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FM
ALIGNMENT PROCEDURE
INSTRUMENTS:
*FM
Signal Generator modulated with 100Hz
at
100%.
* AC/DC VTVM and Oscilloscope.
NOTE: *Set Function Seelctor Switch
to
FM.
*Connect
Signal
Source
to
FM
Antenna
Terminals.
SIGNAL
CONNECT
OUTPUT
STEP
FREQUENCY
STRENGTH
DIAL
SETTING
METER
TO
ADJUST
ADJUST FOR
1
2
3
4
5
6
7
8
9
10
STEP
1
2
STEP
1
2
Quiet Point on
Band
Same
as
Above
Near
98MHz
-1
dB
of
Limiter
Tune
for
Zero
Saturation
Volts
DC
at
R226 (47 k ohm)
Repeat Steps 2 and 3
until
no
further
improvement
is
noticed
90MHz
Approx.
1
0µV
90MHz
106MHz
Approx.
10µV
106MHz
Repeat Steps 5 and 6
until
no
further
improvement
is
noticed
90MHz
-3dB
of
Limiter
Tune
for
Zero
Saturation
Volts
DC
at
R226 (47 k
ohm)
106MHz
Same
as
Above
Same
as
Above
Repeat Steps 8 and 9
until
no
further
improvement
is
noticed
POWER AMPLIFIER IDLING ADJUSTMENT
INSTRUMENT: *DC VTVM.
NOTE: *Set Function Selector
Switch
to
AUX.
Oscilloscope
to
T201
Top
and
Maximum
Noise
R226 (47 k
ohm)
Bottom
(on
Front
End)
Same
as
Above
T202
Top
Zero
Volts
DC
Oscilloscope
to
Tape
T202
Bottom
Maximum
Symmetric
Out
Jack
Output
on
Oscilloscope
Oscilloscope
to
L201 (OSC)
Zero Volts DC
R226 (47 k ohm) (on
Front
End)
Same
as
Above
TC201 (OSC)
Zero Volts
DC
(on
Front
End)
VTVM
and
L202
(RF)
Maximum
Output
Oscilloscope
to
T203
(ANT)
Tape
Out
Jack (on
Front
End)
Same
as
Above TC202
(RF)
Maximum
Output
TC203
(ANT)
(on
Front
End)
*Set Volume Control
to
minimum and
set
Tone/Balance
controls
to
mid position.
*Set
Stereo/Mono
Switch
to
Stereo.
*Speaker Switch
to
ON.
*Connect
8
ohm
(50W) resistor across left and right speaker terminals.
DC
VOLTMETER
CONNECTION
ADJUST
ADJUST
FOR
Across R428 Resistor
VR402
10mV±1mV
Across R427 Resistor
VR401
10mV±1mV
TUNING INDICATOR ADJUSTMENT
INSTRUMENT: *FM Signal Generator.
NOTE: *Set
Function
Selector
Switch
to
FM.
*Connect
Signal
Source
to
FM
Antenna
Terminals.
SIGNAL
FREQUENCY
STRENGTH
DIAL
SETTING
98MHz
1mV(60dB)
Tune
for
Zero
Volts
DC
at
R226
(47 k
ohm)
Same
as
Above
Same
as
Above
Same
as
Above
-4-
ADJUST
VR201
VR202
ADJUST
FOR
Maximum
Needle
Deflection
on
Tuning
Meter
To
Indicate 9 on
Tuning
Meter
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