Section 5 Maintenance And Adjustment; Preparation Before Servicing - Icom IC-3200A Service Manual

SECTION
5
MAINTENANCE AND ADJUSTMENT
5
-
1
PREPARATION BEFORE
SERVICING
1
.
Detach
the
power
cord
and
turn
OFF
the
VOLUME/POWER CONTROL
before performing any work on
the transceiver.
2.
Do
not short
circuit
components
while
making
adjustments.
3.
Use an
insulated tuning
tool for
all
adjustments.
4.
Do
not force
any
of the variable
components. Tune them
slowly
and
smoothly.
5.
Follow the
instructions exactly.
If
an
indicated
result
is
not obtained, repeat the
instruction
until
the correct
result
is
obtained.
6.
Check
the condition of
connectors, solder
joints
and
screws
when
adjustments are complete.
Confirm
that
components
do
not
touch each
other.
7.
Confirm defective operation
of
the transceiver
first
when
checking an
out-of-service
unit.
Verify that external
sources
do
not
cause the problem.
8.
Use the correct
tools
and
test
equipment.
9.
Remove
the transceiver
case as
shown
in
SECTION
8-1
.
10.
Attach a 13.8
volt
DC
external
power
source
to
the
power
supply connector.
Be
sure to
check
the
polarity.
1 1
.
For transmission problems,
attach
a
dummy
load to the
antenna connector. For reception problems,
attach
an antenna
or
signal generator to the
antenna connector. Do, not
transmit into
the
signal
generator.
12.
Recheck
for
the
suspected malfunction
with the
VOLUME/POWER CONTROL
ON.
13.
Check
the defective
circuit.
Measure
the
DC
voltages
of
the
collector,
base and
emitter of
each
transistor.
5
—
1