KYE Systems Corp. Genius SP-S120

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document is a service guide for the KYE SYSTEMS CORP. SP-S120 speaker system. It provides detailed information for handling defective returns, specifications, block diagrams, exploded views, part lists, schematic diagrams, and important notes for maintenance and repair.

Function Description

The SP-S120 is a speaker system designed to amplify audio signals. It includes a host unit and satellite speakers. The system takes an audio input, processes it through a power amplifier, and outputs sound through left and right channel speakers. It features volume control (increase and decrease) and is powered via an AC input, which goes through a power conditioner.

Important Technical Specifications

The SP-S120 speaker system has the following key specifications:

Out Power at THD 10%: ≥ 1 W
Sensitivity: 400 ± 50 mV
Frequency Response (Ref:-3dB): 40Hz ~ 20KHz
Separation: ≥ 40 dB
S/N ratio: ≥ 60 dB
Hum & Noise (Vol.: max): ≤ 10 mV

The system utilizes a TEA2025L IC for amplification. It supports various power configurations, including 120V, 230V, and 240V, with corresponding transformers (9VAC & 0.3A). The speaker units are 4 ohm, 3W models (5090).

Usage Features

The SP-S120 is a straightforward speaker system with basic audio input and volume control. Users can connect an audio source to the "AUDIO IN" port and adjust the output volume using the integrated controls. The system includes a power LED indicator to show its operational status.

Maintenance Features

The service guide provides comprehensive information for troubleshooting and repairing the SP-S120 speaker system.

Troubleshooting Flowcharts: The guide includes flowcharts for common problems:

One or more channels no sound:
- Problem Analysis: Check for broken or short circuits, defective ICs, or disconnected/damaged speaker cables.
- Solutions: Re-solder points on the PCB, check and replace defective ICs, or re-connect/replace speaker cables/speakers.
Power LED (indicator) no light:
- Problem Analysis: Check for defective power switch or LED, defective diode (SW, R15, C14, C15), or disconnected/defective AC cord of the transformer.
- Solutions: Re-solder or replace defective components.
Volume no function:
- Problem Analysis: Check for broken or short circuits, or defective VR1 (volume resistor) or IC.
- Solutions: Check solder points on the PCB, or check and replace defective components.

Exploded Views and Part List: The guide includes detailed exploded views for both the host and satellite units, along with a comprehensive part list. This allows technicians to identify and order specific components for repair. Key parts include:

Speaker body variants for different regions (120V-US, 230V-EU, 240V-AU, 240V-UK)
Loud Speaker 5090 4 ohm 3W
Rubber Pad, SP-S200
PCBA, SP-S120
IC, TEA2025L
Transformers for various voltages (120V, 230V, 240V)
S/N Label, Gift Box, and Carton for packaging.

Schematic Diagram: A schematic diagram is provided, detailing the electronic circuitry of the SP-S120, including the power input, amplifier section (featuring the TEA2025L IC), volume control, and speaker outputs. This is crucial for in-depth electrical troubleshooting and component-level repair.

Important Notes for Maintenance:

Packing Requirement for Sending the PCB Assembly by Post: Emphasizes the need for proper packing, especially using separate static-protecting bags for PCB assemblies with sophisticated IC components, to prevent static electricity damage. Reliable external packing is also crucial to avoid loss or damage during transit.
Short of Spare Parts while Repairing a Speaker System: Recommends cannibalizing parts from one speaker system if there's a shortage of spare parts, to ensure that as many speaker systems as possible can be repaired.

Safety Precautions: The guide outlines several safety precautions to be observed during handling and maintenance:

Place speakers on a flat, level, and stable surface.
Avoid environments with mist, smoke, vibration, excessive dust, salty/greasy air, or corrosive gases/fumes.
Do not drop or jolt the speakers.
Prevent objects from falling into the subwoofer case through its ventilator to avoid electric shock or fire.
Ensure sufficient distance from other equipment for good heat dissipation.
Disconnect the AC power cord before any maintenance.
Do not perform maintenance with wet hands.
Prevent foreign substances (water, liquids, chemicals) from entering the speakers during maintenance.