TM 11-6625-524-14-2
GENERAL
SUPPORT
MAINTENANCE
INSTRUCTIONS
Section I. TROUBLESHOOTING
(b) Check all switches and controls for
ease of operation.
a. General. The first procedure in servicing a
(c) Inspect for loose or missing screws,
defective voltmeter is to sectionalize the fault.
(2) Operational tests. Operational tests
Sectionalization consists of tracing the fault to a
frequency indicate the general location of trouble.
printed circuit b o a r d or chassis. Once the
In many instances, the test will determine the
d e f e c t i v e board is located, isolation to the
exact n a t u r e o f t h e f a u l t . The operating
defective part is accomplished. Troubleshooting
procedures (para 3-4), preventive maintenance
ia performed by the general support repairman.
checks (para 4-4 to 4-6), and the alignment
b. Sectionalization. Listed in (1) through (4)
procedure (para 6-6) provide a good operational
below is a group of tests arranged to help locate
test.
the defect.
(3) Voltage and resistance measurements.
(1) Visual inspection. When the voltmeter is
Voltage and resistance measurement are
brought in for repair, remove the top cover and
shown in figure 6-1. Several waveforms at critical
inspect as follows:
points are shown in figure 5-10. Use these to
(a) Check to see that all confections and pc
localize trouble to a component.
boards are properly seated. Repair or replace any
connections or leads that are broken or otherwise
defective.
