ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
Section I. ORGANIZATIONAL TROUBLESHOOTING
a. This section contains troubleshooting information for locating and correcting most of the operating troubles which
may develop in the laboratory. Each malfunction for an individual component or apparatus is followed by a list of tests or
inspections which will help you to determine the probable causes and corrective actions to take. You should perform the
tests/inspections and corrective actions in the order listed.
b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions. If a
malfunction is not listed or is not corrected by listed corrective actions, notify your supervisor.
4-2. REPAIR PARTS AND EQUIPMENT FOR THE LABORATORY ASSEMBLY .
Repair parts and equipment for the laboratory assembly will be requisitioned by standard nomenclature and stock
number listed in the Department of the Army Supply Catalog.
4-3. GENERAL INSTRUCTIONS FOR USE OF MULTIMETERS.
a. Introduction. In electrical troubleshooting, the Simpson 160, the TS-352B/U, and the AN/URM-105 will do the
same job. Therefore, your shop sets may contain any one of these multimeters (fig. 4-1). Any of these three
multimeters can be used to troubleshoot your equipment's electrical system. This section shows how.
The Simpson 160 is only available in new shop sets as a substitute for TS-352B/U or AN/URM-
b. Using the Ohms Scale. The ohms scale is used to make tests for continuity, shorts and resistance.
(1) " eroing" the Meter (fig. 4-2). The multimeter must be set up and "zeroed" before making these tests. Do
the following steps that match the multimeter you have:
If the needle will not "zero", replace the batteries. If the needle still will not "zero" after replacing
the batteries, turn the meter in for repair.