LCT Actuator Simulator Test (CRC)

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(f) HDG Enable Indicator DS22

(g) DASH ANN Indicator DS23

(2) Connect the dc power supply between receptacle pins J l-c (+) and J1-C. Apply 28 volt dc. The

CCDA CLUTCH Indicator shall come ON. Disconnect the DC power supply.

(3) Connect the dc power supply to receptacle J1-b (+) and J1-C. Apply 28 volt dc (+). The CCDA

MAG BRAKE Indicator shall come ON. Disconnect the DC power supply.

(4) Connect the dc power supply to receptacleJ3-A (+) and Jl-C. Apply 28 volt dc. The HYD

SOLENOID Indicator shall come ON. Disconnect the DC power supply.

(5) Set the TESTER POWER switch to ON.

(6) Connect a jumper between receptacle pins J3-Z and Jl-C. The AFCS ANN indicator shall

come ON. Disconnect the jumper.

(7) Connect a jumper between receptacle pins J3-S and J1-C, The ROLL ERECT CUTOUT Indi-

cator shall come ON. Disconnect the jumper.

(8) Connect a jumper between to receptacle pins J1-V and J l-C. The HEADING ENABLE indic-

tor shall come ON. Disconnect the jumper.

(9) Connect a jumper between receptacle pins J3-Z and J l-C. The DASH ANN Indicator shall

come ON.

4-59. LCT Actuator Simulator Test (CRC). This test ensures that the actuator simulator provides

the appropriate position signal in response to a drive signal.

a. Resistance Checks (Power Disconnected). Measure the resistance between receptacle pins as

follows. Set the digital multimeter FUNCTION switch to OHMS. Set the RANGE switch to 200.

RECEPTACLE PINS

R E S I S T A N C E (OHMS)

14.4 to 17.6

(1) J1-S to J1-C

14.4 to 17.6

(2) J1-T to Jl-C

b. Null Voltage Test (Power Connected).

(1) Set TESTER POWER 115V 400 Hz switch S1 to ON.

(2) Set LCT switch S50 to NORM.

(3) Connect jumpers between receptacle pins J1-S,Jl-T, and Jl-C.

(4) Connect the multimeter, set to measure 2 Vdc, across receptacle pins J3-x (+) and J3-AA. The

multimeter shall indicate 0.1 to +0.1 volt dc.

(5) Disconnect the jumper.

c. Drift Voltage Test.

(1) Connect the dc power supply across receptacle pins J1-S (+) and J l-T.

(2) Connect the digital multimeter, set to measure 20 Vdc, across the power supply.

(3) Connect No. 2 multimeter between receptacle pins J3-x (+) and J3-AA.

(4) Adjust the power supply for +15 volt dc on No. 1 multi meter. Disconnect the power supply

when No. 2 multimeter reads about -2 volt dc.

(5) Check No. 2 multimeter. The No. 2 multimeter shall not change more than 100 mV in 10

seconds.

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