Block Diagram - Casio CTK-680 Service Manual

MIDI
IN
OUT
Keyboard
FI0 ~ FI7
KC0 ~
SI0 ~ SI7
KC7
Key Controller
LSI16
HG52E35P
Effect RAM
EA0 ~ EA14
(256K-bit)
LSI13
LC33832M-70
ED0 ~ ED7
Output
Speakers

BLOCK DIAGRAM

LED Driver
Q15 ~ Q18
La ~ Lg, Lp
LD0 ~
LD7
CPU
LSI14
HD6433294A33F
A0 ~
A14
D0~D7
A0 ~ A14
A0 ~ A2
A0 ~ A3
DSP
IC11
HG51B155FD
WCK1 SLOP
D/A Converter
IC11
UPD6376GS
Filter
Filter
Q208 Q207
Main
Volume
Power Amplifier
IC202
LA4598
— 4 —
LC1 ~ LC4, LC8
7-seg. LED
LEDs
KOC
Gate Array
KOD
LSI17
CLK
UPD65611GB-019
KI1 ~ KI4
NMI
RES
RH5VL36AA
RA0 ~ RA20
Sound Source ROM
MX23C2410MC-12CA54
RD0 ~ RD15
BCK
LVDD
VC
VCC
Power Supply Circuit
IC203, Q201 ~ Q206
LED Driver
IC301
BA612
KO1 ~ KO4, KO8
KO0 ~
Buttons
KO9
Power Switch
Reset IC
IC13
Working Storage RAM
(256K-bit)
LSI15
TC55257DFL-70L
(24M-bit)
LSI12
DVDD
AVDD
VDD