This manual contains maintenance instructions for the
FM/AM-500 and the FM/AM-500A Communications Service Monitor.
The information in this manual will enable the technician to:
1. Service, test, repair or replace any major assembly or
module within the test set.
2. Maintain the operating condition of the set to expected
3. Understand the principles of operation as they relate to
the overall operation of the set, as we 11 as to individual
The designation "FM/AM-500A" is used throughout this manual
when the discussion applies to both, the FM/AM-500 and the
However, when information is applicable to only one model,
it is identified as "FM/AM-500 only" or "FM/AM-500A only".
The contents of this manual are divided into eleven major
sections: SECTION 1 - INTRODUCTION
Provides a brief description of the electrical and
mechanical configuration of the FM/AM-500A, intended to
familiarize the technician with the overall structure of the
SECTION 2 - THEORY OF OPERATION
Describes the FM/AM-500A circuit theory on a simplified
level, based on accompanying block diagrams.
SECTION 3 - PERFORMANCE EVALUATION
Contains "covers on" functional checkout procedures for
evaluating the performance of the FM/AM-500A in generate and
SECTION 4 - CALIBRATION
Contains step-by-step calibration procedures for use during
normal calibration intervals or when replacement parts are
installed in the FM/AM-500A.
SECTION 5 - TROUBLESHOOTING
Contains step-by-step troubleshooting recommendations, in
the form of logical tabular procedures, for use in isolating
fault conditions within the major electrical circuits.
SECTION 6 - DISASSEMBLY/REASSEMBLY PROCEDURES
Provides detailed instructions for removing and/or
disassembling the various modules within the FM/AM-500A, for
purposes of repair or replacement. Contains mechanical
assembly drawings of all modules within the FM/AM-500A.
SECTION 7 - MODULE TESTING
Contains detailed theory of operation, troubleshooting and
testing recommendations for all modules within the
FM/AM-500A deemed to be field repairable. |
SECTION 8 - PREVENTIVF MAINTENANCE
Contains routine instructions for cleaning and inspection of
SECTION 9 - PC BOARD ASSEMBLIES
Contains component layout drawings for all PC Board
assemblies within the FM/AM-500A.
SECTION 10 - CIRCUIT SCHEMATICS
Contains FM/AM-500A circuit schematics for all modules.
Contain useful supplementary maintenance and operational data.