Technics SL-QX300

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@ SCHEMATIC DIAGRAM _ (thisschematic diagram may be modified at any time with the development of new technology.)
1 2
3 4 5 6 7 8 9
$302,0N $302, OFF A 33rpm, |Oms. ( 1O1Hz)
iSV
2V
asrpm,
7me
(136.5Hz)
VR302
Center
© © O.5V 1.9ps.(524.1kHz)
‘,
5
t
eS301
—
--OFF
A
}
|
=
VR30O2
Center
av
-
a
a
iy
137
ps
(728kHz)
|
5V
1 3V
oS
7)
ty
if?
aad
preteen
ag
9 wat
ll
VR302
Center,
|
9ys(524.1kHz)
6
2
CURSE
riiveptaaetiiy
10302
Veale
Tso
ago
IC
|
&
p2
23
1.9ps.(524.1kHz)
D3
\
MN4011B
*S20—-
fe
ia
AN78I5
MAIO9|
\
MAIOD5I
\
PITCH
CONTROL
/
5V
REGULATOR
01
9.1V
ZENER
\
5.1V
ZENER
\
ON/OFF
SELECT
\
L.Qys.(524.1kHz)
(ON/OFF)
"
POWER
eS30!I———
OFF
SI
|
5
VR302
Center,
|.9us(524.|kHz)
VR302
-°/e,2,04y5(490k
Hz
)
VR302+ %, 1.791 5(558.2kHz)
¢S30I---ON, 5V
© S$30I---OFF,OV
*S30I-- -ON, 5V
AL Se
(En continental
Europe ) A ‘i
r x 1.9us.(524.1KHz)
AC220V
O
i
(50/60H 8 e S301 --- OFF,5V
' « *S30I---ON
D P=|_0-022T [<i IS] ~
WO} hal #S301--- OFF,4V tS
Cc
“4
fai
Tih
>
peawurat
“ie
©
Na
ass
al
AN
re
KNO@OQOODO)
-
J)
(J)
Gd)
()
1.9us.(524.1kHz
)
DI D201,202 t+ Q40! Q201 D203,204 \ Reference frequency rT yy
SVDSIWB40 SVDPR5731K 1} 2sa830 2SD638 SVDEBR5505$ edlustment
RECTIFIER
SPEED
SELECTOR
+
+1
SOLENOIDDRIVE
STROBE
DRIVE
STOROBE
\
oe OQOOSOOSO} \
= ‘ Hae nage eee
I | | {
e ROTATION Bey
20ms(50.5Hz)
B5V | ,
D Co
H1IO1,102 ° STOP @ ROTATION io D301
33 Oms (10 ) Ov '
OHOO2H
5.6V
asrpm
"7ms
(1365Hz)
/
SVDPRS705S
e
HALL
ELEMENT
4
PITCH
CONTROL
RESET
=|M
ie)
é%
5.2V
\
@
ROTATION
a
.238
i
Looe
sv
q
Pasa
ias
+
S a Av 2.4V
A) ™
wo 2.2V
rT TC
af toe = v
E
el
'
Notes:
OV_ 6V_Z8V 39V 39V 39V 39V OV 83V 45V 45V 45V B5V Teed : On ae ae ere
EILFOICFR TN A SICEDCmemireniremiieey “|| fi ge ee:
IC10l
DRIVE
ic201_
AN6683
controt
3.
$301,
;
Pitch
control
reset
switch
in
“off"’
iti
T i : position.
CPT IC As IAS I Az ICAL ICCS IPCI oO 4. $302 : Start/stop switch.
OV
OV
OV
OV
OV
I5V
OV
I5V
:
i
5. $401 : Voltage selector switch in “110V — 120V”
19s position.
(524.1kHz) 6. The voltage value, and waveforms are the reference
Babeasn Al anane ae a voltage values of this unit measured by DC electronic
Between A3 and A4 Be voltmeter (high impedance) and oscilloscope on the basis
3Vv of chassis when the unit is in play.
F ) aa lOms(1O1Hz) ov} ( ) is the voltage when turntable is in rotation.
7. Important safety notice:
33rpm 303ms (3.3Hz) ‘ { 7 Components identifier by A\ mark have special
= characteristics important for safety. When replacing any
™~ of these components, use only manufacture’s specified
VR302 Center, |.9us(524.1kHz) +t
VR302 — %%,204ys(490kHz) Patt :
VR302 + %,1.79ps(558.2kHz) 8. +B voltage lines.