TM 1-2840-252-23-3
G-30
FAULT CODE A5, ECL RESOLVER EXPANDED INSTRUCTIONS
Step 2.
Check harness connector PL3 (figure 201) at DECU, and connector at ECL quadrant for tight connections.
Step 3.
Disconnect PL3 and ECL quadrant connectors to check pins and sockets.
Step 5.
Set ECL to STOP. With PL3 disconnected, check resistance of ECL quadrant (excitation) at harness PL3
connector sockets h and i (figure 202). Limit is 35 - 42Ω. Check resistance of ECL quadrant (signal) at
sockets EE and DD. Limit is 90 102Ω. Monitor resistance of ECL quadrant (interlock discrete) at sockets f
and LL while moving ECL from STOP to GROUND to FLIGHT. Limits are defined in table below. Monitor
resistance of ECL quadrant (gain discrete) at sockets MM and LL while moving ECL from STOP to GROUND
to FLIGHT. Limits are as defined in table below. (Note: Gain discrete resistance is not checked at GROUND
because switch can be open or closed at that point.)
Step 6.
Set ECL to STOP. With ECL quadrant connector disconnected, check resistance of ECL quadrant
(excitation) at quadrant pins 1 and 2. Limit is 35 - 40Ω. Check resistance of ECL quadrant (signal) at
quadrant pins 3 and 4. Limit is 90 100Ω. Monitor resistance of ECL quadrant (interlock discrete) at pins 11
and 12 while moving ECL from STOP to GROUND to FLIGHT. Limits are as defined in table below. Monitor
resistance of ECL quadrant (gain discrete) at pins 5 and 11 while moving ECL from STOP to GROUND to
FLIGHT. Limits are as defined in table below. (Note: Gain discrete resistance is not checked at GROUND
because switch can be open or closed at that point.
Step 7.
Before tightening harness connector PL3 and connector at ECL resolver, be sure that keyways in harness
connectors are aligned with keyways in component connectors.
Step 10
Refer to manufacturer's procedure for checking operation of ECL quadrant.
Step 13.
Refer to manufacturer's procedure for diagnosing and replacing harness or ECL quadrant.
Step 16.
Refer to manufacturer's procedure replacing ECL quadrant.
Step 17.
Refer to manufacturer's procedure for diagnosing and replacing harnes.
s
Step 18.
Refer to manufacturer's procedure for diagnosing and replacing ECL quadrant.
G-62