Section IV. GENERAL SUPPORT TESTING PROCEDURES

TM 11-5825-271-34

assembly. The control panel assembly is now free to be

4-9. Removal and Replacement of ATU Control

removed.

Panel Assembly

b. Replacement Proceed as follows.

(1) Refer to figure 4-2. Reconnect all tagged

a. Removal Proceed as follows.

wires to the control panel assembly (7).

(1) Refer to figure 4-2.

Using a slot

(2) Reconnect wire removed and tagged in 4-

screwdriver, unlock the ATU front cover (1).

9a(6), above, to terminal 5 of TB1 (4).

(2) Raise the ATU front cover (1) and insert

(3) Secure cable clamp along with cableform

the door support rod (10) into the doorstop bracket (9)

to the control panel assembly (7), using one nut and one

Insert the hitch pin clip through the hole at the end of the

flat washer .

door support rod.

4) Swing the control panel assembly (7) up

(3) Remove two screws (5) and flat washers

onto the two large standoffs and aline the two mounting

(6) securing the control panel assembly (7) to the two

holes.

large standoffs Retain the attaching hardware for

reassembly

CAUTION

(4) Allow control panel assembly (7) to swing

down, so as to expose the connections at the rear of the

Before securing control panel assembly,

assembly.

ensure that there are not wires which

(5) Remove one nut and flat washer securing

could possibly be pinched between the

the cable clamp to the control panel assembly (7).

standoff and the control panel assembly.

Retain cable clamp and attaching hardware for

reassembly.

(5) Install two screws (5) and flat washer (6)

(6) On the electronic assembly (8), tag and

to secure the control panel assembly (7) to the two

remove one wire from the control panel assembly (7) at

standoffs.

terminal 5 of TB1 (4).

(6) Remove the hitch pin clip from the door

support rod (10) and disengage the door support rod

NOTE

from the doorstop bracket (9). Insert the door support

rod in the retainer and lower the ATU front cover (1).

There are two wires connected to

(7) Using a slot screwdriver, lock the ATU

terminal 5 of TB 1 Remove only the wire

front cover (1).

which connects to the control panel

assembly.

(7) Tag and disconnect all wires connected to

the control panel assembly (7) from sources outside the

Section IV. GENERAL SUPPORT TESTING PROCEDURES

There are no special general support testing procedures

repair, general support maintenance personnel must test

for the NDB transmitter, ATU or the change over unit.

the entire unit in accordance with the testing procedures

However,

upon

completion

the

required

in TM 11-5825-271-12.

4-10