TM 11-5840-281-35/1
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
Seals on both Control-Indi-
3----------------------------------- None
-----------------------
Inspect seals on rear cover of
cators C-6988/TPN-18
Control-Indicators C-6988/
rear covers are resilient,
TPN-18.
properly installed, and
provide good seal when
covers are installed in
place.
a.
a. Rotating coil amplifier
4----------------------------------- None
-----------------------
Inspect interiors of Control-
Indicators C-6988/TPN-18
and mixer amplifier
for proper installation of as-
properly installed and
semblies and circuit cards.
secured in rear. 12v, 18v,
and 35v voltage regula-
tors and fixed coil ampli-
fier properly installed in
Power Supply PP-3383/
TPN-8.
5------------------------------------------
-----------------------
a. Inspect all switches,
a. Switches, controls,
controls,
meters, fuseholders and
meters, fuseholders, and
testpoints are properly
test-
mounted and tight.
b. All fuses are correct size,
points for proper mounting
and
voltage rating, and am-
tightness.
pere rating.
6----------------------------------- None
-----------------------
b. Inspect fuses for correct
a. None.
size
and ratings (as marked on
equipment).
b.
All circuit cards properly
a. Loosen two front panel
installed in correct slot.
screws
c.
Relays properly installed
and pull out Pulse Generators
and cable connectors
O-1333/TPN-18.
tight.
b. Inspect for proper
d.
Pulse Generator 0-1333/
installation
TPN-18 slides in freely
of circuit cards.
and two front panel
c. At left side, inspect relays
screws are serviceable.
for
proper seating and cable con-
nectors for tightness.
d. Push in Pulse Generator
O-1333/TPN-18 and secure
with
two front panel screws.
NOTE. Do not replace rear
cover on Control-Indicators C-
6988/
TPN-18 until tests are
completed.
ferential voltmeter).
4-16.
Testing Control-Indicator
b. Equipment Conditions.
C-6988/TPN-18 Dc Voltage
(1) Radar Set AN/TPN-18 turned on and
Supplies
aligned.
a.
Test Equipment and Materials Required.
(2) Rear cover removed from Control-Indica-
(1) Multimeter ME-26A/U (vtvm).
tors C-6988/TPN-18.
(2) Electronic Voltmeter ME-202A/U (dif-
c.
Procedure
Control settings
Step No.
Test equipment
Equipment under test
Test procedure
Performance standard
1 Differential voltmeter Radar Receiver-
a. On Control-Indicator C-6988/
a.
None.
Transmitter RT-818/
TPN-18 under test, connect
POWER:ON
b.
test lead between (-) terminal
TPN-18 control panel
None.
on differential voltmeter and
MAIN POWER:ON
GRD testpoint TP3401 on 35v
Master Control-Indicator
voltage regulator.
C-6988/TPN-18
b. Connect test lead between
TRANSMITTER:OFF
positive (+) terminal on
POWER:ON
differential voltmeter and -35V
testpoint TP3402 on 35v
voltage regulator.
4-32
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