Casio WK-1500, Service Manual

Page: 6 / 23

— 6 —
Name Voltage For operation of
VDD +5.2 V CPU, Reset IC, Working storage RAM, KO signal generator
DVDD +5.3 V DSP, Key touch LSI, Sound source ROM, Effect RAM
AVDD +5.1 V DAC, Filter
LVDD +5.2 V LED Driver
VCC +12 V Pilot lamp
VC +12 V Power amplifier
POWER SUPPLY CIRCUIT
The power supply circuit generates six voltages as shown in the following table. VDD voltage is always
generated. The others are controlled by APO signal output from the CPU.
NOMENCLATURE OF KEYS
F#1
F1
G#1 A#1 C#2 D#2 F#2 G#2 A#2 C#3 D#3 F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 C#6 D#6 F#6 G#6 A#6 C#7 D#7 F#7
E1 G1 A1 B1 C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6 D6 E6 F6 G6 A6 B6 C7 D7 E7 F7 G7
KI1 KI2 KI3 KI4 KI5 KI6 KI7
KO0 SPLIT LAYER CH7/CHORD2
CH8/
CHORD3
CH9/BASS
CH10/
RHYTHM
KO1
TRANSPOSE
/TUNE
MAGICAL
PRESET
MIDI RHYTHM TONE PAD
KO2 CH4/LOWER2 CH5/PAD
CH6/
CHORD1
CH2/
UPPER2
CH3/
LOWER1
KO3 3 6 9 DEMO
TOUCH
RESPONSE
DIGITAL
EFFECT
KO4 2 5 8
CH1/
UPPER1
1 4 7
KO5
ACM
VOLUME
SONG
MEMORY
MODULATION MIXER 0 – +
KO6
SYNCH/
ENDING
VAR./FILL-IN
NORMAL/
FILL–IN
INTRO F E D
KO7 MODE A B C
START/
STOP
TEMPO
DOWN
TEMPO UP
KO8 CH11/TR1 CH12/TR2 CH13/TR3 CH14/TR4 CH15/TR5 CH16/TR6
KO9
BANK
SELECT
A B C D E STORE
BUTTON MATRIX