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General| Brand | Casio |
|---|---|
| Model | HT-3000 |
| Category | Electronic Keyboard |
| Language | English |
Detailed schematics for the primary M4240-MA1M and M4240-IF circuit boards.
Schematics for signal processing (M6149-MA3M) and control (CN2) boards.
Schematics for interface connectors (CN1, CN3-CN8) and keyboard matrix.
Physical layout and key test points for the M4240-MA1M circuit board.
Physical layout for the M4240-MA2M circuit board.
Analysis of key waveforms with specific test parameters and conditions.
High-level block diagram illustrating overall system architecture and signal flow.
Key input matrix details and pinout/functions for the µPD78C10 CPU.
Methods for CPU access to ROM, RAM, and external RAM cards.
Logic for selecting specific integrated circuits based on CPU signals.
Functionality of LED driving and analog signal paths in audio circuits.
Detailed pin functions and signal outputs for the Music LSI.
Generation and filtering circuits for melody, chord, and VCF signals.
VCF control voltage levels and the operation of mute circuits.
Generation, mixing, and waveforms for bass sounds.
Details on percussion sound generation and stereo chorus effect implementation.
Power supply management, including auto power-off features.
LCD connection diagram and VCF calibration steps for optimal performance.
Guide to identifying and resolving common operational faults and problems.
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