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Casio CTK-480 Service Manual

Casio CTK-480 Service Manual

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CTK-480
100 TONES
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CASIO CHORD
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STOP
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TONE RHYTHM
SONG
5
6
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RHYTHM
TRANSPOSE/TUNE
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'''
49
MELODY
ON/OFF
CTK-480

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Summary of Contents for Casio CTK-480

  • Page 1 CTK-480 100 TONES 50 RHYTHMS 20 SONG BANK XgOX VZTEh |bvX »… AClENClEingEW[N GNgbNIK |bvt[W rbNoh ««fl KbgM^[ gybg \vmTbNX VZ[h AvXŒ GNgbNIK AR[XeBbNM^[ ‘F ‘[o AgTbNX VZ[h X[bN X[XCO }[‘ '¢¢I[KX‘ GNgbNIK |bvo[h \tgbN tHbNXgbg ACWOEOCX T^E‘A zL[gN WYM^[...
  • Page 2: Table Of Contents

    CONTENTS Specifications .......................... 2 Block Diagram ......................... 3 Circuit Description ........................4 Troubleshooting ........................7 Major Waveforms ........................8 Schematic Diagrams ....................... 9 Printed Circuit Boards ......................11 Exploded View ........................13 Parts List ..........................15 SPECIFICATIONS GENERAL Number of keys: Polyphonic: 12-note Preset tones:...
  • Page 3: Block Diagram

    BLOCK DIAGRAM Buttons La ~ Lg, Output KO8 ~ KI0 ~ KI7 CC1 ~ CC3 KO11 Filter (L) Q109 Power Amp. LA4598 Keyboard IC101 Filter (R) Q110 MSM 6755B-06 VCC AVDD DVDD LVDD LSI101 Power Supply Circuit KO0 ~ KO7 Q101 ~ Q104, D108, D109 DC+9V IN Q105...
  • Page 4: Circuit Description

    CIRCUIT DESCRIPTION KEY MATRIX Tempo Volume Start/Stop Tempo Volume Synchro/ Down Down Fill-In Song Melody Tone Rhythm Bank On/Off CONCERT Fingered Normal Power Off Chord 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 G2 A2 C2 D2 C3 D3...
  • Page 5 CPU (LSI101: MSM6755B-06) The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides left and right channel sound waveforms in accordance with the pressed key and the selected tone. The following table shows the pin functions of LSI101. Pin No.
  • Page 6 POWER AMPLIFIER (IC101: LA4598) The power amplifier is a two-channel amplifier with standby switch. The following table shows the pin function of IC101. Pin No. Terminal In/Out Function Power GND Ground (0V) source Ch1 B.S. — Terminal for a bootstrap capacitor Ch1 OUT Channel 1 output +9V source...
  • Page 7: Troubleshooting

    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. Battery Set Reset IC MSM 6755B-06 RE5VA35A LSI101 IC102 RESET TROUBLESHOOTING Nature of Trouble Faulty Block...
  • Page 8: Major Waveforms

    MAJOR WAVEFORMS 20 µs 0.1 s 1 RESET signal 2 Main clock pulse IC102 pin 1 MSM6755B-06 pin 32 10 µs 3 Key scan signal KO10 5 Sound signal output (L-ch) MSM6755B-06 pin 76 MSM6755B-06 pin 47 4 Key scan signal KO11 6 Sound signal output (L-ch) MSM6755B-06 pin 77 Q109 2SC1740SQ Emitter...
  • Page 9: Schematic Diagrams

    SCHEMATIC DIAGRAMS Main PCB KDM440-MA1M Notes: µF) 1. All capacitance values are indicated in "µF" (p=10 Ω, M=10 Ω). 2. All resistance values are indicated in "Ω" (k=10 — 9 —...
  • Page 10 Keyboard PCBs KDM6111K-KY1M/KY2M Notes: µF) 1. All capacitance values are indicated in "µF" (p=10 Ω, M=10 Ω). 2. All resistance values are indicated in "Ω" (k=10 — 10 —...
  • Page 11: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS Main PCB KDM440-MA1M Top View Console PCB KDM6111K-KY1M Top View Console PCB KDM6111K-KY2M Top View — 11 —...
  • Page 12 Main PCB KDM440-MA1M Bottom View Console PCB KDM6111K-KY1M Bottom View Console PCB KDM6111K-KY2M Bottom View — 12 —...
  • Page 13: Exploded View

    EXPLODED VIEW — 13 —...
  • Page 14: Parts List

    PARTS LIST CTK-480 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. Prices and specifications are subject to change with- out prior notice.
  • Page 15: Specifications

    FOB Japan Item Code No. Parts Name Specification N.R.Yen Unit Price MAIN PCB ASSEMBLY IC101 2114 2891 Monolithic IC LA4598 IC102 2105 5922 IC RE5VL40AA-TZ LSI101 2012 3486 LSI, CPU MSM6755B-06 Q101 2251 0469 Transistor 2SB1237Q Q102 2220 1387 Transistor 2SC1740Q Q103/104 2253 0448 Transistor...
  • Page 16 MA0600761A...

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