Block Diagram - Casio WK-1200 Service Manual

Reset IC
RESET
IC2
RN5VD40AA
Sound Source ROM
(16M-bit)
LSI3
MX23C1610MC-
12CA64
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
LRCK
SO
BCK
D/A Converter
IC1
UPD6379GR
Filter
Q308 ~ Q311
Main
Volume
Power Amplifier
IC301
LA4620
MIDI
P10, P13
IN
P14, P17
P23
CPU
LSI1
GT-913F
NMI
PA0 ~ PA5
PB0 ~ PB3
PB4
APO
— 3 —
SEG1 ~ SEG40
LCD Driver
LSI501
SED1278F0A
COM1 ~ COM16
FI0 ~ FI9
SI0 ~ SI9
Keyboard
KC0 ~ KC7
KI0 ~ KI2
PB0 ~ PB3
FI10
VDD
Power Switch
Buttons
Assingnable Jack
LVDD CVDD
AVDD
VCC VDD
Power Supply Circuit
Q301 ~ Q304, 306, 307
D307, 310
LCD
VC