Resistance and Voltage Checks.

TM 9-4931-363-14&P

Component

4-8. Resistance and Voltage Checks.

or circuit card

Applicable

connector

steps of table 4-3

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

Buffer amplifier modules (J 10)

79, 135, 148

Sequencer card (J7)

150152,164,

272286

Logic card (J8)

213245,305,

308310

Vl0

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

4-10