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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
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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