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Section IV. MAINTENANCE OF ANTENNA
Up
TM-11-5825-270-23 Monitor Radio Frequency R-2176/FRN (NSN
Next
Figure 4-2. Assemblies Removal and Replacement.


TM 11-5825-270-23
b. Replacement.
4-10. Removal and Replacement of Antenna
(1) Replace the antenna by reversing the
procedures in a above.
a. Removal
(1) Remove the antenna cable from J1 at the
(2) Perform the maintenance turn on procedure
rear of the monitor receiver.
(2) Remove the mounting hardware securing
the antenna.
Section V. MAINTENANCE OF MONITOR RECEIVER
a. Removal
4-11. General
(1) Loosen, but do not remove, eight screws
a. This section provides instructions for performing
securing the fanning strip to A1TB1 (9).
(2) Remove four screws (2) securing the audio
the maintenance functions allocated to organizational
amplifier PCB (8).
maintenance for the monitor receiver.
b. Replacement.
b. A supporting illustration is provided to aid in the
(1) Replace  the  audio  amplifier  PCB  by
performance of the procedures.
The numbers in
reversing the procedures in a above.
parentheses referenced in the text (e.g., (1), (2), etc.))
(2) Perform the test procedure of paragraph
correspond to the item callouts in the illustration.
c. Following  a  replacement  procedure,  the
appropriate test procedures of section VI must be
4-16. Removal and Replacement of RF and If.
performed  to  make  sure  that  repair  has  been
Amplifier PCB's
successfully  accomplished.
The  applicable  test
procedures  are  referenced  at  the  end  of  each
replacement procedure. The order of the replacement
a. Removal
procedures is:
(1) Remove screws (2) holding the PCB (15 or
(1) Monitor receiver.
10) to the mounting posts (16). Note that RF PCB is
(2) Audio amplifier PCB A1.
secured by three screws (2) and If. PCB is secured by
(3) If. amplifier PCB A2 and rf PCB A3.
two screws (2).
(4) Power supply assembly A4.
(2) Pull the PCB straight out until the PCB
4-12. Tools and Test Equipment Required
connector (11) clears the frame connector (12).
b. Replacement.
(1) Replace  the  PCB  by  reversing  the
Refer to table 4-1 for special tools and equipment.
procedures in a above.
There are no special tools required to perform the
(2) If the rf amplifier was replaced perform the
replacement procedures.
test procedures of paragraph 4-23. If the if. amplifier
4-13. Precautions
was replaced perform the test procedure of paragraph
Prior to performing any replacement procedure make
4-17. Removal and Replacement of Power Supply
sure that the POWER switch is in the OFF position and
Assembly
that the ac power cord is removed from J2.
4-14. Removal and Replacement of Monitor Receiver
a. Removal
(1) Tag all wires attached to A4TB1 (4).
a. Removal.
(2)  Loosen, do not remove, six screws securing
the connections to A4TB1 (4).
(1) Make sure the POWER switch is in the OFF
(3) Remove four screws (2) securing the power
position, then remove the ac power cord from J2.
supply assembly (3).
(2) Disconnect the antenna from J1.
b. Replacement
(3) Tag and disconnect all wires at TB1.
b. Replacement.
(1) Replace the power supply assembly by
reversing the procedures in a above.
(1) Replace the monitor receiver by reversing
the procedure in a above.
(2) Perform the maintenance turn on procedure
(2) Perform the procedure of paragraph 2-4.
4-15. Removal and Replacement of Audio Amplifier
PCB
4-8


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