Block Diagram - Casio AP-20 Service Manual

BRILLIANCE
RAM
256K
HM62256BLP-10
ROM
1M
MX23C1010PC-
12CA25

BLOCK DIAGRAM

PEDAL
SF
SS
DP
HD6435328RC13F
D0 ~ 7
A0 ~ 14
SOLM, SOLP
D/A Converter
µPD6376CX
Filter
Main
Volume
LINE IN
Mixer, Mute Circuit
T6, T7, T10, T11
MIDI
IN OUT P70 ~
P77
MIDI MIDO
CPU
MUTE
A0 ~ 3
DSP
HG51B155FD
BDK, WOK1, SORM, SORP
D/A Converter
µPD6376CX
Filter
Power Amp.
STK4132MK
— 4 —
KC0 ~ 7
Keyboard
Controller
HG52E35P
FI0 ~ 10
P12 ~
SI0 ~ 10
P14
KC0 ~ 4
Switch & LED
Controller
KI0 ~ 3
µPD65005GF-419
L1 ~ 9
LA ~ J
RST
Reset IC
MB3771P
RA0 ~ 19
RD0 ~ 15
EA0 ~ 14
ED0 ~ 15
Keyboard
Switches
LEDs
ROM
8M + 16M
HN62418PD25
HN624116D44
RAM
256K × 2
HM65256BLSP-
10 × 2