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Technics SL-J2 - Page 17

Technics SL-J2
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Turntable
does
not
rotate
©,
8,
©
of
transistor
are
as
follows:
Collector
Cr:
:
Base
Emitter
*1
FP
may
Check
pointsint
——_—_
fare
common
to
all
symptoms.
Push
start
switch
(S302).
==
Power
source
circuit
1.
AC
18V
between
FC1
terminals
@
and@.
2.
DC
voltage
of
regulator
IC
(1C1)
@19.8V,
@ov,
@
11.9V
3.
DC
voltage
of
regulator
transistor
(Q1)
©95V
@57V
©5v
ves}
1.36
~+—+»|
msec.
agi
Clock
frequency
1.
Connect
between
terminals
@
and
(1)
of
1307.
Waveform
of
terminal
of
1C301.
yes}
0.6ms~0.8ms
Key
scan
signal
|
|“
4.
ay
1.
Waveform
of
terminals
®
ad
:
a4)
~
42
of
1C301.
.
ves
|
Power
supply
input
terminal
1.
DC
voltage
at
terminal
@>
of
1C101.
(11.9V)
2.
DC
voltage
at
terminal
(8)
of
1C201.
(8.5V)
+
——
ee
YES
Start/stop
and
brake
circuit
°
C[@]®o
Voltage
|0.
re
11.7V,
4.
ov
|
4.9V
F
7V
|
2;
a
between
terminal.
@
and
©
(@
and
7
is
of
1C101.
33rpm,
303ms
NO
AC
cord,
$1
T1,D1,1C1
Q1,C1
~C5
R1~R4,
DS
1C301,
VR301
R301,
C301
1C301,
D301
~
306
$301
~
306
$307,
701
1€101,
1C201
R204,
R208
1€301,
1C201
1.
DC
voltage
at
terminal
i)
of
1C301.
(OV),
At
stop
4.8V
NO
ie161.-8309
2.
DC
voltage
at
terminal
10
of
1C201.
(OV),
At
stop
4.8V
C107
5
3.
DC
voltage
at
termina!
(2
of
1C201.(0.6V),
At
stop
OV
ves}
Drive
coil
and
Hall
element
; ;
1.
Conduction
check
of
drive
coils.
(About
339)
NO
Drive
coil
2.
DC
voltage
of
Hall
elements.
H101,
H102
@
3.8V,
@
7.6V,
@
3.8V,
@
OV
1€101
|
ae
YES
1
r
3
7
Drive
circuit
(Stop)
1.
DC
voltage
at
each
terminal
of
1C101.
NO
—
~—>
1C101
®
©[®/@l
ol
w[
a
Voltage
x
11.7V
7m
oN
ov
|
ov
|
ov
|
ov;
ov
[6v
YES
}
Drive
circuit
(Rotation)
1.
DC
voltage
at
each
terminal
of
1C101.
NO
1C101
Unsatable
rotation
Arm
motor
does
not
rotate
Cueing
down/
up
does
not
work
FG
amplifier
circuit
1.
Conduction
check
of
FG
coil.
0.1
2.
Waveform
of
terminal
(5;
of
45V
33rpm
20ms,
45rpm
14ms
1€201.
YES
iq
FG
coil
1201,
R203
R205,
C201~203
Quartz
oscillator
circuit
1.
Waveforms
of
terminals
@
and
@
of
1C201.
Terminal
>
Terminal
@)
X201,
10201
C204~206
fav
2V
2.2V
0.24
ne
1.9us
YES
{
Speed
and
phase
control
circuit
1.
Waveform
of
terminal
14
of
1C201
*
Stable
*
Slow
"Fast
——
4
SLL,
33rpm
20ms
(50.5
Hz)
2.
Waveform
of
terminal
43:
of
1C201.
*
|n-phase
“
Phase
lead
33rpm
10ms
(101
Hz)
*
Phase
lag
NO
1C201
1C101
Motor
control
circuit
1.
DC
voltage
at
each
terminal
of
1C301
1C301,
401
Motor
1.
DC
voltage
at
terminal
@
and
@
of
1C301
Terminal
@).
.
.
.During
cueing
and
down
(0.8V)
Terminal
@).
. .
.Only
during cueing
down
(1.8V)
©
2.
DC
voltage
of
Q302
of
collector
’
12V
Cueiing
down
QV
1V
10]
Cueing
control
circuit
1C301,
$305
Q301,
302
Cueing
Plunger

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