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Table 4-2. Troubleshooting Procedures - continued - TM-9-4931-363-14-P0099
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TM-9-4931-363-14-P Fire Control Subsystem Test Set AN/GSM-249 P/N 2201736-05 Manual
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Table 4-3. Resistance and Voltage Checks
TM 9-4931-363-14&P
Component
4-8. Resistance and Voltage Checks.
or circuit card
Applicable
connector
a. Scope of Table 4-3. Table 4-3 provides detailed
resistance and voltage checks that may be made in any area
of suspected malfunction. Any part of table 4-3 may be
Helmet sight subsystem (J1)
205212,332
performed alone, and the steps may be performed in any
sequence desired. If a fully detailed checkout of the test set
Helmet sight assembly (J4)
22,24,25
is desired, the entire test may be performed.
Linkage assemblies (J5 & J15)
166197
b. Multimeter Connections. Readings identified by an
asterisk can be read directly on the test set multimeter
Boresighting signals (J1)
131134
without external connections. Other readings can be made
by connecting leads from an external multimeter to the
EIA (J1 & J2) input test signals
3563
connector pins indicated in the "From" and "To" columns
during EIA and HSS tests
of the table.
EIA input power (Jl)
21,23,2729,
c. Values of V1 through V10. The voltage values for V1
7779,2-1,202
through V10 will be as calculated and recorded in the
divider network adjustment table in Section VI. The step
Monitor circuits for EIA
257-262,264,266,
numbers in the table that provide the calculations for V1
dc voltages (Jl)
268,270
through V10 are in corresponding order, as follows:
Monitor circuits for EIA ac
26,65,7076
voltages (J1 & J2)
Step numbers of
divider network
Grounds (Jl, J4, J6, J7, J8, J9,
1-20,64,
149,
165,
Voltage
adjustment table
J10, METER blk)
203,304
Buffer amplifier (J1 & J2)
80-130,153163
V1
1
V2
2
Buffer amplifier modules (J 10)
V3
3
79, 135, 148
V4
4
V5
5
Sequencer card (J7)
150152,164,
V6
6
272286
V7
7
V8
8
Logic card (J8)
213245,305,
V9
9
308310
Vl0
10
Comparator card (J9)
3234,247256
d. Using Table 4-3. In using any part of table 4-3, the
Power supply card output
263,265,267,269,
areas of suspected malfunction can be identified by the
monitor circuit (J6)
271
connector pin information. For example, if the test set
passes the self-test and yet indicates a failure for a
Power supply card input and
287289,291298
replacement sequencer card, use the portion of table 4-3
other voltages (J6)
306,307
that checks the pins of J7. If the correct indications occur,
the problem is not in the test set. If a faulty indication is
Amplifier card (J9)
300303,311331
found, it will be on the circuit identified by the pin under
test. Use the schematic diagrams, functional diagrams, and
Amplifier card setup voltage
30,31
locator views as necessary to trace the circuit and locate the
to test jacks
faulty connection or component. A list of the applicable
steps and connectors for components or circuits that are
Power supply logic voltages
198200,204,246,
tested in table 4-3 is as follows:
290,299

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