Technics SB-G910 - User Manual

ORDER NO. $D83052502C7 __ :
ervice Manual
Hi-Fi Speaker System
SB-G910 (mM)
[PA], [PC], [XA].
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Areas
*{PA] is available in Far East PX.
*[PC] is available in European Audio Club.
* [XA] is available in Southeast Asia, Oceania, Africa,
Middle Near East and Central South America.
Specifications (Specifications are subject to change without notice for further improvement.)
Weight and dimensions shown are approximate.
Type: 4 way 5 speaker bass-reflex Output Sound
: system Pressure Level: 99 dB/W (1.0 m)
Speakers: Woofer: 41 cm, cone type Crossover Frequency: 350 Hz, 3,500 Hz, 10,000 Hz
Midrange: 18 cm, cone type Frequency Range: 35 Hz ~ 30 kHz (—20 dB)
Tweeter: horn type Dimensions: 46.4(W) x 72.0(H) x 30.9(D) cm
Super Tweeter: horn type x 2 Weight: 17.5 kg
Impedance: 8 ohms
Input Power: 300 W, Music
ESPECIFICACIONES CARACTERISTIQUES
(Las. especificaciones quedan sujetas a cambios sin aviso (Sujet a changement sans préaris.) f |
previo. El peso y las dimensiones indicados son aproximados.)
Type: 4 voies, 5 haut-parleurs, se
Tipo: Sistema de reflexién de bajos bass-reflex , |
con 5 altoparlantes de 4 vias Haut-parleurs: graves: 41 cm, type a cone :
Altoparlantes: “Woofer’’: tipo cénico, de 41.cm_ | . moyennes: 18 cm type a coéne
“Gama media”’: tipo cénico, aigus: type a corne
de 18 cm “Super haut-parleur” aigu:
“Tweeter”: tipo bocina. | type a corne x 2
“Super tweeter’: tipo bocina x 2 Impédance: 8 ohms
Impedancia: 8 ohmios Entrée maximale: 300 watts, musique
Capacidad de potencia: 300 W, musica | Niveau de pression | ,
Nivel de presién sonore de sortie: 99 dB/W (1,0 m)
acustica de salida: 99 dB/W (1,0 m) Fréquence de commutation: 350 Hz, 3.500 Hz, 10.000 Hz we
Frecuencia de cruce: 350 Hz, 3.500 Hz, 10.000 Hz Gamme de fréquences: = = 35 Hz ~ 30 kHz (—20 dB) [Xx
Alcance de frecuencia: 35 Hz ~ 30 kHz (—20 dB) Dimensions: 46,4(L) x 72,0(H) x 30,9(P) cm 4 AN
Dimensiones: 46,4(ancho) x 72,O(alto) x Poids: 17,5 kg | | oe.
30,9(prof.) cm | | pie
‘Peso: ; 17,5 kg
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Panasonic
Tokyo
Matsushita
Electric
Trading
Co.,
Ltd.
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Matsushita
Electric
Industrial
Co.,
Ltd.
P.O.
Box
288,
Central
Osaka
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|
~
1-2,
1-chome,
Shibakoen,
Minato-ku,
Tokyo 105 Japan

Summary

Specifications

Type

Describes the speaker system's configuration and acoustic principle.

Speakers

Details the individual speaker drivers and their specifications.

Impedance

Specifies the electrical impedance of the speaker system.

Input Power

Indicates the power handling capability of the speaker system.

Output Sound Pressure Level

Measures the speaker's sensitivity and sound output level.

Crossover Frequency

Defines the frequencies at which audio signals are divided among drivers.

Frequency Range

Specifies the operational frequency response of the speaker system.

Dimensions

Provides the physical size of the speaker system.

Weight

Indicates the physical weight of the speaker system.

Servicing Method

How to remove the attenuator switch

Step-by-step guide for removing the attenuator switch assembly.

How to remove the LED output level

Instructions for detaching the LED assembly from the PCB.

Connection of speaker unit and direction of the terminals

Details speaker unit connections and terminal orientation.

Replacement Parts List

Speakers

Identifies specific speaker driver part numbers for replacement.

Coils

Lists part numbers for the inductor coils used in the crossover.

Capacitors

Lists part numbers for the capacitors used in the crossover.

Resistors

Lists part numbers for the resistors used in the circuit.

Diodes

Lists part numbers for the diodes used in the circuit.

Switch

Lists part numbers for the level selector switches.

Breaker

Lists part number for the thermal relay.

Cabinet Parts

Lists part numbers for external and internal cabinet components.

Screws

Lists part numbers for the screws used in assembly.

Packing

Accessories

Lists included accessories such as instruction manuals and cords.

Packing Parts

Details components used for packaging and shipping the product.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

This document is a service manual for the Technics Hi-Fi Speaker System SB-G910, available in different regional versions: [PA] for Far East PX, [PC] for European Audio Club, and [XA] for Southeast Asia, Oceania, Africa, Middle Near East, and Central South America. It provides detailed specifications, a schematic diagram, an exploded view, a replacement parts list, and servicing methods for the speaker system.

Function Description

The Technics SB-G910 is a 4-way, 5-speaker bass-reflex Hi-Fi speaker system designed to deliver high-fidelity audio. It incorporates multiple speaker drivers to cover a broad frequency range, ensuring a rich and detailed sound reproduction. The system includes a woofer for low frequencies, a midrange driver for mid-range sounds, a tweeter for high frequencies, and two super tweeters for ultra-high frequencies. This multi-driver configuration allows for a more accurate and dynamic sound output, suitable for a wide range of audio content. The speaker system is designed for home audio setups, providing a powerful and immersive listening experience.

Important Technical Specifications

The SB-G910 speaker system boasts impressive technical specifications:

• Type: 4-way, 5-speaker bass-reflex system. This design utilizes a port or vent in the cabinet to enhance bass response, making the low frequencies more pronounced and extended.
• Speakers:
  • Woofer: 41 cm, cone type. The large size of the woofer is crucial for producing deep and powerful bass.
  • Midrange: 18 cm, cone type. This driver handles the critical mid-range frequencies, where most vocals and instruments reside, ensuring clarity and presence.
  • Tweeter: Horn type. Horn tweeters are known for their efficiency and ability to project high frequencies with precision and wide dispersion.
  • Super Tweeter: Horn type x 2. The inclusion of two super tweeters extends the high-frequency response even further, capturing subtle details and harmonics for a more airy and spacious sound.
• Impedance: 8 ohms. This is a common impedance for home audio speakers, making them compatible with a wide range of amplifiers and receivers.
• Input Power: 300 W, Music. This indicates the maximum power the speaker can handle for musical content, suggesting it can be driven by powerful amplifiers to achieve high volume levels without distortion.
• Output Sound Pressure Level: 99 dB/W (1.0 m). This high sensitivity rating means the speaker can produce a loud sound level with relatively little amplifier power, making it efficient.
• Crossover Frequency: 350 Hz, 3,500 Hz, 10,000 Hz. These are the points at which the audio signal is divided and sent to the appropriate speaker drivers. The multiple crossover points ensure each driver operates within its optimal frequency range.
• Frequency Range: 35 Hz ~ 30 kHz (-20 dB). This wide frequency response covers nearly the entire audible spectrum, from deep bass to very high treble, providing a full and detailed sound.
• Dimensions: 46.4 (W) x 72.0 (H) x 30.9 (D) cm. These dimensions indicate a substantial speaker size, typical for a multi-driver, high-performance system, suggesting a significant cabinet volume for optimal acoustic performance.
• Weight: 17.5 kg. The considerable weight further emphasizes the robust construction and quality components used in the speaker.

Usage Features

The SB-G910 is designed for ease of use within a home audio system. Its 8-ohm impedance ensures broad compatibility with most stereo amplifiers and receivers. The high input power capacity allows users to connect it to powerful amplifiers for a dynamic listening experience, whether for music, movies, or gaming. The speaker system's multi-driver design and wide frequency response are optimized for reproducing a variety of audio content with high fidelity.

A notable usage feature is the Level Selector Switch (S1-1, S1-2, S1-3), which allows users to adjust the high-frequency output. This switch provides options for:

• High level -3dB (S1-1)
• High level -6dB (S1-2)
• MAX (S1-3)

This feature enables users to fine-tune the treble response according to their personal preference or the acoustic characteristics of their listening environment, providing flexibility in sound customization. The speaker also includes an LED output level indicator to visually represent the audio signal strength, which can be helpful for monitoring playback.

Maintenance Features

The service manual provides detailed instructions for maintenance and repair, focusing on common components that might require attention:

• Attenuator Switch Removal: The manual outlines a step-by-step process for removing the attenuator switch. This involves carefully detaching the front ornament plate (which is affixed with double-sided adhesive tape), unscrewing the ornament frame, removing the switch holder, and then detaching the knob using strong adhesive tape. Finally, the switch can be desoldered from the PCB. This detailed procedure ensures that technicians can access and replace the attenuator switch if it becomes faulty.
• LED Output Level Removal: Similar to the attenuator switch, the manual describes how to remove the LED assembly. This involves removing the ornament plate, taking out the LED assembly and attenuator PCB from the cabinet, and then desoldering the LED and breaker terminals from the PCB. This allows for easy replacement of the LED indicators if they fail.
• Component Replacement: The "Replacement Parts List" is a crucial maintenance feature, providing part numbers and descriptions for all major components, including speakers (woofer, midrange, tweeter, super tweeter), coils, capacitors, resistors, diodes, switches, and the thermal relay breaker. This comprehensive list simplifies the process of ordering and replacing specific parts, ensuring the longevity and repairability of the speaker system.
• Schematic Diagram and Exploded View: The inclusion of a schematic diagram and an exploded view aids in troubleshooting and assembly. The schematic diagram helps technicians understand the electrical connections and signal paths, while the exploded view provides a visual guide for disassembling and reassembling the speaker cabinet and its internal components. These diagrams are invaluable for identifying faulty parts and performing accurate repairs.
• Non-Polar Capacitors: The schematic diagram indicates the use of non-polar capacitors, which are important for audio signal paths as they do not have a specific positive or negative orientation, preventing distortion. This detail is relevant for maintenance, ensuring correct replacement if needed.
• Thermal Relay Breaker: The system includes a thermal relay breaker (B1: SSBS16AB02-1, Thermal Relay 1.6A), which acts as a safety feature to protect the speakers from overcurrents, preventing damage due to excessive power input. This component is also listed for replacement, highlighting its role in the system's protection.

Overall, the Technics SB-G910 is a robust and high-performance speaker system designed for audiophiles, with comprehensive documentation provided for its maintenance and repair, ensuring its long-term usability.

Technics SB-G910 Specifications