connect it to TB 2-19. Remove the lead connected be-
watch (B2) will be no more than 8 seconds.
tween TB 1-15 and TB 1-17. Connect a new lead between
k. Rotate XMTR 2, causing the RBP to rotate through
TB 1-15 and TB 2-18. Connect a new lead between TB
360 at a rate of approximately 2-revolutions-per-minute.
1-17 and TB 2-18.
Any sticking or binding will not cause the RBP to lag the
b. Adjust the power supply (A4) output until signal
XMTR 2 indication by more than 3 (183 including
strength indicator (M3) energizes and shows all black.
phase difference).
The multimeter (A3) will indicate no more than 22 volts.
l. Set primary power S1 to OFF.
c. Slowly reduce the power supply output until signal
14. Tests of
Steering Indicator (M1).
a. Set multimeter
strength indicator (M3) deenergizes and shows alternating
(A3) to current function.
black and red segments. The multimeter will indicate no
b. Energize the power supply (A4) and increase output
less than 0.5 volts.
until steering indicator (M1) aligns with the first dot
d. Set the power supply for a 0-volt output.
clockwise from center. The multimeter will indicate be-
17. Tests of
Compass Power Flag (M4). a. Disconnect
tween 55 and 95 a.
the leads (B1) connected to TB 2-18 and connect them to
TB 2-20. Disconnect the leads connected to TB 2-19 and
I
Gyro Signal Simulator XMTR 2
Test Instrument Radio
connect them to TB 2-21.
Indication
Bearing Pointer Indication
W
90 1, 15 minutes
b. Adjust the power supply output until compass power
N
180 01, 15 minutes
flag (M4) just begins to move toward the out-of-view
270 1, 15 minutes
E
position. The multimeter (A3) will indicate no less than
c. Continue to increase the power supply output until
20 volts.
steering indicator (M1) aligns with the second dot clock-
c. Increase the power supply output until compass
wise from center. The multimeter will indicate between
power flag (M4) is fully out of view against the stop. The
138 and 162 a.
multimeter will indicate between 32 and 40 volts.
d. Set the power supply for a 0-volt output, and reverse
d. Set the power supply for a 0-volt output.
the connections to TB 2-14 and TB 2-15.
18. Tests of
Annunciator (M5). a. Reconnect equip-
e. Adjust the power supply output until steering indica-
tor (M1) aligns with the first dot counterclockwise from
b. Disconnect lead connected to TB 2-14 and connect it
center. The multimeter will indicate between 55 and 95
to TB 2-22. Disconnect lead connected to TB 2-15 and
a.
connect it to TB 2-23.
f. Continue to increase the power output until steering
c. Set the multimeter (A3) to the current range.
indicator (M1). aligns with the second dot counterclock-
d. Adjust the power supply (A4) output until the
.
-
wise from center. The multimeter will indicate between
multimeter indicates 140 microamperes. Annunciator
138 and 162 a.
(M5) cross will not be in full view.
g. Set the power supply output for 0 volt.
e. Increase the power supply output until annunciator
15. Tests of
Station Approach Indicator (M2).
a. Dis-
(M5) cross is in full view. The multimeter will indicate be-
connect the lead (B1) connected to TB 2-14 and connect it
tween 170 and 230 a.
to TB 2-17. Disconnect the lead connected to TB 2-15 and
f. Set the power supply for a 0-volt output, and reverse
connect it to TB 2-16.
connections to TB 2-22 and TB 2-23.
b. Adjust the power supply (A4) output until station
g. Repeat d and e above.
approach indicator (M2) aligns with the center dot of the
h. Set power supply for a 0-volt output.
scale. The multimeter (A3) will indicate between 55 and
19. Final Procedure. a. Deenergize and disconnect all
95 a.
equipment.
c. Adjust the power supply output until station ap-
b. In accordance with TM 38-750, annotate and affix
proach indicator (M2) aligns with the bottom of the scale.
The multimeter will indicate between 138 and 162 a.
of the MK-994/AR. When the TI is not within the
d. Set the power supply for 0-volt output.
specified tolerances, annotate and affix DA Form 2417
16. Tests of
Signal Strength Indicator (M3). a. Discon-
(Unserviceable or Limited Use) tag and return TI to the
nect the lead (B1) connected to TB 2-16 and connect it to
depot for repair.
TB 2-19. Disconnect the lead connected to TB 2-17 and