TM 1-2840-252-23-3
G-51
FAULT CODE B6, ECL RESOLVER EXPANDED INSTRUCTIONS
Refer to numbered steps in figure 137.
Step 4.
Check harness connector PL3 (figure 201) at DECU, and connector at ECL quadrant for tight
connections.
Step 5.
Disconnect PL3 and ECL quadrant connectors to check pins and sockets.
Step 7.
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. Limitis 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 b cause switch can be
e
open or closed at that point.)
Step 8.
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 -1 00Ω. 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 quadr nt (gain discrete) at pins 5 and 11 while
a
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 9.
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 12.
Refer to manufacturer's procedure for checking operation of ECL quadrant.
Step 17.
Refer to manufacturer's procedure for diagnosing and replacing harness or ECL quadrant.
Step 20.
Refer to manufacturer's procedure replacing ECL quadrant.
Step 21.
Refer to manufacturer's procedure for diagnosing and replacing harness.
Step 22.
Refer to manufacturer's procedure for diagnosing and replacing ECL quadrant.
G-116
