Section III ALINEMENT AND ADJUSTMENT PROCEDURES

TM 11-5820-401-34-3/0967-LP-432-3060

Section III ALINEMENT AND ADJUSTMENT PROCEDURES

Subject

Para

Page

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-14

3-90

Crystal Reference System (CRS) Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-15

3-91

Local Oscillator A1500 Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-16

3-94

Local Oscillator A1500 Alternate Alinement Procedure....................................................

3-17

3-97

Tuner A100 Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-18

3-98

lF Discriminator A4200 Alinement.......................................................................

3-19

3-102

Silicon Version IF Discriminator A4200A Alinement..........................................

3-20

3-104

Audio and Squelch Preamplifier A4300 Alinement......................................

3-21

3-107

Silicon Version Audio and Squelch Preamplifier A4300A Alinement . . . . . . . . . . . . .

3-22

3-109

A5300 Squelch Filter Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-23

3-112

Silicon Version A5300A Squelch Filter Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-24

3-115

A5200 Squelch Amplifier Alinement, NEW SQUELCH Level . . . . . . . . . . . . . . . . . . . .

3-25

3-118

Silicon Version A5200A Squelch Amplifier Alinement, NEW SQUELCH

Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-120

3-26

A5200 Squelch Amplifier Alinement, OLD SQUELCH Level . . . . . . . . . . . . . . . . . . . . .

3-123

3-27

Silicon Version A5200A Squelch Amplifier Alinement, OLD SQUELCH

Level

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3-28

3-126

3-14. GENERAL.

This section contains alinement instructions for use with Maintenance Kit MK-1976/VRC and TMDE

(discrete test equipment).The instructions are presented in individual procedures which apply to a

specific stage of the receiver.

Except for the local oscillator alinements, each procedure is self-contained; that is, all necessary

instructions are provided without reference to any previously performed alinement. Therefore, it is

possible to use the procedures in this section to aline an individual module without doing any work on

other stages in the radio.

Howeve, this maintenance approach is not recommended. It is best to perform a complete

realinement of all modules after replacing an individual module. This should be done even if the radio

has undergone its annual realinement less than one year prior to the repair.

Careful performance of all the instructions contained in the alinement procedures ensures that the

radio will meet all performance standards outlined infection I of this chapter. Although the radio may

seem to work satisfactorily if other quick-fix methods are used, there is no guarantee that such

methods will result in proper performance when the radio is used along with secure equipment, or for

other than voice communication.

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