LCT Actuator Simulator Circuit Troubleshooting.

TM 55-4920-430-13

4-18. LCT Actuator Simulator Circuit Troubleshooting.

a. Resistance measurement is not within tolerance or is infinity.

Isolate fault to receptacle J1 or J3, plug A2P15, LCT switch S50, wiring or circuit card A2. Repair

or replace as required. Refer to FO-1, sheets 1 thru 4, fig. 1-7, and FO-55.

b. Multimeter does not indicate correct voltage or does not indicate a null.

Isolate fault to receptacle J1 or J3, plug A2P15, LCT switch S50, wiring or circuit card A2. Repair

or replace as required. Refer to FO-1, sheets 1 thru 4, fig. 1-7, and FO-55.

4-19. CCDA Actuator Simulator Circuit Troubleshooting.

a. Resistance measurement not within tolerance or is infinity.

Isolate fault to receptacle J1 or J3, plug A2P15, wiring or circuit card A2. Repair or replace as re-

quired. Refer to FO-1, sheet 1 thru 4, fig. 1-8, and FO-55.

b. Improper voltages indicated on multimeter when voltage measurements are made at receptacle J3.

Isolate fault to receptacle J3, plug A2P15, CCDA switch S49, wiring or circuit card A2. Repair or

replace as required. Refer to FO-1, sheets 1 thru 4, fig. 1-8, and FO-55.

4-20. DASH Actuator Simulator Circuit Troubleshooting.

Isolate fault to receptacle J3, plug A2P15, ACTUATOR SIMULATION DASH switch S51, wiring or

circuit card A2. Repair or replace as required. Refer to FO-1, sheets 1 thru 4, fig. 1-9, and FO-55.

4-21. Control Panel Simulation Circuit Troubleshooting.

Isolate fault to receptacle J1 or J3, plug A3P16, CONTROL PANEL SIMULATION switches AFCS

S10, HEADING S11, BARO S64 and RADAR S12 and indicator lights AFCS DS11, HEADING DS12,

BARO DS13, RADAR DS14, wiring or circuit card A3. Repair or replace as required. Refer to FO-1,

sheet 2, and FO-55.

4-22. Built- In-Test Equipment (BITE) Circuit Troubleshooting.

Isolate fault to receptacle J2 or J3, BITE INITIATE switch S36, BITE CONTROL switch S37 or wir-

ing. Repair or replace as required. Refer to FO-1, sheet 2, and FO-55.

4-23. Response Test Circuit Troubleshooting.

Isolate fault to receptacle J3, plug A4P17, RESPONSE TEST switches MODE S8, TIME DELAY SEC

S9, STIM S7, AC/DC voltmeter, M2 CIRCUIT SELECT switches S17, S18, S19 and S20, wiring or cir-

cuit card A4. Repair or replace as required. Refer to FO-1, sheet 1 thru 4, fig. 1-10, sheets 1 thru 3,

4-24. Continuity Test Circuit Troubleshooting.

Isolate fault to receptacles J1, J3, J4, or J5, plugs A3P16, or A5P18, continuity test switches S13 and

S14, indicator light DS15, NORMAL ACCEL J2-52 switch S21, wiring or circuit cards A3 or A5.

Repair or replace as required. Refer to FO-1, sheet 1 thru 4, fig. 1-10, sheets 1 and 2, 1-12, sheets 1

and 2, and FO-55.

4-25. CCDA Test Circuits Troubleshooting.

Isolate fault to receptacle J6, plug A5P18, CCDA switches BRAKE S39, CLUTCH S40, CMD S38 or

ATT SELECT switch S35, ATT synchro B1, CIRCUIT SELECT switches S17, S18, S19 or S20, wiring,

or circuit card A5. Repair or replace as required. Refer to FO-1, sheets 1 thru 4, fig. 1-12, sheets 1

and 2, and FO-55.

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