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Technics SA-222 M

Technics SA-222 M
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Step
No.
10
11
12
AM
SIGNAL
GENERATOR
CONNECTION
FREQUENCY
DISPLAY
1___
FREQUENCY
PREPARATIONS
PARTS
ADJUSTED
ADJUSTING
PROCEDURE
AM-RF
ADJUSTMENT
Connect
AM-SG
to
AM
antenna
terminal
through
200pF
capacitor.
Common
to
chassis.
(Weak
input)
610kHz
(30%
Mod.
with
400Hz)
610kHz
Connect
AC
VTVM
terminals
of
the
set.
to
scope
to
‘‘Speaker”’
L201
(ANT
Coil)
.
Adjust
for
maximum
output.
.
Adjust
ferrite
core
of
L201
by
screwdriver.
1500kHz
(30%
Mod.
with
400Hz)
FM
TUNER
ADJUSTMENT
Equipment
used
FM
signal
generator
(FM-SG)
.
Stereo
modulator
.
Distortion
analyser
.
Oscilloscope
.
ACand
DC
electronic
voltmeters
(VTVM).
.
Frequency
counter
(19kHz
and
108MHz
measurable).
FM300Q
dummy
antenna
(Fig.
9)
.
Connect
AC
VTVM
.
Adjust
for
maximum
output.
To
SG
|
(SG
imp.
752)
CT201
(ANT
Trimmer)
1500kHz
.
Repeat
step
(7)
until
the
frequency
correctly
matches
the
dial
display.
to
scope
to
‘‘Speaker”’
terminals
of
the
set.
*
Preparation
of
FM
signal
generator
(FM-SG)
1.
Connect
stereo
modulator
to
FM-SG.
2.
Apply
SG
output
to
antenna
terminal
of
the
set
through
3000
FM
dummy
antenna.
3.
The
standard
input
of
the
set
is
60dB
(1mV),
400Hz
100%
modulation
(Because
of
using
dummy
antenna,
SG
output
must
be
12dB
plus
(IHF).
That
is,
when
input
is
60dB,
SG
output
is
to
be
72dB.
Setting
.
Setband
selector
to
‘‘FM”’
position.
.
Other
setting
are
the
same
as
in
AM
tuner
adjustment.
AM
SIGNAL
GENERATOR
|
CONNECTION
FREQUENCY
|
PARTS
ADJUSTMENT
DISPLAY
FREQUENCY
ADJUSTING
PROCEDURE
PREPARATIONS
FM-IF
ADJUSTMENT
No-Signal
Connect
DC
VTVM
between
[§GEIOA
and
through
choke
Adjust
T101
core
so
that
voltage
measured
in
signal
mode
is
OV
in
300mV
range.
100.
1MHz
T101
(Discri.
IFT)
coil.
(Refer
to
Fig.
10)
FM
RF
ADJUSTMENT
Connect
FM-SG
to
FM
antenna
terminal
through
3000
FM
dummy
antenna.
90.1MHz
(100%
Mod.
with
400Hz)
Weak
input
90.1MHz
Connect
scope
to
“Speaker’’
terminals
of
the
set.
Connect
FM-SG
to
FM
antenna
terminal
through
3000,
FM
dummy
antenna.
(Apply
16dB
to
antenna
terminal)
100.
1MHz
(100%
Mod.
with
400Hz)
ea
L1
(FM
ANT
Coil)
L2
(FM
DET
Coil)
T1
(FM
IFT)
.
Check
step
(2)
and
if
it
is
deflected
readjust
of
L4.
.
Add
weak
input
so
that
noise
is
included
in
the
output
wave
form.
.
Make
the
adjustment
so
that
the
output
wave
form
is
vertically
symmetrical.
(Refer
to
Fig.
11)
.
Check
step
(3)
and
if it is
deflected
readjust
of
CT1.
FM
MUTING
LEVEL
ADJUSTMENT
100.1MHz
Connect
AC
VTVM
or
scope
to
‘’Speaker”’
terminals
of
the
set.
re
VR101(Muting
level)
.
Set
the
FM
muting/FM
mode
switch
to
“‘off/mono”.
.
With
the
FM
muting/FM
mode
switch
set
to
“‘on/auto”
adjust
VR101
so
that
the
output
is
given
with
muting
condition
released.
FM
MPX
PILOT
(VCO)
ADJUSTMENT
Connect
FM-SG
to
FM
antenna
terminal
through
300Q
FM
dummy
antenna.
100.
1MHz
(Non-
modulated)
100.1MHz
Connect
frequency
counter
to
Mggeyeh}
terminal
through
resistor
(100kQ)
STEREO
VR301
(VCO)
.
Set
the
FM
muting/FM
mode
switch
to
‘‘on/auto”.
.
Adjust
VR301
to
19kHz
+
30Hz.
DISTORTION
ADJUSTMENT
Connect
FM-SG
to
FM
antenna
terminal
through
3000
FM
dummy
antenna.
(Pilot
10%
Mod.
stereo
signal)
100.1MHz
(100%
Mod.
with
400Hz)
(L
mode)
100.1MHz
Connect
distortion
analyser
to
‘‘Speaker”’
terminals
of
the
set.
T1
(IFT)
.
Set
the
FM
muting/FM
mode
switch
to
‘‘on/auto”’.
.
Re-adjust
the
already
adjusted
T1
within
+
90°
from
the
preset
core
position
so
that
the
distortion
of
L
ch
is
minimized.
Frequency
meter
|
‘re
OC
VTVM
COIL
(1\OOpH)
(SLOXI0I
-
20)
112.50
|
fe}
1To
Receiver
1600
|
Noise
3002
FM
Dummy
Antenna
AF
output
wave
form
[Fig.
9]
[Fig.
10]
(Fig.
11]
Pointer
(When
1500kHz)
(When
1100kHz)
(When
107.9MHz)
(When
100.1MHz)
[Fig.
12]
[Fig.
13]
ADJUSTING
POINTS
AM
Antenna
AM
OSC
AM
Antenna
coil
trimmer
trimmer
[L201
|
201
AM
OSC
Pull
out
FM
Antenna
coil
AM-IF
(Ist)
FM
Detector
coil
MPX
VCO
adj.
AM-IF
(2nd)
T202
FM
OSC
trimmer
FRONT

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