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  in figures
and
The voltage
direct to the referenced item. If no operation-
measurements are shown in the overall sche-
al symptoms are known, refer to TM 11-6625-
matic diagram (fig. 7-3). One or more of the
617-12.
localizing procedures will be necessary, de-
c. Condition to Tests. All checks outlined
pending on the nature of the operational symp-
in the chart are to be conducted with the pow-
toms.
Use voltage measurements to isolate
er supply connected to an ac power source as
the trouble to a particular part when trouble
described in paragraph 2-4.
has been localized to a particular stage.
b.
The troubleshooting
Use of Chart.
d. Troubleshooting Chart.
chart is designed to supplement the operational
check detailed in TM 11-6625-517-12. If pre-
vious operational checks have resulted in ref-
erence to a particular item in this chart, go
-
c. The transistor terminal voltage readings
below were made on an average unit. A meas-
a. When trouble has been localized to a
urement that differs widely from those in the
stage, either through operational checks or
table can, when used with the schematic dia-
some other means, isolate the defective part by
gram, often isolate the trouble to a specific
voltage measurements at the transistor termi-
part.
nals (c below) and other points related to the
stage in question (fig. 7-3).
Caution: Do not make any resistance meas-
urements on the power supply. The multime-
ter battery can destroy the transistors by caus-
ing excessive current flow through them. In
some instances 0.1 volt applied between the
base and emitter in the reverse direction can
destroy a surface barrier transistor.
trace circuits and isolate the faulty component.
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