Perform the following on power supply

Align azimuth angle data resolver on radar set AN/FPN-40.

a. Perform the following on the control monitor C-2124/FPN-33 (Figure

9).

(1) Place REMOTE-LOCAL switch to LOCAL.

(2) Place SEARCH-PREC-HF switch to PREC.

(3) Place SCAN switch to ON until the precision mechanism engages.

(4) Place SCAN switch to OFF.

(5) Place the following antenna circuit breakers to OFF.

(a) Actuator CB-4209.

(b) POS motor CB-4208.

b. Perform the following on power supply PP-2489/FPN (Figure 8).

(1) Depress HIGH VOLTAGE OFF button on PP-2489/FPN (Figure 8).

(2) Rotate precision handwheel (Figure 50) to position azimuth

antenna AS-1079/FPN-40 to 0 as indicated by the dial scale (Figure 16).

(3) Connect the vertical input of an oscilloscope to the S1 terminal

of the azimuth angle data resolver (B-3405)(Figure 67). Observe the 1500 hz

(CPS) sine wave (Figure 44).

(4) Loosen retaining clamps on the azimuth angle data resolver (B-

3405) (Figure 67).

(5) Rotate the azimuth angle data resolver for minimum amplitude of

the sine wave on the oscilloscope.

(6) Tighten clamps on the azimuth angle data resolver (B-3405) and

check the sine wave for minimum amplitude on oscilloscope.

NOTES:

Only with the following conditions met will the azimuth angle

data resolver (B-3405) be properly aligned.

Azimuth antenna AS-1079/FPN-40 at 0.

The clamps on B-3405 are tightened.