FM FRONT END
ALIGNMENT
PROCEDURE
INSTRUMENT: FM Signal Generator, AC
VTVM
& Oscilloscope
NOTE: Set Function Switch
to
"FM"
Set Mode Switch
to
"MONO"
Set Volume Control
to
"MINIMUM"
Input
Signal must
be
kept
as
low
as
possible
to
avoid
limiting
point
VIVM&
Steps
Generator Generator Tuning Dial
Oscilloscope
Connection Frequency Setting
Connection
87MHz
Frequency
1
(400Hz, 75KHz
Minimum
DEVIATION)
109MHz
Frequency
2 (400Hz, 75KHz
DEVIATION)
Maximum
*3
Connect
L, or R
FM Signal
Channel
Generator
Tape
Out
to
FM
Ant
90MHz
90MHz
.
4 Terminal
(400Hz, 75KHz
Terminal
Deviation)
i06MHz
106MHz
5 (400Hz, 75KHz
Deviation)
Adjustment
& Function
L4
(FM
OSC
Coil)
TC4 (FM
OSC
TRIMMER)
L 1 (FM
Ant
Coil)
L2 (FM
RFl
Coil)
L3
(FM RF2
Coil)
TCl
(FM Ant
Trimmer)
TC2 (FM
RFl
Trimmer)
TC3 (FM RF2
Trimmer)
6
Repeat
steps
4
and
5
until
no further improvement
is
noticed
*3
Repeat
steps
1
and
2
until
no further improvement
is
noticed
FM
IF
AMPLIFIER
ALIGNMENT
PROCEDURE
Adjust
for
Maximum
Amplitude
&
Undistortion
Sine
Wave
on Scope
INSTRUMENT: FM Signal Generator,
FM
Stereo Generator, AC
VTVM,
DC
VTVM,
Oscilloscope & Distortion Meter
NOTE: Set Function Switch
to
"FM"
Set Mode Switch
to
"MONO"
Set Volume Control
to
"MINIMUM"
The
Front
End Alignment must
be
completed.
GENERATOR CONNECTION: Connect
FM
Signal Generator
to
FM
Ant
Terminal
GENERATOR FREQUENCY: 98MHz (400Hz, 75KHz Deviation)
TUNING
DIAL:
98MHz
AC
VTVM,
OSCILLOSCOPE & DISTORTION METER CONNECTION: L, or R Channel Tape
Out
Terminal
NOTE:
All
Readings indicated
are
at Generator
-3-
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