Technics ST-X302L Service Manual

ST-X302L
m@ MEASUREMENTS AND ADJUSTMENTS
FM ADJUSTMENT
Control positions and equipment used
®FM signal generator (FM-SG) Frequency cour ter
® Distortion analyser Choke coil (100 LH)
DC electronic voitmeter (EVM) Resistor (100 kQ)
Note: For Z251 (AM-ANT/OSC) and Z202 (AM-IFT), they are supplied as adjusted parts. So, do not turn the cores of the parts.
It is not necessary to adjust the AM circuit.
FM MONO DISTORTION ADJUSTMENT
FM SIGNAL GENERATOR CONDITION
1. Test equipment connection is shown in figure. Modulation..............660. 100%
2. Set the unit to “FM” mode. Modulation frequency ........ 1 kHz
3. Set the radio frequency display and signal generator to * Outputlevel ..........00. 66 dB
100.10 MHz. ere
4. Adjust the core of T201 so that the voltage measured in signal
mode is 0 mV (0+20 mV) in 300 mV range.
5. Adjust T202 so that the distortion factor of L-CH and R-CHis
minimized.
6. Repeat steps 4 and 5.
Note: The adjusting screwdriver used should be made of resin.
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See
MPX VCO ADJUSTMENT
1,
Test
equipment
connection
is
shown
in
figure.
EM-SG
prequency
BoUNeE
2.
Set
the
unit
to
‘‘on/auto”
position.
3.
Set
the
radio
frequency
display
and
signal
generator
to
Bird O
TP301
190
kas
100.10
MHz.
oe
Out
FM
ANT
(750
et
.
(75Q)
| Chassis
4. Adjust
VR301
for
19
KHz+30
Hz
on
frequency counter
reading.
USING
ALTERNATE
SYSTEM
Ss)
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
“Stereo”
“Stereo”
Modulation.............0.00.
100%
OFF
OFF
Modulation
frequency
........
0
kHz
Outputlevel
.............05.
66 dB
VR301
@®-®,
O-®......
“Stereo” OFF
position
BHO)
s.
wean
ested
“Stereo” ON
position
(indicator
lighting)
Oibibesadebiancins
Adjust
point of pilot
circuit
PLL
CLOCK
FREQUENCY
ADJUSTMENT
Use
a
high
impedance
probe.
1.
Test
equipment connection
is
shown
in
figure.
FrOguienicy
countes
2. Set the
Power
Switch
to
“OFF”.
(The
indication “E”
in
the
display
Co)
will blink.)
3. Adjust CT101 for 2,097,152 Hz+10 Hz on frequency counter
reading.
4
7
TP102 (GND)

Technics ST-X302L Specifications

General

Brand	Technics
Model	ST-X302L
Category	Tuner
Language	English