Mechanical Alignment of CV-1377A/PRC-47 STUB Rack Coupler

TM 11-5820-509-35

Figure 3-105. Radio Receiver-Transmitter RT-671/PRC-47 ((A8) ),Bottom View, Location of Test Points and

Adjustments.

3-21. Mechanical Alignment of CV-1377A/PRC-47

(4) Set the front panel controls of TR-

STUB Rack Coupler

671/PRC-47 as follows:

NOTE

(a) POWER-LIGHTS switch to POWER

Perform this check only when one or

ON.

more of the following conditions

(b} KILOCYCLES indicator to 2000.

exist:

The

RT-6171

/PRC-47

FSK/VOICE switch to VOICE. (d) OPR-TUNE switch to

frequency selection mechanism has

OPR.

been disassembled for repair; when

(5) Loosen the setscrew that clamps the shaft

the CV-1377A/PRC-47 plug-in module

collar to the slug rack coupling half and slide the

has been replaced.

coupling half along the axis of the drive shaft until

a. Test Procedures.

Measure the clearance

specification clearance is obtained.

between halfs of the slug rack coupler (fig. 3-96) with a

NOTE

feeler gage. Clearance must be 0.002- to 0.020-inches.

Recheck the voltmeter readings during

If not, adjust in accordance with step b.

steps (5) and /6) to assure that the slugrack shaft is

b. Adjustment Procedures.

not rotated during this adjustment.

(1) Remove the RT-671/PRC-47 from its

(6) Retighten the shaft collar setscrew tightly.

case using the procedures detailed in paragraph 3-11.

(7) Place

POWER-LIGHTS

switch

(2) Connect the primary power source to the

POWER OFF and disconnect the multimeter.

POWER connector on the front panel of RT-671 //PRC-

(8) Return the RT 671/PRC-47 to its case

47.

using the procedures of paragraph 3-11 if no further

(3) Connect the dc test probe of Multimeter

adjustments are required.

ME-26A/U alternately to test jacks A7J5 and A7J6 of

Oscillator Control C-311/PRC 47 (fig. 3-100).

3-124