Casio AP-40 Service Manual page 11

BUTTON MATRIX
L18
L19
L20 TEMPO/BEAT/FIXED
L24
L25
L26
L27
L28
POWER SUPPLY CIRCUIT
The power supply circuit generates four voltages as shown in the following table.
Name
VDD
AVDD
AVCC
AVFF
KI0
STEP BY STEP
TOUCH SELECT
METRONOME
PIANO 2
PIANO 1
VIBRAPHONE PIPEORGAN
SONG SELECT
VALUE DOWN
Voltage
+5 V CPU, Reset IC, Working storage RAM, DSP, Key touch LSI, Sound source
ROM, Effect RAM, Gate array
+5 V DAC
+15 V Filter, Mixer
–15 V Filter, Mixer
KI1
PART L PART R
TRACK A TRACK B
E. PIANO HARPSICHORD
STRINGS CHOIR
CHORUS/TREMOLO
RECORD
VALUE UP
For operation of
— 9 —
KI2 KI3
NEXT
PLAY/STOP
W.BASS
E.BASS
REVERB
DEMO