Amplifier-Modulator AM-3507/PRC-47 (A8A2).

TM 11-5820-509-35

NOTE

(b) Install the card assemblies in their

When replacing the module cover,

respective locations (fig. 3-7 and 3-8) and secure them

observe the notch orientation in the

in place with the 4-40 x 3/16 pan head screws.

bottom edges of the cover; verify

that the cover is fully seated before

and secure them with the 4-40 x 3/16 flat head screws

attempting to install the retaining

(four per side) to the module chassis.

screws and washers.

NOTE

b. Amplifier-Modulator AM-3507/PRC-47 (A8A2).

Be sure to place the proper cover on

(fig. 3-7 3-8, 3-20 and 3-21)

each side of the module so that its

silkscreen agrees with the assembly

(1) Disassembly Procedures.

it covers.

(a) Remove the four 4-40 x 3/16 flat

head screws that secure each side cover to the module

chassis.

c. Signal Data Translator CV-1377A/PRC-47

(A8A3). (fig. 3-9 3-10 3-22 through 3-44)

NOTE

(1) Disassembly Procedures.

If interconnecting wires between

(a) Remove the 4-40 x I/4 screws that

card assemblies or between a card

secure the top and/or bottom covers to the module

and the module connector must be

chassis.

removed to affect repairs tag each

(b) To remove card assemblies E47

wire carefully so that it may be

and E48 remove the four 4-40 x 1/4 flat head screws

reconnected to its proper terminal

from the right side of the module chassis and lift the

location.

card assemblies upward and out of the unit through the

top of the chassis.

(b) To remove card assembly E1

disconnect the two shielded wires (from test point J2

and TB2 remove the two 4-40 x 1/4 flat head screws

and P3-A2) from the terminal adjacent to capacitors C7

from the right side of the chassis and lift the card

and C8 (fig. 3-7). Next remove the four remaining

assembly out through the bottom of the chassis.

wires that interconnect P3 (terminals 1 through 4) with

(d) To remove card assembly E46,

terminals on the card. Remove the five wires that

remove the two 2-56 x 3/16 screws from the divider and

interconnect card assembly E1 with card assembly E2

lift the card assembly out through the bottom of the

(two wires are adjacent to transformer T2). Finally

chassis.

remove the four 4-40 x 3/16 pan head screws that

(e) To remove any switch card

secure the card assembly to the module chassis.

assembly first verify that the frequency range switch

shaft coupling is in the position shown in figure 3-44;

disconnect the seven wires (2 near transformer T2) that

then perform steps (f) through (h).

interconnect this card assembly with the remaining

(f) Remove the C-shaped retaining ring

circuits of the module. Loosen and remove the two 4-40

from the rear of the frequency range switch shaft (fig. 3-

x 3/16 pan head screws that secure the card assembly

43).

to the module chassis.

(g) Withdraw the shaft from the module

(d) Card assemblies E3 E4 and E5 are

through the coupler end of the unit.

accessible from the opposite side of the module chassis.

(h) Slide out the desired switch card(s).

Disassemble and tag the circuit components if they are

removed.

NOTE

(2) Repair Procedures.

Replace any

If the vfo subassembly with switch

defective component or repair the circuit using the

cards S6 and S7 is to be removed

procedures outlined in section IV. Component parts

loosen and remove the two 4-40 x

shown on the module schematic diagram Fig 7-10, are

3/16 screws at the right side of the

located on figures 3-20 and 3 21.

module before lifting the vfo

subassembly out. l he assembly

CAUTION

consisting of switch cards S1 S2 and

When using a soldering iron to

S3 (as well as the vfo subassembly)

remove or to replace a component,

are fastened together and must be

part use only enough heat to cause:

removed as a unit.

Further

the solder to flow. Excess heat can

disassembly may be required d

damage the component and may also

before repair to an individual

damage the printed circuit.

component or card can be affected.

(3) Reassembly Procedures.

interconnecting

wires

(a) Replace and solder any wires

component leads interconnect these

removed from the module connector or between the

individual cards carefully tag each

card assemblies during` disassembly or repair

lead before removing it to assure that

procedures.

it can be reconnected to the

3-99