7 - 2 PRELIMINARY
CHECKS
7 - 2 • 1 TRANSMITTER OUTPUT CHECKS
Power
Supply
8.4Vor
Battery (IC-CM3)
1. Connect a 50 ohms RF
wattmeter
to
the ANT connector.
50.Q
Power
M.
2. Setting
the
Set
to
any programmed channel and key
the
transmitter. Observe
the
RF power OUT-
PUT.
3.
Power
output
should be 2.5 -
3.0
watts
at
rated input (power supply) voltage.
7 · 2 · 2 RECEIVER
CHECKS
Make
all
checks
at
8.4V DC
1. Settings
of
controls and switches
Power switch
ON
Squelch Control Fully counterclockwise
Frequency Any programmed
channel
Oscillo-
scope
EXT.
SP.
Audio
V.M.
Power
Supply
S.G.
EXT
SP
o
JACK
,.,..._.i......w......,,,.,....
0
8.4V
2. Connect an AF voltmeter
to
the
EXT
SP
jack and set
the
SOL control fully counterclockwise.
3. Connect
the
RF
output
of
a VHF signal generator
to
the
ANT connector.
4. Adjust the
VOL control and the AF voltmeter range.
Adjust
the
VOL control for a full scale reading
on
the
AF voltmeter. Don't change
the
VOL control
setting after this adjustment.
5. Set the signal generator
to
the
receiving frequency and adjust the
output
level
of
the
signal generator
until
the
AF voltmeter shows a 20dB decrease
in
reading.
6. The signal generator
output
voltage
at
this point
is
the
20dB quieting sensitivity.
7 - 3 PREPARATION AND PROCEDURE BEFORE SERVICING
1.
Confirm defective operation and check
to
make sure setup or external sources are not
the
cause
of
the
problem.
2. Proper tools and measuring instruments are required for repair and adjustment.
Don't
try
to
repair
or modify
without
them.
7-2
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