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Technics SL-PJ27 - Page 12

Technics SL-PJ27
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SL-PJ27
Measuring
Instruments
and
Special
Tools
*
Servo
gain
adjuster
(SZZP1017F
or
SZZP1094C-1)
*
Test
discs
1.
Playability
test
disc
(SZZP1054C
or
SZZP1014F)
2.
Uneven
test
disc
(SZZP1056C)
3.
Black
band
test
disc
(SZZP1057C)
*
Normal
disc
*
Dual-beam
oscilloscope
with
bandwidth
of
30
MHz
or
*
Allen
wrench
(M2.0)
(SZZP1101C)
*
Allen
wrench
(M1.27)
*
0.9mm
clearance
gauge
(RZZ0297)
*
Filter
Perform
adjustments
depend
on
the
part
to
be
replaced
according
to
followings:
better
(with
EXT
trigger
and
1
:
1
probe).
(1)
Spindle
Motor
...........cccceccceseeeeeeees
Items
(1),
(3)
to
(8)
*
Audio
frequency
(AF)
osillator
(2)
Turntable
2.0.0...
eeeeeceesccesseeseesseeereeaes
items
(1),
(3)
to
(8)
*
Comversion
connector
(SZZP1032F)
(3)
Optical
PickuP.........0.c
cece
cceeeceeeeeee
eens
Items
(2)
to
(8)
Adjusting
Procedure
a
Turntable
If
you
have
replaced
the
optical
pickup,
spindle
motor,
or
turntable,
do
the
following
adjustment:
(1)
TURNTABLE
HEIGHT
ADJUSTMENT
1.
Insert
the
0.9
mm
clearance
gauge
(RZZ0297)
between
the
turntable
and
the
loading
base
(see
the
figure
at
right).
2.
Tighten
the
turntable
retention
screw
with
the
1.27
mm
allen
wrench.
3.
Connect
the
oscilloscope’s
CH.
1
probe
across
VR104‘s
(+)
and
VR106's
(—)
terminals
via
a
filter.
(Note:
A
voltage
of
2.5V
appears
at
the
V.
REF
terminal.
Take
care
not
to
short
the
player’s
chassis
to
the
oscil-
loscope
ground.)
Oscilloscope
setting:
VOLT..........
50
mV
SWEEP.........
1ms.
Input
coupling...
DC
4.
Adjust
oscilloscope’s
DC
zero
balance.
5.
Switch
the
player
power
ON,
and
play
the
test
disc
(SZZP1014F
or
SZ2ZP1054C).
6.
Measure
the
voltage
amplitude
of
the
signal
on
the
oscilloscope.
Note
1.
If
the
measured
amplitude
is
within
a
range
of
+/—
15
mV,
the
turntable
height
is
correct.
If it is
outside
this
range,
adjust
the
turntable
height
by
using
the
clearance
gauge
as
a
pry.
If
the
amplitude
exceeds
+15
mV,
lower
turntable.
If
the
amplitude
is
below
—15
mV,
elevate
the
turntable.
Clearance
gauge
(RZZ0297)
t
Spindle
motor
Note
2.
If
the
measured
amplitude
greatly
surpasses
or
falls
short
of
the
range
above,
set
VR105
at
or
around
the
center,
then
try
to
adjust
the
height
again.
(Then
be
sure
to
adjust
the
focus
offset
as
well.)
Oscilloscope
°Filter
for
turntable
height
adjustment
FA
O
Resistor:
ERDS2TJ103
(10kQ)
o
Capacitor:
ECQV1H104KV
(0.1
uF)
9c
(2)
MECHANICAL
ADJUSTMENT
1.
Connect
the
oscilloscope’s
CH.
1
probe
across
(+)
and
(—)
on
the
Servo
P.C.B.
Oscilloscope
setting:
VOLT..........
100
mV
SWEEP.........
0.5
ys.
Input
coupling...
AC
2.
Switch
the
player
power
ON,
and
play
track
9
on
the
test
disc
(SZZP1056C).
(Playing
any
other
track
may
yield
a
false
adjustment.)
3.
Leave
the
player
in
Play
mode,
and
place
it
as
shown
in
the
figure
on
the
right.
4.
Alternately
adjust
the
two
mechanical
adjusting
screws
with
the
2.0mm
allen
wrench
(SZZP1101C)
until
the
vertical
fluctuation
of
RF
signal
is
minimized
and
the
eye
pattern
is
most
stretched.
5.
After
completing
the
adjustment,
lock
the
mechanical
adjustments
with
lock
paint
(RZZOLO1).
2
—
===
eens
adjustable
with
a
allen
wrench
Optical
pickup
Mechanical
adjustment
screws
é(
ee
PA
AAA,
7s
:
%
Most
stretched
eye
pattern.

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