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Section VI. EIA TEST THEORY
Up
TM-9-4931-363-14-P Fire Control Subsystem Test Set AN/GSM-249 P/N 2201736-05 Manual
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EIA Test Theory. - continued - TM-9-4931-363-14-P0036
TM 9-4931-363-14&P
k. Refer to step 10 in figure 2-6 and in the EIA test
14) to the meter and to the A2 card. (Jl-t is not connected
in the EIA from XM128.)
table. Setting S8 to position 8 connects 18 volts from the
EIA through J2-a to the meter in the test set.
u. Refer to step 20 in figure 2-6 and in the EIA test
l. Refer to step 11 in figure 2-6 and in the EIA test
table. Test signal Gi from the EIA (from XMl36) is
table. Setting S8 to position 9 connects 12 volts from the
connected through EIA J1-u, J2-B of the test set, contact 8
EIA through J2-X to the meter in the test set.
and wiper 1 of S3-K, and the contacts described in o (step
14) to the meter and to the A2 card. (J1-u is not connected
m. Refer to step 12 in figure 2-6 and in the EIA test
in the EIA from XM128.)
table. Setting S8 to position 10 connects 5 volts from the
EIA through J2-Y to the meter in the test set.
v. Refer to step 21 in figure 2-6 and in the EIA test
table. The output of T3-1, the pilot ac reticle output, is
n. Refer to step 13 in figure 2-6 and in the EIA test
connected through J1-d, through J1-EE, through contact 9
table. Setting S8 to position 11 connects -6 volts from the
and wiper 1 of S3-K, and through the contacts described in
EIA through J2-Z to the meter in the test set.
o (step 14) to the meter and to the A2 card. R26 in the test
set simulates the parallel load of the three lamps in a typical
o. Refer to step 14 in figure 2-6 and in the EIA test
pilot reticle lamp assembly.
table. The output of T2-1 in the EIA is connected through
J2-A, through J1-i, through contact 2 and wiper 1 of S3-K,
w. Refer to step 22 in figure 2-6 and in the EIA test
through contact 3 and wiper 1 of S4-H, through contacts 1
table. The output of T3-4, the gunner ac reticle output, is
and 3 of S9 set to position R3, and through contact 2 and
connected through J1-e, through J1-HH, through contact
wiper 1 of S5-A to the meter, and through contact 8 and
10 and wiper 1 of S3-K, and through the contacts described
wiper 2 of S5-A to the phase-determining input of card A2
in o (step 14) to the meter and to the A2 card. R25 in the
at XA2-41.
test set simulates the parallel load of the three lamps in a
typical gunner reticle lamp assembly.
p. Refer to step 15 in figure 2-6 and in the EIA test
table. The output of T2-4 in the EIA is connected through
x. Refer to step 23 in figure 2-6 and in the EIA test
J2-B, through J1-j, through contact 3 and wiper 1 of S3-K,
table. Test signal Gj from the EIA (from XM136) is
and through the contacts described above to the meter and
connected through EIA J1-v, J2-b of the test set, contact
to the A2 card.
11 and wiper 1 of S3-K, and the contacts described in o
(step 14) to the meter and to the A2 card. (Jl-v is not
q. Refer to step 16 in figure 2-6 and in the EIA test
connected in the EIA from XM128.)
table. Test signal A (test signal Pj) in the EIA is connected
through J2-C, through J1-k, through contact 4 and wiper 1
of S3-K, and through the contacts described in o (step 14)
y. Refer to step 24 in figure 2-6 and in the EIA test
to the meter and to the A2 card.
table. The 5 volts ac, phase angle 0 degrees, is connected
through wiper 1 and contact 4 of S4-F, through wiper 1
r. Refer to step 17 in figure 2-6 and in the EIA test
and contact 10 of S3-C, through J1-a, and through J1-BB to
table. Test signal B (test signal Pi) in the EIA is connected
the in-phase end of variable resistors R1 through R4 in the
through J2-D, through J1-m, through contact 5 and wiper 1
EIA. The 5 volts ac, phase angle 180 degrees, is connected
of S3-K, and through the contacts described in o (step 14)
through wiper 1 and contact 4 of 84-G, through wiper 1
to the meter and to the A2 card.
and contact 10 of S3-D, through J1-b, and through J1-CC
to the out-of-phase end of variable resistors R1 through R4
s. Refer to step 18 in figure 2-6 and in the EIA test
in the EIA. The gunner azimuth error signal output from
table. Test signal C (test signal TR) in the EIA is connected
the A13 card in the EIA is connected through J1-P, through
through J2-E, through J1-n, through contact 6 and wiper 1
J1-P in the test set, through contacts 5 and 6 of S9 set to
of S3-K, and through the contacts described in o (step 14)
position R2, and through contact 3 and wiper 1 of S5-A
to the meter and to the A2 card.
and TB1-3 to the meter, and through contact 9 and wiper 2
of S5-A to XA2-41. With no input signal to the A13 card
from the linkage, R2 is adjusted for a null. (The inputs to
t. Refer to step 19 in figure 2-6 and in the EIA test
amplifier card Al3 in the EIA are grounded through EIA
table. Test signal Gk from the EIA (from XM136) is
J3-43 and J4-39 to insure that the readout is not affected
connected through EIA J1-t, J2-A of the test set, contact 7
by these inputs during this zeroing.)
and wiper 1 of S3-K, and the contacts described in o (step
2-19

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