Table 7-1. Direct Support (Intermediate) Test Equipment
(code ident 24432)
Section III. TROUBLESHOOTlNG
7-5. Troubleshooting Data.
either the first step in troubleshooting, or use after
a. General. In addition to the troubleshooting
repairs are completed and before the equipment is
chart, other troubleshooting data is supplied as
returned to the using organizations.
described in the following paragraphs.
(1) Inspect enclosure for evidence of physical
tains the parts location information for the processor
(2) Inspect terminal strips for cleanliness and
evidence of physical damage.
rear of manual) and 7-1 comprise the schematic
(3) Check all resistors for evidence of discolora-
diagrams for the processor and the receiver respec-
tion due to overheating.
(4) Inspect all wiring and cabling for worn or
frayed insulation, and broken, loose, or disconnected
wires or cables.
7-6. Cable Checks.
(5) Inspect all metal surfaces, intended to be
The procedure outlined in a through d below is
painted, for condition of finish and legibility of panel
given as a convenient method of checking for
continuity or a short in single conductor and
Touchup paint is recommended instead of refinishing
a. Disconnect both ends of the cable to be tested.
b. Check for grounds using a multimeter between
(6) Check the equipment for applicable modifica-
each lead and the conduit or each lead and its
tion work orders (MWO).
respective shield. Continuity should indicate infinity
(7) Inspect overall unit for presence of dirt,
(both ends unterminated).
corrosion, moisture, and bits of wire and solder inside
c. Check for opens by selecting one conductor in
the cable and grounding it at one end to the conduit.
At the other end of the cable check continuity
7-8. Symptom Analysis
between lead and conduit. Infinite indication is an
Chart 7-1 lists the following identifiable symptoms to
assist the repairman in localizing potential faults.
d. Follow the procedure in step c above for the
remaining conductors in the cable.
During performance of the symptom analysis when a pc
board is replaced in either the processor or the receiver,
the SENSITIVITY and GAIN controls must be reset
7-7. Physical Test and Inspection
and the tamper circuit checked according to procedures
General. This procedure is provided for use as