Repair of Amplifier-Mixer 2A7

TM 11-5820-695-35

pair of these assemblies is piece part replacement. Parts

(2) Remove the 11 screws securing the bottom

location and wiring diagrams for plug-in components

cover on amplifier-frequency multiplier 2A10 and remove

1A14A1 through 1A14A6 are shown In figures 4-24

the cover.

through 4-35.

Electrical parts location on electrical

(3) Remove the screw, lockwasher, and locking

equipment chassis 1A14A10 and printed wiring board

lever (fig. 4-4) for diode 2A10CR3, on the bottom side of

1A14A9 is shown in figures 4-22 and 4-23. No special

chassis.

instructions are required for depot level disassembly and

(4) Unscrew diode 2A10CR3; remove and

piece part replacement.

discard it. Retain the spring tension washer.

4-10. Repair of Amplifier-Mixer 2A7

b. Replacement of Varactor Diode 2A10CR3.

Depot repairs to amplifier-mixer 2A7 (fig. 4-41) consists

(1) Screw in the replacement varactor diode

of replacement of defective parts. Special consideration

noting when the spring tension washer comes into contact

must be given to the replacement of matched pair crystal

with surface of inductor 2A101A14. Continue rotation of

diodes 2A7ZICR1 and 2A7Z1CR2 as indicated below.

the diode only one-half turn beyond this point.

CAUTION

(2) Replace the locking lever, lockwashers and

Before handling crystal diodes,

nut removed in step a(3).

ground yourself to equipment case

(3) Replace bottom cover on amplifier-

ground to dissipate any existing static

fr6quency multiplier 2A10 and secure with the 11 screws

charge.

moved in a(2).

a. Removal of Crystal Diode fA7ZICRI or

(4) Replace top cover on 2A10 and secure in

2A7Z1CR2.

place using the 18 screws removed in a(1). Start with

(1) Using a screwdriver, unscrew and remove

screws in center and work outward. Tighten screws to

the diode cover screw covering the defective crystal

torque of 40-50 inch-ounces.

diode.

4-11.1. Converter-Multiplier CV-3633/GRC-144(V), Unit

(2) Using long nose pliers, grasp the diode's base and

extract it from amplifier-mixer 2A7.

Converter-Multiplier CV-3633/GRC-144(V) contains five

(3) Pull diode from diode base.

plug-in assemblies 3A1, 3A2, 3A5, 3A6 and 3A8 that are

b. Replacement of Crystal Diode 2A7Z1CR1 or

replaceable at the organizational level and four

2A7Z1CR2.

assemblies 3A3, 3A4, 3ACR1 and 3A7HY1 that are

(1) Note cathode orientation when replacing

replaceable at the direct support level (para 3-53.3

the crystal diode. Orient the replacement crystal diode in

through 3-53.6). Depot repair of the CV-3633/ GRC-

accordance with the polarity shown in figure 4-41 and

144(V) consists of piece part and component

stamped on the assembly and insert crystal diode into the

replacement. Parts location illustrations of the CV-

diode base, insuring positive seating.

3633/GRC-144(V) are shown in figures 5-108 through 5-

(2) Insert diode (with base) into amplifier mixer

118. There are no special instructions required for depot

2A7.

level disassembly and piece part replacement for the

alarm-monitor 3A1, power supply 3A6, electrical

(3) Replace and firmly secure diode cover

equipment chassis 3A7 and

screw.

4-11. Repair of Amplifier-Frequency Multiplier 2A10

Amplifier-frequency multiplier 2A10 (fig. 6-95) depot

repair is the replacement of defective part. Special

instructions for removal and replacement of varactor

diode 2A10CR3 are provided below.

a. Removal of Varactor Diode 2A10CR3.

(1) Remove the 18 screws securing the top

cover on amplifier-frequency multiplier 2A10 and remove

the cover (fig. 5-95).

Figure 4-4.

Amplifier frequency multiplier 2A10

varactor diode replacement.

Change 6

4-6