Casio LK-90TV - System Block Diagram

— 3 —
BLOCK DIAGRAM
Power AMP
LA4635A
IC202
RESET
IC3, Q24
ROM(4MB)
MR27V3202F
IC42
Main Volume
RXDI
RXDI, TXDO
TXDO
HEADPHONE
Keyboard
LCD Controller
ML-9040-B02GA
IC1 (SCH-M649-LCA PCB)
Button
LCD
FI0~7
SI0~7
KC0~7
MD0~15
RAM(1MB)
CY62126DV30LL55ZI
IC18
Monitor Output
Controller
IC15(SPG200A-HL091)
IC43(MR27V802F)
Keyboard LED Controller
UPD65881GK-1019-ETA
IC27
VD5(5.3V)
VE5(5V)
VA5(5.2V)
VC9(9.0V)
VCP(9.0V)
Power Supply
Q2 ~ D9
D4 ~ D7
MD0~15
SP
SP
RESET
C-TVSYG
SYSRSTB
TV-RXD
TV-TXD
Sustain Jack
Monitor Jack
MA1~21
MA1~17
MPU
ML6763-NNTC-116
IC1
MIC
MIC VR
Filter
NJM2068DD
IC3
Filter
NJM2068DD
IC1
(M649-MAA2 PCB)