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 TM 11-6625-601-34
(3) Remove the hexagonal nut and washer
2-15. Removal and Replacement of SQUELCH
that secure switch S8 to the test set chassis.
Switch S7 (located in TS-1967/
(4) Remove switch S8.
ARC-54)
b. Replace switch S8 as follows:
(1) Secure switch (31) to chassis with hex-
as follows:
agonal nut and washer.
(1) Remove switch knob by removing two
(2) Solder all wires to switch S8 as indicated
Allen screws from the knob.
by tag.
(2) Tag and unsolder all wires connected to
(3) Replace knob and tighten two Allen
switch S7 (30).
screws.
(3) Remove the hexagonal nut and washer
that secure switch S7 to the test set chassis.
2-17. Removal and Replacement of Indicator
(4) Remove switch S7.
ID-48/ARN (Located in TS-1967/
b. Replace switch S7 as follows:
ARC-54).
(1) Secure switch S7 (30) to chassis with
hexagonal nut and washer.
(2) Solder all wires to switch S7 as indicated
as follows:
by tags.
(1) Disconnect the two plugs (1 and 2) from
(3) Replace knob and tighten two Allen
t h e i r respective jacks at the back of the
screws.
indicator (4).
(2) Remove the three screws (3) that secure
2-16. Removal and Replacement of TONE
the indicator to the test set front panel.
SECURITY Switch S8 (Located in
(3) Carefully pull the indicator forward
TS-1967/ARC-54)
until it is clear of the front panel.
212 (l) as follows:
b. Replace the indicator as follows:
(1) Remove switch knob by removing two
(1) Place indicator (4) in panel and replace
Allen screws from the knob.
three screws (3) through indicator and panel.
(2) Connect the two plugs (1 and 2) to their
(2) Tag and unsolder all wires connected to
switch S8 (31).
respective jacks at the back of the indicator.
Section IV. ADJUSTMENT
Test Equipment
Technical
Manual
2-18. General
TM 11-6625-320-12
Voltmeter, Electronic ME-30A/U
Whenever Audio Amplifier A1 (located in
Adapter, TYPE N (female to female),
TS-1967/ARC-54) or Audio Amplifier A1
UG-29A/U
(located in SM-349/ARC-54) is replaced, adjust-
Adapter, Type N to BNC, UG-201/U
(2 required)
ment at the direct support level is necessary.
The procedures for adjustment of these
b. To gain access to the interior of the test
amplifiers and test equipment necessary for
set remove 10 screws from around the edge of
adjustment follow in this section.
the front panel and slide the test set from the
lower case; use the two handles. To gain access
219. Test Equipment and Special ToolS
to the interior of the simulator, remove it from
Required for Adjustment
the test set and remove the light screws that
secure the metal cover to the simulator chassis.
C a r e f u l l y remove the metal cover from the
adjusting Maintenance Kit, Electronic Equip-
simulator.
ment MK733/ARC-54. Included in the table are
the associated technical manuals.
2-20. Adjustment Procedure for Audio
Table 2-4. Test Equipment for Direct Support Adjustments
Amplifier A1 (Located in TS-1967/
ARC-54)
Technical
Manual
Test Equipment
TM
11-6625-683-15
Generator, Signal AN/URM-127
a. Apply +27.5 volts dc to POWER jack J32.
TM
11-6625-366-15
Multimeter TS-352B/U
b. Set the test set front panel controls as fol-
TM
11-5821-244-12
Radio Set AN/ARC-54
lows:
TM
11-6625-446-12
Wattmeter AN/URM-120
2-19
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