This document is a service guide for the SP-S110 speaker system, produced by KEY SYSTEM CORP. It provides comprehensive information for handling defective returns, technical specifications, exploded views, part lists, important notes, and a schematic diagram.
Function Description
The SP-S110 is a speaker system designed for audio output. It comprises an active speaker and a passive speaker. The active speaker houses the main circuitry, including the power supply, amplifier, and controls for volume and headphone output. The passive speaker connects to the active speaker to provide stereo audio. The system is designed to deliver sound from various audio sources, likely through a standard audio input jack.
Important Technical Specifications
The service guide includes a detailed specification table for the SP-S110:
- Rated Output Power: 0.45 W @ TDH 10% (Total Harmonic Distortion) with a limit of ±5%.
- Sensitivity (1KHz) @ Rated O/P Power: 380 mV, with a limit of ±20mV.
- Max Input Level @ 1% TDH: 140 mV, with a limit of ±20.
- Frequency Response (1KHz -3dB):
- LOW: 60 Hz
- HIGH: 57 KHz
- Limits: ±5 for both.
- S/N @ Rated O/P Power: 57 dB, with a limit of ≥55.
- Channel Unbalance @ REF O/P Power: 0.2 dB, with a limit of ≤0.5.
- Channel Separation (One Channel Input, Other Channel Shorting): 45 dB, with a limit of ≥40.
- Hum Noise @ Vol Max (Volume Max, Input Shorting): 1.5 mV, with a limit of ≤2.
- Hum Noise @ Vol Max (Volume Min, Input Shorting): 0.5 mV, with a limit of ≤1.
These specifications indicate that the SP-S110 is a low-power speaker system, likely intended for personal computer or small audio device use, offering a decent frequency response and signal-to-noise ratio for its class.
Usage Features
The SP-S110 features a volume control (VR1) and a headphone jack (PS1 JACK) located on the active speaker. An LED indicator (LED1) provides visual feedback, likely for power status. The system is designed for ease of use with standard audio input.
Maintenance Features
The service guide provides a comprehensive framework for troubleshooting and repairing the SP-S110, primarily aimed at service technicians.
Troubleshooting Flowcharts:
The document includes detailed flowcharts for common problems:
- No power, LED (indicator) unlighted: This flowchart guides the technician to check for dry-soldered secondary wire of the transformer, defective or damaged D1-D1 diode, or a poor/defective power switch connection. Solutions involve repair, replacement, or resoldering.
- No sound: This section directs checks for damaged, dry-soldered, or short-circuited PCBs, abnormal or damaged power supply for IC TDA2822, or a damaged VR1 (volume control). Solutions include repair, replacement, or resoldering.
- Noise: Troubleshooting for noise involves checking the filter capacitor (for not working, dry-soldered, or damaged diode), abnormal power supply for IC TDA2822, broken or dry-soldered PCB, vibration from too long lead wire of driver units, damaged/short-circuited driver units, or poor VR connection. Solutions include repair, check, and replacement.
- LED indicators no light when working: This section focuses on a damaged LED1, broken PCB copper foil, or defective/dry-soldered LED1/R7. The solution is to check and replace.
- Volume switch no use: This problem points to a dry-soldered or broken PCB, or a defective VR1. The solution is to check and replace.
- Headphone jack no use: This indicates a poor connection in the PS1 JACK, with the solution being to check and replace.
Exploded Views and Part Lists:
The guide provides exploded views for both the active and passive speakers, detailing the components and their assembly. Corresponding part lists include reference numbers, descriptions, and part numbers for each component, facilitating easy identification and ordering of replacement parts.
Important Notes for Service:
- Packing Requirement: Emphasizes the importance of proper packing for PCB assemblies sent by post. It recommends using separate static-protecting bags for each PCB to prevent electrostatic discharge damage to sophisticated IC components and ensuring reliable external packing to avoid loss or damage during transit.
- Shortage of Spare Parts: Suggests a practical approach for managing spare parts shortages: if multiple speaker systems are awaiting repair, technicians can take necessary parts from one system to repair others, maximizing the number of functional units.
The service guide is a critical resource for maintaining and repairing the SP-S110 speaker system, providing structured troubleshooting, detailed component information, and practical advice for service personnel.
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