Technics SB-LS10 - User Manual

ORDER NO. AD9409248C2
Service
Manual
3-Way
Speaker
System
Speaker
System
“pe SB-LS10
Colour
(K) ... Black Type
Suffix for
Mode! No.
(E)
System: SC-LS10
Cassette CD erdaieis
receiver pe
SC-LS10 SA-LS10 SB-LS10
Remote Control
Transmitter
Because
of
unique
interconnecting
cables,
when
a
component
requires
service,
send
or
bring
in
the
entire system.
Mi
SPECIFICATIONS
Mi
SCHEMATIC
DIAGRAM
Type
3
way
speaker
system
(This
schematic
diagram
may
be
modified
at
any
Speaker(s)
time
with
the
development
of
new
technology.)
Woofer
16
cm
active
air
coupling
woofer
(
16
cm
passive
eer)
12
cm
cone
type
driver
unit
Main
unit
6.5
cm
cone
type
TWEETER
Tweeter
Dome
type
=
™
(Dome)
Impedance
4Q
YEL
Input
power
60
W
(music)/30
W
(DIN)
Output
sound
pressure
79
db/W
(1.0
m)
SAIN
ae
Cross
over
frequency
250
Hz,
5
kHz
(6.5cm
Cone)
Frequency
range
38
Hz—30
kHz
(—
16
dB)
Ses
3
Wi
General
INPUT(4Q)
Dimensions
(W
<
H
x
D)
200
x
314x170
mm
Weight
3.2
kg
f__
ti
SP4
Notes:
PASSIVE
1.
Specifications
are
subject
to
change
without
notice.
Gen
2.
Weight
and
dimensions
are
approximate.
NOTES:
Refer
to
the
service
manual
for
Model
No.
SA-LS10
(Order
No.
AD9409247C2)
for
information
on
“CONNECTIONS”.
A WARNING
This
service
information
is
designed
for
experienced
repair
technicians
only
and
is
not
designed
for
use
by
the
general
public.
It
does
not
contain
warnings
or
cautions
to
advise
non-technical
individuals
of
potential
dangers
in
attempting
to
service
a
product.
Products
powered
by
electricity
should
be
serviced
or
repaired
only
by
experienced
professional
technicians.
Any
attempt
to
service
or
repair
the
product
or
products
dealt
with
in
this
service
information
by
anyone
else
could
result
in
serious
injury
or
death.
© 1994 Matsushita Electric Industrial Co., Ltd.
M4 ® All rights reserved. Unauthorized copying and
ec i ) 1CS distribution is a violation of law.

Summary

Speaker System Specifications

Speaker System Schematic Diagram

Disassembly Instructions

Speaker Net Unit Disassembly

Procedure for removing and replacing the speaker net unit, involving opening the upper section.

Front Panel Assembly Disassembly

Steps to remove the front panel assembly, requiring removal of 10 screws.

Passive Radiator Disassembly

Instructions for removing the passive radiator, noting correct orientation.

Speaker Woofer Disassembly

Procedure for removing the speaker woofer, including back cavity removal.

Speaker (Main Unit and Tweeter) Disassembly

Steps to remove the main unit and tweeter speakers, including shut packing.

P.C.B. Replacement

Procedure for replacing the Printed Circuit Board (P.C.B.) component.

Terminal Plate Replacement

Instructions for removing and replacing the terminal plate.

Replacement Parts List

Cabinet Parts Location and Packaging

Overview

1. Technics SB-LS10 Speaker System
   1. Function Description
   2. Important Technical Specifications
   3. Usage Features
   4. Maintenance Features

Technics SB-LS10 Speaker System

The Technics SB-LS10 is a 3-way speaker system designed to deliver a rich and detailed audio experience, forming part of the SC-LS10 compact stereo system. This manual provides comprehensive information for both users and service technicians, covering its specifications, assembly, and maintenance procedures. The system is characterized by its sleek black finish, denoted by the "(K)" in its model number, and is primarily intended for the European market.

Function Description

The SB-LS10 speaker system is engineered to reproduce a full range of audio frequencies, from deep bass to crisp highs, through its multi-driver configuration. As a 3-way system, it employs dedicated drivers for different frequency bands, ensuring optimal sound reproduction and clarity. It is designed to be paired with the SA-LS10 cassette CD receiver, forming a complete and integrated audio setup. The unique interconnecting cables between the components emphasize the system's integrated design, and for service, it is recommended to send or bring in the entire system to ensure proper diagnosis and repair.

Important Technical Specifications

The SB-LS10 boasts a robust set of specifications that highlight its audio performance capabilities:

Speaker Type: 3-way speaker system

Driver Configuration:

• Woofer: Features a 16 cm active air coupling woofer and a 16 cm passive radiator, complemented by a 12 cm cone type driver unit. This combination is designed to produce powerful and extended bass frequencies.
• Main Unit: Utilizes a 6.5 cm cone type driver, responsible for handling the mid-range frequencies, crucial for vocal clarity and instrument reproduction.
• Tweeter: Equipped with a dome type tweeter, which accurately reproduces high-frequency sounds, adding detail and sparkle to the audio.

Electrical Specifications:

• Impedance: 4 Ω, indicating its compatibility with amplifiers designed for this load.
• Input Power: Rated at 60 W (music) and 30 W (DIN), signifying its ability to handle a decent amount of power for home audio environments.
• Output Sound Pressure: 79 dB/W (1.0 m), which is a measure of its efficiency, indicating how loud the speaker can get with a given amount of power.
• Crossover Frequency: The system employs crossover points at 250 Hz and 5 kHz. These frequencies define where the audio signal is split and directed to the appropriate drivers (woofer, main unit, and tweeter), ensuring each driver operates within its optimal frequency range and minimizing distortion.
• Frequency Range: 38 Hz – 30 kHz (-16 dB), demonstrating its wide frequency response, capable of reproducing very low bass notes and extended high frequencies beyond the typical human hearing range.

General Specifications:

• Dimensions (W×H×D): 200 × 314 × 170 mm, making it a relatively compact speaker suitable for various room setups.
• Weight: 3.2 kg, indicating a solid build quality for its size.

The schematic diagram provides further insight into the internal wiring and components, including coils (L1, L2), capacitors (C1, C2, C3), and a resistor (R1), which form the crossover network. For instance, L1 is a 0.33mH coil, L2 is a 1mH coil, C1 is a 50V 1.8uF capacitor, C2 is a 50V 68uF capacitor, and C3 is a 50V 3.3uF capacitor. R1 is a 3W 10Ω resistor. These components are critical for directing specific frequency bands to the correct drivers (SP1 Tweeter, SP2 Main Unit, SP3 Driver Unit, and SP4 Passive Radiator). The diagram also highlights the non-polar electrolytic capacitors used in the design.

Usage Features

The SB-LS10 is designed for straightforward integration into a home audio system, specifically with the Technics SC-LS10. Its compact dimensions allow for flexible placement on shelves, desks, or speaker stands. The system's 3-way design ensures a balanced sound profile, suitable for various music genres and general entertainment. The inclusion of a passive radiator, alongside an active woofer, enhances bass response without requiring additional power, contributing to a fuller sound from a relatively small enclosure.

Maintenance Features

The service manual provides detailed disassembly instructions for various components, facilitating maintenance and repair. Key maintenance features include:

Speaker Net Unit Replacement:

• The speaker net unit can be easily removed by holding the bottom and opening the upper part, allowing access to the drivers for cleaning or replacement.

Front Panel Assembly Replacement:

• Removing 10 screws allows for the removal of the front panel assembly, providing access to the main unit and tweeter drivers.

Passive Radiator Replacement:

• The passive radiator can be replaced by removing 2 screws. It's crucial to ensure the "UP" marking on the passive radiator is correctly oriented during reassembly to maintain optimal performance.

Speaker (Woofer) Replacement:

• Replacing the woofer involves removing 4 screws and the back cavity. Similar to the passive radiator, the "UP" marking on the back cavity must be correctly positioned. After removing the back cavity, the 4 speaker terminals need to be pulled out to fully detach the woofer.

Main Unit and Tweeter Replacement:

• Replacing these drivers requires removing 8 screws and pulling out the speaker terminals. Special attention is given to ensuring the shut packing is firmly seated to prevent air leaks, which could compromise sound quality.

P.C.B. (Printed Circuit Board) Replacement:

• The P.C.B., which houses the crossover network, can be accessed and replaced by following a specific screw removal sequence.

Terminal Plate Replacement:

• The terminal plate, where the speaker cables connect, can be replaced by removing 2 screws.

Replacement Parts List:

• The manual includes a comprehensive list of replacement parts, such as speakers (tweeter, main unit, driver unit, passive radiator), coils, resistors, and capacitors, along with their part numbers. This is invaluable for technicians to order the correct components for repair.
• It also lists cabinet and chassis parts, including the speaker net unit, terminal plate, front panel assembly, back cavity, shut packing, rubber feet, and rear cabinet assembly.
• Packing materials like the packing case, cushions, and protection sheet are also specified.

Important Notes for Service:

• The manual explicitly states that capacity values are in microfarads (uF) unless specified otherwise, with P denoting pico-farads (pF) and F denoting farads (F).
• Resistance values are in ohms, with 1 K = 1,000 (OHM) and 1 M = 1,000k (OHM).
• A warning is included, emphasizing that the service information is for experienced repair technicians only, as servicing products powered by electricity can be dangerous. Unauthorized copying and distribution of the manual are prohibited.

The Technics SB-LS10 speaker system, with its detailed specifications and comprehensive service instructions, is designed for both reliable performance and ease of maintenance, ensuring a long lifespan for this component of the SC-LS10 audio system.

Technics SB-LS10 Specifications