1.
Switch No. 1
5.
Switch No. 5
9.
Milliammeter
2.
Switch No. 2
6.
Fixed Resistor
10.
Ten-Pin Receptacle
3.
Switch No. 3
7.
Four-Pin Receptacle
11.
Frequency Meter
4.
Rheostat
8.
Fixed Resistor
12.
Fixed Capacitor
Figure 4-2. Panel Assembly, Rear View
Connect lead 47B7489 to the 4-pin receptacle in the
CAUTION
tester and the receptacle end of the lead shall be
connected to the 4-pin plug of lead 47D7493. Connect
Amplifier
connection
must
be
lead 47B7488 to the 10-pin receptacle in the tester and
disconnected to prevent short
the receptacle end of this shall be connected to the 10-
circuit.
pin plug of lead 47D7493.
(2) TEST PROCEDURE.
(e) Disconnect the planes 17-pin plug
from the S-3 ( ) directional gyro receptacle and connect
(a) Turn switch no. 1 to the "FLUX
the 17-pin plug of 47D7493 to the S-3 ( ) directional gyro
VALVE CHECK" position, switch no.
3 to the
receptacle. Connect the planes' 17-pin plug to the 17-
"CALIBRATE" position; and bring the adjusting stop of
pin plug of lead 47D7493.
switch no. 4 to bear on the knob in its extreme
counterclockwise position.
CAUTION
(b) Turn switch no. 4 until the pointer of
Do not connect amplifier.
the milliammeter deflects to 150 volts. Return switch
no. 4 to the "OFF" position leaving adjusting stop in the
(f) Turn switch no. 3 to "CALIBRATE"
position established by the knob where it shall remain
position and set the "adjusting" stop of switch no. 4 to a
for the remainder of this test.
position where the pointer of the milliammeter deflects
to 150 volts. Return switch no. 4 to the "OFF" position
(c) To check the exciter coil of the
leaving the adjusting stop in the position established by
transmitter, turn switch no. 3 to the "EXCITER" position
the knob setting where it shall remain for the remainder
and turn switch no. 4 against the stop. The pointer of
of this test. Turn switch no. 3 to the "A" position and
the milliammeter shall fall within the portion of the scale
turn switch no. 4 against stop. Repeat this operation for
arc marked "EXCITER." Return switch no. 4 to the
positions "B" and "C." The pointer of the milliammeter
"OFF" position.
shall fall within the portion of the scale arc marked "A-B-
C." Any opens or shorts in the transmitter will cause
(d) Disconnect cable 47B7492 from the
system.
13
Previous Page
