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Musical Instruments & Equipment
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Electronic Keyboard
Casio
CTK-630
SCHEMATIC DIAGRAMS
1
13
20
20
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20 pages, 1.86 Mb
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SCHEMATIC DIAGRAMS
Main PCB JCM461-MA1M
Notes:
1.
All capacitance values are indicated in "
µ
F" (p=10
-6
µ
F).
2.
All resistance values are indicated in "
Ω
" (k=10
3
Ω
, M=10
6
Ω
).
Contents
Main
ELECTRONIC KEYBOARD
(with price)
CTK-630
CONTENTS
ELECTRICAL
SPECIFICATIONS
GENERAL
BLOCK DIAGRAM
CIRCUIT DESCRIPTION
KEY MATRIX
5
Key Second contact (2) First contact (1)
FI KC SI
POWER SUPPLY CIRCUIT
NOMENCLATURE OF KEYS
RESET CIRCUIT
CPU (LSI105: UPD912GF-3BA)
DIGITAL SIGNAL PROCESSOR (LSI101: HG51B227FB)
From the DAC To main volume
DAC (IC102: UPD6379GR)
FILTER BLOCK
POWER AMPLIFIER (IC101: LA4598)
LED DRIVING
TROUBLESHOOTING
MAJOR WAVEFORMS
1
2
3
5
PRINTED CIRCUIT BOARDS
Main PCB JCM461-MA1M
18172019 1416 1015 89 12765 34 112 113
NO.
45678
SCHEMATIC DIAGRAMS