Block Diagram - Casio CTK-620L Service Manual

Reset IC IC1
RESET
RN5VD40AA
Sound Source ROM
(24M-bit)
LSI3
MA0 ~ MA19
LH536PNV
MCSB0
RDCEB
MCSB0, 1
Chip Selector
MA19
IC2,3
CE1B
ECEB
Effect RAM
(256K-bit)
EA0 ~
LSI5
EA14
TC55257DFL-
EIO0 ~
70L(EL)
EIO7
Phones/
Output
Speakers
(L)
(R)

BLOCK DIAGRAM

Working Storage
RAM (256K-bit)
LSI4
OUT
TC55257DFL-70L(EL)
RACEB
MD0
MA0
~ ~
MD7
MA14
MD0 ~ MD15
GT913F(T)
MA0,
LRCK, SO
MA1
BCK, SINK
DSP
LSI2
HG51B277FB-1
LRCK
SO
BCK
D/A Converter
LSI6
UPD6379GR-E1
R OUT
Filter
Q213 ~ Q216
Main
Volume
Power Amplifier
IC201
TA8229K
MIDI
PO10, PO17
IN
PO22, PO23
PA4 ~ PA6
CPU
LSI1
MD0 ~ 3
UPD65005
MA0 ~ 2
LCBE
KI0 ~ KI2
FI9
FI10
NMI
PA0, PA1
PB0 ~ PB3
PB4
L OUT
— 3 —
SEG1 ~ SEG40
LCD Driver
LSI401
SED1278F0A
COM1 ~ COM16
FI0 ~ FI7
SI0 ~ SI7
KC0 ~ KC7
LED
GA
Driver
LSI7
Q12 ~ Q14
LED
GF-419
Driver
Q1 ~ Q11
VDD
Power Switch
Buttons
Assingnable Jack
LCDD LVDD DVDD
AVDD
VCC
APO Power Supply Circuit
Q201 ~ Q208,
D206 ~ 208, D210
LCD
Illuminant
Keyboard
L21
~ L23
LED
L0
~ L20
VLCC
VDD VC