Yamaha LU90 / LX113T / M21 Silent Piano Service Manual

Description

This official repair reference for the Yamaha Silent Piano LU90 / LX113T / M21 provides model-specific service data for internal access, diagnosis, electronic checks and long-term technical reference.

Manual Specifications

• Brand: Yamaha
• Model: Silent Piano LU90 / LX113T / M21
• Product Type: Silent Piano
• Format: PDF
• Pages: 56

Instant Download

The complete original service documentation is supplied digitally in PDF format, allowing immediate access after purchase and convenient storage as a workshop or future troubleshooting reference.

Manual Contents

• Specifications: factory specifications.
• Control Switch Box & Pedal: control box and pedal service information.
• Unit Layout: internal system-unit locations.
• Disassembly Procedure: service disassembly sequence.
• LSI Pin Description: LSI pin functions.
• IC Block Diagram: functional IC reference.
• Circuit Boards: board-level technical information.
• Reloading the Program: service-program reload procedure.
• MIDI Implementation Chart: MIDI implementation reference.
• Main Maintenance Part: key maintenance information.
• Piano Maintenance Chart: manufacturer maintenance reference.
• Parts List: replacement-part identification.
• Block Diagram: system block relationships.
• Wiring Between Models: wiring and model interconnection information.
• Overall Circuit Diagram: complete circuit diagram.

Common Problems Covered

The Silent Piano LU90 / LX113T / M21 can require diagnosis across the power, keyboard, audio, control and pedal systems. Using the original service information makes it possible to trace these faults against Yamaha’s own board layouts, service checks and circuit references instead of relying on generic repair assumptions.

Technician Reference

Technicians can keep this document beside the Silent Piano LU90 / LX113T / M21 while opening the instrument, checking internal connections, running available service tests and following circuit paths. The terminology and component references correspond directly with Yamaha’s original design.

Who Is This Manual For?

This documentation is useful both in a professional workshop and for an experienced owner who wants to analyze the Silent Piano LU90 / LX113T / M21 as Yamaha intended. Beyond the immediate repair, it provides a permanent technical record of the piano’s internal service information.

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