ELECTRONIC KEYBOARD
CTK-220L
CTK-220L
25 RHYTHMS
POWER/MODE
FINGERED
CASIO CHORD
NORMAL
VOLUME SYNCHRO/
FILL-IN
START/
STOP
TEMPO
TONE
SONG
BANK
STEP 1 STEP 2 STEP 3
MULTI FUNCTION DISPLAY
DEMO
RHYTHM
TONE
SONG BANK
PART
SELECT
RHYTHM
0
5
1
6
2
7
3
8
4
9
TRANSPOSE/TUNE
¢
¢
¢
¢
ON
OFF
20 SONG BANK KEYBOARD
100 TONES
20 SONG BANK
CONTENTS
Page
Specifications ................................................................................................................................... 1
Block Diagram .................................................................................................................................. 2
Circuit Description ............................................................................................................................ 3
Major Waveforms ............................................................................................................................. 6
Printed Circuit Boards ...................................................................................................................... 7
Schematic Diagrams ........................................................................................................................ 8
Exploded View ................................................................................................................................ 14
Parts List ........................................................................................................................................ 15
-- 1 --
SPECIFICATIONS
GENERAL
Number of keys:
49
Polyphonic:
12-note
Preset tones:
100
Transpose:
F# ~ C ~ F: half-note
Auto-rhythms:
25, Tempo: Adjustable, 216 steps (40 ~ 255), initial value: 120
Accompaniment:
CASIO Chord, Fingered, Fill-in pattern, Synchro start
Song bank:
20-tune
Digital volume control:
10 steps (0 ~ 9), initial value: 7
Tuning control:
440 Hz
± 50 cents
Built-in speakers:
10 cm dia.
× 1 (Output: 2 W)
Terminals:
Headphone Jack, Stereo mini Jack [Output impedance: 70
, Output voltage:
3.6 V (rms) MAX]
Auto power off:
Approximately 6 minutes after the last operation
Power source:
2-way AC or DC source
AC: Required optional AD-5 AC adaptor
DC: 6 AA size batteries
Power consumption:
7.7 W
Dimensions (HWD):
85
× 771 × 324 mm (3-3/8 × 30-3/8 × 12-3/4 inches)
Weight:
3.4 kg (7.5 lbs) excluding batteries
ELECTRICAL
Current drain with 9 V DC:
No sound output
160 mA
± 20 %
Maximum volume
840 mA
± 20 %
with white keys C1 to G2 pressed in Synth-Lead 1
Volume: Maximum
Phone output level (Vrms with 8 ohm load):
with key C2 pressed in Synth-Lead 1
98 mV
± 20 %
Speaker output level (Vrms with 4 ohm load):
with key F4 pressed in Synth-Lead 1
2000 mV
± 20 %
Minimum operating voltage:
6.3 V
--
2
--
BLOCK DIAGRAM
Buttons
Illuminant
Keyboard
7 seg. LED
LED Latch
IC2, IC3
Q5 ~ Q8
Q1 ~ Q4
PG
X1, Q11
Reset IC
IC1
Power Supply Circuit
Q301 ~ Q304
D334, D336
Amp.
IC301
LA4598
Filter
Q305
Phone/Output
DC+9 V IN
APO
MD0 ~ MD7
KO8 ~ KO11
LY1 ~
LY7
KO0 ~ KO7
LX0 ~
LX7
KI0 ~ KI7
CPU
LSI1
MSM 6755B-13
LED Driver
LED Driver
-- 3 --
LX0
LX1
LX2
LX3
LX4
LX5
LX6
LX7
LY1
D4
D3
C3
C2
G#2
F#2
D#2
C#2
LY2
C4
E3
B2
D2
A#2
C#3
D#3
F#3
LY3
B3
F3
A2
E2
D#4
C#4
A#3
G#3
LY4
A3
G3
G2
F2
C#5
A#4
G#4
F#4
LY5
E4
C5
D5
B5
D#5
F#5
G#5
A#5
LY6
F4
B4
E5
A5
C6
LY7
G4
A4
F5
G5
CIRCUIT DESCRIPTION
KEY MATRIX
LED MATRIX
KI0
KI1
KI2
KI3
KI4
KI5
KI6
KI7
KO0
C2
G#2
E3
C4
G#4
E5
C6
KO1
C#2
A2
F3
C#4
A4
F5
KO2
D2
A#2
F#3
D4
A#4
F#5
KO3
D#2
B2
G3
D#4
B4
G5
KO4
E2
C3
G#3
E4
C5
G#5
KO5
F2
C#3
A3
F4
C#5
A5
KO6
F#2
D3
A#3
F#4
D5
A#5
KO7
G2
D#3
B3
G4
D#5
B5
KO8
01234
Start/
Stop
Up
Volume
Down
KO9
56789
Down
Volume
Down
Synchro/
Fill-In
K10
Tone
Rhythm
Song
Bank
Part
Select
One Key
One Key
Demo
K11
Step-1
Step-2
Step-3
Fingered
Casio
Chord
Normal
Off
NOMENCLATURE OF KEYS
C2
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
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