To Next PageTo Next PageWhy is there no sound from my Yamaha YST-SW800?
If there is no sound coming from your Yamaha Subwoofer, there might be a couple of reasons. First, check that the VOLUME control isn't set to 0; if it is, simply turn the VOLUME control to the right. Second, ensure that the speaker cords are securely connected.
How to fix a Yamaha YST-SW800 Subwoofer that won't turn on?
If your Yamaha Subwoofer isn't powering on even when the STANDBY/ON button is in the ON position, the power cord might not be properly plugged into an AC outlet, or the POWER switch might be set to the OFF position. Make sure the power cord is plugged into a working AC outlet and that the POWER switch is set to the ON position.
Emphasizes following procedures to prevent injury and component damage.
Clarifies that manual sale does not grant authorization or imply capabilities.
Warns about static discharge destroying components and advises grounding.
Advises turning off the unit before disassembly and rechecking work.
Highlights components marked with A that require exact specification replacement.
Details procedures for verifying insulation and measuring leakage current.
Warns about lead in solder and other chemicals, advising against ingestion and skin contact.
Details steps to remove the front panel assembly using screws.
Explains how to remove the loud speaker by unscrewing the base assembly.
Outlines the process for removing the rear panel assembly with screws.
Provides instructions for properly installing the product emblem using a mallet.
Describes using epoxy to securely install the power switch.
Advises applying epoxy to the cord stopper for secure power cord installation.
Instructs to disconnect specific connectors to separate power supply and amplifier circuits.
Details checks for FETs and transistors, and a procedure to test amplifier operation.
Advises discharging capacitors before repair and outlines checks for transistors and resistors.
Guides on checking waveforms and adjusting VR201 for proper power supply operation.
Provides safety warnings regarding high voltage during operation checks.
Explains how to confirm correct waveform output from the repaired power amplifier.
Details how to adjust VR1 for stable amplifier operation under no-load conditions.
Guides on verifying the auto standby function by observing LED behavior.
Identifies specific test points on the Main (1) P.C.B. for measurements.
Presents detailed schematic diagrams for the main audio circuits.
Displays schematics for the power supply and protection circuits.
Provides detailed schematic diagrams for the power supply and related circuits.
Lists and explains abbreviations used in the electrical parts list.
Lists electrical components with part numbers and descriptions.
Lists resistors and other components for the Main and Power PCBs.
Lists components, transistors, and resistors for the Power PCB.
Lists emblems, spacers, insulators, screws, and pads.
Emphasizes following procedures to prevent injury and component damage.
Clarifies that manual sale does not grant authorization or imply capabilities.
Warns about static discharge destroying components and advises grounding.
Advises turning off the unit before disassembly and rechecking work.
Highlights components marked with A that require exact specification replacement.
Details procedures for verifying insulation and measuring leakage current.
Warns about lead in solder and other chemicals, advising against ingestion and skin contact.
Details steps to remove the front panel assembly using screws.
Explains how to remove the loud speaker by unscrewing the base assembly.
Outlines the process for removing the rear panel assembly with screws.
Provides instructions for properly installing the product emblem using a mallet.
Describes using epoxy to securely install the power switch.
Advises applying epoxy to the cord stopper for secure power cord installation.
Instructs to disconnect specific connectors to separate power supply and amplifier circuits.
Details checks for FETs and transistors, and a procedure to test amplifier operation.
Advises discharging capacitors before repair and outlines checks for transistors and resistors.
Guides on checking waveforms and adjusting VR201 for proper power supply operation.
Provides safety warnings regarding high voltage during operation checks.
Explains how to confirm correct waveform output from the repaired power amplifier.
Details how to adjust VR1 for stable amplifier operation under no-load conditions.
Guides on verifying the auto standby function by observing LED behavior.
Identifies specific test points on the Main (1) P.C.B. for measurements.
Presents detailed schematic diagrams for the main audio circuits.
Displays schematics for the power supply and protection circuits.
Provides detailed schematic diagrams for the power supply and related circuits.
Lists and explains abbreviations used in the electrical parts list.
Lists electrical components with part numbers and descriptions.
Lists resistors and other components for the Main and Power PCBs.
Lists components, transistors, and resistors for the Power PCB.
Lists emblems, spacers, insulators, screws, and pads.
The YST-SW800 is a subwoofer system designed by Yamaha, offering advanced active servo technology for enhanced bass performance. This service manual provides comprehensive information for authorized Yamaha retailers and service personnel regarding its maintenance, repair, and specifications.
The YST-SW800 functions as a dedicated subwoofer, designed to reproduce low-frequency audio signals, complementing a main speaker system. It incorporates Yamaha's Advanced Active Servo Technology, which is a negative-impedance converter system that dynamically compensates for the effects of speaker impedance, ensuring a more linear and powerful bass response. The front panel features controls for STANDBY/ON, HIGH CUT (adjustable from 40-140Hz), and VOLUME (0-10), allowing users to fine-tune the subwoofer's output to match their listening environment and main speakers. The rear panel includes various input and output terminals for connection to an amplifier and other speakers, as well as controls for BASS PHASE (REV/NORM) and AUTO STANDBY (HIGH/LOW/OFF).
Type: Advanced Yamaha Active Servo Technology Driver: 25 cm (9-13/16") cone woofer (JA25610), magnetically shielded type. Amplifier Output:
The manual also details specific components and their part numbers, including various capacitors, diodes, transistors (FET, TR), integrated circuits (IC), coils, resistors, and mechanical parts. Critical components are marked with a triangle symbol (▲) and must be replaced with parts having equivalent specifications.
The YST-SW800 offers several features for user convenience and sound customization:
The service manual outlines detailed procedures for maintenance and repair, emphasizing safety and precision.
General
