Casio CTK-500 User manual

(with price)

CTK-500

ELECTRONIC KEYBOARD

CTK-500

- 2 -

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

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

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

Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

PCB Views and Major Check Points . . . . . . . . . . . . . . . . . . . . . . . . 8

Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

IC and Transistor Lead Identification . . . . . . . . . . . . . . . . . . . . . 12

Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

CONTENTS

— 1 —

General

Number of Keys: 61

Polyphonic: 16-note

Preset Tones: 120

Auto-Rhythms: 40

Auto-Accompaniment: CASIO Chord/Fingered

Jukebox Tunes: 40

Chord Memory: Real-Time Recording

Memory Capacity: 128 chords (maximum)

Built-In Speakers: 12 cm dia. 1.1W Input Rating: 2 pcs.

Terminals: Output Jack [Output Impedance: 50 Ω, Output Voltage: 1.4 V (rms)MAX],

AC Adapter Jack (DC 9 V)

Auto Power Off: Approximately 6 minutes after the last operation

Power Source: 2-way AC or DC source

AC: AC adapter

DC: 6 D size dry batteries

Power Consumption: 6.7 W

Dimentions: 110 x 939 x 337 mm (HWD)

(4-5/16 x 36-15/16 x 13-1/4 inches) (HWD)

Weight: 4.5 kg (9.9 lbs) excluding batteries

Electrical

Current Drain with 9V DC:

No Sound Output 125 mA ±30%

Maximum Volume 530 mA ±30%

with keys C4 to D#5 pressed in Clarinet tone,

Volume; Maximum, Rhythm; Samba,

Tempo; Maximum

Output Level (Vrms with 8 Ωload each channel): 107 mV ±30%

with key C4 pressed in Clarinet tone,

Volume; Maximum

Sound Pressure Level: 107 dB ±10 dB

at 10 cm away from the speaker with key G6

in Brass-1 tone

Minimum Operating Voltage: 6.0 V

SPECIFICATIONS

— 2 —

LEDs

LED Driver

IC3

KO0 ~ KO5, KO17

A0 ~ A16

D0 ~ D15

43.45 MHz Clock

Keys and Switches

KO0 ~ KO16

KI1 ~ KI7

CPU

MSM6626-01

LSI1 ROM

MN232000CUQ

LSI2

ROUT

LOUT

Reset IC

S8053ANO

IC4

KO18

(APO)

VCCAVDDVDD

Power Amp.

LA4127

IC2

Output

Power IC

CA5668

IC1

Filter (R)

Filter (L)

Speakers

Main Volume

Control

BLOCK DIAGRAM

— 3 —

CIRCUIT DESCRIPTION

Key and Switch Matrix

KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7

KO0 C2 C#2 D2 D#2 E2 F2

KO1 F#2 G2 G#2 A2 A#2 B2

KO2 C3 C#3 D3 D#3 E3 F3

KO3 F#3 G3 G#3 A3 A#3 B3

KO4 C4 C#4 D4 D#4 E4 F4

KO5 F#4 G4 G#4 A4 A#4 B4

KO6 C5 C#5 D5 D#5 E5 F5

KO7 F#5 G5 G#5 A5 A#5 B5

KO8 C6 C#6 D6 D#6 E6 F6

KO9 F#6 G6 G#6 A6 A#6 B6

KO10 C7 Tempo

Up Tempo

Down

KO11 Power

Off Normal Fingered CASIO

Chord

KO12 Accomp.

Volume 1

(Min)

Accomp.

Volume 2 Accomp.

Volume 3 Accomp.

Volume 4

Accomp.

Volume 5

(Max)

KO13 Reverb Off Reverb 1 Reverb 2

KO14 Synchro

/ Fill-In Start/Stop Intro/

Ending

Chord

Memory

Record

Chord

Memory

Play

Ad-Lib

Musician Jukebox

Start/Stop Beat

(Jukebox)

KO15 Bank A Bank B Bank C Bank D Bank E Bank F Bank G Bank H

KO16 Number 1 Number 2 Number 3 Number 4 Number 5 Solo

Sound Duo

Sound Ensenble

Sound

— 4 —

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

CPU (LSI1: MSM6626-01)

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 keys, switches, and LEDs.

The following table shows the pin functions of LSI1.

Pin No. Terminal In/Out Function

1 ~ 10

74 ~ 80 KO0 ~ KO16 Out Using time sharing, the terminals provide key and switch

scan signals, and LED drive signals.

11 KO17 Out Clock output for the LED driver

12 KO18 (APO) Out APO (Auto Power Off) signal output.

13 KO20 Out Not used.

14 ~ 21 KI0 ~ KI7 In Input terminals from the keys and switches

22 -MI In Power ON trigger pulse input.

23 -RESET In CPU reset signal input.

24 REFH In Low level reference voltage input for the built-in DAC

25 AVDD In +5 V source for the built-in DAC

26 ROUT Out Right channel sound signal output

27 LOUT Out Left channel sound signal output

28 AGND In Ground (0 V) source for the built-in DAC

29 REFL In High level reference voltage for the built-in DAC

30, 31 TEST1, TEST2 Not used. Connected to ground.

32 GND In Ground (0 V) source

33, 34 COSI, COSO In/Out 43.45 MHz clock input/output

35 VDD In +5 V DC source. Regardless of the power switch position,

the terminal always receives +5 V DC.

36 -CE Out Chip enable signal output. Low effective.

37 -OE Out Read enable signal output. Low effective.

38 ~ 40 ADR17 ~ ADR19 Out Not used.

41 ~ 57 ADR0 ~ ADR16 Out Address bus for the ROM

58 ~ 73 DIN0 ~ DIN15 In Data bus for the ROM

Nomenclature of Keys

— 5 —

From the CPU

To main volume

FIlter Block

Since the sound signall from the CPU is a stepped waveform, the filter block is added to smooth the

waveform. VDD

AG AG AG

10K 10K 6.2K

C562(H)

C222(H)

C331J

2SC3112B

VDD

CPU

MSM6626-01

LSI1

VDD

OFF

KO11

KI1

KI0

Power Switch

KO18

APO signal

OFF: 0V

ON: +5 V

Power On/Off Circuit

When the power switch is turned on, a low level differential pulse is provided to terminal MI of the CPU.

Upon receipt of the pulse, the CPU starts the power ON sequence and raises the APO signal to +5 V.

When the switch is off, on receiving the KO11 signal at terminal KI0, the CPU drops the APO signal to

ground level to shut down power.

Initial Reset Circuit

When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU.

The CPU then initializes its internal circuit.

VDD Battery set

RESET

CPU

MSM6626-01

LSI1

Reset IC

S8053ANO

IC4

— 6 —

Power IC (IC1: CA5668)

The power IC generates three voltages AVDD (+5 V) for the CPU and the reset IC, AVDD (+5 V) for the

analog circuit, and VCC (+9 V) for the power amplifier. VDD (+5 V) is always generated, but AVDD (+5 V)

and VCC (+ 9V) are controlled by the APO signal.

KO0

KO1

KO2

KO3

KO4

KO5

KO17

CPU

MSM6626-01

LSI1

LED Driver

TC74CH174AP

IC3

Chord Memory Play

Solo Sound

Duo Sound

Ensenble Sound

Beat (Jukebox)

Ad-Lib Musician

VDD

CLK

CLR

LED Driving

VDD

AVDD

VCC

APO

VIN

VDIN

GND

CA5668

IC1

+9V

APO VDD AVDD VCC

0 V +5 V 0 V 0 V

+5 V +5 V +5 V +9 V

— 7 —

MAJOR WAVEFORMS

— 8 —

789

11 12

13 4

PCB VIEWS AND MAJOR CHECK POINTS

Volume PCB M5505-MA2M

Main PCB M5505-MA1M

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