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securely to the positive (+) terminal of
the battery. The receiver is now ready for
operation from the power supply unit.
NOTE: Since the power line cord supplied
with the receiver is completely
out of the circuit when the vibra-
tor power supply is used, this cord
should be wound up and placed
inside of the receiver case in the
space between the chassis and the
case wall.
7.4 Operation:— The switch on the power cable
must be used for turning the receiver on and off,
the power switch on the receiver being automa-
tically cut out of the circuit when the vibrator
power supply unit is used. To prevent impair-
ment of normal operation, the following pre-
cautionary measures should be observed:
(a) Never remove the rectifier valve while the
power supply unit is in operation. Serious
damage to circuit elements, or even to
the vibrator itself, may result under these
conditions.
(b) Never disconnect any leads on the power
cable unless the power switch is turned off.
Never tighten any terminal screws unless
the power is definitely off. Should it become
necessary to tighten any or all of the screws
on the vibrator power unit terminal board,
always first remove the battery clips from
the battery. THIS is extremely important,
since failure to follow this rule will invari-
ably result in serious damage to the vibrator
power unit itself.
7.5 Maintenance: A schematic diagram of the vi-
brator power supply unit is shown in Figure 5.
The diagram symbol of each part is repeated in
the parts list to facilitate identification by means
of cross reference. Service generally consists of
replacing the vibrator which may have deterio-
rated through prolonged usage. If excessive out-
put hum should occur during operation, the
cause may be a filter-circuit breakdown, such as
leaky or short-circuit filter capacitors. When
servicing the power supply unit, disconnect it
from its source of voltage supply and, using an
ohmmeter, check through for continuity.
Capacitors should be tested by first removing one
side from the adjacent connections so that the
capacitor under test is not connected in the cir-
cuit.
The power supply unit is protected by a 20-
ampere fuse which in the event of failure should
be replaced by one of identical rating.
Figure 5.-1- ibratur Power Supply -- MI-22215 — Schematic Diagram.
[16]
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