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CTK-520L
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100 TONES |
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50 RHYTHMS |
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40 SONG BANK |
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PIANO |
ORGAN |
GUITAR/BASS |
STRINGS/ENSEMBLE |
BRASS |
REED/PIPE |
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SYNTH-SOUND 1 |
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SYNTH-SOUND 2 |
LAYER |
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SPLIT/PERCUSSION |
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POPS |
ROCK |
JAZZ/DANCE |
EUROPEAN/LATIN |
VARIOUS |
00 |
WHEN YOU WISH |
09 |
JOY TO THE WORLD |
18 |
STAND BY ME |
26 |
THE GIRL FROM IPANEMA |
36 |
MOON RIVER |
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00 |
PIANO 1 |
10 |
ELEC ORGAN 1 |
20 |
GUT GUITAR |
30 |
VIOLIN |
40 |
TRUMPET |
50 |
SOPRANO SAX |
60 SYNTH-LEAD 1 |
70 |
PEARL DROP |
80 |
STRINGS PIANO |
90 |
BASS/PIANO |
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00 |
POP FUSION |
10 |
ROCK WALTZ |
20 |
BIG BAND |
30 |
POLKA |
40 |
MERENGUE |
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UPON A STAR |
10 |
JINGL BELLS |
19 |
YOU CAN’T HURRY LOVE |
27 |
LOVE STORY |
37 |
FUR ELISE |
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01 |
PIANO 2 |
11 |
ELEC ORGAN 2 |
21 |
ACOUS GUITAR |
31 |
CELLO |
41 |
TUBA |
51 |
ALTO SAX |
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61 |
SYNTH-LEAD 2 |
71 |
COSMIC SOUND |
81 |
STRINGS EP |
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91 |
BASS/E.PIANO |
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01 |
BALLAD |
11 |
SLOW ROCK |
21 |
SLOW SWING |
31 |
MARCH |
41 |
REGGAE |
01 |
TWINKLE TWINKLE |
11 |
OVER THE RAINBOW |
20 |
IMAGINE |
28 |
FROM THE NEW WORLD |
38 |
TURKISH MARCH |
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02 |
HONKY-TONK |
12 |
ELEC ORGAN 3 |
22 |
JAZZ GUITAR |
32 |
HARP |
42 |
BRASS SECTION |
52 |
TENOR SAX |
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62 |
SYNTH-LEAD 3 |
72 |
SOUNDTRACK |
82 |
CHOIR EP |
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92 |
BASS/VIB |
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02 |
POP BALLAD |
12 |
SOFT ROCK 1 |
22 |
FOX TROT |
32 |
SLOW WALTZ |
42 |
SKA |
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LITTLE STAR |
12 |
O CHRISTMAS TREE |
21 |
I JUST CALLED TO |
29 |
MISTY |
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(RONDO ALLA TURCA) |
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03 |
STUDIO PIANO |
13 |
ELEC ORGAN 4 |
23 |
ELEC GUITAR |
33 |
STRINGS 1 |
43 |
FRENCH HORN 1 |
53 |
OBOE |
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63 |
SYNTH-CALLIOPE |
73 |
SPACE PAD |
83 |
CHOIR ORGAN |
93 |
BASS/G.GUITAR |
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03 |
RAP POP |
13 |
SOFT ROCK 2 |
23 |
JAZZ WALTZ |
33 |
WALTZ |
43 |
TEX-MEX |
02 |
ACH DU LIEBER AUGUSTIN |
13 |
YANKEE DOODLE |
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SAY I LOVE YOU |
30 |
MINUET(J.S.BACH) |
39 |
INVENTION no.1 |
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04 |
ELEC PIANO 1 |
14 |
CHURCH ORGAN |
24 |
MUTE GUITAR |
34 |
STRINGS 2 |
44 |
FRENCH HORN 2 |
54 |
CLARINET |
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64 |
SYNTH-PAD 1 |
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74 |
SYNTH-SFX |
84 |
STRINGS GUITAR |
94 |
BASS/D.GUITAR |
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04 |
SOUL BALLAD |
14 |
FOLKIE POP |
24 |
ACID JAZZ |
34 |
TANGO |
44 |
FOLKLORE |
03 |
AMAZING GRACE |
14 |
SANTA LUCIA |
22 |
LITTLE BROWN JUG |
31 |
CANON(PACHELBEL) |
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05 |
ELEC PIANO 2 |
15 |
PIPE ORGAN |
25 |
DIST GUITAR |
35 |
STRINGS 3 |
45 |
BRASS 1 |
55 |
PICCOLO |
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65 |
SYNTH-PAD 2 |
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75 |
SE 1 (VEHICLE) |
85 |
STRINGS HARP |
95 |
STRINGS/PIANO |
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05 |
FUNKY POP |
15 |
60’s SOUL |
25 |
LATIN FUSION |
35 |
BOSSA NOVA |
45 |
COUNTRY |
04 |
ODE TO JOY |
15 |
WHEN THE SAINTS |
23 |
MARCH FROM |
32 |
SILENT NIGHT |
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06 |
ELEC PIANO 3 |
16 |
REED ORGAN |
26 |
WOOD BASS |
36 |
SYNTH-STR 1 |
46 |
BRASS 2 |
56 |
FLUTE |
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66 |
SYNTH-PAD 3 |
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76 |
SE 2 |
(TELEPHONE) |
86 |
BRASS STRINGS |
96 |
STRINGS/TRUMPET |
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06 |
16BEAT |
16 |
ROCK |
26 |
TRANCE |
36 |
SAMBA |
46 |
SLOW GOSPEL |
05 |
LONDON BRIDGE |
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GO MARCHING IN |
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"THE NUTCRACKER" |
33 |
CLAIR DE LUNE |
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07 |
ELEC PIANO 4 |
17 |
ACCORDION |
27 |
ELEC BASS |
37 |
SYNTH-STR 2 |
47 |
SYNTH-BRASS 1 |
57 |
RECORDER |
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67 |
GLESS HARMONICA |
77 |
SE 3 |
(SPACE) |
87 |
VIB PAD |
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97 |
VIBRAPHONE |
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07 |
8BEAT 1 |
17 |
HEAVY METAL |
27 |
DISCO |
37 |
MAMBO |
47 |
ADANI |
06 |
LONDONDERRY AIR |
16 |
ALOHA OE |
24 |
THE ENTERTAINER |
34 |
ETUDE op.10, no.3 |
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08 |
HARPSICHORD |
18 |
BANDONEON |
28 |
SLAP BASS |
38 |
CHOIR |
48 |
SYNTH-BRASS 2 |
58 |
FLUTE ENSEMBLE |
68 COUNTRY FARM |
78 |
SE 4 |
(INVADER) |
88 |
12STR GUITAR |
98 |
MARIMBA |
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08 |
8BEAT 2 |
18 |
50’s ROCK |
28 |
RAP |
38 |
RHUMBA |
48 |
BAROQUE |
07 |
GREENSLEEVES |
17 SPRING FROM |
25 |
SERENADE |
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"CHANSON DE L’ ADIEU" |
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09 |
CLAVELECTRO |
19 |
HARMONICA |
29 |
BANJO |
39 |
VOICE |
49 |
SYNTH-BRASS 3 |
59 |
WHISTLE |
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69 |
SYNTH-BASS |
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79 |
SE 5 |
(FUNNY) |
89 |
CHOIR STRINGS |
99 |
PERCUSSION |
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09 |
POPS |
19 |
CHICAGO BLUES |
29 |
FUNK |
39 |
CHA-CHA-CHA |
49 |
ENKA |
08 |
AULD LANG SYNE |
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"THE FOUR SEASONS" |
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"EINE KLEINE NACHTMUSIK" 35 |
THE ENTERTAINER |
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POWER/MODE |
VOLUME |
SYNCHRO/ START/ |
TEMPO |
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TONE |
SONG |
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3-STEP LESSON |
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¢ |
FILL-IN |
STOP |
¢ |
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0 |
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1 |
2 |
3 |
4 |
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BANK |
STEP 1 |
STEP 2 STEP 3 |
DEMO |
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FINGERED |
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ON |
CASIO CHORD |
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NORMAL |
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OFF |
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⁄ |
⁄ |
5 |
6 |
7 |
8 |
9 |
PART |
TONE RHYTHM |
SONG |
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TRANSPOSE/TUNE |
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RHYTHM |
SELECT |
ONE KEY PLAY |
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CTK-520L
ELECTRONIC KEYBOARD
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CONTENTS |
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Page |
Specifications ................................................................................................................................... |
1 |
Block Diagram .................................................................................................................................. |
2 |
Circuit Description ............................................................................................................................ |
3 |
Major Waveforms ............................................................................................................................. |
6 |
Printed Circuit Boards ...................................................................................................................... |
7 |
Schematic Diagrams ........................................................................................................................ |
8 |
Exploded View................................................................................................................................ |
14 |
Parts List ........................................................................................................................................ |
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SPECIFICATIONS |
GENERAL |
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Number of keys: |
61 |
Polyphonic: |
12-note |
Preset tones: |
100 |
Transpose: |
F# ~ C ~ F: half-note |
Auto-rhythms: |
50, Tempo: Adjustable, 216 steps (40 ~ 255), initial value: 120 |
Accompaniment: |
CASIO Chord, Fingered |
Song bank: |
40-tune |
Digital volume control: |
10 steps (0 ~ 9), initial value: 7 |
Tuning control: |
440 Hz ± 50 cents |
Built-in speakers: |
10 cm dia. 2 W input rating: 2 pcs |
Terminals: |
Headphone Jack (Output impedance: 50 ohm, Output voltage: 4.6 V (rms) MAX |
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AC Adapter Jack (9 V) , Stereo standard Jack [Output impedance: 50 Ω, Output |
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voltage: 2 V(rms) MAX] |
Auto power off: |
Approximately 6 minutes after the last operation |
Power source: |
2-way AC or DC source |
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AC: AC adapter |
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DC: 6 AA size |
Power consumption: |
7.7 W |
Dimensions (HWD): |
89 × 924 × 325 mm (3-1/2 × 36-7/16 × 12-13/16 inches) |
Weight: |
4.35 kg (9.6 lbs) excluding batteries |
ELECTRICAL
Current drain with 9 V DC: |
130 mA ± 20% |
No sound output |
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Maximum volume |
810 mA ± 20% |
with white keys C1 to G2 pressed in Synth-Lead 1 |
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Volume: Maximum |
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Phone output level (Vrms with 8 ohm load each channel): |
95 mV ± 20% |
with key D3 pressed in Synth-Lead 1 |
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Speaker output level (Vrms with 4 ohm load each channel): |
1050 mV ± 20% |
with key D3 pressed in Synth-Lead 1 |
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Minimum operating voltage: |
6.3 V |
— 1 —
BLOCK DIAGRAM
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Sound Source ROM |
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7 seg. LED |
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LSI2 |
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MX23C1010MC-12CA45 |
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MA0 |
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LED Latch |
IC2, IC3 |
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Phone/Output |
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MA16 |
MD0 ~MD7 |
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Filter (L) |
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KO8 ~KO11 |
Buttons |
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Amp. |
Q306 |
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2 — |
IC301 |
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LA4598 |
Filter (R) |
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— |
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Q305 |
CPU |
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KI0 ~KI7 |
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LSI1 |
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MSM 6755B-07 |
KO0 ~KO7 |
Illuminant |
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Power |
Supply Circuit |
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LX0 ~ |
LED Driver |
Keyboard |
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APO |
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Q301 ~Q304 |
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LX7 |
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Q5 ~Q8 |
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D334, D335 |
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LY0 ~ |
LED Driver |
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LY7 |
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Q1 ~Q4 |
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DC+9V IN |
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Q307 |
PG |
Reset IC |
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APO Cancellation |
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Signal |
X1, Q11 |
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IC1 |
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FILTER BLOCK
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
Amp. |
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Filter Block |
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CPU |
IC301 |
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Q305/Q306 |
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LSI1 |
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POWER AMPLIFIER (IC301: LA4598)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC301.
Pin No. |
Terminal |
In/Out |
Function |
1 |
Power GND |
In |
Ground (0V) source |
2 |
Ch1 B.S. |
— |
Terminal for a bootstrap capacitor |
3 |
Ch1 OUT |
Out |
Channel 1 output |
4 |
VCC |
In |
+9V source |
5 |
Ch1 N.F. |
In |
Negative feedback input |
6 |
Ch1 IN |
In |
Channel 1 input |
7 |
D.C. |
— |
Terminal for a decoupling capacitor |
8 |
Pre GND |
In |
Ground (0V) source |
9 |
Stand by |
In |
Power control signal input. 0 V: Off, +9 V: On |
10 |
Ch2 IN |
In |
Channel 2 input |
11 |
Ch2 N.F. |
In |
Negative feedback input |
12 |
Ch2 OUT |
Out |
Channel 2 output |
13 |
Ch2 B.S. |
— |
Terminal for a bootstrap capacitor |
14 |
NC |
— |
Not used |
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LED DRIVING
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7-segment LED |
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Keyboard LEDs |
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LVDD |
La ~ Lg |
LED |
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LX0 ~ LX7 |
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Latch |
MD0 ~ MD3 |
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IC3 |
CPU |
Q5 ~ Q8 |
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(Segment) |
MWEB |
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LSI1 |
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LED |
MSM6755B-07 |
LY0 ~ LY7 |
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MD4 ~ MD7 |
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Latch |
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Q1 ~ Q4 |
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MA0 |
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Q2 ~ Q4 |
IC2 |
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(Common) |
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LG |
— 5 —
CIRCUIT DESCRIPTION
KEY MATRIX
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KI0 |
KI1 |
KI2 |
KI3 |
KI4 |
KI5 |
KI6 |
KI7 |
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KO0 |
C2 |
G#2 |
E3 |
C4 |
G#4 |
E5 |
C6 |
G#6 |
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KO1 |
C#2 |
A2 |
F3 |
C#4 |
A4 |
F5 |
C#6 |
A6 |
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KO2 |
D2 |
A#2 |
F#3 |
D4 |
A#4 |
F#5 |
D6 |
A#6 |
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KO3 |
D#2 |
B2 |
G3 |
D#4 |
B4 |
G5 |
D#6 |
B6 |
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KO4 |
E2 |
C3 |
G#3 |
E4 |
C5 |
G#5 |
E6 |
C7 |
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KO5 |
F2 |
C#3 |
A3 |
F4 |
C#5 |
A5 |
F6 |
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KO6 |
F#2 |
D3 |
A#3 |
F#4 |
D5 |
A#5 |
F#6 |
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KO7 |
G2 |
D#3 |
B3 |
G4 |
D#5 |
B5 |
G6 |
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KO8 |
0 |
1 |
2 |
3 |
4 |
Start/ |
Up |
Volume |
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Stop |
Down |
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KO9 |
5 |
6 |
7 |
8 |
9 |
Down |
Volume |
Synchro/ |
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Down |
Fill-In |
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K10 |
Tone |
Rhythm |
Song |
Part |
One Key |
One Key |
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Demo |
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Bank |
Select |
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K11 |
Step-1 |
Step-2 |
Step-3 |
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Fingered |
Casio |
Normal |
Off |
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Chord |
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LED MATRIX
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LX0 |
LX1 |
LX2 |
LX3 |
LX4 |
LX5 |
LX6 |
LX7 |
LY0 |
D4 |
D3 |
C3 |
C2 |
G#2 |
F#2 |
D#2 |
C#2 |
LY1 |
C4 |
E3 |
B2 |
D2 |
A#2 |
C#3 |
D#3 |
F#3 |
LY2 |
B3 |
F3 |
A2 |
E2 |
D#4 |
C#4 |
A#3 |
G#3 |
LY3 |
A3 |
G3 |
G2 |
F2 |
F#4 |
G#4 |
A#4 |
C#5 |
LY4 |
E4 |
E5 |
F5 |
F6 |
G6 |
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LY5 |
F4 |
D5 |
G5 |
E6 |
A6 |
G#5 |
F#5 |
D#5 |
LY6 |
G4 |
C5 |
A5 |
D6 |
B6 |
A#5 |
C#6 |
D#6 |
LY7 |
A4 |
B4 |
B5 |
C6 |
C7 |
A#6 |
G#6 |
F#6 |
NOMENCLATURE OF KEYS
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 |
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 |
— 3 —
CPU (LSI1: MSM6755B-07)
The CPU reads sound data from the ROM in accordance with the pressed key and the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then it provides the left and the right channels' waveforms separately, by converting the data into the waveforms with two built-in DACs. The CPU also controls key input, button input and LED driving. The following table shows the pin functions of LSI1.
Pin No. |
Terminal |
In/Out |
Function |
1 |
MA14 |
Out |
Address bus |
2 |
MWEB |
Out |
Clock for LED latches |
3 |
NCO |
— |
Not used. |
4 ~ 19 |
MA0 ~ MA13 |
Out |
Address bus |
13 |
MRDB |
Out |
Read enable signal |
17 |
MCSB |
— |
Not used. |
20 ~ 27 |
MD0 ~ MD7 |
In/Out |
Data bus |
28, 29 |
NC1, NC2 |
— |
Not used. |
30 |
DGND |
In |
Ground (0 V) source |
31 |
DVCC |
In |
+5 V source |
32, 33 |
XTLO, XTLI |
In/Out |
20 MHz clock input/output |
34 |
NC3 |
— |
Not used. Connected to ground. |
35 |
RSTB |
In |
Reset signal input |
36 |
P24/RXD |
— |
Not used. Connected to +5 V. |
37 |
P25/TXD |
— |
Not used. |
38 |
NMI |
In |
Power ON signal input |
39 |
APO |
Out |
APO (Auto Power Off) signal output |
40 |
NC4 |
— |
Not used. |
41 |
REFH |
Out |
Terminal for the internal DAC |
42, 43 |
NC5, NC6 |
— |
Not used. |
44 |
DAOR |
Out |
Right channel sound waveform output |
45 |
NC7 |
— |
Not used. |
46 |
AVdac |
In |
+5 V source for the internal DAC and ADC |
47 |
DAOL |
Out |
Left channel sound waveform output |
48 |
REFL |
Out |
Terminal for the internal DAC and ADC |
49 |
AGdac |
In |
Ground source for the internal DAC |
50 |
AGadc |
In |
Ground source for the internal ADC |
51 |
ANI |
— |
Not used. Connected to ground. |
52 |
AVadc |
In |
+5 V source for the internal ADC |
53 |
NC8 |
— |
Not used. |
54 |
MOD0 |
In |
Mode selection terminal. Connected to +5 V. |
55, 56 |
MOD1, MOD2 |
In |
Mode selection terminal. Connected to ground. |
57 |
P40 |
In |
APO cancellation signal |
58 ~ 65 |
KI0/P30 ~ KI7/P37 |
In |
Terminals for key/button input signal |
66 ~ 73 |
KO0/P50 ~ KO7/P57 |
Out |
Terminals for key scan signal |
74 ~ 77 |
KO8/P20 ~ KO11/P23 |
Out |
Terminals for button input signal |
78 |
NC9 |
— |
Not used. |
79 |
LVCC |
In |
+5 V source |
80 ~ 95 LX0 ~ LX7, LY0 ~ LY7 |
Out |
LED drive signal |
|
96 |
LGND |
In |
Ground source |
97, 98 |
MA18, MA17 |
— |
Not used. |
99, 100 |
MA16, MA15 |
Out |
Address bus |
— 4 —
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