TM 11-6625-2398-15-2
multimeter swings from 0 to 90 10 vac. Check
CAUTION
POSITION DEGREES dials are rotating.
Before connecting test equipment, place all
that GROUP CASE POWER and POWER
(f) Repeat steps (c)and (d) above for RPM TROL
switches to their OFF positions.
Insert
transformer 1A1A1T1 settings of 10, 15, 20 and 25 RPM.
insulated extender pins (para 6-2e) over
(g) Set ANT ROTATION switch 1A1A1S3 to STA
connector pins which will be monitored.
position and check that meter indication is less than 5
Connect test equipment and set the
vac.
GROUP CASE POWER and POWER switches
(h) Set ANT ROTATION switch to CCW position..
to the applicable positions.
(i) Repeat steps (c) through (f) above.
(c) Connect multimeter, set to 250 vac scale
(j) Connect multimeter to 1A1A1J10 -W and -X
between RADAR AZ jack 1AA1J10-P and -T and check
and check for 115 vac 11.5 vac.
that multimeter swings from 0 to 90 vac 10 vac. Check
f. Antenna and Azimuth 4000-Hz Data Circuit.
that POSITION DEGREES dials are rotating.
(1) Test equipment and material. The following
(d) Remove multimeter lead from 1A1A1J10-P and
test equipment is required: Multimeter TS-352B / U.
connect to 1A1A1J10-R and check that multimeter
swings from 0 to 90 + 10 vac. Check that POSITION
(2) Procedure.
DEGREES dials are rotating.
(a) Connect interface adapter unit 1A1A1
controls to a 15 vac 11.5 vac, 60-Hz power source.
(e) Remove multimeter leads and connect between
1A1A1J10 -R and -T and check that
(b) Set interface adapter unit 1A1A1 controls
to position below.
Control
Position
AZIMUTH DATA FREQ SELECT switch 1A1A1S5 ........................................................4000 HZ
AZIMUTH DATA SYNC/RSLVR SEL switch 1A1A1S6 ..................................................RSLVR
GROUP CASE POWER 60-HZ circuit breaker 1A1A1CB1 ...........................................ON
GROUP CASE POWER select switch 1A1A1S1 ...........................................................60 HZ
POWER 60-HZ circuit breaker 1A1A1CB3 ....................................................................ON
POWER FREQUENCY SELECT switch 1A1A1S4 ........................................................60 HZ
ANT ROTATION switch 1A1A1S3..................................................................................CW
RPM CONTROL transformer 1A1A1T1..........................................................................5
CAUTION
(f) Set ANT ROTATION switch 1A1A1S3 to STA
Before connecting test equipment, place all
position and check that multimeter indication is less than
GROUP CASE POWER and POWER switches
5 vac.
to their OFF positions.
Insert insulated
(g) Set ANT ROTATION switch to CCW.
pins which will be monitored. Connect test
(h) Repeat steps (c) through (e) above.
equipment and set the GROUP CASE POWER
(i) Connect multimeter to 1A1A1J10 -W and check
and POWER switches to the applicable
for 26 vac 2.6 vac.
positions.
(j) Set all interface adapter unit 1A1A1 controls to
OFF.
(c) Connect multimeter, set to 50 vac scale,
g. Interconnections. Testing of the test facilities
between RADAR AZ jack 1A1A1J10 -P and -R and
set interconnection requires continuity checks for cables
check that multimeter swings from 1.5 to 26 vac 2.6
and connectors and insulation resistance test for cables.
vac.
Check that POSITION DEGREES dials are
When a cable or connector of the test facilities set is
rotating.
suspected as a source of trouble, perform standard
(d) Connect multimeter leads between 1A1A1J10 -
continuity checks for cables using applicable cable
T and -U and check that multimeter swings from 1.5 vac
to 26 2.6 vac. Check that POSITION DEGREES dials
run list (app.
A) for point-to-point wiring of the
connectors. Insulation resistance tests on cables can
are rotating.
also be performed using a megger. When performing
(e) Repeat steps (c) and (d) above for RPM
insulation resistance tests, a meter reading of 100
CONTROL transformer 1A1A1T1 settings of 10, 15, 20
megohms or larger must be obtained.
and 25 RPM.
6-13
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