Casio CTK-520L User manual

ELECTRONIC KEYBOARD
CTK-520L
CTK-520L
TONE RHYTHM SONG
POWER/MODE
FINGERED
CASIO CHORD
NORMAL
ON
OFF
VOLUME SYNCHRO/
FILL-INSTART/ STOP TEMPO
¢
⁄
¢
⁄ TRANSPOSE/TUNE
0
5
1
6
2
7
3
8
4
9
TONE
RHYTHM
SONG
BANK
PART
SELECT
PIANO
00 PIANO 1
01 PIANO 2
02 HONKY-TONK
03 STUDIO PIANO
04 ELEC PIANO 1
05 ELEC PIANO 2
06 ELEC PIANO 3
07 ELEC PIANO 4
08 HARPSICHORD
09 CLAVELECTRO
ORGAN
10 ELEC ORGAN 1
11 ELEC ORGAN 2
12 ELEC ORGAN 3
13 ELEC ORGAN 4
14 CHURCH ORGAN
15 PIPE ORGAN
16 REED ORGAN
17 ACCORDION
18 BANDONEON
19 HARMONICA
GUITAR/BASS
20 GUT GUITAR
21 ACOUS GUITAR
22 JAZZ GUITAR
23 ELEC GUITAR
24 MUTE GUITAR
25 DIST GUITAR
26 WOOD BASS
27 ELEC BASS
28 SLAP BASS
29 BANJO
STRINGS/ENSEMBLE
30 VIOLIN
31 CELLO
32 HARP
33 STRINGS 1
34 STRINGS 2
35 STRINGS 3
36 SYNTH-STR 1
37 SYNTH-STR 2
38 CHOIR
39 VOICE
BRASS
40 TRUMPET
41 TUBA
42 BRASS SECTION
43 FRENCH HORN 1
44 FRENCH HORN 2
45 BRASS 1
46 BRASS 2
47 SYNTH-BRASS 1
48 SYNTH-BRASS 2
49 SYNTH-BRASS 3
REED/PIPE
50 SOPRANO SAX
51 ALTO SAX
52 TENOR SAX
53 OBOE
54 CLARINET
55 PICCOLO
56 FLUTE
57 RECORDER
58 FLUTE ENSEMBLE
59 WHISTLE
SYNTH-SOUND 1
60 SYNTH-LEAD 1
61 SYNTH-LEAD 2
62 SYNTH-LEAD 3
63 SYNTH-CALLIOPE
64 SYNTH-PAD 1
65 SYNTH-PAD 2
66 SYNTH-PAD 3
67 GLESS HARMONICA
68 COUNTRY FARM
69 SYNTH-BASS
SYNTH-SOUND 2
70 PEARL DROP
71 COSMIC SOUND
72 SOUNDTRACK
73 SPACE PAD
74 SYNTH-SFX
75 SE 1 (VEHICLE)
76 SE 2 (TELEPHONE)
77 SE 3 (SPACE)
78 SE 4 (INVADER)
79 SE 5 (FUNNY)
LAYER
80 STRINGS PIANO
81 STRINGS EP
82 CHOIR EP
83 CHOIR ORGAN
84 STRINGS GUITAR
85 STRINGS HARP
86 BRASS STRINGS
87 VIB PAD
88 12STR GUITAR
89 CHOIR STRINGS
SPLIT/PERCUSSION
90 BASS/PIANO
91 BASS/E.PIANO
92 BASS/VIB
93 BASS/G.GUITAR
94 BASS/D.GUITAR
95 STRINGS/PIANO
96 STRINGS/TRUMPET
97 VIBRAPHONE
98 MARIMBA
99 PERCUSSION
100 TONES
3-STEP LESSON
ONE KEY PLAY
STEP 1 STEP 2 STEP3 DEMO
POPS
00 POP FUSION
01 BALLAD
02 POP BALLAD
03 RAP POP
04 SOUL BALLAD
05 FUNKY POP
06 16BEAT
07 8BEAT 1
08 8BEAT 2
09 POPS
ROCK
10 ROCK WALTZ
11 SLOW ROCK
12 SOFT ROCK 1
13 SOFT ROCK 2
14 FOLKIE POP
15 60’s SOUL
16 ROCK
17 HEAVY METAL
18 50’s ROCK
19 CHICAGO BLUES
JAZZ/DANCE
20 BIG BAND
21 SLOW SWING
22 FOX TROT
23 JAZZ WALTZ
24 ACID JAZZ
25 LATIN FUSION
26 TRANCE
27 DISCO
28 RAP
29 FUNK
EUROPEAN/LATIN
30 POLKA
31 MARCH
32 SLOW WALTZ
33 WALTZ
34 TANGO
35 BOSSA NOVA
36 SAMBA
37 MAMBO
38 RHUMBA
39 CHA-CHA-CHA
VARIOUS
40 MERENGUE
41 REGGAE
42 SKA
43 TEX-MEX
44 FOLKLORE
45 COUNTRY
46 SLOW GOSPEL
47 ADANI
48 BAROQUE
49 ENKA
01 TWINKLE TWINKLE
LITTLE STAR
02 ACH DU LIEBER AUGUSTIN
03 AMAZING GRACE
04 ODE TO JOY
05 LONDON BRIDGE
06 LONDONDERRY AIR
07 GREENSLEEVES
08 AULD LANG SYNE
00 WHEN YOU WISH
UPON A STAR
11 OVER THE RAINBOW
12 O CHRISTMAS TREE
13 YANKEE DOODLE
14 SANTA LUCIA
15 WHEN THE SAINTS
GO MARCHING IN
16 ALOHA OE
17
09
JOY TO THE WORLD
10 JINGL BELLS
SPRING FROM
"THE FOUR SEASONS"
20 IMAGINE
21
22
LITTLE BROWN JUG
23 MARCH FROM
"THE NUTCRACKER"
24 THE ENTERTAINER
25
18
STAND BY ME
19 YOU CAN’T HURRY LOVE
SERENADE
"EINE KLEINE NACHTMUSIK"
I JUST CALLED TO
SAY I LOVE YOU
28 FROM THE NEW WORLD
29
31
CANON(PACHELBEL)
32 SILENT NIGHT
34
THE ENTERTAINER
35
26
THE GIRL FROM IPANEMA
27 LOVE STORY
ETUDE op.10, no.3
"CHANSON DE L’ ADIEU"
MISTY
30 MINUET(J.S.BACH)
33 CLAIR DE LUNE
38
36
MOON RIVER
37 FUR ELISE
39 INVENTION no.1
TURKISH MARCH
(RONDO ALLA TURCA)
40 SONG BANK50 RHYTHMS

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: 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
AC Adapter Jack (9 V) , Stereo standard Jack [Output impedance: 50 Ω, Output
voltage: 2 V(rms) MAX]
Auto power off: Approximately 6 minutes after the last operation
Power source: 2-way AC or DC source
AC: AC adapter
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:
No sound output 130 mA ±20%
Maximum volume 810 mA ±20%
with white keys C1 to G2 pressed in Synth-Lead 1
Volume: Maximum
Phone output level (Vrms with 8 ohm load each channel):
with key D3 pressed in Synth-Lead 1 95 mV ±20%
Speaker output level (Vrms with 4 ohm load each channel):
with key D3 pressed in Synth-Lead 1 1050 mV ±20%
Minimum operating voltage: 6.3 V

— 2 —
Buttons
Illuminant
Keyboard
7 seg. LED
LED Latch IC2, IC3
Q5 ~Q8 Q1 ~Q4
PG
X1, Q11 Reset IC
IC1
Q307
Power Supply Circuit
Q301 ~Q304
D334, D335
Amp.
IC301
LA4598
Filter (L)
Q306
Filter (R)
Q305
Phone/Output
DC+9V IN APO Cancellation
Signal
APO
MA0
~
MA16 MD0 ~MD7
Sound Source ROM
LSI2
MX23C1010MC-12CA45
KO8 ~KO11
LY0 ~
LY7
KO0 ~KO7
LX0 ~
LX7
KI0 ~KI7
CPU
LSI1
MSM 6755B-07
LED Driver LED Driver
BLOCK DIAGRAM

— 5 —
Amp.
IC301 Filter Block Q305/Q306 CPU LSI1
FILTER BLOCK
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
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
LED DRIVING
LG
LVDD
CPU

LSI1

MSM6755B-07
LX0 ~ LX7
LY0 ~ LY7 Q1 ~ Q4
Q5 ~ Q8
Q2 ~ Q4
La ~ Lg
(Common)
(Segment) MWEB
LED
Latch
IC3
7-segment LED Keyboard LEDs
LED
Latch
IC2
MD0 ~ MD3
MD4 ~ MD7
MA0

— 3 —
CIRCUIT DESCRIPTION
KEY MATRIX
KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7
KO0 C2 G#2 E3 C4 G#4 E5 C6 G#6
KO1 C#2 A2 F3 C#4 A4 F5 C#6 A6
KO2 D2 A#2 F#3 D4 A#4 F#5 D6 A#6
KO3 D#2 B2 G3 D#4 B4 G5 D#6 B6
KO4 E2 C3 G#3 E4 C5 G#5 E6 C7
KO5 F2 C#3 A3 F4 C#5 A5 F6
KO6 F#2 D3 A#3 F#4 D5 A#5 F#6
KO7 G2 D#3 B3 G4 D#5 B5 G6
KO8 01234
Start/
Stop Up Volume Down
KO9 5 6 7 8 9 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
LED MATRIX
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
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
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
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6
D#3
C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 B6A6G6F6E6D6 C7
C#3A#2G#2
F#2D#2
C#2 A#6 G#6F#6D#6
C#6

— 4 —
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
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.

— 5 —
Amp.
IC301 Filter Block Q305/Q306 CPU LSI1
FILTER BLOCK
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.
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
LED DRIVING
LG
LVDD
CPU

LSI1

MSM6755B-07
LX0 ~ LX7
LY0 ~ LY7 Q1 ~ Q4
Q5 ~ Q8
Q2 ~ Q4
La ~ Lg
(Common)
(Segment) MWEB
LED
Latch
IC3
7-segment LED Keyboard LEDs
LED
Latch
IC2
MD0 ~ MD3
MD4 ~ MD7
MA0

— 6 —
1
2
4
5
3
6
7
1APO signal
MSM6755B-07 pin 39
2Reset signal
RH5VL40AA pin 1
4Sound signal (R-ch)
JH connector pin 3
5Sound signal (L-ch)
JH connector pin 1
6LED drive signal LX0
MSM6755B-07 pin 88
3Clock
MSM6755B-07 pin 32
7LED drive signal LY0
MSM6755B-07 pin 80
Tone: Whistle (59)
Key : A4 Key: D4
MAJOR WAVEFORMS

— 7 —
PRINTED CIRCUIT BOARDS
Sub PCB KDM446-MA2M
Top view
Main PCB JCM446-MA1M
Bottom view Top view
245
1
3
6
7

— 8 —
SCHEMATIC DIAGRAMS
Main PCB JCM446-MA1M
5
1
6
7
23
4

— 9 —
Sub PCB KDM446-MA2M

— 10 —
Keyboard PCBs KDM6111K-KY1M/KY2M

— 11 —
LED PCB KDM446-LD1M

— 12 —
LED PCB KDM446-LD2M

— 13 —
LED PCBs KDM446-LD3M/LD4M/LD5M
KDM446-LD5M KDM446-LD4M KDM446-LD3M

1
23
8
9
5
10
6
7
4
11
12
13
13
14
15
16
17
18
19
20
21
22
R-1
R-3
R-4
R-5
R-2
R-6
R-7
R-7
EXPLODED VIEW
— 14 —

Notes: This parts list does not include the cosmetic parts, which
parts are marked with item No. "R-X" in the exploded
view.
Contact our spare parts department if you need these
parts for refurbish.
1. Prices and specifications are subject to change with-
out prior notice.
2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
seperately.
3. The numbers in item column correspond to the same
numbers in drawing.
PARTS LIST
CTK-520L

Item Code No. Parts Name Specification Q R
Main PCB
1 6925 1290 Main PCB ass'y M240438*1 1 B
LSI1 2012 3430 LSI, CPU MSM6755B-07 1 A
LSI2 2012 3843 LSI, ROM MX23C1010MC-12CA45 1 A
IC1 2105 5922 IC RH5VL40AA-T1 1 A
IC2 2105 4452 IC HD74HC174FPTR 1 A
IC3 2105 5796 IC HD74HC4511FPTR 1 A
Q1 - Q4 2259 2555 Transistor, Chip, Digital UMW1NTL 4 A
Q5 - Q8 2259 2562 Transistor, Chip, Digital UMS1NTL 4 A
Q9 2259 2646 Transistor, Chip, Digital UMH3NTN 1 A
Q10 2259 2548 Transistor, Chip, Digital DTC143EUAT106 1 A
Q11 2252 1239 Transistor, Chip 2SC4081-T106Q 1 A
D1 2390 2576 Diode, Chip, Schottky RB501V-40TE-17 1B
D3 2390 1820 Diode, Chip 1SS355TE-17 1B
X1 2590 1526 Oscillator, Ceramic EFO-EN2005C4 1 B
LED1 2370 1141 LED, 7-seg. SL-9352-60 1 B
Sub PCB
26925 1300 Sub PCB ass'y M140411*1 1B
IC301 2114 2891 IC, Power amp. LA4598 1 A
Q301 2251 0469 Transistor 2SB1237Q,R-TV6-T 1 A
Q302, Q305, 2220 1387 Transistor 2SC1740SQ-TP-T 3A
Q306
Q304 2253 0455 Transistor 2SD1762E,F 1 A
Q307 2200 2449 Transistor 2SA933SQ-TP-T 1 A
D301, D302, 2390 1344 Diode 1SS133T-77-T 30 B
D305~D330,
D332, D335
D304 2360 1729 Diode, Zener MTZJ5.1A-T77-T 1B
D331, D333 2390 2408 Diode 1FWJ43N(TPA3) 2 B
D334, D336 2360 2002 Diode MTZJ5.6B-T77-T 2B
LED301 2370 1106 LED MPR3338S-B99 1C
J301 3501 7049 Jack HEC2305-01-330 1B
J302 3612 0665 Jack YKB21-5006 1B
LED PCBs
3 6925 1320 LED PCB ass'y LD1M M240426*1 1 C
4 6925 1330 LED PCB ass'y LD2M M240427*1 1 C
5 6925 1340 LED PCB ass'y LD3M M240428*1 1 C
6 6925 1350 LED PCB ass'y LD4M M240429*1 1 C
7 6925 1360 LED PCB ass'y LD5M M240430*1 1 C
2370 1330 LED KR3302X-J345K 61 B
Keyboard PCB
8 6925 1310 Keyboard PCB ass'y M140402*2 1 B
D701~D725, 2301 0101 Diode 1S2473-T-77-T 61 C
D731~D766 Mechanical Parts
9 6925 1640 Rubber button M240413-1 1B
10 6925 1650 Rubber button M240414-1 1B
11 6925 1660 Rubber button M240374-1 1B
12 6909 5890 Slide contact CSB-12D 1B
13 3831 1043 Speaker S10JA13B 2B
14 6921 5030 Slide knob M311859-1 1B
15 6925 1550 Display plate M340415-1 1C
16 6925 1700 White key set, LSK-CB M340489*1 4 A
17 6925 1710 White key set, LSK-CS M340489*2 1 A
18 6925 1720 Black key set, LSK-10P M140369-1 2 A
Notes: Q – Quantity used per unit
R – Rank — 15 —

Item Code No. Parts Name Specification Q R
19 6925 1730 Black key set, LSK-5P M140369-2 1 A
20 6922 3990 Key contact rubber M111764-1 1A
21 6922 4000 Key contact rubber M111765-1 1A
22 6925 2160 Battery cover M340490*1 1 B
Accessory
6916 7880 Music stand M310827-1 1C
Notes: Q – Quantity used per unit
R – Rank — 16 —