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Technics ST-G470 Service Manual

Technics ST-G470
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eReplacement
of
the
Foot.
ie
os
Removal
of
the
FL
Drive
P.C.B.
ia
Removal
of
the
power
supply
P.C.B.
1.
Remove
the
4
heat
melted
posts
on
the
chassis
with
a
pair
of
Heat
Melted
Posts
Procedure
nippers
or
similar
tool.
157
2.
To
replace
the
foot
(RKA0009-1)
on
the
chassis,
melt
the
4
posts
with
Idering
iron.
a
soldering
iro’
Foot
Soldering
Iron
Chassis
ee
.
~———_
Foot
(RKA0009-1)
@
MEASUREMENTS
AND
ADJUSTMENTS
mw
FM
Control
positions
and
equipment
used
@
FM
signal
generator
(FM-SG)
@
Stereo
modulator
@
Choke
coil
(100yH)
@
Resistor(100kQ)
@
Frequency
counter
@
AC
and
OC
electronic
voltmeter(EVM)
Power
Supply
PC.B:
@
Distortion
analyser
Remove
the
2
claws.
1.
Remove
the
4
screws
(@~@).
2.
Remove
the
2
connectors
(CN106,
CN107).
3.
Remove
the
FL
drive
P.C.B.
in
the
direction
of
the
arrow.
Procedure
1-8
.
Remove
the
7
screws
(@~@).
.
Remove
the
2
connectors
(CN106, CN107).
.
Remove
the
power
supply
P.C.B.
in
the
direction
of
the
arrow.
@When
checking
the
soldered
surfaces
of
main
P.C.B.
and
replacing
the
parts,
do
as
show.
1.
Remove
the
11
screws
(@~@).
2.
Pull
out
the
front
panel
in
the
direction
of
the
arrow
@).
3.
Remove
the
bottom
chassis
in
the
direction
of
the
arrow
©).
4.
Reinstall
the
front
panel
to
the
FL
drive
P.C.B.
@
Oscilloscope
Note:
For
Z201,
Z202,
L301,
L303
and
L304,
they
are
supplied
as
adjusted
parts.
So,
do
not
turn
the
cores
of
the
parts.
It
is
not
necessary
to
adjust
AM
circuit.
FM
MONO
DISTORTION
ADJUSTMENT
1.Test
equipment
connection
is
shown
in
figure.
2.Set
the
unit
to
“FM”
mode.
3.Set
the
radio
frequency
display
and
signal
generator
to
100.10MHz.
4.Adjust
the
core
of
T101
so
that
the
voltage
measured
in
signal
mode
is
OmV
(0+20
mV)
in
300
mV
range.
§.Adjust
T102
so
that
the
distortion
factor
of
L-CH
is
FM
SIGNAL
GENERATOR
CONDITION
Modulation
Modulation
frequency
Output
level
minimized.
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
in
9
resin.
Power
Supply
PC.B.
MPX
VCO
ADJUSTMENT
1.Test
equipment
connection
is
shown
in
figure.
2.Set
the
unit
to
“auto”
position.
FM
SIGNAL
GENERATOR
CONDITION
Modulation
Modulation
frequency
Output
level
3.
Set
the
radio
frequency
display
and
signal
genarator
to
100.10
MHz.
4.Adjust
VR302
for
19kHz+30Hz
on
frequency
counter
reading.
*USING
ALTERNATE
SYSTEM
1.Apply
stereo
signal
from
generator
or
receive
the
stereo
broadcast.
2.Adjust
VR302
until
stereo
indicator
lights
up. Fix
the
arm
of
VR302
as
shown
in
figure.
“Stereo”
OFF
position
“Stereo”
ON
position
(indicator
lighting)
Adjust
point
of
pilot
circult

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Technics ST-G470 Specifications

General IconGeneral
BrandTechnics
ModelST-G470
CategoryTuner
LanguageEnglish

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