GM SOUND KEYBOARD
WK-1500
WK-1500
PITCH
BEND
MC-Service
-- 2 --
CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SPECIFICATIONS
GENERAL
Number of keys:
76
Polyphonic:
32-note
Digital effects:
10
REVERB 1, REVERB 2, REVERB 3, CHORUS, TREMOLO, PHASE
SHIFTER, ORGAN SPEAKER, ENHANCER, FLANGER, LOUDNESS
Pads:
180 (six pads
× 30 sets)
Phrases (22 sets), drums/percussion (8 sets)
Melody tone matches chord
Demo tunes:
3, sequential repeat playback
Auto-accompaniment
Rhythm patterns:
100
Tempo:
Adjustable (216 levels,
= 40 to 255)
Chords:
3 types (CASIO Chords, Fingered, Full-Range Chords)
Pads:
Rhythm, bass, Chord 1, Chord 2, Chord 3 (adjustable on/off, tone, volume,
pan, effect send, fine tune, coarse tune, expression settings)
Magical presets:
50 types (Break beat, Melodycomp, Shadow Drum, Free Session)
Registration memory:
10
Tone changes, tempo setting, auto-accompaniment volume setting, mode,
layer on/off, Mixer settings, effect type, split on/off, rhythm type, auto-
accompaniment rhythm assignment, pad type, chord fingering method,
touch response setting, MIDI settings (including assignable jack settings),
Magical Preset type
Mixer
Number of channels:
16
Parameters:
TONE, VOLUME, PAN, EFFECT SEND, FINE TUNE, COARSE TUNE,
EXPRESSION, MUTE
MIDI monitor:
16 LED monitor
Song memory
Number of songs:
2
Tracks:
6 (individual adjustment of on/off, tone, volume, pan, effect send, fine tune,
coarse tune, expression)
Type:
Real-time
Capacity:
Approximately 5,200 notes
Other functions
Transpose:
25 levels (1 octave lower C to 1 octave upper C)
Tuning:
Adjustable: A4 = 440 Hz
± 50 cents
Pitch Bender:
Adjustable range:
± 12 semitones
Tone Expander:
Individual adjustment of volume, tuning, pan, effect send for each layer and
split tone
-- 3 --
MIDI:
16-timbre multi-timbre receive (General MIDI Level 1)
Built-in speakers:
12 cm diameter
× 2 (output: 5 W + 5 W)
Input/Output Jacks
Power supply:
12 V DC
Headphones:
Stereo standard jack
Output jacks:
Output impedance: 100
Output voltage 2.5 V (RMS) MAX
Assignable Jack:
Standard jack (sustain, sostenuto, soft, rhythm start/stop)
MIDI terminals:
IN, OUT
Auto power off:
Approximately 6 minutes after the last operation
Power source:
2-way AC or DC source
AC: AC adaptor
DC: 6D size dry batteries
Power consumption:
18 W
Dimensions (HWD):
116.1
× 30.2 × 11.0 mm (45-3/4 × 11-7/8 × 4-5/16 inches)
Weight:
6.8 kg (15.0 lbs) excluding batteries
ELECTRICAL
Current drain with 9 V DC:
No sound output
480 mA
± 20%
Maximum volume
with 10 polyphonic notes in tone No. 081
1720 mA
± 20%
Volume; maximum
Phone output level (Vrms with 8 load each channel):
Left channel 175 mV
± 20%
with key C2 pressed in tone No. 042
Line output level (Vrms with 47 k load each channel):
Left channel 1420 mV
± 20%
with key C2 pressed in tone No. 042
Minimum operating voltage:
12.0 V
MC-Service
-- 4 --
KC0 ~
KC7
SI0 ~ SI7
FI0 ~ FI7
Key Controller
LSI107
HG52E35P
Working Storage RAM
(64K-bit)
LSI105
SRM2264LM90-B
KO1 ~ KO3
LED driver
IC371
BA612
LS0 ~
LS7
Buttons
KI1 ~ KI5
Power Switch
IN
EA0 ~ EA14
ED0 ~ ED7
DSP
LSI102
HG51B115FD
RA0 ~ RA19
RD0 ~ RD15
Sound Source ROM
(16M-bit)
LSI101
TC5316200CF-C112
WCK1
SLOP
BCK
D/A Converter
LSI104
UPD6376GS
Filter
IC101
Main
Volume
Power Amplifier
IC402
LA4598
CPU
LSI14
HD6433294A19F
Keyboard
A0 ~ A14
POWER
Power Supply Circuit
IC401, Q401 ~ Q405
VCC
AVDD
VDD
LVDD
DVDD
VC
Effect RAM
(256K-bit)
LSI103
LC33832M-70
D0~D7
Speakers
Output
A0 ~
A14
A0 ~ A3
A0 ~ A2
7-seg. LED
LEDs
LED driver
Q104 ~ Q111
KO Signal
Generator IC102
TC74HC174AF
La ~ Lg, Lp
MIDI
OUT
Reset IC
IC5
RH5VL36AA
P40
P41
KO0 ~
KO5
Filter
IC101
RESET
BLOCK DIAGRAM
MC-Service
-- 5 --
CIRCUIT DESCRIPTION
KEY MATRIX
KC0
KC1
KC2
KC3
KC4
KC5
KC6
KC7
FI0
E1 (1)
F1 (1)
F#1 (1)
G1 (1)
G#1 (1)
A1 (1)
A#1 (1)
SI0
E1 (2)
F1 (2)
F#1 (2)
G1 (2)
G#1 (2)
A1 (2)
A#1 (2)
FI1
B1 (1)
C2 (1)
C#2 (1)
D2 (1)
D#2 (1)
E2 (1)
F2 (1)
F#2 (1)
SI1
B1 (2)
C2 (2)
C#2 (2)
D2 (2)
D#2 (2)
E2 (2)
F2 (2)
F#2 (2)
FI2
G2 (1)
G#2 (1)
A2 (1)
A#2 (1)
B2 (1)
C3 (1)
C#3 (1)
D3 (1)
SI2
G2 (2)
G#2 (2)
A2 (2)
A#2 (2)
B2 (2)
C3 (2)
C#3 (2)
D3 (2)
FI3
D#3 (1)
E3 (1)
F3 (1)
F#3 (1)
G3 (1)
G#3 (1)
A3 (1)
A#3 (1)
SI3
D#3 (2)
E3 (2)
F3 (2)
F#3 (2)
G3 (2)
G#3 (2)
A3 (2)
A#3 (2)
FI4
B3 (1)
C4 (1)
C#4 (1)
D4 (1)
D#4 (1)
E4 (1)
F4 (1)
F#4 (1)
SI4
B3 (2)
C4 (2)
C#4 (2)
D4 (2)
D#4 (2)
E4 (2)
F4 (2)
F#4 (2)
FI5
G4 (1)
G#4 (1)
A4 (1)
A#4 (1)
B4 (1)
C5 (1)
C#5 (1)
D5 (1)
SI5
G4 (2)
G#4 (2)
A4 (2)
A#4 (2)
B4 (2)
C5 (2)
C#5 (2)
D5 (2)
FI6
D#5 (1)
E5 (1)
F5 (1)
F#5 (1)
G5 (1)
G#5 (1)
A5 (1)
A#5 (1)
SI6
D#5 (2)
E5 (2)
F5 (2)
F#5 (2)
G5 (2)
G#5 (2)
A5 (2)
A#5 (2)
FI7
B5 (1)
C6 (1)
C#6 (1)
D6 (1)
D#6 (1)
E6 (1)
F6 (1)
F#6 (1)
SI7
B5 (2)
C6 (2)
C#6 (2)
D6 (2)
D#6 (2)
E6 (2)
F6 (2)
F#6 (2)
FI8
G6 (1)
G#6 (1)
A6 (1)
A#6 (1)
B6 (1)
C7 (1)
C#7 (1)
D7 (1)
SI8
G6 (2)
G#6 (2)
A6 (2)
A#6 (2)
B6 (2)
C7 (2)
C#7 (2)
D7 (2)
FI9
D#7 (1)
E7 (1)
F7 (1)
F#7 (1)
G7 (1)
SI9
D#7 (2)
E7 (2)
F7 (2)
F#7 (2)
G7 (2)
Note: Each key has two contacts, the first conatct (1) and second contact (2).
Key
Second contact (2)
First contact (1)
FI
KC
SI