TM 5-2350-378-23&P
0021
APPARENT HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM PROBLEM - Continued
STEP
8.
Disconnect umbilical cable connector W4P1 from HDC control box connector J1 (Figures 7 and 8).
HDC
CONTROL BOX
CONTROL BOX
CONNECTOR J1
UMBILICAL CABLE
CONNECTOR W4P1
T01907HDC
Figure 7. Umbilical Cable Assembly W4 Connections to Hydraulic Diagnostic Center (HDC) Control Box.
A
C
B
PLUG
T01908HDC
Figure 8. Pin Layout for Connector W4P1.
CONDITION/INDICATION
Is 28 VDC present between umbilical cable connector W4P1 pins A and B?
DECISION
YES - Replace HDC control box.
NO - Go to Step (9).
