC?
Go to step 3.
Replace HVPS/
MCU. (RRP12.10)
3
Checking HARNESS ASSY LVPS for continuity
Remove HARNESS ASSY LVPS.
Is there continuity between each of the following?
J27-4 and J2750-5
J27-3 and J2750-6
J27-2 and J2750-7
J27-1 and J2750-8
Go to step 4.
Replace HAR-
NESS ASSY LVPS.
4
Checking HARNESS ASSY DUP for continuity
Disconnect connectors of HARNESS ASSY DUP.
Is there continuity between each of the following?
J2750-3 and J50-8
J2750-4 and J50-7
J2750-5 and J50-6
J2750-6 and J50-5
Replace PWBA
DUPLEX.
(RRP21.5)
Replace HAR-
NESS ASSY DUP.
