Casio WK-1200 Service Manual page 6

BUTTON MATRIX
KC0 KC1
DRUM DRUM
FI10 PAD 3 PAD 1
CHORD 3 CHORD 1
DRUM DRUM
KI0 PAD 4 PAD 2
CHORD 4 CHORD 2
DRUM
KI1 PAD 5 STEP
CHORD 5
DRUM
KI2 PAD 6 MEMORY
CHORD 6
PA0
FULL RANGE
PB0
CHORD
PB1 FINGERED
CASIO SYNCHRO/
PB2
CHORD
VARIATION/
PB3 NORMAL
POWER SUPPLY CIRCUIT
The power supply circuit generates five voltages as shown in the following table. VDD and VC voltages
are always generated. The others are controlled by APO signal from the CPU.
Name Voltage
VDD +5 V
AVDD +5 V
LVDD +5.6 V
VCC,VC +9 V
CVDD +5 V
KC2 KC3
PITCH
BEND
ENTER
PITCH G
START/
BEND
STOP
TEMPO
TEMPOG
PA1 PA2
TOUCH
INTRO
RESPONSE
NORMAL/ FREE
FILL-IN SESSION
LAYER
ENDING
SPILIT
FILL-IN
CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM
DAC, Filter
LCD driver
Power amplifier, Pilot lamp
Power jack, Pedal jack, MIDI jacks, Source voltage for LCD backlight
KC4 KC5
9 6
8 3
7 2
4 5
PA3
REVERB
ACCOMP
VOLUME
SYNTH
MIXER
For operation of
— 5 —
KC6 KC7
+ TONE
— RHYTHM
0 DEMO
TRANSPOSE/
1
TUNE/MIDI