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Figure 4-2. Assemblies Removal and Replacement.
Up
TM-11-5825-270-23 Monitor Radio Frequency R-2176/FRN (NSN
Next
If. Amplifier PCB Test Procedure


TM 11-5825-270-23
Section VI. TESTING PROCEDURES
4-18. General
clockwise, TIME DELAY control A2R32 (fig. 2-1) to the
desired delay, and the RF TUNE control (fig. 2-1) to the
operating frequency (table 2-2).
This section contains test procedures that determine
(2) Set the POWER switch to ON, then
whether  the  performance  of  the  equipment  is
momentarily press the ALARM SIL switch.
satisfactory.
These tests are performed after an
(3) Rotate
the
RF
ATTEN
control
assembly has been replaced, following the replacement
counterclockwise until a reading is obtained on the
procedures in sections IV and V.
CARRIER LEVEL meter.
4-19. Test Equipment
(4) Carefully adjust the RF TUNE control to get
a maximum meter reading.
(5) Adjust
SENSITIVITY
control
A3R7
The test equipment required for the testing procedures is
counterclockwise to get a meter reading of 0 dB.
listed in table 4-1.
(6) Set CARRIER control A2R22 (fig. 2-1) to the
4-20. Performance Testing
desired threshold level. The receiver should now be in
its normal state, with the NORM indicator on and the
a. Each procedure is preceded by instructions for
ALARM indicator off.
(7) Rotate
SENSITIVITY
control
A3R7
setting up and interconnecting the applicable test
counterclockwise to reduce the meter reading to 1 dB
equipment to the equipment under test.
b. In performing the tests, follow the procedure
less than the setting of CARRIER control A2R22. After
the delay set by A2R32 the NORM indicator will go off
steps in the order given and set all controls accurately.
c. At the end of testing set the POWER switch to
and the ALARM indicator will go on.
(8) Rotate
SENSITIVITY
control
A3R7
OFF, disconnect all test equipment and restore the
clockwise to get a meter reading of 0 dB. The NORM
equipment to its normal operational configuration.
indicator will be on and the ALARM indicator will be off.
4-21. Monitor Receiver Test Procedures
(9) Perform the maintenance turn on procedure
The following list gives the test procedures required after
4-23. RF Amplifier PCB Test Procedure.
replacement of a unit or assembly. The switch bracket
test procedure is required for organizational level
a. Test Equipment and Material.
maintenance, but the switch bracket replacement is
(1) Electronic Counter Mainframe TD-1209U.
performed by direct support maintenance personnel
(2) Electronic Counter Module TD-1211/U.
(refer to chapter 5).
b. Test Connections and Conditions.
a. Monitor Receiver. Perform the post installation
(1) Connect the frequency counter to A3TP2
adjustment procedures in chapter 2.
b. Switch  Bracket  Assembly.
Perform  the
(2) The equipment should be connected in its
operational condition, with the POWER switch set to
procedure of paragraph 4-22.
c. RF Amplifier PC.  Perform the procedure of
OFF.
c. Procedure.
d. If. Amplifier PCB.  Perform the procedure of
(1)  Check that crystal Y1 (fig. 2-1) is the correct
frequency. The crystal frequency equals 4.4 MHz minus
e. Audio Amplifier PCB. Perform the procedure of
the transmitter frequency.  The crystal frequency is
marked on the top of the crystal.
f. Power  Supply  Assembly.
Perform  the
(2) Set the POWER switch to ON, then
momentarily press the ALARM SIL switch.
maintenance turn on procedure of table 4-2.
(3) Adjust A3C13 (fig. 2-1) to provide the correct
4-22. Switch Bracket Assembly Test Procedure
frequency 10 Hz.
(4) Carefully adjust the RF TUNE control (fig.
a. Test Equipment and Material. None.
2-1) to get a maximum reading on the CARRIER LEVEL
b. Test Connections and Conditions.  The equip
meter.
(5) Adjust SENSITIVITY control A3R7 (fig. 2-1)
ment should be connected in its operational condition,
to get a CARRIER LEVEL meter reading of 0 dB.
with the POWER switch set to OFF.
c. Procedure.
(6) Perform the maintenance turn on procedure
(1) Set RF ATTEN control (fig. 2-1) fully
clockwise, SENSITIVITY control A3R7 (fig. 2-1) fully
4-10


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