TM 11-6625-2398-15-2
Section III. COMPONENT TESTING
(a) Set controls on interface adapter unit 1A1A1 as
6-8. Group 1 Component Testing
follows:
a. General. Testing of the group 1 components
Control
Position
consists
primarily
of
voltage
and
AZIMUTH DATA FREQ SELECT .............. 60 HZ
measurements. Components in group 1, are tested on a
AZIMUTH DATA SYNC/RSLVR ................ SYNC
functional basis. These functions are as follows:
GROUP CASE POWER 60 Hz ................ ON
(1) Group case power.
GROUP CASE POWER SELECT ............. 60 HZ
(2) Power.
POWER 60 Hz ........................................... ON
(3) Antenna and azimuth data.
POWER FREQUENCY SELECT............... 60 HZ
(4) Interconnection.
ANT ROTATION ........................................ STA
RPM CONTROL ........................................ 0
b. Group Case Power Circuit (fig.
6-1).
The
following test equipment is required to test group case
CAUTION
power circuit components: Multimeter TS-352B / U,
Oscilloscope AN / USM-218A.
Before connecting test equipment place all
CAUTION
GROUP CASE POWER AND POWER
switches to their OFF positions.
Insert
Before connecting test equipment place all
GROUP CASE POWER AND POWER
connector pins which will be monitored.
switches to their OFF positions.
Insert
Connect test equipment and set the GROUP
CASE POWER and POWER switches to the
connector pins which will be monitored.
applicable positions.
(1) Connect interface adapter unit 1A1A1 to a 115
vac 11.5 vac, 60-Hz power source.
(b) Check that GROUP CASE POWER ON
(2) Set multimeter to 250 vac scale and connect to
indicator 1A1A1DS1 is lighted.
GROUP CASE POWER OUT jack-1A1A1J11-A and
(c) Check that POWER ON indicator lamp
1A1A1J11-B.
1A1A1DS3 is lighted.
(3) Set GROUP CASE POWER 60-Hz circuit
(d) Connect multimeter set to 250 vac scale,
breaker 1A1A1CB1 to ON position.
between 1A1A1J10 -W and -X.
(4) Set GROUP CASE POWER SELECT switch
(e) Check that multimeter indicates 115 vac 11.5
1A1A1S1 to 60-Hz position.
vac.
(5) GROUP CASE POWER ON indicator
(f) Set AZIMUTH DATA SYNC / RSLVR 1A1A1S5
1A1A1DS1 should be lighted, and should indicate 115
to
RSLVR position,
set AZIMUTH DATA FREQ
vac 11.5 vac.
SELECT switch to 4000 Hz, and check that multimeter
(6) Replace multimeter with oscilloscope and
indicates 26 vrms.
check for 60-Hz sinewave.
(g) Set GROUP CASE POWER 60-Hz circuit
(7) Set GROUP CASE POWER 60 Hz circuit
breaker 1A1A1CB1 to OFF, and check 11 indicator
breaker 1A1A1CB1 to OFF position.
lamps are off.
(8) Set GROUP CASE POWER SELECT switch
(h) Set GROUP CASE POWER SELECT 1A1A1S1
1A1A1S1 to 400-Hz position.
to 400 Hz.
(9) Connect interface adapter unit to a 115 vac
(i) Set POWER 60-Hz circuit breaker 1A1A1CB3
11.5 vac, 400-Hz power source.
to OFF.
(10) Set GROUP CASE POWER 400 Hz circuit
(j) Set POWER 400-HZ circuit breaker 1A1A1CB4
breaker 1A1A1CB2 to ON position.
to ON.
(11) Check for a 115 vac 11.5 vac, 400-Hz
(k) Connect interface adapter unit 1A1A1 5 vac
sinewave on oscilloscope.
11.5 vac, 400-Hz power source.
c. Power Circuit (fig. 6-1).
(I) Set POWER FREQUENCY SELECT switch
(1) Test equipment and materials. The following
1A1A1S4 to 400-Hz position.
test equipment is required: Multimeter S-352B / U.
(m) Set GROUP CASE POWER 400-Hz circuit
(2) Procedure.
Connect interface adapter unit
breaker 1A1A1CB2 to ON.
1A1A1 to a 115 vac 11.5 vac, 60-Hz power source.
(n) Check that multimeter indicates 26 vrms 2.6
vrms.
(o) Repeat
(b)
(c)
steps
and
above.
6-11
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