TM 11-6625-596-45
f.
Dynamic Microphone Test.
LINE L1 and L2 terminals on the TS-716/U front panel.
(1) Depress MICROPHONES OTHER
TYPES button 1A4S6J.
b.
Depress INSULATION RESISTANCE button
(2) Meter 1A4M4 shall read on green
1A4S6N.
scale.
c. Adjust INSULATION RESISTANCE CALI-
g.
Carbon Microphone Test.
BRATE control 1A4R13 for a CAL line reading on 1A4M1.
(1) Depress MICROPHONES CARBON
button 1A4S6K.
d. Press TEST button 1A4S5A. Meter 1A4M1
(2) Meter 1A4M1 shall read on green
shall read less than 50 for values of resistance above 1
scale.
megohm, and greater than 50 for values of resistance less
than I megohm.
h.
Telephone Efficiency-Send Test.
(1) Depress TELEPHONE EFFICIENCY-
6-15.
Continuity Test
SEND button 1A4S6R.
a. Connect a resistance decade unit to CONTI-
(2) Meter 1A4M1 shall read on green
NUITY TEST LEADS terminals 1A4E14 and 1A4E15 on the
scale.
TS-716 U front panel.
i.
Telephone Efficiency-Receive Test.
b. For resistance values less than 9 ohms, the
(1) Depress TELEPHONE EFFICIENCY-
buzzer shall sound and CONTINUITY TEST lamp DS1
RECEIVE button 1A4S6P.
shall light.
(2) Meter 1A4M1 shall read on green
scale.
c. For resistance values greater than 11 ohms,
the buzzer shall not function.
j.
Noise Generator Test.
(1) Set NOISE GENERATOR switch
d. For resistance values greater than 20 ohms,
1A4S3 to DRIVER.
the lamp shall not light.
(2) Meter 1A4M1 shall read on green
scale and the driver unit shall be audible.
6-16.
Hand Generator Test
k.
Sound Power Telephone Test.
(1) Depress
SOUND
POWER
b.
Set range selector switch on the hp vtvm to
TELEPHONE button 1A4S6H.
100 volts.
(2) Meter 1A4M1 shall read on green
scale.
c.
Set variac to zero.
(3) Press 1 LOW button 1A4S5B, meter
1A4M1 shall read approximately 80.
(4) Remove microphone from speaker
Meter 1A4M1 shall read 0.
and cover with hand.
(5) Press 1 LOW button 1A4S5B, meter
e. Adjust the variac for a CAL line reading on
1A4M1 shall read 20 or lower.
1A4M1 and note the reading on the vtvm. Vtvm shall read
approximately 50 volts.
i.
Filter Test.
(1) Depress
EARPHONES
button
f.
Disconnect the variac.
1A4S6G.
(2) Sequentially press 1 LOW, 2
6-17.
Ringer Test
CENTER, and 3 HIGH buttons 1A4S5B, C, and D.
a. Connect the vtvm to TEL LINE L1 and L2
(3) Meter 1A4M1 shall read on green
terminals.
scale as each button is depressed.
(4) Depress 4 NARROW BAND button
b. Depress RINGER 2400 button 1A4S6C switch.
1A4S5E.
The buzz of the 20-Hertz inverter shall be audible.
(5) Meter 1A4M1 shall read between 40
and 50.
c. Meter 1A4M1 shall read greater than 30 and
the vtvm shall read greater than 50 volts.
6-14.
Insulation Resistance Test
a. Connect a decade resistance box to TEL
d. Repeat b and c above, pressing RINGER 5300
button 1A4S6D and 12000 RINGER button 1A4S6E
6-5
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