Casio CTK-731 Service Manual

— 4 —
BLOCK DIAGRAM
Back Light Driver
T501
Q501, Q502
ROM2
MX23C3210MC-12CA89
LSI3 (32Mbit)
ROM1
MX23C8100MC-12CA99
LSI2 (8Mbit)
RAM2
TC551001BFL-70L
LSI8 (1Mbit)
VBR VBR
VBR
AVDDDVDDFVDDCVDDVCCVDDVC
VDD
APO
NMI
SWCK
LSDT
S1
IC1
LWR, RD S1 HWR, RD
HWR
RD
RD, HWR, LWR
RD, HWR, LWR
1RD, 1HWR, 1LWR
TEND, DREQ, CS2, CS3, B1-5
A0 ~ A15
KI0 ~ KI7
KC0 ~ KC8
SEG1 ~ SEG40
OUT
MIDI
IN
COM1 ~ COM16
LEDA ~ LEDF
LEDCK, LEDCL
D0 ~ D15
D0
D7
~
D8
D15
~
D8
D15
~
Chip Selector
TC74VHCO8F
IC4
S-Register
TC74HC164
IC302
S-Register
TC74HC164
IC301
LCD
FDD Controller
HD63266F
LSI6
3.5" FDD Unit
DF354H064A
Back up
Power
CR2032
Power Supply Circuit
IC204, Q203
Q204, Q208, Q210
Q205,
Q206
CPU
HD6433042SB51F
LSI9
Working
RAM
TC55257
DFL-70L
LSI5
(256Kbit)
LPF
(L)
LPF
(R)
D8 ~ D15 RESET
RESET
RD,
HWR
ECEB, EOEB
EWEB
RESB
RESB
PBO
LCD Driver
SED1278F2A
LSI501
DB4
~DB7
CONT,
LRS,
LR/W
LE
Keyboard
SI0 ~
SI7
FI0 ~
FI7
KC0
~
KC7
WOK1
SOLP
BOK
RAM1
TC551001BFL-70L
LSI7 (1Mbit)
Key Controller
TC190C020AF-001
LSI10
Reset IC
RN5VD40AA
IC3
Out put
(L) (R)
Speakers
LEDs
VDD
Buttons
A1 ~ A4
D0 ~ D15
RA0 ~ RA20
ED0 ~ ED8
EA0 ~ EA14
RD0 ~ RD15
Main
Volume
D/A Converter
µPD6376GS
LSI1
Power Amp.
LA4620
IC201
DSP
HG51B155FD
LSI4
A0 ~ A3
Back Light

Casio CTK-731 Specifications

General

Brand	Casio
Model	CTK-731
Category	Electronic Keyboard
Language	English