TM 1-2840-252-23-3
G-37
FAULT CODE DE, 400 HZ RESOLVER REFERENCE EXPANDED INSTRUCTIONS
Refer to numbered steps in figure 123.
Step 2.
Check harness connector PL3 (figure 201) at DECU, ECL quadrant connector and LVDT connector for tight
connections.
Step 3.
Disconnect PL3, ECL quadrant and LVDT connectors to check pins and sockets.
Step 5.
With LVDT connector disconnected, check resistance of RTL sensor at sensor connector pins 1 and 2. Limit
is 110 - 140Ω. Check resistance at pins 3 and 4. Limit is 210 - 260Ω. Check resistance at pins 3 and 5, and
pins 4 and 5. Limit is < 230Ω.
Step 6.
With ECL quadrant connector disconnected, check resistance of ECL quadrant at quadrant pins 1 and 2.
Limit is 35 - 40Ω. Check resistance at pins 3 and 4. Limit is 90 - 1 OOΩ.
Step 7.
With PL3 disconnected, check resistance of ECL quadrant at harness PL3 connector sockets and i (figure
h
202). Limit is 35 - 42Ω. Check resistance at sockets EE and DD. Limit is 90 - 1 00Ω. Check resistance of
RTL sensor at sockets g and p. Limit is 210 - 260Ω. Check resistance of sockets z and AA. Limit is 110 -
140Ω.
Step 8.
Before tightening PL3, ECL quadrant and LVDT connectors, be sure that keyways in harness connectors are
aligned with keyways in component connectors.
Step 13.
Refer to manufacturer's procedure for checking operation of ECL quadrant and RTL sensor.
Step 15
Refer to manufacturer's procedure for diagnosing and replacing harness, ECL quadrant or RTL sensor.
Step 17.
Refer to manufacturer's procedure for diagnosing and replacing RTL sensor.
Step 19.
Refer to manufacturer's procedure for diagnosing andreplacing ECL quadrant.
Step 23.
Refer to manufacturer's procedure for diagnosing and replacing harness.
G-75
