Yamaha FB-01 Service Manual page 28

12MHz
Master
O.S.C.
~~r~
1/2
CPU (Z80B)
mPD 70008 AC-6
MEMORY
PROTECT
Circuit
3.0V
160 mAh
+5D
DG
+5A
AG
—5A
POWER
SUPPLY
+5D 400mA
±5A 100mA
POWER
SW
SWITCH
PORT
74HC244
SWITCH
UNIT
LCD
CONTROLLER
HD44780A
Back^Liaht I
16 character
x 1
Negative Type
LCD
LCD UNIT
IRQ
USART
pPD 71051C
500 kHz
4 MHz
1/8
USART
OPP
O.S.C.
4 MHz X tal
4MHz
IRQ
AC
OPP
YM2164
DAC
YM3012
L-OUT
©
©
R-OUT
MUTING-C
Circuit