Block Diagram - Casio WK-1800 Service Manual

ROM2
ROM1
LHMN5KPN
LHMN5KPP
LSI2 (32Mbit)
LSI1 (32Mbit)
RA0 ~ RA21
RD0 ~ RD15
Working
EA0 ~ EA14
RAM
ED0 ~ ED8
TC55257
ECEB, EOEB
GFL-70L
EWEB
LSI4
(256Kbit)

BLOCK DIAGRAM

Keyboard
SI0 ~
KC0
SI9
~
FI0 ~
KC7
FI9
Key Controller
TC190C020AF-001
LSI6
RESB
A1 ~ A4
D0 ~ D15
RESB
A0 ~ A3
DSP
D8 ~ D15
HG51B155FD
RD,
HWR
LSI3
BOK
D/A Converter
µPD63200GS
LSI5
LPF LPF
(L) (R)
Main
Volume
Power Amp.
LA4663
IC201
Out put
(L) (R)
Speakers
SEG1 ~ SEG40
MIDI LCD Driver
IN OUT
SED1278F2A
LSI601
COM1 ~ COM16
LDB4
~LDB7
LEDCK, LEDCL
CONT,
LRS,
LR/L
LE
CPU LSDT
PBO
SWCK
HD6433048SA89F
LSI9
NMI
RESET
RD, HWR, LWR
A0 ~ A15
D0 ~ D15
D0
VBR
D7
RAM1
TC551001CF-70L
LSI7 (1Mbit)
CE1 LWR, RD
IC6
Reset IC
RN5VD40A
IC5
VC VDD VCC CVDD FVDD DVDD AVCC AVDD
Power Supply Circuit
Q209,
IC202, Q207
Q213 Q208, Q211, Q214,
Q215
— 5 —
LCD
Back Light
Back Light Driver
TE-CFL733-IMI
Q601, Q602
S-Register
TC74HC164 LEDA ~ LEDH
IC401
S-Register
TC74HC164 KC0 ~ KC7
IC402
KI0 ~ KI7
TEND, DREQ, CS2, CS3, 8/5
Chip Selector
TC74HC08
IC4
D8
VBR
D15
RAM2
TC551001CFL-70L FDD Controller
HWR
LSI8 (1Mbit)
RD
CE1 HWR, RD
RESET
VBR
Back up
VDD
Power
CR2032
APO
LEDs
Buttons
VDD
D8
D15
HD63266F
LSI10
3.5" FDD Unit
DF354H064C