Casio CTK-501 User manual

ELECTRONIC KEYBOARD

CTK-501

,,,,,,,,,,,,,,,,,,,,,,,,,,,

100 SONG BANNK100 TONES

100 RHYTHMS

POWER/MODE MAIN VOLUME TEMPO MUSICAL INFORMATION SYSTEM

TONE

RHYTHM

SONG BANK

STATUS

TEMPO

MAIN VOLUME

FINGERING/PART

LEFT/

ACCOMP RIGHT/

MELODY

:1 OCTAVE UP

:PEDAL(SUSTAIN)

100 SONG BANNK KEYBOARD

MUSICAL INFORMATION SYSTEM

OFF

FINGERED

SYNCHRO/

FILL-IN

CHORD BOOK TONE

M7 dim aug

sus4 -5

add9

CLEAR

123

456

789

RHYTHM

STOP

REW

LEFT RIGHT

ON/OFF

PLAY/

PAUSE

SONG BANK

TRANSPOSE/

TUNE/MIDI

ACCOMP

VOLUME

START/

STOP

CASIO CHORD

NORMAL

SONG BANK CONTROLLER

CONTENTS

Specifications................................................................................................................................... 1

Block Diagram.................................................................................................................................. 2

Circuit Description............................................................................................................................ 3

Adjustment ....................................................................................................................................... 7

Major Waveforms ............................................................................................................................. 8

Printed Circuit Boards ...................................................................................................................... 9

Schematic Diagrams ...................................................................................................................... 11

Exploded View ............................................................................................................................... 16

Parts List ........................................................................................................................................ 17

— 1 —

ELECTRICAL

Current drain with 9 V DC:

No sound output 120 mA ±20%

Maximum volume 750 mA ±20%

with 12 keys C1 to B1 pressed in Synth-Lead 1

Volume: Maximum

Phone output level (Vrms with 8 Ωload each channel):

with key G2 pressed in Synth-Lead 1 78 mV ±20%

Speaker output level (Vrms with 4 Ωload each channel):

with key G1 pressed in Synth-Lead 1 1250 mV ±20%

Minimum operating voltage: 6.0 V

SPECIFICATIONS

GENERAL

Keyboard: 61 standard-size keys, 5 octaves

Tones: 100

Polyphony: 12 notes maximum (6 for certain tones)

Auto accompaniment

Rhythm patterns: 100

Tempo: Variable (236 steps, = 20 to 255)

Chords: 2 fingering methods (CASIO CHORD, FINGERED)

Rhythm controller: START/STOP, SYNCHRO/FILL-IN

Accomp volume: 0 to 9 (10 steps)

Song bank

Tunes: 100

Controllers: PLAY/PAUSE, STOP, REW, FF, LEFT (ON/OFF), RIGHT (ON/OFF)

Musical information

Name display: TONE, RHYTHM, SONG BANK name/number

Tempo: Tempo value, metronome, synchro standby, beat indicator

Chord: Chord name, Chord form

Fingering: Fingering indcators, parts, pedal

Song bank status: PLAY, PAUSE, REW, FF

Staff: 5 octaves with sharp and flat indications

Keyboard: 5 octaves

MIDI: 5 multi-timbre receive

Other functions

Transpose: 12 steps (–6 semitones to +5 semitones)

Tuning: Variable (A4 = approximately 440 Hz ±50 cents)

Volume: 0 to 9 (10 steps)

Terminals

MIDI terminals: IN, OUT

Sustain terminal: Standard jack

Phones/Output terminal: Stereo standard jack

Output Impedance: 78 Ω

Output Voltage: 4 V (RMS) MAX

Power supply terminal: 9 V DC

Power supply Dual power supply system

Batteries: Six D-size batteries

Battery life: Approximately 10 hours on manganese batteries

AC adaptor: AD-5

Auto power off: Turns power off approximately six minutes after last key operation. Enabled

under battery power only, can be disabled manually.

Speaker output: 2.0 W + 2.0 W

Power consumption: 9 V --- 7.7 W

Dimensions (HWD): 961 ×381 ×139 mm (37-7/8 ×15-1/16 ×5-1/2 inches)

Weight: Approximately 5.4 kg (11.91 lbs) (without batteries)

— 2 —

BLOCK DIAGRAM

CPU

MSM 6755B-17

LSI2

Keyboard

Buttons

LCD LCD Driver

SED1278F0A

LSI3

Reset IC

IC1 Oscillator

X1, Q1

Power Supply Circuit

Q201 ~ Q203, Q208, D205

Power Amp.

TA8248K

IC201

Filter (L)

Q206

Filter (R)

Q205

Output

VC VCC DVDD

APO

DC + 9V IN

DB4 ~ DB7

MIDI IN

MIDI OUT

COM1 ~ COM16

SEG1 ~ SEG40

R/W

EKO8 ~

KO12 KI0 ~ KI6

KO0 ~ KO7

MD0 ~ MD7

MA0 ~ MA18 ROM(2M-bit)

LC372100PM-

G48

LSI1

— 3 —

CIRCUIT DESCRIPTION

KEY MATRIX

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

NOMENCLATURE OF KEYS

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 —+0

KO9 321

KO10 6 5 4 Rhythm Tone

KO11 9 8 7 Fingered Normal Off

KO12 FF Right Stop Left REW

Tempo

Down Tempo

Start/

Stop Synchro/

Fill-In Chord

Book Accomp

Volume

Transpose/

Tune/MIDI

Song

Bank

CASIO

Chord

Play/

Pause

Volume

Down Volume

— 4 —

CPU (LSI2: MSM6755B-17)

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 and button input. The following table shows the pin functions of LSI2.

Pin No. Terminal In/Out Function

1 MA14 Out Address bus

2, 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

35 RSTB In Reset signal input

36 P24/RXD In MIDI signal input

37 P25/TXD Out MIDI signal output

38 NMI In Power ON signal input. Connected to +5 V.

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

47 DAOL Out Left channel sound waveform output

48 REFL Out Terminal for the internal DAC and ADC

49 AGdac In Ground source for internal DAC

50 AGadc In Ground source for internal ADC

51 ANI In APO cancellation signal

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 Pedal signal input

58 ~ 64 KI0/P30 ~ KI7/P36 In Terminals for key/button input signal

65 KI7/P37 — Not used

66 ~ 73 KO0/P50 ~ KO7/P57 Out Terminals for key scan signal

— 5 —

LCD DRIVER (LSI3: SED1278F0A)

The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. The LSI contains 240

graphic symbols in the built-in character generator ROM, and stores 80 characters in the built-in display data

RAM. In accordance with command from the CPU, the LSI is capable of displaying up to 16 characters

simultaneously. The following table shows the pin functions of LSI3.

Pin No. Terminal In/Out Function

74 ~ 77 DB4 ~ DB7 Out Data bus for the LCD driver

78 NC9 — Not used

79 LVCC In +5 V source

80 ~ 84 KO8 ~ KO12 Out Terminals for button scan signal

85 ~ 87 P65 ~ P67 — Not used

88 RS Out Control signal for the LCD driver

89 R/W Out Read/Write signal for the LCD driver

90 E Out Chip enable signal for the LCD driver

91 ~ 95 P73 ~ P77 — Not used

96 LGND In Ground source

97, 100 MA18, MA15 Out Address bus

Pin No. Terminal In/Out Function

1 ~ 22,

63 ~ 80

23 VSS — GND (0 V) source

Terminals for the built-in clock pulse generator. The external

resistor connected determines the oscillation frequency.

LCD drive voltage input.

26 ~ 30 V1 ~ V5 In Those voltages are used for generating the stepped pulse of

the LCD drive signals.

31, 32 LP, XCLS — Not used

33 VDD In DVDD (+5 V) source

34, 35 FR, DO — Not used

Data/command determination terminal.

High: data, Low: command

37 R/W In Read/Write terminal. High: read, Low: write

Chip enable signal.

38 E In High: enable, the writing is done at fall edge.

Low: disenable

39 ~ 42 DB0 ~ DB3 — Not used. Connected to GND (0 V)

43 ~ 46 DB4 ~ DB7 In/Out Data bus

47 ~ 62 COM1 ~ COM16 Out Common signal/output

SEG1 ~ SEG40 Out Segment signal output

24, 25 OSC1, OSC2 In/Out

36 RS In

— 6 —

FILTER BLOCK

Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.

POWER AMPLIFIER (IC201: TA8248K)

The power amplifier is a two-channel amplifier with standby switch.

The following table shows the pin function of IC201.

Pin No. Terminal In/Out Function

1 NC — Not used

2 B.S.2 — Terminal for a bootstrap capacitor

3 OUT2 Out Channel 2 output

4 VCC In +9 V source

5 OUT1 Out Channel 1 output

6 B.S.1 — Terminal for a bootstrap capacitor

7 Power GND In Ground (0 V) source

8 Stand by In Power control signal input. 0 V: Off, +9 V: On

9 DC — Terminal for a decoupling capacitor

10 NF1 In Negative feedback input

11 IN1 In Channel 1 input

12 IN2 In Channel 2 input

13 NF2 In Negative feedback input

14, 15 Pre GND In Ground (0 V) source

Amp.

TA8248K Filter

Block CPU

MSM6755B-17

— 7 —

Output

Set Voltmeter

R62

3) Equipment connection/Procedure

Vop voltage setting

Input

Connection Input

Point Input

Signal Adjust Output

Connection Output

Point Adjust for

VR1 Voltmeter R62 Adjust for 4.4 ±0.1 V reading

on voltmeter.

Makefineadjustmentaccord-

ing to the next instruction.

Watching the LCD at a 37°angle to the horizontal, adjust Vop

voltage so that unenergized segments are seen dimly.

ADJUSTMENT

MAIN PCB

1) Items to be adjusted:

2) Adjustment and Test Point Locations

(TOP VIEW)

Item Measuring Instrument

Vop voltage setting Voltmeter

37°

LCD

Eye

Test point

— 8 —

MAJOR WAVEFORMS

1Clock pulse

MSM6755B-17 pin 32

2Power source DVDD

JC connector pin 8

3APO signal

JC connector pin 2

4Sound waveform (R-ch) Tone: Whistle (59)

JC connector pin 5 Key: A4

5Sound waveform (L-ch) Volume: Max.

JC connector pin 4

6Button scan signal KO0

MSM6755B-17 pin 66

7Button scan signal KO1

MSM6755B-17 pin 67

8LCD common signal COM9

SED1278F0A pin 55

9LCD common signal COM10

SED1278F0A pin 56

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