Technics ST-600

m@ MEASUREMENTS AND ADJUSTMENTS
FM ADJUSTMENT
Control positions and equipment used
@ FM signal generator(FM-SG) e@ Frequency counter
@ Stereo modulator @ Choke coil(100yH)
@ Distortion analyser @ Resistor(100kQ)
@ DC electronic voltmeter(EVM)
Note:
For
Z202(AM-IFT),
Z201(AM
ANT
and
OSC
coil),
2321(FM
ANT
coil),
L321
(L.P.F),
L322(L.P.F)
and
L324(L.P.F),
they
are
supplied
as
adjusted
parts.
So,
do
not
turn
the
cores
of
the
parts.
FM MONO DISTORTION ADJUSTMENT
FM SIGNAL GENERATOR CONDITION
1.Test
equipment
connection
is
shown
in
figure.
Modulation
2.Set
the
unit
to
“FM”
mode.
Modulation
frequency
3.Set
the
radio
frequency
display
and
signal
generator
to
Output
level
100.10MHz.
4.Adjust
the
core
of
T201
so that
the
voltage
measured
in
signal
mode
is
OmV(0+20mV)
in
300mV
range.
5.Adjust
T202
so
that
the
distortion
factor
of
L-CH
is
mini-
mized.
6.Repeat
steps
4
and
5.
7.Make
sure
that
the
distortion
factors
of
L-CH
and
R-CH
are
nearly
the
same
and
minimum.
Note:
The adjusting
screwdriver
used
should
be
made
of
resin.
TPA=TP201 , TPB = TP202
MPX VCO ADJUSTMENT
1.Test equipment connection is shown in figure.
2.Set the unit to “on/auto” position.
3.Set the radio dial and signal genarator to 100.10MHz.
Frequency counter
4.Adjust VR301 for 19kHz+30Hz on frequency counter
reading.
USING ALTERNATE SYSTEM
1.Receive the stereo broadcast.
2.Adjust VR301 until stereo indicator lights up. Fix the arm
of VR301 as shown in figure.
FM SIGNAL GENERATOR CONDITION
Modulation
Modulation frequency ..
Output level
“Stereo” OFF position
“Stereo” ON position
(Indicator lighting)
Adjust point of pilot
circuit
TPA =VR301