TM 11-6660-266-13
CHAPTER 4
DIRECT SUPPORT MAINTENANCE
Section I - TROUBLESHOOTING PROCEDURES
Page
SECTION CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
TROUBLESHOOTlNG PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
THIS EQUIPMENT CONTAINS PARTS AND ASSEMBLIES SUBJECT
TO DAMAGE BY ELECTROSTATIC DISCHARGE (ESD). USE ESD
CONTROL PROCEDURES FOR PROTECTION OF ELECTRICAL AND
ELECTRONIC PARTS, ASSEMBLIES, AND EQUIPMENT IN
ACCORDANCE WITH DOD-STD-1686 CLASS 1 AND DOD-HDBK-263.
4-1. GENERAL.
This section contains instructions to help Direct Support maintenance personnel recognize, find the cause, and
correct equipment malfunctions. This information is presented in two forms: troubleshooting tables and
schematic diagrans. The troubteshooting tables list the common symptoms that may be observed during the
operation and/or maintenance of the Power Supply Unit and 24 VDC Power Supply. The symptoms are cross-
referenced to the most probable cause(s) of the observed malfunction. Table 4-1 lists the common symptoms for
the Power Supply Unit and Table 4-2 lists the symptoms for the 24 VDC Power Supply.
The Power Supply Unit schematic, Figure 4-1 (FO1), and the 24 VDC Power Supply schematic, Figure 4-2, show
the electrical connections and functions of specific circuit arrangements. The schematic diagrams facilitate
tracing the circuits to aid in fault isolation of components and wiring faults or shorts.
NOTES
Troubleshooting information for the MARWIN Processor is contained
in TM 11-6660-280-24.
Troubleshooting information for the RDF Unit is contained in
TM 11-6660-281-34.
4-2. TROUBLESHOOTlNG PROCEDURES.
The first step in troubleshooting the power supplies is to perform a thorough visual inspection of the units.
Particular attention should be paid to the possibility of broken wires, shorted terminals, and discolored wires or
components. Any discrepancies found at this time should be corrected and the unit should be retested to see if
the reported fault has been eliminated.
4-1
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