Block Diagram - Casio CTK-631 Service Manual

Reset IC
RESET
IC2
RN5VD40AA
Sound Source ROM
(24M-bit)
LSI3
LH536PY8
MA0, MA1
EA0 ~
Effect RAM
EA14
(256K-bit)
LSI5
TC55257DFL-
EIO0 ~
70L(EL)
EIO7
Output
Speakers

BLOCK DIAGRAM

Working Storage
RAM (256K-bit)
LSI4
OUT
TC55257DFL-70L(EL)
MD0
MA0
~
~
MD7
MA14
MD0 ~ MD15
MA0 ~ MA19
LRCK, SO
BCK, SINK
DSP
LSI2
HG51B277FB-1
WCKO
SO
BCK
D/A Converter
IC1
UPD6379GR
Filter
Q308 ~ Q311
Main
Volume
Power Amplifier
IC301
TA8248K
MIDI
P10, P13
IN
P14, P17
P23
CPU
LSI1
GT913F(T)
NMI
PA0 ~ PA5
PB0 ~ PB3
PB4
— 3 —
SEG1 ~ SEG40
LCD Driver
LSI501
SED1278F2A
COM1 ~ COM16
FI0 ~ FI9
SI0 ~ SI9
Keyboard
KC0 ~ KC7
KI0 ~ KI2
PB0 ~ PB3
FI10
VDD
Power Switch
Buttons
Assingnable Jack
LCD