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Musical Instruments & Equipment
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Electronic Keyboard
Casio
GZ-500
MAIN PCB JCM715-MA1M
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26 pages, 1.74 Mb
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MAIN PCB JCM715-MA1M
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Contents
Main
ELECTRICAL
CONTENTS
SPECIFICATIONS
GENERAL
OPERATION
SETTING UP THE KEYBOARD
TRANSMITTING MIDI MESSAGES
Page
RECEIVING MIDI MESSAGES
Page
BLOCK DIAGRAM
Note: Each key has two contacts, the first conatct (1) and second contact (2).
CIRCUIT DESCRIPTION
NOMENCLATURE OF KEYS
KEY MATRIX
10
BUTTON MATRIX
On/Off Octave
Shift Modulation
POWER SUPPLY CIRCUIT
RESET CIRCUIT
CPU (LSI106: HD6433298A42F)
DIGITAL SIGNAL PROCESSOR (LSI102: HG51B155FD)
Page
Page
~
DAC (LSI104: UPD6376GS)
KEY CONTROLLER (LSI107: HG52E35P)
The following table shows the pin functions of LSI107.
FILTER BLOCK
POWER AMPLIFIER (IC402: LA4598)
LED DRIVING
MAJOR WAVEFORMS
Page
MAIN PCB JCM715-MA1M
Page
Page
EXPLODED VIEW
