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Casio LD-50 Service Manual
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Casio LD-50 Service Manual

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LD-50
AUG. 2001
LD-50
ELECTRONIC DRUM

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Summary of Contents for Casio LD-50

  • Page 1 LD-50 AUG. 2001 LD-50 ELECTRONIC DRUM...

  • Page 2: Table Of Contents

    CONTENTS Page SPECIFICATIONS ............................ 1 BLOCK DIAGRAM ............................ 2 CIRCUIT DESCRIPTION .......................... 3 TROUBLE SHOOTING ..........................8 PCB LAYOUT ............................9 EXPLODED DRAWING .......................... 14 PARTS LIST ............................15 SCHEMATIC DIAGRAM ......................... 17 SPECIFICATIONS GENERAL Percussion Pads: 4 (with touch response) Lighting Guide System: Lesson, Dual Light, Synchro Sounds:...

  • Page 3: Block Diagram

    com1~com16 LCD Driver S6A0069 SEG1~SEG40 6IC 1 Audiobus A0~A18 MIDI LSI MIDI PCM 1717 1R2~1R7 1R25 SAM9793 MIDI Rom D0~D7 reset Mclk 1IC112 1IC1 1C22~1C26 HE80M04 1IC5 oscillator oscillator P87C52 key0~key3 Audio ch1 xtral2 12MHZ xtral1 9.6MHZ 1IC4 Keyboard sel0~sel4 74HC374 D.LE.clk sound effect...

  • Page 4: Circuit Description

    CIRCUIT DESCRIPTION Power Amplifier (LA4550) The power amplifier is a two channel amplifier which connected in BTL mode. The following table shows the pin function of the LSI. Pin. No. Terminal In/Out Function Not used OUT2 Channel 2 Output Terminal for a bootstrap capacitor Negative feedback input Channel 2 Input Terminal for a decoupling capacitor...
  • Page 5 LCD DRIVER (S6A0069) 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.
  • Page 6 Sound Engine (Dream SAM9773) The sound engine read MIDI message from the MCU and convert them into digital audio data to the external DAC of sound drum output. The following table shows the pin function of the LSI. Pin. No. Terminal In/Out Function...
  • Page 7 MCU (87C58UBA) The MCU controls all key and button output, sound output, LCD display. It read data from the external ROM when a drum pad is hit and the selected tone; the MCU can read rhythm data simultaneously when a rhythm pattern is selected.
  • Page 8 Sound Effect Chip (HE80085) The Sound effect chip read sound data from the built-in ROM in accordance with the pressed SE key (or hitting the drum pad) and the selected tone. Then it provide the sound waveforms to the Power amp. For sound output, by converting the data into waveforms with the built-in DACs and Op-Amp.

  • Page 9: Trouble Shooting

    TROUBLE SHOOTING Nature of Trouble Faulty Block Cause/Remedy No Power Power supply circuit Faulty 3IC2, 3IC4.Replace 3IC2, 3IC4 Faulty 3T4. Replace 3T4. Faulty 3D1~3. Replace 3D1~3. Power switch Poor contact. Clean the contacts. Power (DC in) jack Open or poor soldering. Replace the jack or resolder.

  • Page 10: Pcb Layout

    PCB LAYOUT DIGITAL PCB Top View Bottom View — 9 —...
  • Page 11 POWER/AMP PCB Top View — 10 —...
  • Page 12 JACK/SW PCB Top View — 11 —...
  • Page 13 — 12 —...
  • Page 14 LED PCB Top View — 13 —...

  • Page 15: Exploded Drawing

    EXPLODED DRAWING — 14 —...

  • Page 16: Parts List

    PARTS LIST LD-50 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 17 PARTS PRICE LIST LD-50 Item Code No. Part Name Specification Price Code 10076480 CABINET/UPPER 8CA-130-05002000 10076481 PAD ASSY/DRUM 8CA-130-05001000 10076482 LENS/DRUM PAD ##073-05003000 10076483 SPACER/A/DRUM LENS ##073-05007000 10076484 REFLECTOR ##073-05004000 10076485 RETAINER/REFLECTOR ##073-05005000 10076486 CAP/POWER SWITCH ##073-05013000 10076487 PCB ASSY/JACK...

  • Page 18: Schematic Diagram

    SCHEMATIC DIAGRAM DIGITAL PCB — 17 —...
  • Page 20 Power/Amp PCB — 19 —...
  • Page 21 LCD PCB — 20 —...
  • Page 22 LED/SENSOR PCB — 21 —...
  • Page 23 JACK/SWITCH PCB — 22 —...
  • Page 24 CASIO TECHNO CO.,LTD. Overseas Service Division Nishi-Shinjuku Kimuraya Bldg. 1F 5-25, Nishi-Shinjuku 7-Chome Shinjuku-ku, Tokyo 160-0023, Japan...