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General| Synthesis Type | Sample-based Subtractive |
|---|---|
| Polyphony | 24 voices |
| Oscillators | 4 per voice |
| Keyboard | 61 keys with velocity and aftertouch |
| LFO | 2 LFOs per voice |
| MIDI | In, Out, Thru |
| Release Year | 1991 |
| Type | Digital Synthesizer |
| Waveforms | PCM samples |
| Effects | Chorus, Delay, Reverb |
| Timbrality | 4-part |
| Memory | 64 patches |
| Outputs | Stereo, Headphones |
Keyboard specifications including key count and type.
Details on the maximum number of simultaneous notes.
Physical size of the synthesizer unit.
The total mass of the instrument.
MIDI implementation details.
Procedure for attaching the contact board.
Process for installing the Aftertouch CIC component.
Method for mounting the contact rubber sheet.
How to check the current software version.
Process to reset the synth to its original settings.
Instructions for backing up and loading data.
Procedures for calibrating internal settings.
General overview of the JD-800 system architecture.
Explanation of the power supply system.
Description of components connected to the CPU.
Details on RAM and ROM memory usage.
Diagram of the Switch A board.
Diagram of the Switch C board.
Diagram of the LED board.
Diagram of the Switch B board.
Diagram of the Bender board.
Diagram of the Card board.
Diagram of the main power supply board.
Diagram of the jumper board.
Diagram of the primary board.
Schematic of the power supply circuitry.
Procedure to test the internal Random Access Memory.
Procedure to test the data card interface and functionality.
Procedure to test the internal Pulse Code Modulation Read-Only Memory.
Procedure to test the waveform card.
Procedure to test all panel buttons.
Procedure to test the status LEDs.
Procedure to test slider controls.
Procedure to test rotary encoder functionality.
Procedure to test bender and aftertouch inputs.
Procedure to test pedal inputs.
Procedure to test keyboard input and velocity.
Procedure to test MIDI input and output signals.
Procedure to test audio output signals.
Procedure to test the internal effects processor.
Procedure for adjusting the Digital-to-Analog converter.
Instructions on how to leave the test mode.
Troubleshooting steps for no power or intermittent power.
Steps to resolve issues related to system resets.
Troubleshooting for battery related errors.
Troubleshooting for issues with data or waveform cards.
Troubleshooting steps for non-functional LEDs.
Troubleshooting steps for slider control issues.
Troubleshooting steps for encoder control issues.
Troubleshooting for bender and related controls.
Troubleshooting steps for pedal input issues.
Troubleshooting steps for the LCD display.
Troubleshooting steps for no sound or distorted audio.
Troubleshooting steps for the effects processor.
Troubleshooting for low or unbalanced sound volume.
Troubleshooting for incorrect pitch or tuning.
Troubleshooting steps for unwanted noise in the sound.
Troubleshooting for stereo output or balance problems.
Troubleshooting steps for MIDI communication issues.
Troubleshooting for miscellaneous issues.
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