09/03
2-101
DC 3535/2240/1632, WC M24
6-277
Status Indicator RAPs
Initial issue
6-277 IIT/DADF Communication
Communication cannot be established between the IIT/IPS and the DADF Control PWB.
Procedure
Switch on the power. CR4 on the DADF Control PWB illuminates.
YN
+5VDC is measured between the DADF Control PWB P/J550-6 (+) and ground (-).
YN
Check the +5VDC circuit to the DADF Control PWB P/J550-6 by referring to Section
7 Wiring Data (DADF+5VDC)
Replace the DADF Control PWB (PL 20.3).
Switch off the power. Check continuity of the following (Figure 1):
Between IIT/IPS PWB P/J725-20 and DADF Control PWB P/J551-A1
Between IIT/IPS PWB P/J725-19 and DADF Control PWB P/J551-A2
Between IIT/IPS PWB P/J725-18 and DADF Control PWB P/J551-A3
Between IIT/IPS PWB P/J725-17 and DADF Control PWB P/J551-A4
The resistance is 4 Ohms or less for all wires.
YN
Check wires with more than 4 Ohms for an open circuit or poor contact (Refer to Flag 1
and Flag 2).
Replace the DADF Control PWB (PL 20.3).
If the problem continues, replace the IIT/IPS PWB (PL 18.3).
Figure 1 6-277 RAP Circuit Diagram - IIT DADF Communication
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