SECTION VI
MAINTENANCE
PART I. GENERAL MAINTENANCE INFORMATION
6-1. PURPOSE.
The information contained in this part of the manual is designed to aid the repairman in detecting abnormal
operation, locating and correcting equipment trouble causing abnormal operation, and checking the service-ability of
repaired equipment.
6-1.1.
GENERAL TROUBLESHOOTING TECHNIQUES.
a. Organization. The first step in servicing Test Set, Gyro Magnetic Compass AN/ASM-61 is to sectionalize the
fault. Sectionalization means tracing the fault to a major component. The second step is to localize the fault.
Localization means tracing the fault to a defective part responsible for the abnormal condition. Some faults, such as
burned-out resistors, can often be located by sight, smell, and hearing. The majority of faults, however, must be isolated
by checking voltages and resistances.
b. Sectionalization. The troubleshooting procedures in table II provide sectionalization of a fault to a component.
Listed below is a group of tests arranged to reduce unnecessary work and to aid in tracing trouble in Test Set, Gyro
Magnetic Compass AN/ASM-61. The first step is to locate the component or components at fault by the following
methods:
(1) Visual inspection. The purpose of visual inspection is to locate faults without testing or measuring circuits.
All meter readings or other visual signs should be observed and an attempt made to sectionalize the fault to a particular
component.
(2) Operational tests. Operational tests frequently indicate the general location of trouble. In many instances,
the tests will help in determining the exact nature of the fault.
c. Localization. After the fault has been sectionalized to a major component or components, perform the
maintenance procedures in the paragraph covering the defective component.
d. Isolation. After the trouble has been localized (c above), the methods listed below will aid in isolating the trouble
to a defective circuit element.
(1) Resistance measurements. Use the appropriate ohmmeter range to obtain accurate readings or indication.
(2) Parts location. After a fault has been isolated to a circuit element, the repair parts and special tools list and
illustrations are used for replacement part numbers and for location of the circuit element.
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