Technics SL-Q303 User manual

ORDER NO. $D81061948C4
Service
Manual
CQUARTZ Turntable System
SL-Q303
Areas
[PA],
[ [PE],
],
[PC]
* [PA] is available in far East PX.
* (PE] is available in European Military. =
* {PC] is available in European Audio Club.
[PC]
*The colors of this model included silver and black.
* The black type model is provided with (K) in the
Service Manual.
Please use this manual together with the service manual for model No. SL-Q303/SL-0303 (K),
Order No. SD81061944C8.
Specifications Specifications are subject to change without notice for further improvement.
Weight and dimensions shown are approximate.
@ General ®@ Tonearm section
Power supply: ~110-120/220-240V, 50 or 60 Hz Type: Universal tonearm
Power consumption: 7 W S"' shaped tubular arm
Dimensions: 43x 10.6x37.5cm Static balanced type
(WxHxD) (16-15/16 ''x4-3/16''x 14-3/4'') Effective length: 230 mm (9-1/16"')
43x 37x42 cm Overhang: 15 mm (19/32"’)
(16-15/16"' x 14-9/16" x 16-17/32"") Tracking error angle:Within 2°32’ at the outer groove
Maximum height when top of 30 cm (12"’) record
(dust cover) is open. Within 0°32’ at the inner groove
Weight: 6.5 kg (14.3 Ib.) of 30 cm (12")) record
Friction: Less than 7 mg (lateral, vertical)
@ Turntable section Effective mass: 11 g (without cartridge)
Type: Quartz direct drive Stylus pressure
Automatic turntable adjustment range: 0-2.5 9
Automatic start Applicable cartridge
Auto
return
weight
range:
3.5—7.5g
Auto stop
Repeat play Headshell weight: 7.5g
Manual play Phono cable
Drive method: Direct drive capacitance: 135 pF
Motor: Brushless DC motor ;
Drive control method: Quartz-phase-locked control @ Cartridge section ; .
Turntable
platter
Aluminum
die-cast
Type:
Moving
magnet
stereo
cartridge
Diameter 31.2 cm (12-9/32" inches) Frequency response: 20 Hz to 25 kHz
Output voltage: 2.5 mV 1 kHz,
Turntable speeds: 33-1/3rpm and 45 rpm
5 cm/s. zero to peak lateral
Wow and flutter: 0.012% WRMS« eat
0.025% WRMS (JIS C5521) velocity
+0.035% peak (IEC 98A Weighted) (7 Lane De TBI ae S00)
*This rating refers to turntable assembly alone, ee sis velocity |
excluding effects of record, cartridge or tonearm, Channel Sorararion: 22 dB 1 kHz
butincluding platter. Measured by obtaining signal Channel balance: Within 2 dB at 1kHz
from built-in frequency generator of motor assembly. Load impedance: 47 kQ to 100 ke
Stylus pressure: 1.75+0.25 g (17.5+2.5 mN)
Replacement stylus: EPS-74STSD (ATN71)
Rumble: — 56 dB (IEC 98A Unweighted)
~ 78 dB (IEC 98A Weighted)
Panasonic Tokyo
@
i echnics Matsushita Electric Industrial Co., Ltd. Matsushita Electric Trading Co., Ltd.
1-2, 1-chome, Shinbashi, Minato-ku, Tokyo 105 Japan P.O. Box 288, Central Osaka Japan

SL-Q303
@ REPLACEMENT PARTS LIST
Change of Part No.
(Ki - marked parts are used for black type only.
SL-Q303/0303 (K) SL-@303/0303 (K)
(ORDER NO. SD81061944C8) [PA, PE, PC]
Part Name & Description
Remarks
at Ee
CAPACITORS
E
A473MZ
Polyester,
250VAC
CQE2A473M
ECQE2A473Mz
|
Po
yester
‘
ECQU2A473MF
0.047uF,
+
20%
[
CABINET and CHSSIS PARTS
SJA141
SFPEN3302
was [| Adan SSCS
SJA139
SJA83
AC
Cord
1
SJA137
SFUMQ34NO09
FUMQ@34N
Bushing,
A
,
SFUMQ34NO1
s
09
|
ushing,
AC
Cord
She
SFNNQ34S01
SFNN@34P01
[PA,
PE]
Name
Plate
|
1
O
SFNNQ34G02
|
ta
ae
SFNNQ@34P01
[PC]
Name
Plat
i
1
O
e e
SFNNQ34R01
|
ame
Pla
TONEARM
PARTS
ss
|_|
ePc—u25s
EPC74SMAD
Cartridge
|__|
ePs—25cs
EPS74STSD
Stylus
1
SCREW
and
NUT
1n25
|
|
sFczvssoo
SFPEV7803
Screw,
Cartridge
2
Nut, Cartridge
ACCESSORIES
SFNUQ34P01
Instructions Book, Printed Matter 1 oO
SFNUQ34S01
Deletion
QJPO603S
Addition
2 Pin Plug 0
Adaptor, Gimens 1
PACKING PARTS
SFNUQ34G01
O | SFHPQ34m01 SFHPQ34M01
SFNUQ34Xx01
SFDK119118
SFHPQ34M21
[PC] only
© | SFHP@34C01
(Ki SFHPQ34M21
Carton Box (Silver) 1
| Carton Box (Black) 1
Printed in Japan
81070450) TK/YW

* The colors of this model include silver and black.
* The black type model is provided with (K) in the
Service Manual.
English
Specifications
@ General
Power supply: ~110-—120/220-240V, 50 or 60 Hz
Power consumption: 7W
Dimensions: 43x 10.6x37.5cm
(WxHxD) (16-15/16"' x4-3/16''x 14-3/4"')
43x 37x42cm
(16-15/16''x 14-9/16"' x 16-17/32"')
Maximum height when top
(dust cover) is open.
Weight: 6.5 kg (14.3 Ib.)
@ Turntable section
Type: Quartz direct drive
Automatic turntable
Automatic start
Auto return
Auto stop
Repeat play
Manual play
Drive method: Direct drive
Motor: Brushless DC motor
Drive control method: Quartz-phase-locked contro!
Turntable platter Aluminum die-cast
Diameter 31.2 cm (12-9/32"’ inches)
33-1/3 rpm and 45 rpm
0.012% WRMS»*
0.025% WRMS (JIS C5521)
+0.035% peak (IEC 98A Weighted)
Turntable speeds:
Wow and flutter:
‘Technics
Service Manual
ORDER NO. SD81061944C8
COUARTZ Turntable System
SL- Q303
[E], [EK], [XL], [EG], [EB],
[EF], [XA], Dea [EH], (Ei), [EC]
SL-Q303(K)
[E], [XL], [XA], =
Areas
* [E] is available in Switzerland and Scandinavia.
* [EK] is available in United Kingdom.
* [XL] is available in Australia.
* [EG] is available in F.R. Germany.
* [EB] is available in Belgium.
* [EF] is available in France.
* [XA] is available in Southeast Asia, Oceania, Africa,
Middle Near East and Central South America.
* [XM] is available in Central South America.
* [EH] is available in Holland.
* [Ei] is available in Italy.
* [EC] is available in Czechoslovakia.
Specifications are subject to change without notice for further improvement.
Weight and dimensions shown are approximate.
*This rating refers to turntable assembly alone,
excluding effects of record, cartridge or tonearm,
but including platter. Measured by obtaining signal
from built-in frequency generator of motor assembly.
Rumble: —56 dB (IEC 98A Unweighted)
~ 78 dB (IEC 98A Weighted)
@ Tonearm section
Universal tonearm
“S" shaped tubular arm
Static balanced type
Effective length: 230 mm (9-1/16"')
Overhang: 15 mm (19/32"’)
Tracking error angle:Within 2°32’ at the outer groove
of 30 cm (12"') record
Within 0°32’ at the inner groove
of 30 cm (12"') record
Less than 7 mg (lateral, vertical)
11g (without cartridge)
Type:
Friction:
Effective mass:
Stylus pressure
adjustment range: 0-2.5g
Applicable cartridge
weight range: (See page 14)
Headshell weight: 7.5g
Phono cable
capacitance: 135 pF
Matsushita Electric Trading Co., Ltd.
P.O. Box 288, Central Osaka Japan

@ Cartridge section
Type:
Frequency response:
Channel separation:
Channel balance:
Compliance (dynamic):
Stylus pressure:
22 dB at 1 kHz
Within 1.8 dB at 1 kHz
10x 10-6 cm/dyne at 100 Hz
1.75+0.25g (17.5+2.5 mN)
47 kQ) to 100 kQ)
Moving magnet
10 H2~35 kHz
20 Hz~10 kHz +1 dB
2.5 mV at 1 kHz
Output voltage:
5 cm/s. zero to peak lateral
velocity
(7mV at 1 kHz 10 cm/s. zero to
peak 45° velocity [DIN 45 500])
Deutsh
@ Allgemeine Daten
Stromversorgung:
~110-120/220-240
V,
50/60
Hz
Wechselstrom
Leistungsaufnahme:
7W
Abmessungen
(BxHxT):
43x10,6x37,5cm
43x
37x42
cm
Maximale
Hohe
bei
geéffnetem
Oberteil
(Staubabdeckung).
Gewicht:
6,5
kg
@ Plattenspieler
Typ:
Quarz-Direktantrieb
Automatischer
Plattenspieler
Startautomatik
Ruickfihrautomatik
Stopautomatik
Wiederhol-Betrieb
Manueller
Betrieb
Direktantrieb
Kollektorloser
Gleichstrommotor
Quarz-Steuerung
QPL
Aluminium-SpritzguB
Durchmesser
31,2
cm
Antrieb:
Motor:
Antriebsregel-Methode:
Plattentelier:
Piattenteller-
Drehzahlen: 33-1/3 und 45 U/min
Gleichlaufschwan-
kungen:
0,012
%
WRMS*
0,025% WRMS (JIS C5521)
+0,035% Spitze (IEC 98A bewertet)
“Diese
Nennleistung
bezieht
sich
auf
das
Laufwerk-Bauteil
allein,
ausschlieBlich
Einflisse
von
Schallplatte,
Tonab-
nehmer
oder
Tonarm,
aber
einschlieBlich
Plattenteller.
Gemessen
anhand
von
Signalen
vom
eingebauten
Frequenz-
generator
des
Motorbauteils.
Rumpel-Fremd-
Spannungsabstand: —56 dB (IEC 98A unbewertet)
Rumpel-Gerausch-
Spannungsabstand: —78 dB (IEC 98A bewertet)
TECHN ISCHE DATEN Anderungen de technischen Daten vorbehalten.
Die
angegebenen
Gewichts-
und
Abmessungsdaten
sind
circa
Werte.
Load impedance:
Weight:
Replacement stylus:
@ Tonarm
Typ:
Effektive Lange:
Uberhang:
Spurfehlwinkel:
Lagerreibung:
Effektive Masse:
Auflagekraft-
Einstellbereich:
Zulassiger Ton-
abnehmer-
Gewichtbereich:
Tonarmkopf-Gewicht:
Phonokabl-Kapazitanz:
@ Tonabnehmer
Typ:
Frequenzgang:
Ausgangsspannung:
Kanaltrennung:
Kanalabweichung:
Nachgiebigkeit
(dynamisch):
Auflagekraft:
Impedanz:
Gewicht:
Ersatznadel:
5 g (cartridge only)
EPS-25CS
Equivalent replacement stylus
EPS-25ES (Elliptical stylus). }
Universal-Tonarm
S-férmiger Rohrtonarm
Statisch ausbalanciert
230mm
15mm
2°32’ bei der Einlaufrille einer
30 cm-Platte
0°32’ bei der Auslaufrille einer
30 cm-Piatte
Weniger als 7 mg
(horizontal, vertikal)
11 g (ohne Tonabnehmer)
0—2,5g
(Siehe. Seite 14)
7,59
135 pF
Magnetischer Tonabnehmer
10 Hz bis 35 kHz
20 Hz bis 10 kHz+1 dB
15 mV bei 1 kHz
5 cm/s. Null-zu-Spitze, lateral
[7mV bei 1 kHz 10 cm/s. Null-
zu-Spitze, 45° (DIN 45 500)]
22 dB bei 1 kHz
Innerhalb 1,8 dB bei 1 kHz
10x 10°€ cm/dyn bei 100 Hz
1,75+0,25 g (17,5+2,5 mN)
47 kQ bis 100 kQ
5 g (nur Tonabnehmer)
EPS-25CS
(Gleichwertige Ersatznadel
EPS-25ES.)

Francais
CARACTERISTIQUES
@ Géneéralités
Alimentation: Alternatif 110-120/220-240V,
50 ou 60 Hz
Consommation: 7W
Dimensions: 43x10,6x37,5cm
(LxHxP) Hauteur maximum lorsque le
dessus (couvercle protége-
poussiére) est ouvert.
43x37x42 cm
Poids: 6,5kg
@ Platine de lecture
Type: Entrainement direct a quartz
Piatine automatique
Démarrage automatique
Retour automatique
Arrét automatique
Audition répétée
Audition 4 commande manuelle
Systeme d’entraine-
ment: Entrainement direct
Moteur: Moteur C.C. sans balai
Groupe de réglage: Réglage d’accrochage de phase
par quartz
En aluminium moulé sous pression
Diamétre 31,2 cm
Vitesses de rotation: 33-1/3 et 45t/p.m
Pleurage et scintille-
ment: 0,012% de valeur efficace*
0.025% de valeur efficace
(JIS C5521)
+0,035% de créte
(IEC 98A Pondéré)
Plateau de lecture:
“Ce régime nominal se rapporte a |’ensemble du tourne-
disque seul, exciuant les effets du disque, de la cellule
pick-up ou du bras de lecture, mais comprenant le plateau,
Mesuré par I’obtention d'un signal provenant du généra-
teur de fréquences incorporé de |’ensemble du moteur.
— 56 dB (IEC 98A Non pondéré)
—78 dB (IEC 98A Pondéré)
Ronflement:
Espafiol
ESPECIFICACIONES
Les spécifications sont susceptibles d’étre modifiées sans préavis.
Le poids et les dimensions donnés sont approximatifs.
@ Bras de lecture
Type: : Bras de lecture universel
Bras tubulaire en forme de ‘‘S”’
De type a équilibrage statique
Longueur effective: 230 mm
Porte-a-faux: 15mm
Angle d’erreur de piste: En deca de 2° 32’ au sillon
extérieur d'un disque de 30 cm
En dega de 0° 32’ au sillon
intérieur d’un disque de 30 cm
Moins de 7 mg (latéral et vertical)
11 g (sans la cellule pick-up)
Frottement:
Masse réelle:
Plage de réglage de la
pression d’appui:
Gamme du poids des
cellules pick-up
utilisables:
Poids de la coque
porte-cellule: 7,59
Capacitance propre
du cable pick-up: 135 pF
0-2.5g
(Voir page 14.)
@ Cellule pick-up
Type: Aimant mobile
Réponse en fréquence: 10 Hz a 35 kHz
20 Hz a10kHz+1dB
2,5mV a1kHz; 5cm/s., zéroa
vitesse latérale de créte
(7mV a1 kHz
10 cm/s., zéro a vitesse 45° de
créte [DIN 45 500])
22 dB a 1kHz
Tension de sortie:
Séparation de canal:
Equilibrage des
canaux: En deca de 1,8 dB a1 kHz
Elasticité (dynamique): 10 x 10-6 cm/dyne a 100 Hz
Pression de la pointe
de lecture: 1,75+0,25g
(17,5+2,5 mN)
Impedance de charge: 47k‘) to 100 ki)
Poids: 5g (cellule seule)
Pointe de lecture de
remplacement: EPS-25CS
( Pointe de lecture de oo)
équivalente: EPS-25ES
Las especificaciones quedan sujetas a cambios sin aviso previo.
EI peso y las dimensiones indicados son aproximados.
@ En general
Alimentacion de
corriente: ~110-120/220-240 V,
50 6 60 Hz
Consumo de corriente: 7 W
43x10,6x37,5cm
43x37x42cm
Altura maxima cuando la parte
de arriba (tapa contra el polvo)
esta abierta.
6,5 kg
Dimensiones:
(Anchox Alto x Prof.)
@ Seccion del plato giratorio
Tipo: Accionamiento directo por cuarzo
Plato giratorio automatico
Arranque automatico
Retorno automatico
Parada automatica
Ejecucién repetida
Ejecuci6én manual
Método de acciona-
miento: Accionamiento directo
Motor: Motor de corriente continua sin
escobillas

Método de control de
accionamiento: Control enclavado de fase de
cuarzo
Platillo del plato
giratorio: Aluminio fundido
Diametro 31,2 cm
Velocidades del plato
giratorio: 33-1/3 y 45 rpm
Ululaciones y trémolo: 0,012% WRMS”*
0,025% WRMS (JIS C5521)
+0,035% cresta
(IEC 98A Ponderado)
“Estas caracteristicas se refieren unicamente al conjunto
del plato giratorio, con exclusi6n de los efectos
provenientes del disco, cartucho o del brazo sonoro,
incluyendo, empero, el platillo. La medida fue tomada por
medio de la sefal obtenida del generador de frecuencia
incorporado del conjunto del motor.
Ruido de rodadura: ~56 dB (IEC 98A No ponderado)
— 78 dB (IEC 98A Ponderado)
® Seccidn del brazo sonoro
Tipo: Brazo sonoro universal
Brazo tubular en forma de ‘‘S"
Tipo equilibrado estatico
Longitud efectiva: 230 mm
Proyeccion: 15mm
Angulo de error de
seguimiento: Inferior a 2°32’ en el surco
exterior de un disco de 30 cm
Inferior a0°32’ en el surco interior
de un disco de 30 cm
@ CONTENTS
Page
LOCATION OF CONTROLS.........-..000 cee eeese 5
TECHNICAL EXPLANATION...........-.202005 6,7
DISASSEMBLY INSTRUCTIONS ............... 8~10
REPLACEMENT OF HALL ELEMENT...............- 10
MEASUREMENTS AND ADJUSTMENTS (English)........ 11
MESSUNGEN UND JUSTIERUNGEN (Deutsch) ......... 12
MESURAGES ET REGLAGES (Frangais)............ 12, 13
MEDICIONES Y AJUSTES (Espafiol).............- 13,14
CARTRIDGE INSTALLATION ............-.00000s 14
ABOUT
CARTRIDGE
WEIGHT
............000000%
14
Friccion: Menos de 7 mg
(en sentido lateral y vertical)
Masa efectiva: 11g (sin cartucho)
Radio de ajuste de la
presion de laaguja: 0a2,5qg
Radio de peso de
cartucho utilizable: (Véase en la pagina 14)
Peso de la capsula de
la cabeza: 7,59
Capacitancia de
cable de fono: 135 pF
Seccion del cartucho
Tipo: Iman movil
Respuesta de
frecuencia: de 10 Hz a 35 kHz
de 20 Hza10kHz+1dB
2,5mVa1kHz
Con velocidad lateral
de cero a cresta de
5cm/s
[7 mV a 1 kHz Velocidad de
45° de cero acresta de
10 cm/s (DIN 45 500)}
Separacion de canales: 22 dB a 1 kHz
Equilibrio de canales: Sin exceder 1,8dBa 1 kHz
Elasticidad
(dinamica): 10x 10°76 cm/dina a 100 Hz
Presion de la aguja: 1,75 +0,25 9 (17,5 +2,5mN)
Impedanciadecarga: 47k{)a 100k!)
Peso: 5 9(cartucho sélo)
Aguja de recambio: EPS-25CS
ae de recambio spene!)
Voltaje de salida:
EPS-25ES.
Page
CIRCUIT BOARD AND WIRING
CONNECTION DIAGRAM ............000c008 15, 16
SCHEMATIC DIAGRAM ...........0000 ee eae 17~19
BLOCK DIAGRAM. ............0 00. ccc eeeeeee 20
TROUBLE SHOOTING GUIDE .............000% 21 ~23
REPLACEMENT PARTS LIST
Electrical Parts. 2... ce ee 23, 24
Cabinet,
Chassis
and
Packing
Parts...
.---.-++.-
25,
27,29
EXPLODED VIEWS .......... 0.2.0 ce cua eveene 25 ~29
PACKINGS a: 556) 5 fa cecfepes dio epee. eta Sasa ilar Sete ue Bh edd 30

m LOCATION OF CONTROLS
Counterweight
Hinge ~ gh
Headshell stand
Weight ring
Anti-skating control
Turntable base
Turntable
mat
Arm
rest
Record
size
sensor
Arm clamp
Center
spindle
Tonearm
Turntable platter Locking sleeve
Headshell/
cartridge
Strobe-illuminator/
pilot lamp
Start/stop switch
Power switch (off @ , on = )
Speed selectors
Cueing control
Repeat switch (off M, on =)
Automatic mechanism plate-
Main base Arm base
Hall element (H1, H2)
Tonearm
Drive circuit P.C.B
Controt IC (1C201)
Drive 1C (1C101)
-Power switch (S402)
Repeat switch
Speed selector P.C.B.
Cueing lever
Strobe LED P.C.B.
Cueing rod
Repeat rod
Cueing rink
Power transformer (T1)
Ey Power source circuit P.C.B.

m@ TECHNICAL EXPLANATION
e Principles of Auto Size Detection
This unit employs a mechanical detection system instead of a conventional electrical detection system.
The mechanical system makes it possible to detect the presence of a record and the size (30cm/17cm) of the record.
However, it is unable to detect a 25cm record.
It is detected as a 17cm record. In that case, manual operation is required.
Note:
Playing special records
Follow ‘‘Manual play” for playing the following types of records. (Special records may interfere with correct auto-
matic operation.)
This is not a malfunction of the turntable.
* Non-standard size records (standars size (EIA, IEC, DIN, JIS.) are 17,25 and 30 cm).
(However, 25 cm (10’’) records can not be selected automatically by sensor.)
*Sono-sheets, on light record and thin records.
* Badly warped records.
e Mechanism operation for auto size detection
The mechanism and the part names necessary for auto size detection are shown in Fig. A.
30cm record detection pin
Size detection base
Turntable
17cm record
detection pin Drive cam
Detection pin
\
Record size
Reset lever detection plate
PU fixing plate
Index sub-plate Drop position setting pin @
index plate
Fig. A
Drop position setting pin @
Turntable
rotating '
direction /

Detection of a record
1. When the start button is pressed without putting a
record on the turntable, the drive cam rotates in the
direction of arrow @ to turn the index sub-plate in the
direction of arrow @). At that time, the index plate
moves in the same manner as the index sub-plate.
(See Fig. A)
2. The record size detection plate interlocked with the
index sub-plate rotates in the direction of arrow oe.
(See Fig. A)
3. Then, the reset lever of the size detection base, attached
to the turntable, is pushed by the record size detection
plate and moves in the direction of arrow®.
(See Fig. B)
4. When the reset lever is pushed, the record detection pins
are projected on both inside and outside.
In this case, as both detection pins are up, they do not
touch the index plate even when the turntable rotates.
(See Fig. B, C-a)
5. The index plate does not move when no record is on the
turntable (dotted line in Fig. D). Then, the turntable
rotates 3 times for detecting 3 times. (The same holds
true for record size detection.)
6. When the index plate position has been determined, the
PU fixing plate tends to move the arm, but the arm does
not move because the short drop position setting pin@
of the PU fixing plate touches the no-record detecting
part of the index plate. (See Fig. D)
Detection of 30cm record
1. The operation is the same as for record detection, but as
a record is on the turntable, both inside and outside
detection pins are down. (See Fig. C-b)
2. As the detection pins are down, only the inside detec-
tion pin is down. (See Fig. C-b)
3. The detection pin touches the index plate and pushes
it in the direction of arrow e. Then, the index plate
Position is as shown by the solid line in Fig. D.
4. When the index plate position has been determined, the
PU fixing plate moves the arm inward, but the 30cm
record detecting part of the index plate touches the drop
Position setting pin @ of the PU fixing plate, causing
the arm to drop at the position. (See Fig. D)
Be i
we 30cm record e oF >|
a. No record
30cm record
detection pin
Turntable sheet
17cm record detection
Pin
LLL Turntable
Reset lever Detection pin
b. 30cm record detection
Record
SSSSSSSSSSSSSS SSSA SAE SS pa and FSD
1, NY ( TS ES
Fig. C
Detection of 17cm record
1. In the case of 17cm record, the outside detection pin is
up and the inside pin is down. Therefore, both detec-
tion pins are down. (See Fig. C-c)
2. The detection pin touches the index plate to push it in
the direction of arrow @. In this case, the index plate
position is as shown by the broken line in Fig. D.
(As both detection pins are down, the index plate is
pushed much more than in 30cm.)
3. When the index plate has been determined, the PU fixing
plate moves the arm inward, but the 17cm record detec-
ting part of index plate touches the drop position setting
pin @ of the PU fixing plate, causing the arm to drop at
the position. (See Fig. D)
PU fixing plate
Pin@
30cm record
17cm record
Index plate
Fig.D

DISASSEMBLY INSTRUCTIONS
® How to remove the main base and cabinet
1.
2.
3.
4,
5.
11,
Fix the tonearm on the rest.
Remove the headshell and counter weight.
Remove the turntable.
Remove the panel cover setscrews @ ~ © and earth
lead setscrew@. (See Fig. 1)
Remove the connectors @ and @ of the drive circuit
P.C.B.. (See Fig. 1)
. Close the dust cover, and turn over the unit, taking
care not to scratch it.
. Remove the insulator setscrews @ ~ @ and phono
cord clamper setscrew @. (See Fig. 2)
Turn the unit up, holding the main base and cabinet.
Remove the dust cover.
Remove the tonearm from the rest, shift the tonearm
inward, and lift the cabinet. Then, the main base and
cabinet can be disassembled. (See Fig. 3)
When assembling the main base and cabinet, make sure
that the cueing lever of the arm base is engaged with
the cueing ring of the cabinet. (See Fig. 4)
Panel cover
Cabinet
oF
aise Se %
Drive circuit P.C.B.
Fig. 1
* The insulator spring (black) at this position is different
from other three springs.
o
ah
beg
e- Insulato =
1
° spring
Main base
Fig. 2
Cueing rink
Cueing lever
Fig. 4

How to remove the drive circuit P.C.B. and stator
frame
. Remove the main base and cabinet. (Refer to “How to
remove the main base and cabinet’”’.)
2. Remove the drive circuit P.C.B. setscrews @ ~@®.
(See Fig. 5)
3. Remove the stator frame setscrews @ ~ @ .
Remove the regulator transistor (Q3) setscrew @) and
connector @. Then, the drive circuit P.C.B. can be
separated from the stator frame. (See Fig. 5)
4. When removing the drive circuit P.C.B. and stator frame
together, remove the connector @ and setscrews @~
@ . (See Fig. 5)
e How to remove the arm base and tonearm
. Separate the main base from the cabinet. (Refer to
“How to remove the main base and cabinet”’.)
2. Remove the arm base setscrews @) ~ @. Then, the arm
base can be removed. (See Fig. 6)
3. When removing the tonearm, turn over the arm base and
remove the PU fixing plate setscrew @ and canceller
spring. (See Fig. 7)
4. Remove the phono output P.C.B. setscrew @ and un-
solder the 5 lead wires from the tonearm. (See Fig. 7)
PU fixing plate
Canceller
spring
Cueing lever
Tonearm
Fig. 7
y Spacer ,
Automatic
Regulator mechanism plate
transistor 8) yy
Fig. 5
Anti-skating
control knob
Arm lift Arm base
Fig. 6
5, Remove the tonearm setscrews @ and @ .
Then, the tonearm can be removed in the direction of
the arrow. (See Fig. 7)
6. When removing this lift base plate, remove the arm lift
setscrew @) before tuning over the arm base, and then
remove the arm lift. (See Fig. 6)
Note: Remove the spring under the arm lift at the same
time.
7. Remove the anti-skating control knob. (See Fig. 6)
8. Turn over the arm base and remove the PU fixing plate.
9. Remove the lift base plate setscrews @) and @. Then,
the lift base plate can be removed.
10. Before mounting the arm base, make sure that the auto-
matic mechanism is in the initial stage, and then shift
the cueing lever of the arm base down in the direction
of the arrow in order to make cueing-up. (See Fig. 7)
[9]

e How to remove the automatic mechanism plate
1. Separate the main base from the cabinet. (Refer to ¥—®
“How to remove the main base and cabinet”’.) |
2. Remove the drive circuit P.C.B. and the stator frame.
(Refer to “How to remove the drive circuit P.C.B. and
stator frame”’.)
3. Remove the arm base. (Refer to “How to remove the :
arm base and tonearm”.) ; tO
4. Remove the mechanism plate setscrews @ ~ 9. Then,
the mechanism plate can be removed. (See Fig. 8)
Automatic mechanism plate
e How to replace the electric parts
1. Remove the panel cover. (Refer to ’’How to remove the
main base and cabinet’’.)
2. Remove the drive circuit P.C.B. setscrews @) ~ @ and
connectors @ ~ @. Remove the drive circuit P.C.B.
by lifting it as shown by the arrow. Then, the electric
parts can be replaced. (See Fig. 9)
To replace the regulator transistor (03), the stator frame
must be removed beforehand.
Fig. 9
m REPLACEMENT OF HALL ELEMENT Hall element
When
replacing
the
Hall
element,
note
that
the
Hal!
element
nur
ece
ra
surface
must
be
faced
to
the
magnet
of
the
turntable.
a
The
legs
are
allowed
to
be
reverse
in
position
provided
that
|
the
surface
is
up.
(See
Fig.
10)
Drive
circuit
P.C.B
Fig. 10

m MEASUREMENTS AND ADJUSTMENTS sees English eee
© Arm-lift height adjustment
The arm-lift height (distance between the stylus tip and
record surface when the cueing control is set to the “” V’
Position) has been adjusted at the factory to approximately
5 mm (3/16"). (Fig. 11)
Approx. 5 mm (3/16 ')
If the clearance is too narrow or too wide (because of decd
different cartridge dimensions, for example), turn the ——_
adjustment screw clockwise or counterclockwise. 4
(See Fig. 12)
Clockwise rotation
—distance between the record and stylus tip is decreassed.
Counterclockwise rotation
—distance between the record and stylus tip is increased.
Fig. 11
(Abb. 11)
e Adjustment of automatic start position (Fig. 13)
Note:
The auto-start and auto-return adjustment screw are locat-
ed together. When the tonearm is in or near the arm rest,
the auto-start adjustment screw is visible; (See Fig. 13)
when the tonearm is near the center of a record, the auto-
return adjustment screw is visible. (See Fig. 14)
If the stylus does not land in the lead-in groove, adjust as
follows.
1. Clamp the tonearm to the arm rest.
2. Take off the rubber cap covering the adjustment screw A
section. Rubber cap
Turn the screw with a screwdriver, clockwise or counter-
clockwise as necessary.
If the stylus lands too far in,
—turn counterclockwise.
Fig. 12
Auto-start
If the stylus descends outside the record, adjustment screw
—turn clockwise.
Adjust so the stylus tip lands 1 ~ 2mm in from the edge Fig. 13
of the record. (Abb. 13)
e Adjustment of automatic return position (Fig. 14) Qa
1. Put the stylus protector on the cartridge. <4
2. Take off the rubber cap covering the adjustment screw
section and move the tonearm toward the center of the
record,
on
;
.
Auto-return
Then,
the
auto-return
position
adjustment
screw
will
adjustment
screw
appear.
If the tonearm tends to return to the arm rest before the
play has finished,
—turn counterclockwise.
If the tonearm fails to return after the final groove, Fig. 14
—turn clockwise. (Abb. 14)
@ Overhang adjustment (Fig. 15)
15 mm is the correct overhang for this tonearm. Screw driver
Loosen the screws and move the cartridge forward or zi cue
backward until the distance between the stylus tip and the y- c= |
plug becomes 52 mm (2-3/64”). eee
Tigthen the screws without moving the cartridge. BS Stylus tip |
Adjust the horizontal zero balance, stylus pressure and arm- 52 mm (2-3/64"")
lift height whenever you change the cartridge. Fig. 15
(Abb. 15)
4]

m@
MESSUNGEN
UND
JUSTIERUNGEN
sees
De
ts
Ch
eee
e Justierung der Tonarmlifthohe
Die Tonarmlifthéhe, d.h. der Abstand zwischen Nadelspitze und Schallplattenoberflache bei Liftsteuerungs-Position ““ ¥ ",
wurde werkseitig auf ca. 5 mm eingestellt. (Abb. 11)
Falis der Abstand zu klein oder zu groB ist (z.B. wegen der unterschiedlichen Tonabnehmer-Abmessungen, drehen Sie die
Justierschraube im Uhrzeigersinn oder entgegen dem Uhrzeigersinn. (Abb. 12)
Drehung im Uhrzeigersinn
—Der Abstand zwischen der Platte und der Nadelspitze wird kleiner.
Drehung entgegen dem Uhrzeigersinn
—Der Abstand zwischen der Platte und der Nadelspitze wird grdRer.
e Justierung des Aufsetzpunktes der Automatik (Abb. 13)
Anmerkung:
Die Auto-Start- und die Auto-Riickkehr-Positions-Justierschraube sind zusammen angeordnet. (Abb. 13)
Wenn der Tonarm in der Nahe oder auf der Tonarmablage ist, so ist die Auto-Start-Positions-Justierschraube sichtbar.
Wenn der Tonarm in der Nahe der Plattenmitte ist, so ist die Auto-Riickkehr-Positions-Justierschraube sichtbar. (Abb. 14)
Wenn die Abtastnadel nicht in der Einlaufrille aufsetzt, justieren Sie wie folgt.
1. Befestigen Sie den Tonarm mit der Arretierklammer auf der Tonarmablage.
2. Die Gummikappe abnehmen.
3. Drehen Sie die Justierschraube im Uhrzeigersinn oder entgegen dem Uhrzeigersinn, wie erforderlich.
Falls der Aufsetzpunkt im Wiedergabeteil der Schallplatte liegt.
—Entgegen dem Uhrzeigersinn drehen.
Falls der Aufsetzpunkt auRerhalb der Platte liegt.
—Im Uhrzeigersinn drehen.
Justieren Sie so, da& die Nadelspitze 1 — 2 mm vom Rand entfernt auf der Platte aufsetzt.
e Justierung des Abschaltpunktes der Automatik (Abb. 14)
(Die Gummikappe abnehmen)
. Setzen Sie den Nadelschutz auf den Tonabnehmer auf.
2. Fiihren Sie den Tonarm gegen die Plattenmitte.
Die Justierschraube fiir den Abschaltpunkt der Automatik wird dann sichtbar.
Falls der Tonarm zu frih zuriickkehrt.
—Entgegen dem Uhrzeigersinn drehen.
Falls der Tonarm nach Erreichen der Auslaufrille nicht zuriickkehrt.
—Im Uhrzeigersinn drehen.
=
e Justierung dus Uberhangs (Abb. 15)
Der korrekte Uberhang fiir dieses Gerat betragt 15 mm.
Losen Sie die Befestigungsschrauben und versetzen Sie den Tonabnehmer vorwarts oder riickwarts, bis der Abstand zwischen
dem Stecker und der Nadelspitze 52 mm betragt.
Ziehen
Sie die
Befestigungsschrauben
an,
ohne
dabei
den
Tonabnehmer
zu
verschieben.
Justieren
Sie
die
horizontale
“0’’-Balance,
die
Auflagekraft
und
die
Tonarmlifthéhe
nach
jedem
Auswechseln
des
Tonab-
nehmers.
B@
MESURAGES
ET
REGLAGES
ees
Fan
Ca
iS
@ Mise au point de la hauteur de I’élévateur du bras
La
hauteur
de
I’élévateur
du
bras
(distance
entre
I’extrémité
de
la
pointe
de
lecture
et
la
surface
du
disque,
lorsque
la
com-
mande
de
pose
et
de
relevage
est
a
la
position
“
¥_’’)
a
été
régiée
en
usine
sur
approximativement
5
mm.
(Fig.
11)
Si
l'intervalle
est
trop
étroit
ou
trop
large,
(a
cause,
par
exemple,
des
différentes
dimensions
de
cellules
pick-up),
tourner
la
vis
de
réglage
dans
le
sens
des
aiguilles
d’une
montre
ou
dans
le
sens
inverse.
(Fig.
12)
Rotation
dans
le
sens
des
aiguilled
d'une
montre.
—La
distance
entre
la
surface
du
disque
et
l’extrémité
de
la
pointe
de
lecture
diminue.
Rotation
dans
le
sens
contraire
des
aiguilles
d‘une
montre.
~—La
distance
entre
la
surface
du
disque
et
l’extrémité
de
la
pointe
de
lecture
augmente.

SL-Q303 SL-Q303
e Mise au point de la position de démarrage automatique (Fig. 13)
Attention:
Les
vis
de
réglage
du
démarrage
automatique
et
du
retour
automatique
sont
disposées
ensemble.
(Fig.
13)
Lorsque
le
bras
de
lecture
est
sur
ou
prés
de
I’accoudoir
du
bras,
la
vis
de
réglage
de
démarrage
automatique
est
visible;
lors-
que
le
bras
de
lecture
est
prés
du
centre
d’un
disque,
la
vis
de
réglage
du
retour
automatique
est
visible.
(Fig.
14)
Si la pointe de lecture ne repose pas dans le sillon d’entrée, ajuster de fa maniére suivante.
1. Bloquer le bras de lecture sur le support du bras.
2. Retirer le capuchon en caoutchouc.
3.
Avec
un
tournevis,
tourner
fa
vis
de
réglage
dans
le
sens
des
aiguitles
d’un
montre
ou
dans
le
sens
inverse
selon
la
nécessité.
Si la téte de la pointe de lecture se dépose trop loin du sillon enregistré.
—Tourner dans le sens contraire des aiguilles d’une montre.
Si la téte de ta pointe de lecture se dépose en dehors du disque.
—Tourner dans le sens des aiguilles d’une montre.
Ajuster
de
fagon
a
ce
que
I’extrémité
de
la
pointe
de
lecture
atterrisse
4
1
—
2
mm
a
partir
du
bord
du
disque.
e Mise au point de la position de retour automatique (Fig. 14)
(Retirer le capuchon en caoutchouc.)
. Placer le capot protecteur de la pointe de lecture sur la cellule pick-up.
2. Déplacer le bras de lecture vers le centre de disque.
Alors, la vis de réglage du retour automatique apparaitra.
Si
le
bras
de
lecture
tend
a
revenir
vers
le
support
du
bras
avant
que
I’audition
ne
soit
terminée.
—Tourner dans Je sens contraire des aiguilles d’une montre.
Si le bras de lecture ne peut revenir en arriére aprés le dernier sillon.
—Tourner dans le sens des aiguilles d’une montre.
—
e Réglage du surplomb(Fig. 15)
Le surplomb approprié pour ce bras de lecture est de 15 mm.
Desserrer
les
vis
et
déplacer
la
cellule
vers
I’avant
ou
vers
I’arriére
jusqu’a
ce
que
la
distance
entre
l’extrémité
de
la
pointe
de
lecture
et
la
fiche
soit
de
52
mm.
Serrer les vis sans faire bouger la cellule.
Mettre
au
point
l’équilibrage
zéro
horizontal,
la
force
verticale
d’appui
de
la
pointe
de
lecture
et
la
hauteur
du
bras
élévateur
chaque
fois
que
vous
changez
de cellule.
@ MEDICIONES Y AJUSTES sees E Sp 27 O|
e Ajuste de la altura de elevacion del brazo
La
altura
de
elevacién
del
brazo
(o
sea,
la
distancia
entre
la
punta
de
la
aguja
y
la
superficie
del
disco
cuando
el
contro!
de
colocaci6n
esta
en
la
posicion
“
¥.
)
ha
sido
regulada
en
la
fabrica
aproximadamente
a5
mm.
(Fig.
11)
En
caso
que
et
espacio
libre
fuese
demasiado
estrecho
o
demasiado
abundante
(debido,
por
ejemplo,
a
la
diferencia
en
dimen-
siones
de
los
cartuchos),
girar
e!
tornillo
de
ajuste
hacia
la
derecha
o
hacia
la
izquierda.
(Fig.
12)
Rotacién hacia la derecha
—reduce la distancia entre el disco y la punta de la aguja.
Rotacion hacia !a izquierda
—aumenta la distancia entre el disco y la punta de la aguja.
e Ajuste de la posicion para el arranque automatico (Fig. 13)
Nota:
Los
respectivos
tornillos
de
ajuste
para
arranque
y
retorno
automaticos
se
encuentran
juntos.
(Fig.
13)
Cuando
el
brazo
sonoro
esta
puesto
sobre
el
apoyo
o
cerca
de
éste,
se
dejara
ver
el
tornillo
de
ajuste
del
arranque
automatico;
estando cerca del centro del disco, se dejara ver el de ajuste del retorno automatico. (Fig. 14)
En caso que la aguja no se depositara en el surco de comienzo, regular de la manera que sigue.
1. Sujetar el brazo sonoro al apoyo del mismo con la grapa.
2. Quitar la tapita de goma.
3.
Girar
el
tornillito
de
ajuste
hacia
la
derecha
o
hacia
!a
izquierda
usando
un
destornillador,
segtin
sea
necesario.
En caso que la punta de !a aguja se deposita muy dentro del surco grabado: ,
—Girar hacia la izquierda.
En caso que la punta de la aguja se deposita fuera del disco:
—Girar hacia la derecha.
Regular de manera tal que la punta de la aguja se deposite a uno o dos milimetros del borde del disco.
e Ajuste de la posicién para retorno automatico (Fig. 14)
(Quitar la tapita de goma.)
. Colocar la proteccién de la aguja en el cartucho.
. Mover el brazo sonoro hacia el centro del disco.
Con ello, aparecera el tornillo de ajuste del retorno automatico.
Cuando e! brazo sonoro tienda a volver a su apoyo antes de terminar la ejecucién:
—Girar hacia {a izquierda.
En caso que el brazo sonoro no vuelva después de haber tocado el tiltimo surco del disco:
—Girar hacia la derecha.
NO —
e Ajuste de la proyecci6n (Fig. 15)
La proyeccién correcta para este cartucho es de 15 mm.
Aflojar los tornillos y mover el cartucho para adelante y para atras hasta que la distancia entre la punta de !a aguja y !a clavija
sea de 52 mm.
Apretar los tornillos sin mover el cartucho.
Regular el equilibrio horizontal a cero, la presidn de Ja aguja y la altura de elevaciOn det brazo toda vez que se cambia e!
cartucho.
m
CARTRIDGE
INSTALLATION
Screw
When installing a cartridge, follow the instructions that
came
with
the
cartridge.
Washer
1. Connect the lead wires to the cartridge terminals.
The terminals of most cartridges are color coded.
(Shell weight)
Connect each lead wire to the terminal of the same color. Z
White
(L+)...........
Left
channel
+
z
Blue (L—) ...........+ Left channel — °
Red (R+)..........05 Right channel + , ip,
Green
(R—-)
..........
Right
channel
—
yy
2. Mount the cartridge in the headshell using the screws
provided with the cartridge. (Fig. 16)
m@ ABOUT CARTRIDGE WEIGHT
(See chart below)
Stylus protector
Fig. 16
Cartridges weighing between 3.5 and 7.5 g can be used on
this tonearm (with the headshell and accessory shell weight
supplied).
Allowable cartridge weight.
(included the cartridge mounting screws)
4g 5 6 7 8 9 10 1
Supplied headshell in combination with other parts.
Headshell only (7.59)
>
+S
Shell weight

m@ CIRCUIT BOARD AND WIRING CONNECTION DIAGRAM
_ Ground (Earth) lines
Voltage
adjuster
1
Regow
|
renner
Keomnnsintioninensnnsitesar,
4S gammexenomminadonsmuneaeroe
AC LINE / Seca
Pex 110-120/220-240V
= as (50/60HE)
Start /stop solenoid
RL20{
Tf
Power transformer
BSCE RSE
(white
(White
> 73
5
=
| Sy os
Ss
Strobe
illuminator
(33) (45)
csesessemcc tp
yer
Q202
250636
ANG@680
2SH636
2S8C1328

|_| SCH EMATIC DIAGRAM (This schematic diagram may be modified at any time with the development of new technolgy.)
1
2 3 4 5 6 7 8 9 10
Operation circuit
AGS el Taha]
—)—6
a
1
I
£@
5]
SVDEBR5505S
D202 S{
SVORMIZ Li wl
© ©) @ @) @ () 0203, 204
fi
CN2
Saree
CN3
SVDPR5531K
(Sn 5 (4 (3)? 1
Turntable
drive
circuit
a
+
ai coe
=
Te
eee eer al ee (eee
fon
<=
gs R220
see
elt
|
atest
a
ae
OEE
ey es
ee
an
eee: e | Peeeeeseres:
: 9) 7 4] 7.4) 3 | 0] (06) (0.6) C0} (0.4) (02) 12.71 143) 0371 143)
201 AN6680 5 IC 101 AN6635
2) (27) (3.5) C0] 12) foo
O—O—-D—-O—-D—-O
ae coufuve aes Ee =
ge ae
470P 0.4 (”
wa) fea
aoa
R103 82K
aera = acres ey
gers EEE
Power source circuit
Ac3 0,022 AC4 0.022
Voltage
~ adjuste
N
C LINE
110-120/220-240V
(50/60Hz)
Notes:
3. $3, 4
on
. Importa
Compor
When re
e Refe 5
This ind
1€101 (A
©# |g [elelelelelelelola|
Rea eee eee ee
jee ea
eal
jo fi
| © | 15
| ® base
Dm
}o|

1e development of new technolgy.)
mes
5 6
0203, 204
SVDPR5531K
0205
SVDEBR5505S
Q20!1, 202
2SD636
AG es Power source circuit
Asaoz || Voltage Bi
adjuste
\
AC LINE
A A 110-120/220-24.0V
(50/60Hz)
Notes: e
1. $1 : Arm switch in “‘on” position.
2. $2 : Start/stop switch in ‘‘off’’ position.
(not push condition)
3. $3,4 : Speed selector switch in ‘‘off’’ position.
(not push condition)
S$3....33-1/3r.p.m. S4....45r.p.m.
4. $401 : Voltage adjuster switch in ‘220 — 240V”’ position.
110 — 120<+= 220 — 240V
5. $402 : Power switch in ‘‘on” position.
6. The value in[____]is the reference voltage at stop of turntable,
measured by DC electronic circuit tester (high-impedance) on
the basis of chassis. (S1.... “‘on’’)
Therefore, the measured value may include some error depend-
ing on the internal impedance of DC circuit tester and other
conditions.
7. : +@) voltage line.
8. Important safety Notice:
Components identified by A\ mark have special characteristics important safety.
When replacing any of these compornents, use only manufacturer's specified parts.
e Reference voltage and waveform at each IC terminal (pin)
This indicated voltage values and waveform are measured by oscilloscope at 33 r.p.m. rotation.
{C101 (AN6635)
9.4V
Same as at left
Same as at left
Same as at left
| ster [Wo
aoe le
ae
eae
®
3.5V
(45r.p.m. .. OV)
Ov
(45r.p.m. . .4.0V)
3
°o °o
|
SL-Q303
Terminal guide of transistors and IC’s
AN6635
2SD636
2SD638

SL-Q303
Control circuit
@ BLOCK DIAGRAM
Drive Circuit
8
1C201 (AN6680)
X201
O
9 1C101 (AN6635)
8
Output amp.
°°
6
2
a
a
3
(3)
oO
w
Output amp.
Drive coil &
®
fk
Cy)
Strobe illuminator
9on
8
3
>
as]
¢
g
=
&
3 | RL201
|i Start/stop plunger
$1. off
(Arm switch)
Speed indicator
Oo S2 Ee b (Start/stop)
Rectifier
Power
transformer
SL-Q303
m TROUBLE SHOOTING GUIDE
1. No rotation
te Check point Checking method Possible defects
Power supply circuit Q3 emitter voltage —» 14.3V Q1~3
Di, 2
Constant voltage Q201
circuit
Control circuit
(S/S circuit) 1C201
Q201 emitter voltage —»-9.4V
With arm switch (S1) turned on/off, the voltage
changes of 1C201 terminal @ are as follows:
$1 “on” —7.0V
“oft” —_> OV
Voltage at each terminal of 1C101 (in start mode)
(SVs cis “on’”’)
Terminal] © | @ sal HEF ® ® o | @
Drive circuit
Voltage |13.7/ 9.4| 13.6] 3.3/3.3/ 33/33] 0 | 42/64! 5.
T
@ | ® @|@/|@/|®@
0.6/06| 0 [06/06| 0
Terminal | ® | ©
Voltage |14.3/13.7/14.3/13.6
Note: Besides the above-mentioned defects, burnt-out drive coil is also possible. But if it is on one phase, the motor
rotates although the driving torque is halved. Also, it is possible that both Hall elements are defective.
2. Abnormal rotation
— Check point Checking method Possible defects
FG amplifier circuit Solder lead wire to terminal @3) of 1C201; remove Q203
it from the bottom plate and measure the waveform 1C201
in the state of rotation. (See Fig. 17) FG coil pattern
20ms
breakage
4 . ; \ VA 0.4V
2.8V
oe ee HG V
Voltage of 1C201 terminal (?) 5.1V
Control circuit
(Reference voltage circuit)
Lead wire
ae
Drive
circuit
P.C.B.
Fig. 17
SL-Q303
3. Unstabl
2 Contro
(Brake,
Note: Besided |
turntaq
eHow to check
Instrument
1. CR oscillator
2. Oscilloscope
3. 50V 1uF eleq
|
Fz |

LAs
SL-Q303
m TROUBLE SHOOTING GUIDE
1. No rotation
| Check point Checking method Possible defects
Power supply circuit Q3 emitter voltage —»14.3V Q1~3
D1,2
Constant voltage Q201 emitter voltage —»-9.4V Q201
circuit
Control circuit With arm switch (S1) turned on/off, the voltage S1
(S/S circuit) changes of IC201 terminal (9) are as follows: 1€201
$1 “on" —*7.0V
“off” —~ 0V
Drive circuit Voltage at each terminal of 1C101 (in start mode)
(ST... “on'’)
Terminal | @ @1® @|9|© olel@ @® | @
Voltage |13.7| 9.4/13.6| 3.3 | 3.3 | 3.3 | 3.3 42/64/51
Terminal] @ | @ | ® | @ | @ a D2 ®@
Voltage hashisoiie shoe 06/06] 0 [06/06] 0 | 80
Slol®
~
a
Note: Besides the above-mentioned defects, burnt-out drive coil is also possible. But if it ison one phase, the motor
rotates although the driving torque is halved. Also, it is possible that both Hall elements are defective.
2. Abnormal rotation
| Check point Checking method Possible defects
FG amplifier circuit Solder lead wire to terminal @3 of 1C201; remove Q203
it from the bottom plate and measure the waveform 1C201
in
the
state
of
rotation.
(See
Fig.
17)
FG
coil
pattern
breakage
20ms.
2.8V
a eT, A Vv
Voltage of 1C201 terminal (7) 5.1V
2 Control circuit
(Reference voltage circuit)
Lead wire
TS
Fig. 17
~~) Mie kc} 0 Fc |
3. Unstable rotation (Uneven rotation, repeat of normal and reverse rotations)
Control circuit Measure the waves at 1C201 terminals @) and @).
(Crystal oscillator) 2us.
Possible defects
2.6V
O6V 4 oy
Control circuit
(Brake, timer circuit)
(Stn 28 “on"’)
@) ——>5.9V
@) —4.2V
Control circuit
(Control output
circuit)
Instead of FG signal, apply FG signal by CR
oscillator, (Refer to “How to check the control
circuit.)
Measure the waves at 1C201 terminals @, @, ®.
Note:
Besides
the
above,
it
is
possible
that
Hall
elements
are
defective.
In
this
case,
the
symptom
may
be
that
the
turntable
reversely
rotates
because
the
turntable
position
cannot
be
detected.
4. Others
Check
point
Checking
method
Possible
defects
Strobe LED does not Q202 collector output waveform.
light
up.
10ms.
13V
33/45
r.p.m.
i
Voltage
at
1C201
terminals
©
and
@).
changeover
is
impossible.
®How to check the control circuit
Instruments used Setting
1. CR oscillator 1. Remove the turntable and panel cover.
2. Oscilloscope (Two channel type) (Refer to “Disassembly instructions”)
3. 50V 1uF electrolytic condenser 2. Remove the connector (CN2) from the arm switch.
3. Unsolder the positive @ side of C203.
[22]