Block Diagram - Casio CTK-731 Service Manual

ROM2
ROM1
MX23C8100MC-12CA99 MX23C3210MC-12CA89
LSI2 (8Mbit) LSI3 (32Mbit)
RA0 ~ RA20
RD0 ~ RD15
Working EA0 ~ EA14
RAM
TC55257
ECEB, EOEB
DFL-70L
EWEB
LSI5
(256Kbit)
Keyboard
SI0 ~
KC0
SI7
~
FI0 ~
KC7
FI7
Key Controller
TC190C020AF-001
LSI10
RESB
A1 ~ A4
D0 ~ D15
RESB
A0 ~ A3
DSP
D8 ~ D15
HG51B155FD
RD,
HWR
LSI4
ED0 ~ ED8
WOK1
SOLP
BOK
D/A Converter
µPD6376GS
LSI1
LPF LPF
(L) (R)
Main
Volume
Power Amp.
LA4620
IC201
Out put
(L) (R)
Speakers

BLOCK DIAGRAM

MIDI LCD Driver
IN OUT
SED1278F2A
LSI501
DB4
~DB7
CONT,
LRS,
LR/W
LE
CPU
PBO
HD6433042SB51F
LSI9
RESET
A0 ~ A15
D0 ~ D15
D0
VBR
D7
RAM1
TC551001BFL-70L
LSI7 (1Mbit)
S1 LWR, RD
IC1
Reset IC
RN5VD40AA
IC3
VC VDD VCC CVDD FVDD
Power Supply Circuit
Q205,
IC204, Q203
Q206 Q204, Q208, Q210
— 4 —
SEG1 ~ SEG40
LCD
Back Light
COM1 ~ COM16
LEDCK, LEDCL
S-Register
TC74HC164 LEDA ~ LEDF
IC301
S-Register
LSDT
TC74HC164 KC0 ~ KC8
SWCK IC302
KI0 ~ KI7
NMI
TEND, DREQ, CS2, CS3, B1-5
1RD, 1HWR, 1LWR
Chip Selector
TC74VHCO8F
IC4
D8
VBR
D15
RAM2
TC551001BFL-70L
LSI8 (1Mbit)
S1 HWR, RD
DVDD AVDD VBR
Back up
VDD
Power
CR2032
APO
Back Light Driver
T501
Q501, Q502
LEDs
Buttons
VDD
D8
D15
FDD Controller
HWR
RD HD63266F
LSI6
RESET
3.5" FDD Unit
DF354H064A