Section III. OA-3633(*)GRC, PARTS REMOVAL AND REPLACEMENT PROCEDURES

TM 11-5820-498-35

Section lll. OA-3633(*)GRC, PARTS REMOVAL AND

REPLACEMENT PROCEDURES

the plug-in assembly. Tag each wire with the

3-12. General

a. Most of the parts of the AM-2060(*)/GRC

identification of the terminal from which it was

may

easily

reached,

and

replaced

removed.

(c) Remove the screws, nuts, and spacers

within the equipment without special procedures.

that secure the printed circuit board to the plug-

Paragraphs 3-13 through 3-15 contain removal

and replacement procedure for those parts of

in assembly.

(2) Replacement (fig. 3-15).

the AM-2060(*)/GRC which are not obvious or

(a) Insert a screw and washer through

which require precautionary procedures.

b. No special tools are required, except that in

each of the four mounting holes of the printed

removing transistors and diodes, use a pencil-type

circuit board.

soldering iron with a 25-watt maximum capacity.

(b) Place a spacer over each of the four

With a pair of long-nose pliers, grasp the lead be-

screws.

tween the transistor or diode and the solder con-

(c) Align the mounting holes of the plug-

nection to dissipate the soldering iron heat.

in assembly with the screws in the printed circuit

board and insert the screws through the mount-

3-13. AM-2060(*)/GRC, Plug-In Assembly,

ing holes.

Removal and Replacement

(d) Place a washer and nut on each of the

The plug-in assembly (fig. 3-11) is removed for

four screws and tighten the nut securely.

performing repairs on it (fig. 3-13 and 3-14),

(e) Solder the wires to test points E1

and to gain access to parts under it (fig. 3-12).

through E17 (fig. 3-9). Check each wire tag to

Before proceeding, remove all cable connections

insure the correct replacement.

to the AM2060(*)/GRC and remove the access

(f) Replace the plug-in assembly in the

plate from the top of the equipment (fig.3-10).

AM2060(*)/GRC (a(2) above).

a. Plug-In Assembly Removal and Replace-

ment.

3-14. AM-2060(*)/GRC, Loudspeaker LS1

Removal and Replacement

(1) Removal.

(a) Remove the four captive screws that

The loudspeaker is removed from the front panel

hold the plug-in assembly to the chassis (fig.

for testing and replacement, or to gain acc'ess to

3-11).

the area behind it. Before proceeding, remove all

(b) Grasp the plug-in assembly and pull

cable connections.

the assembly straight up and out of the equip-

a. Removal.

ment.

(1) Remove the four mounting screws that

(2) Replacement.

attach the loudspeaker cover with the loud-

(a) Insert the plug-in assembly so that

the

speaker

attached to the front

the plug on the bottom of the assembly mates

AM2060(*)/GRC. Place the nylon strap at-

with the receptacle J1 on the bottom of the

tached to the SET POWER connector dust cap

AM-2060-(*)/GRC (fig. 3-12).

clear of the loudspeaker area.

(b) Tighten the four captive screws on

(2) Grasp the front of the loudspeaker

the plug-in assembly (fig. 3-11). Make sure that

cover and pull the loudspeaker cover from the

the plug-in assembly is not loose.

loudspeaker by holding LS1 firmly and snapping

(c) Replace the access plate on top of the

the cover off.

AM-2060(*)/GRC.

WARNING

b. Plug-In Assembly Printed Circuit Board,

When soldering and unsoldering the voice

Removal and Replacement. Use the following

coil leads, be careful to prevent the glass por-

tion of the terminals from cracking due to

procedures to remove and replace the printed cir-

excessive heat. Grasp the terminal lead with

cuit board of the plug-in assembly.

a pair of pliers, between the glass bead and

(1) Removal.

the eye of the terminals, before applying

(a) Remove the plug-in assembly (a(1)

heat.

above).

(3) Unsolder the leads that connect the voice

(b) Unsolder the wires attached to test

coil of LS1 to the feedthrough terminals at the

points E1 through E17 (fig. 3-9) on the top of

3-13