Casio CTK-500 Service Manual
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Casio CTK-500 Service Manual

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CTK-500
CTK-500
ELECTRONIC KEYBOARD

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Summary of Contents for Casio CTK-500

  • Page 1 (with price) CTK-500 CTK-500 ELECTRONIC KEYBOARD...

  • Page 2: Table Of Contents

    CONTENTS Specifications ......... . 1 Block Diagram .

  • Page 3: Specifications

    SPECIFICATIONS General Number of Keys: Polyphonic: 16-note Preset Tones: Auto-Rhythms: Auto-Accompaniment: CASIO Chord/Fingered Jukebox Tunes: 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 , Output Voltage: 1.4 V (rms)MAX],...

  • Page 4: Block Diagram

    BLOCK DIAGRAM LEDs LED Driver Keys and Switches Output KI1 ~ KI7 KO0 ~ KO16 Main Volume Control KO0 ~ KO5, KO17 ROUT Filter (R) Power Amp. LA4127 LOUT Filter (L) MSM6626-01 A0 ~ A16 LSI1 MN232000CUQ Speakers LSI2 KO18 D0 ~ D15 AVDD 43.45 MHz Clock...

  • Page 5: Circuit Description

    CIRCUIT DESCRIPTION Key and Switch Matrix Tempo Tempo KO10 Down Power CASIO KO11 Normal Fingered Chord Accomp. Accomp. Accomp. Accomp. Accomp. KO12 Volume 1 Volume 5 Volume 2 Volume 3 Volume 4 (Min) (Max) KO13 Reverb Off Reverb 1 Reverb 2...
  • Page 6 Nomenclature of Keys F#3 G#3 A#3 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 C#4 D#4 G2 A2 C2 D2 C3 D3 G3 A3 B3 C4 D4 E4 B4 C5 D5 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.
  • Page 7 FIlter Block Since the sound signall from the CPU is a stepped waveform, the filter block is added to smooth the waveform. 2SC3112B 6.2K From the CPU C562(H) To main volume 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.
  • Page 8 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.

  • Page 9: Major Waveforms

    MAJOR WAVEFORMS — 7 —...

  • Page 10: Pcb Views And Major Check Points

    PCB VIEWS AND MAJOR CHECK POINTS Volume PCB M5505-MA2M Main PCB M5505-MA1M — 8 —...

  • Page 11: Schematic Diagrams

    SCHEMATIC DIAGRAMS M5505-MA1M,MA2M PCB — 9 —...
  • Page 12 Keyboard PCBs M619K-KY1M,KY2M PCB-M619K-KY1M PCB-M619K-KY2M — 10 —...

  • Page 13: Troubleshooting

    TROUBLESHOOTING Nature of Trouble Faulty Block Checkpoint No power Power Jack (J1) Jack contact. Power IC (IC1: CA5668) Pin 8 should have +5 V. Pin 6 should provide + 5V when pin 10 receives + 5 V. Pin 1 should provide a low level pulse when Reset IC (IC4: S8053ANO) an AC adapter is connected.

  • Page 14: Ic And Transistor Lead Identification

    IC AND TRANSISTOR LEAD IDENTIFICATION LSI1: MSM6626-01 DIN8 ADR17 DIN7 ADR18 DIN6 ADR19 DIN5 DIN4 DIN3 DIN2 COSO DIN1 COSI DIN0 TEST1 TEST2 REFL AGND LOUT ROUT AVDD LSI2: MN232000CUQ — 12 —...
  • Page 15 IC2: LA4127 IC1: CA5668 IC3: TC74HC174AP IC4: S8053ANO T5, T6: 2SC3112B — 13 —...

  • Page 16: Exploded View

    EXPLODED VIEW — 14 —...

  • Page 17: Parts List

    PARTS LIST CTK-500 Notes: 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 separately. 3. The numbers in item column correspond to the same...
  • Page 18 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price PCB Ass'y M5505-MA1M 2011 2912 LSI MN232000CUQ 2011 4109 LSI MSM6626-01GS-K-108 1,010 2105 1071 IC TC74HC174AP 2105 2219 IC S-8053ANO 2114 0070 IC LA4127 2114 1239 IC CA5668 2252 0721 Transistor 2SC3113B-TPE4-T 2 10 2360 1939 Zener diode...
  • Page 19 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price 3719 2317 Ribbon cable M237S DF0H02110-35358035 1 10 3719 3584 Ribbon cable M505C (4-pin) DF5H04135-MM 1 10 3719 3591 Ribbon cable M505D DF5H02290-MM 1 10 3719 3598 Ribbon cable M505L DF5H02160-35358035 1 10 3841 0959 Inductor...
  • Page 20 FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price Accessory 6916 7880 Music stand M310827-1 Notes: N – New parts M – Minimum order/supply quantity R – Rank — 17 —...
  • Page 21 MA0300941A...

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