Block Diagram - Casio AT-1 Service Manual

Keyboard
FI0 ~ FI7
KC0 ~
SI0 ~ SI7
KC7
Key Touch LSI
LSI106
HG52E35P
Effect RAM
EA0 ~ EA12
(64K-bit)
LSI107
SRM2264LC90,10
ED0 ~ ED7
Output
Speakers

BLOCK DIAGRAM

Reset IC
IC104
RE5VA35AA
Working Strage
RAM (64K-bit)
LSI104
SRM2264LC90,10
A0 ~
A12
D0~D7
A0 ~ A14
A0 ~ A2
DSP
LSI105
HG51B155FD
WCK1 SLOP
D/A Converter
LSI101
UPD6376CX
Filter
Filter
IC105 IC105
Main
Volume
Power Amplifier
IC102
LA4598
— 3 —
7-Seg.
La ~ Lg, Lp
LED
LEDs
CLK
LED driver
Q109 ~ Q116
KO
LD0 ~ LD7
RESET
CPU
LSI102
HD6433298A36P
A0 ~ A3
RA0 ~ RA19
Sound Source ROM
TC5316200CP-C106
RD0 ~ RD15
BCK
LVDD
VC
VCC
Power Supply Circuit
IC101, Q1 ~ Q4
LC1 ~ LC4
LED driver
LO0 ~ LO4
IC301/302
BA612
KO Signal
Generator
KO0 ~ KO10
IC303/304
TC74HC174P
Buttons
KI1 ~ KI7
VDD
POWER
Power Switch
MIDI
OUT
IN
(16M-bit)
LSI103
APO
DVDD
AVDD VDD