FINAL TEST (CRC).

55-4920-430-13

NOTE

Because of AFCS aircraft configuration, the relationship of the phase at

ATT synchro setting of 180 is in-phase with reference source.

l. Disconnect jumper wire from pin J3-V and connect to J3-U.

m. Check that the multimeter indicates 9.2 to 11.2 volts ac. Check that CHANNEL A and B wave-

forms are in phase.

n. If the phase requirement is not met, proceed as follows:

(1) Set the ATT synchro dial to 180.

(2) At the rear of the synchro, loosen three screws on the stator.

(3) Rotate the synchro stator 180.

(4) Repeat steps d. thru m.

(5) Disconnect multimeter and oscilloscope from test set.

(6) Set the 115V 400 Hz, and +28VDC TESTER POWER switches to OFF.

(7) Disconnect the power cable from the power source.

4-39. Installation of Panel (CRC).

a. Install the panel in the transit case.

b. Install the 18 screws around the edge of the panel. Tighten the screw until panel is secure in case.

4-40. FINAL TEST (CRC).

4-41. General.

These procedures ensure that the set meets performance standards for use, return to stock, or reissue.

These procedures are required when a test set is repaired or its performance is suspect.

4-42. Test Equipment Required. The following test equipment is required:

Specification

Function

Equipment

Vac 50 mV to 150V .5% (AC Sample)

Measure continuity, re-

Digital Multimeter (2 ea)

Vac 10 mV to 50V .1% (Rate Critical)

sistance ac and dc voltage

Measure Sine Wave

Dual Trace 0 to 100 mHz

Oscilloscope

350 Picosecond Rise Time

Insert Capacitance

0.01 to 1.0 uf

Decade Capacitance Box

1.0 to 10.0 uf

(0.1% +0.5 pf)

Insert Resistance

10 ohms to 100 ohms

Decade Resistance Box

0.5 ohms to 1.1 megohms

1 hz to 1 mHz

Measure Frequency

Frequency

Counter/Timer

Provides Test Voltage

0 to 36 vdc 0.5%

DC Power Supply (2 ea)

0 to 15 vac

Ref Volt Shift 90

Function Generator

Provides Test Voltage

0 to 115 vac .5%

AC Power Supply 400 Hz

Timer

0.1 sec min

Stop Watch

4-17