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 TM 55-1905-219-14-11
5-152. LOUDHAILER - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
TESTS (Cont)
(i) The oscilloscope is convenient for spotting unbalance in the push-pull output circuit. If one half of the
output sine wave is flattened or appreciably distorted compared to the loop on the other half, this can mean one of the
output transistors has gone bad. It can also indicate one half of the driver secondary is open, or that one of the collector
to base resistors is defective. Further checks for amplifier transmission troubles ahead to the output stage follow
standard electronic amplifier testing procedures.
5-1515
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