Section V. MAINTENANCE OF MONITOR RECEIVER

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

of table 4-2.

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

4-25.

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

(fig. 4-2)

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

4-24.

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.

(fig. 4-2)

4-14. Removal and Replacement of Monitor Receiver

a. Removal

(fig. 2-1)

(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

of table 4-2.

(2) Perform the procedure of paragraph 2-4.

4-15. Removal and Replacement of Audio Amplifier

PCB

(fig. 4-2)

4-8