Technics SLQ 303 Service Manual

Page 1

ORDER NO. SDB1OS1888C1

Service Manual

QUARTZ Turntable System

SL-Q303

Areas

- [M] is available in U.S.A.
' [MC] is available in Canada]

I General

Power supply:
Power consumption:
Dimensions:

(W x H x 0)

Weight:

I Turntable section

Type:

Drive method:
Motor:

Turntable platter

Turntable speeds:
Wow and flutter:

Specifications

Drive control method:

Specifications are subject to change without notice for further improvement.

Weight and dimensions shown are approximate.

120 V, AC, 50 Hz/60 Hz

7 W

43 x 10.6 x 37.5 cm

(16-15/16" x 4-7/32" x 14-3/4")
Maximam height when top (dust cover)
is open.

43 x 37 x 42 Cm

(16-15/16" x 14-9/16" x 16-17/32")
6.5 kg (14.3 lb.)

Quartz direct drive

Automatic turntable

Auto start

Auto return

Auto stop

Manual play

Repeat play

Direct drive

Brushless DC motor
Ouartz-phase-locked control
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 (lEC 98A Weighted)

'This rating refers to turntable assembly alone, excluding effects
of record. cartridge or tonearm, but including platter.
Measured by obtaining signal from builtein frequency generator

of motor assembly.
Rumble:

I Tonearm section

Type:

Effective length:
Overhang:

Tracking error angle:

Offset angle:
Friction:
Effective mass:
Stylus presure

adjustment range:

Applicable cartridge
weight range:

Headshell weight:

Phono cable
capacitance:

-56 dB (IEC 98A Unweighted)
-78 dB (IEC 98A Weighted)

Universal tonearm

"S" shaped tubular arm

Static balanced type

230 mm (9-1/16")

15 mm (19/32")

Within 2032' at the outer groove of
30 cm (12") record

Within 0032 at the inner groove of
30 cm (12") record

22°

Less than 7 mg (lateral, vertical)

11 9 (without cartridge)

0-2.59

(See page 10)
7.59

135pF

Downloaded from www.vinylengine.com

Technics

Panasonic Company
Division of Matauahlta Electric
Corporation of America

One Panasonic Way. Secaucus.

New Jersey 07094

Panasonic Hawaii. Inc.

320 Waiakamilo Road. Honolulu.

Hawaii 96817

Panaeonlc Canada
Dlvlalon of Mateuahlta Electric
of Canada Limited

5770 Ambler Drive. Mississauga.

Ontario. uw 213

Panaaonlc Salea Company.
Dlvlalon of Mateuahlta Electric
of Puerto Rico. Inc.

Ave, 65 De lnfanteria, KM 9.7
Victoria Industrial Park
Carolina. Puerto Rico 00630

Page 2

I CONTENTS

Page Page

LOCATION OF CONTROLS .................... 2, 3 SCHEMATIC DIAGRAM .................... 13 ~15

TECHNICAL EXPLANATION ................... 4, 5 BLOCK DIAGRAM ........................... 16

DISASSEMBLY INSTRUCTIONS ................ 6 ~ 8 TROUBLE SHOOTHING GUIDE ............... 17 ~ 19

REPLACEMENT OF HALL ELEMENT ................ 8 REPLACEMENT PARTS LIST (Electrical Parts) ........ 19, 20

MEASUREMENTS AND ADJUSTMENTS ............ 9, 10 REPLACEMENT PARTS LIST

CARTRIDGE INSTALLATION ................... 10 (Cabinet, Chassis and Packing Parts) ............. 20, 25

ABOUT CARTRIDGE WEIGHT ................... 10 EXPLODED VIEWS ....................... 21 ~ 25

CIRCUIT BOARD AND WIRING PACKINGS ............................... 26

CONNECTION DIAGRAM .................. 11, 12
I LOCATION OF CONTROLS

Hinge Counterweight
Weight ring

Headshell stand

Turntable base Antiskating control

Turntable mat

Arm rest
Record size sensor
Arm clamp
Center 5 indle
p Tonearm

Turntable platter Locking sleeve

Headshell

Strobe-illuminatorl
pilot lamp

Start/stop switch

m
L-Power switch (off I , on - )

Cueing control

Speed selectors

Repeat switch (off I , on -)

Page 7

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".)

. Remove the drive circuit P.C.B. setscrews ® ~ 0 .

(See Fig. 5)

. Remove the stator frame setscrews fl ~ 0 .

Remove the regulator transistor (03) setscrew 0 and
connector @ . Then, the drive circuit P.C.B. can be
separated from the stator frame. (See Fig. 5)

. When removing the drive circuit P.C.B. and stator frame
together, remove the connector @ and setscrews ®~

Q . (See Fig. 5)

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")

. Remove the arm base setscrews @~ 6. Then, the arm
base can be removed. (See Fig. 6)

. When removing the tonearm, turn over the arm base and
remove the PU fixing plate setscrew o and canceller
spring. (See Fig. 7)

. Remove the phono output P.C.B. setscrew 6 and un-
solder the 5 lead wires from the tonearm. (See Fig. 7)

PU fixing plate-

Canceller '
spring

\

Cueing lever

Tonearm

Fig. 7

< Drive circuit P.C.B.

Automatic
Regulator mechanism plate

transistor (03)

Fig. 5

Anti-skating
control knob

Arm base

Arm lift
Fig. 6

Remove the tonearm setscrews Q and Q .

Then, the tonearm can be removed in the direction of

the arrow. (See Fig. 7)

When removing this lift base plate, remove the arm lift

setscrew 0 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.

Remove the anti-skating control knob. (See Fig. 6)

Turn over the arm base and remove the PU fixing plate.

Remove the lift base plate setscrews @ and Q. Then,

the lift base plate can be removed.

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)

7.
8.
9.

10.

7