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Technics SL-P250 - Page 9

Technics SL-P250
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TEMPORARY
SETTING
OF
EACH
VR
Note
:
If
a
disc
skips
or
can
not
be
played
back,
adjust
each
VR
temporarily,
as
shown.
VR106
VR101
VR105
lt
felt
fl
BEST
EYE(PD
BALANCE)
ADJUSTMENT
1.Connect
CH1
of
the
oscilloscope
to
TJ101
(+)
and
GND
(-)
of
the
servo
P.C.B.
Oscilloscope
setting:
VOLT
200mV
SWEEP.....0.5usec.
2.Set
atest
disc
(SZZP1014F
or
SZZP1054C)
and
turn
ON
the
power
switch
of
the
player.
(Refer
to
page
13.)
3.Set
the
player
to
the
play
mode.
4.Adjust
VR101
so
that
the
eye
pattern
of
RF
signal
is
stretched
to
maximum.
5.Turn
OFF
the
power
switch
of
the
player.
FOCUS
GAIN
ADJUSTMENT
1.Connect
the
servo
gain
adjuster.(Refer
to
page
12.)
2.Set
the
selector
switch
of
the
servo
gain
adjuster
to
2
and
ON-OFF
switch
to
ON.
3.Set
the
low
frequency
oscillator
to
a
frequency
of
825Hz
and
an
output
voltage
of
100mVp-p.
Then
connect
the
oscillator
to
OSC
(+)
and
GND
(-)
terminals
of
the
servo
gain
adjuster.
4.Connect
CH1
and
CH2
of
the
oscilloscope
to
TP1
and
TP2
of
the
servo
gain
adjuster.{
TP3
is
the
ground
terminal.)
Oscilloscope
setting:
VOLT
100mV(both
channels)
5.Set
atest
disc
(SZZP1014F
or
SZZP1054C)
and
turn
ON
the
power
switch
of
the
player.
(Refer
to
page
13.)
6.Set
the
player
to
the
play
mode.
7.Set
the
selector
switch
of
the
servo
gain
adjuster
from
von
to
ee
Ye
8.825Hz
signals
will
be
displayed
on
the
oscilloscope.
Adjust
VR104
until
the
waveform
amplitudes
of
both
channels
are
equal.
9.Shift
the
selector
switch
of
the
servo
gain
adjuster
from
”3”
to"2”.
TRACKING
GAIN
ADJUSTMENT
1.Oscilloscope
setting
and
connections
are
the
same
as
above.
2.Set
the
low
frequency
oscillator
to
a
frequency
of
1.0kHz
and
an
output
voltage
of
100mVp-p.
3.Set
the
selector
switch
of
the
servo
gain
adjuster
from
no”
to
wear.
4.1.0kHz
signals
will
be
displayed
on
the
oscilloscope.
Adjust
VR102
unti!
the
waveform
amplitudes
of
both
channels
are
equal.
5.Shiftthe
selector
switch
of
the
servo
gain
adjuster
from
vq"
to
iy
ke
VR104
VR102 VR103
KININ
Gt
CAA
x
AX
AARON
.
OUUSCOCNEES
Kx
3X
Most
stretched
eye
pattern.
a
AIA
A
AIA
A
WW
VINE
VE
iN
hd
RS
a
I
ane
Seay
TA
AA
GALA
A
DA
VAVIVAAVI
a
WO
|
FOCUS
OFFSET
ADJUSTMENT
1.Connect
CH1
of
the
oscilloscope
to
TJ101
(+)
and
GND
(-)
of
the
servo
P.C.B.
Connect
CH2
of
the
oscilloscope
to
FEG
(+)
and
GND
(-)
of
the
servo
P.C.B.
Oscilloscope
setting:
VOLT
200mV(CH1),
500mV(CH2)
SWEEP.....0.5msec.
(Triggering
via
CH1)
2.Set
the
test
disc
(SZZP1057C)
and
turn
ON
the
power
switch
of
the
player.
(Refer
to
page
13.)
3.Set
the
player
to
the
play
mode.
4.Check
the
waveform
of
CH1
and
CH2
on
the
oscilloscope
and
adjust
VR105,
so
that
the
waveform
around
the
triggering
point
becomes
as
shown
in
the
illustration.
TRACKING
OFFSET
ADJUSTMENT
1.Connect
CH1
of
the
oscilloscope
to
TJ101
(+)
and
GND
(-)
of
the
servo
P.C.B.
Connect
CH2
of
the
oscilloscope
to
TEG
(+)
and
GND
(-)
of
the
servo
P.C.B.
Oscilloscope
setting:
VOLT.
200mV(CH1),
500mV(CH2)
SWEEP.....0.5msec.
eh
DC(CH2)
are
senine
via
CH1)
2.Set
the
test
disc
(SZZP1057C)
and
turn
ON
the
power
switch
of
the
player.
(Refer
to
page
13.)
3.Set
the
player
to
the
play
mode.
4.Check
the
waveform
of
CH1
and
CH2
on
the
oscilloscope
and
adjust
VR103,
so
that
the
waveform
around
the
triggering
point
becomes
as
shown
in
the
illustration.
TRACKING
OFFSET
BALANCE
ADJUSTMENT
1.Set
the
low
frequency
oscillator
to
a
frequency
of
1kHz
and
an
output
voltage
of
200mVp-p.
Then
connect
the
oscillator
to
OSC
(+)
and
GND
(-)
terminals
of
the
servo
gain
adjuster.
2.Connect
CH1
of
the
oscilloscope
to
TJ101
(+)
and
GND
{(-)of
the
servo
P.C.B.
Oscilloscope
setting:
VOLT
500mV
SWEEP.....0.5msec.
2.Set
a
test
disc
(SZZP1014F
or
SZZP1054C)
and
turn
ON
the
power
switch
of
the
player.
(Refer
to
page
13.)
4.Set
the
player
to
the
play
mode.
5.Set
the
selector
switch
of
the
servo
gain
adjuster
from
"2”
to
"1".
6.Adjust
VR106,
so
that
the
output
waveform
is
as
shown
(jitter
is
minimized).
7.Shift
the
selector
switch
of
the
servo
gain
adjuster
from
4”
to
DUS
8.Turn
OFF
the
power
switch
of
the
player.
9.Disconnect
the
servo
gain
adjuster.
Smooth
envelope
Minimize
the
amplitude
or
make
A=B
Smooth
envelope
Pearse
Minimize
the
amplitude
or
make
A=B
“Jitter
should
be
minimized.
SL-P250

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