Technics SL-BD22D

Unstable
rotation
Turntable
rotates too fast
or does not
rotate.
FG amplifier circuit
1, Waveform of terminal
@ of CN101
wo
Z601 (Magnetic
resistor
element)
1€101 (Control IC)
R101~R103
C101~C103
Motor
2. Waveform of terminal
@
of
IC101
J av
1.4V
33 rpm 3.3ms
45 rpm 2.5ms
33pm 3.3ms
45 rpm —-2.5ms
a eas
Control circuit
1. Waveform of terminal
@® of 10101
FUP
33 rpm 3.3ms
45 rpm_—_2.5ms,
2. Waveform of terminal
@ of 1C101
AV be
33 rpm 3.3ms
45pm .2.5ms
1,
Waveform
of
terminal
of
CN101
3+0.8V
At=S% more than
(0.17ms) 120mV
t
Refer
to
precaution
on
page
5.
3.3ms
©
Terminal
guide
of
IC's,
transistors
and
diodes
SVIBA6301
y
AN78L06 SVDBRSSO5SA
SVDBRS505SB
&
V
input
Ne | fw.
2801423
2SA1309
ee
Uf,
SVD1SR35200V 2801383
SVD1SS254
c
or :
Caution!
IC and LS! are sensitive to static electricity.
Secondary trouble can be prevented by taking care during repair.
® Cover the parts boxes made of plastics with aluminum foil.
® Ground the soldering iron.
© Put a conductive mat on the work table.
* Do not touch the legs of IC or LSI with the fingers directly.
—g9-—
+}
'C101
(Control
IC)
defective
If the reading is =, then Z601
If the reading is 1.3kQ, then
1.
Conduction
check
of
CN101
terminal
of
@
and
©.
©
detective.
and
©.
motor
defective.