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Technics SL-Q303

Technics SL-Q303
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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
Question and Answer IconNeed help?

Do you have a question about the Technics SL-Q303 and is the answer not in the manual?

Technics SL-Q303 Specifications

General IconGeneral
Effective length230 mm
Overhang15 mm
PlatterAluminum
Speeds33 and 45rpm
Wow and flutter0.025% (WRMS)
Tonearm typeStatic Balance
TypeBelt-drive
Rumble-78dB

Summary

Specifications

General Specifications

Basic electrical and physical properties of the turntable system.

Turntable Section Specifications

Details of the turntable platter, motor, and drive system.

Tonearm Section Specifications

Specifications for the tonearm assembly, including length and tracking.

Cartridge Section Specifications

Details on the cartridge type, frequency response, and output.

Replacement Parts List

Location of Controls

Technical Explanation

Principles of Auto Size Detection

Explains the core system for automatic record size detection.

Mechanism Operation for Auto Size Detection

Details the mechanical workings of the auto size detection feature.

Disassembly Instructions

Remove Main Base and Cabinet

Step-by-step guide for disassembling the main unit housing.

Remove Drive Circuit PCB and Stator Frame

Instructions for removing internal circuit boards and the stator.

Remove Arm Base and Tonearm

Steps for detaching the tonearm assembly from the main base.

Remove Automatic Mechanism Plate

Guide for detaching the automatic mechanism plate.

Replace Electric Parts

Procedures for replacing electronic components within the unit.

Replacement of Hall Element

Measurements and Adjustments

Arm-lift Height Adjustment

How to set the correct tonearm lift height for stylus placement.

Automatic Start Position Adjustment

How to adjust the auto-start mechanism for proper record cueing.

Automatic Return Position Adjustment

How to adjust the auto-return mechanism for end-of-record cueing.

Overhang Adjustment

How to set the correct tonearm overhang for optimal tracking.

Cartridge Installation

About Cartridge Weight

Information on suitable cartridge weights for the tonearm.

Circuit Board and Wiring Connection Diagram

Schematic Diagram

IC Terminal Voltage and Waveform

Details voltage and waveform measurements for key IC components.

Block Diagram

Trouble Shooting Guide

Troubleshooting: No Rotation

Steps to diagnose and fix when the turntable does not spin.

Troubleshooting: Abnormal Rotation

Steps to diagnose and fix irregular or erratic turntable rotation.

Troubleshooting: Unstable Rotation

Steps to diagnose and fix unstable or repeating turntable rotation.

Troubleshooting: Others

Diagnostic steps for miscellaneous turntable issues.

Check Control Circuit

Procedure for verifying the functionality of the turntable's control circuit.

Replacement Parts List (Cabinet, Chassis, Packing)

Exploded Views: Main Base

Exploded Views: Automatic Mechanism Plate

Packings Information

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