(without price) CTK-50 CTK-50 INDEX ELECTRIONIC KEYBOARD
CONTENTS Specification .............................................................................. 2 Block Diagram ........................................................................... 3 Circuit Description ..................................................................... 4 Troubleshooting ........................................................................ 7 Major Waveforms ...................................................................... 8 Schematic Diagrams .........................
BLOCK DIAGRAM KO0~KO9 CPU —3— Amplifier A4598 IC101 Main Volume Filter Q201 MSM6387-13 LSI201 KI0~KI7 Speaker Keyboard VC +9 V AVDD +4.
CIRCUIT DESCRIPTION KEY AND SWITCH MATRIX KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7 KO0 (KC1) 0 1 C2 C#2 D2 D#2 E2 F2 KO1 (KC2) 2 3 F#2 G2 G#2 A2 A#2 B2 KO2 (KC3) 4 5 C3 C#3 D3 D#3 E3 F3 KO3 (KC4) 6 7 F#3 G3 G#3 A3 A#3 B3 KO4 (KC5) 8 9 C4 C#4 D4 D#4 E4 F4 KO5 (KC6) Tone Rhythm F#4 G4 G#4 A4 A#4 B4 KO6 (KC7) Tempo Up Tempo Down C5 C#5 D5 D#5 E5 F5 KO7 (KC8) Start/ Stop Fill-In F#5 G5 G#5 A5 A#5 B5 KO8 (KC9) Demo Normal Fingered CASIO C
CPU (LSI201: MSM6387-13) The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides a sound waveform in accordance with the pressed key and the selected tone. The following table shows the pin functions of LSI201. Pin No. Terminal 1, 2 TEST1, TEST2 In/ Out Function Not used. Connected to ground. Power ON reset terminal. When the power switch is 3 RESET In turned on, the terminal receives a low level signal and the internal circuits of the LSI are initialized.
POWER AMPLIFIER (IC101: LA4598) The following table shows the pin functions of IC101. Pin No. Terminal In/Out Functiion 1 Power GND In 2 Ch1 B.S. Out Terminal for a bootstrap capacitor 3 Ch1 OUT Out Channel1 output 4 VCC In +9 V source. Connected to the power source directly. 5 Ch1 N.F. In Negative feedback input 6 Ch1 IN In Channel1 input 7 D.C. Out 8 Pre GND In Ground (0 V) source 9 Standby In Power control signal input.
POWER SUPPLY CIRCUIT The power supply circuit regulates two constant output voltages VDD (+5.0 V) for the CPU and the oscillator, and AVDD (+4.8 V) for the analog circuit. VC (+9 V) Q101 2SD1858Q,R D101 R116 Power Switch AVDD (+4.8 V) Q102 2SC1740SQ D102 MTZ6.2A R114 R101 LED101 D103 OFF R115 C102 ON DC +9 V Input VDD (+5.
MAJOR WAVEFORMS 50 ns 2 ms 2 CH1 3 CH2 1 CH1 ~ CH1: 1V – CH1: 5 V 1 Clock pulse COSI MSM6387-13 pin 8 – CH2: 5 V 2 Key scan signal KO0 MSM6387-13 pin 30 3 Key scan signal KO1 MSM6387-13 pin 29 2 ms 2 ms 4 CH1 5 CH2 6 CH1 7 CH2 ~ ~ CH1: 50 mV CH2: 50 mV ~ ~ CH1: 50 mV CH2: 0.5 V 4 Sound signal output MSM6387-13 pin 5 6 Power amp input LA4598 pin 6 5 Filter output Emitter of Q201 7 Power amp output LA5498 pin 3 Tone : Flute (No.
SCHEMATIC DIAGRAMS Keyboard PCB —9—
Main PCB Notes: 1. All capacitance values are indicated in "µF" (p=10-6 µF). 2. All resistance values are indicated in "Ω" (k=10 3Ω , M=106Ω). 7 6 2.2 5.9 8.9 5.0 4 4.7 1 2.4 5.3 1.8 5 2 3 — 10 — 0.3 0.
PCB VIEW Main PCB 15 D113 C111 R105 C110 JCM509-MA2M B No.2 75 5 — 11 — E C302 R302 C301 B Q301 JCM509 -MA3M B R114 75 C102 5 JA1 75 R115 D114 125 D103 D101 L101 75 R101 5 R104 175 5 5 R110 R112 R109 R111 R113 14 D104 B C109 D102 C112 LED101 D109 75 X301 R301 NO L102 E R106 R102 Q101 75 D112 C108 J101 R108 200 C203 C201 150 C207 D111 B Q102 IC101 C107 R202 5 E 1 R107 C202 100 5 150 C209 C213 C212 R103 D105 D106 D107 D108 E No.
EXPLODED VIEW 5 4 7 6 17-1 17-2 8 9 2 3 17-1 1 17-1 10 11 1-2 1-3 1-1 12 17-4 13 13-1 16 13-2 17-3 15 14 — 12 —
PARTS LIST CTK-50 Notes: 1. Prices and specifications are subject to change without 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.
N Item N 1 D101 D102 D103 D104~D114, D201,D202 FB101 IC101 J101 JA L101,L102 LED101 LSI201 MC201 Q101 Q102,Q201, Q301 X301 1-1 1-2 1-3 1-4 13 D1~D49 13-1 13-2 N N N N N N N N N N N N N N N 2 3 4 5 6 7 8 9 10 11 12 14 15 16 17-1 17-2 17-3 17-4 Code No.
Description of Capacitors A general description of capacitors is shown in the following table. The description consists of Type, Value, Rated Voltage and Tolerance. When you need a capacitor, please find a subsutitution in your country by yourselves referring to the description. Ref. No of Capacitor C101, C209, C211~C215, C217~C219, C222, C223, C301 C102 C106, C112 C107, C108, C110, C111 C109 C201 C202 C203 C206, C207 C216 C302 C303 Description Ceramic, 1.
8-11-10, Nishi-Shinjuku Shinjuku-ku, Tokyo 160, Japan Telephone: 03-3347-4926 Apr, 1995
