Fixed-Level Analog Signal Circuit Troubleshooting.

TM 55-4920-430-13

NOTE

Page identification for foldout pages has been designated as FO-1, FO-2, etc. and the pages are placed in the back of the

manual at time of printing. Upon receipt of this manual, insert foldout pages FO-2 through FO-54 after page 4-2.

4-8. Fixed-Level Analog Signal Circuit Troubleshooting.

Isolate fault to receptacles, card connector, ANALOG SIGNAL switches, wiring, or circuit card A3.

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

4-9. Control Positions Transducer Signal Circuit Troubleshooting.

Isolate fault to receptacles, card connector, ANALOG SIGNAL switches, wiring, or circuit card A5.

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

4-10. Heading and Attitude Variable Analog Signal Circuit Troubleshooting.

Isolate fault to receptacle, connector, ATT controls and switches, wiring or circuit card A5. Repair or

replace as required. Refer to FO-1, sheets 1 and 2, and FO-55.

4-11. Radar Altitude Self Test Analog and Confidence Signal Circuit Troubleshooting.

Isolate fault to receptacle J3, plug A5 P18, BARO ALT switch S41, wiring, or circuit card A5. Repair

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

4-12. Pitch, Roll, and Yaw ILCA Simulation Resistance Circuit Troubleshooting.

Isolate fault to receptacle J1, plug A1P14, wiring, or circuit card A1. Repair or replace as required.

Refer to FO-1, sheets 3 and 4, fig. 1-4, 1-5, 1-6, and FO-55.

4-13. Pitch ILCA Simulator Performance Circuit Troubleshooting.

Isolate fault to receptacle J1, plug A1P14, ILCA SIMULATION PITCH switch S42, wiring, or circuit

card A1. Repair or replace as required. Refer to FO-1, sheets 1 thru 4, fig. 1-4, and FO-55.

4-14. Roll ILCA Simulator Performance Circuit Troubleshooting.

Isolate fault to receptacle 1, plug A1P14, ILCA SIMULATION ROLL switch S43, wiring, or circuit

card A1. Repair or replace as required. Refer to FO-1, sheets 1 thru 4, fig. 1-5, and FO-55.

4-15. Yaw ILCA Simulator Performance Circuit Troubleshooting.

Isolate fault to receptacle J1, plug A1P14, ILCA SIMULATION YAW switch S44, wiring, or circuit

card A1. Repair or replace as required. Refer to FO-1, sheets 1 thru 4, fig. 1-6, and FO-55.

4-16. Components Interface Output Logic Discrete Signal Circuit Troubleshooting.

Isolate fault to receptacles, plugs A3P16, A5P18, DISCRETE SIGNALS switches, wiring or circuit

cards A3, A5. Repair or replace as required. Refer to FO-1, sheets 1 thru 4, and FO-55.

4-17. Component Interface Input Logic Discrete Signal Circuit Troubleshooting.

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

Isolate fault to receptacles, terminal boards, wiring or resistors. Repair or replace as required.

Refer to FO-1, sheet 3, and FO-55.

b. One indicator light does not come on when lamps are installed.

Isolate fault to receptacle, lamps, lampholder, wiring, or terminal boards. Repair or replace as re-

quired. Refer to FO-1, sheet 3, and FO-55.

4-2