Block Diagram - Casio CTK-900 Service Manual

Reset IC
IC4
R1151N001C-TR
EA0 ~ EA15,EA18
RAM (1Mbit)
IC2
CY62128VLL-70AZI
ED12 ~ ED19
16.384MHz
MAIN PCB (M707-MD1)
PEDAL
Assingnable Jack
MIDI
IN
D209
OUT
Q207
(9V)
VCP
Power Supply Circuit
Q201 ~ Q205, D201,
D204, D205
Battery
AC Adaptor
DC 9V
D201
SUB PCB (M707-MA2)

BLOCK DIAGRAM

LCD Controller
ML9040-B02GA (IC501)
CONT
RESET
MPU
IC10
uPD914AGM-3ED
DAC IC3
µPD6379LGR-E1
LOUT
(5V) (5V) (9V)
Filter
VA5 VD5 VC
IC202, IC203
APO
Power Amplifier
IC201
ADIN
LA4636
APO Cancellation
Phones/Output
— 3 —
LCD PCB
(M705-LCD1M)
MA0 ~ MA20
MA0 ~ MA21
MD0 ~ MD15
MA0 ~ MA15, MA25
MD0 ~ MD7
MA1 ~ MA3
MD0 ~ MD15
Keyboard
ROUT
Keyboard PCB
(CSM618T-KY1M/KY2M)
Main
Volume
CONSOLE PCB
(M705-CN2M)
Buttons
Speakers
NMI, KI0 ~ KI2, FI8 ~ FI0, KC0 ~ KC7
(L)
LD14 ~ LD16, LD20 ~ LD22
(R)
ROM (128Mbit)
IC8
MR27V12800J137TN3D
RAM (1Mbit)
IC12
CY62128VLL-70AZI
KEY/BOTTON
CONTROLLER
IC13
TC190C020AF-001
SI0 ~ SI7
FI0 ~ FI7
KC0 ~ KC7
CONSOLE PCB (M705-CN1M)