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TM 11-5820-401-34-3/0967-LP-432-3060
Section III ALINEMENT AND ADJUSTMENT PROCEDURES
Subject
Para
Page
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Crystal Reference System (CRS) Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Oscillator A1500 Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Local Oscillator A1500 Alternate Alinement Procedure....................................................
Tuner A100 Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
lF Discriminator A4200 Alinement.......................................................................
Silicon Version IF Discriminator A4200A Alinement..........................................
Audio and Squelch Preamplifier A4300 Alinement......................................
Silicon Version Audio and Squelch Preamplifier A4300A Alinement . . . . . . . . . . . . .
A5300 Squelch Filter Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Silicon Version A5300A Squelch Filter Alinement . . . . . . . . . . . . . . . . . . . . . . . . . . .
A5200 Squelch Amplifier Alinement, NEW SQUELCH Level . . . . . . . . . . . . . . . . . . . .
Silicon Version A5200A Squelch Amplifier Alinement, NEW SQUELCH
Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A5200 Squelch Amplifier Alinement, OLD SQUELCH Level . . . . . . . . . . . . . . . . . . . . .
Silicon Version A5200A Squelch Amplifier Alinement, OLD SQUELCH
Level
...............................................................................................................................
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.
3-90


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