Casio ap-21 Service Manual
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Casio ap-21 Service Manual

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See also: User Manual
AP-21
MAY 1999
AP-21
ELECTRONIC KEYBOARD
INDEX
Ver. 1
SEP. / 2002

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  • Page 1 AP-21 MAY 1999 AP-21 ELECTRONIC KEYBOARD INDEX Ver. 1 SEP. / 2002...

  • Page 2: Table Of Contents

    CONTENTS Safety Notice ..................1 Specifications ..................2 Block Diagram ................... 3 PCB Layout ..................4 Disassembly Instructions ..............5 Circuit Description ................8 Major Waveforms ................10 Troubleshooting ................11 Wiring Diagram ................14 Exploded View ................. 15 Parts List ..................16 Schematic Diagrams ...............

  • Page 3: Specifications

    F# - C - F A4 = 440Hz ± 50 cents Tuning control: Demonstration tunes: 1: Polonais "Héroïque" (F.F. Chopin) 5: CASIO original 2: Frühlingslied Op. 62-6 (F. Mendelssohn) 6: jesus, Bleibet Meine Freude (J.S. Bach) 3: CASIO original 7: CASIO original 4: Harmonious blacksmith (G.F.

  • Page 4: Block Diagram

    BLOCK DIAGRAM MIDI OUT IN THROUGH Sound Source Rom (3M-bit) LSI 6 MX23C2410MC-12CA58 Pedal Keyboard unit Mute signal FI0~FI10 KC0~ SI0~SI10 SOLP P10, P12~P16, Key touch LSI SOLM P93, P94, P97 LSI 10 HG52E35P P70~P77 LSI-S Power LSI4,5 MIXER IC 408 Main LSI 1 LSI 7...

  • Page 5: Pcb Layout

    PCB LAYOUT MA1M PS12 PS2M PS3M VOLUME TRANSPOSE/ DIGITAL TONE MEMORY DEMO CN2M CN1M TUNE/MIDI EFFECT CHORUS REVERB SONG A START/ AP-21 REVERB2 HARPSI- PIPE STOP PIANO E.PIANO STRINGS SONG B RECORD CHORD ORGAN REVERB1 POWER KY1M KY2M KY3M PS4M...

  • Page 6: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. Removal of top board 1-1. Remove 6 screws affixing the top board on the back. 1-2. Slide the top board forward and remove it from the main unit. 2. Removal of keyboard cover 2-1. Lift up the keyboard cover full open position. 2-2.
  • Page 7 3. Removal of console panel 3-1. Remove screws affixing both ends of the console panel. 3-2. Disconnect connector CD on PCB MA1M, connector CF on PCB PS2M, and transformer grounding wire. 3-3. Lift the console panel and turn it over and remove the power switch, which is affixed by 2 screws. Then remove the side panel.
  • Page 8 6. Removal of keys 6-1. While plying the side partition plastics with tweezers, lift the edge of the key toward front. 7. Removal of keyboard PCB 7-1. Lay the keyboard so that keyboard PCBs face upward. 7-2. Remove screws on keyboard PCBs (10 screws on PCBs KY1M and KY3M, 12 screws on KY2M).

  • Page 9: Circuit Description

    CIRCUIT DESCRIPTION KEYMATRIX Second contact First contact HG52E35P A0 1 A0 # 1 B0 1 C1 1 C1 # 1 D1 1 D1 # 1 E1 1 A0 2 A0 # 2 B0 2 C1 2 C1 # 2 D1 2 D1 # 2 E1 2 F1 1...
  • Page 10 POWER SUPPLY CIRCUIT The power supply circuit generates five voltages as shown in the following table. Name Voltage For operation of +5 V CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM, Key touch LSI, Gute array, LEDs AVDD +5 V AVCC...

  • Page 11: Major Waveforms

    MAJOR WAVEFORMS A 20 µs A 1ms ˜ ˜ ˜ CH1 5V CH2 5V CH3 5V CH1 .2V CH2 .2V 1 Filter output L-ch 3 Key scan signal KC0 CF connector pin 2 CA connector pin 20 2 Filter output R-ch 4 Key scan signal KC1 CF connector pin 1 CA connector pin 19...

  • Page 12: Troubleshooting

    TROUBLESHOOTING No power Check fuse F401. Is F401 blown up? Replace F401. Check fuses F402, F403, and F404. Are the fuses blown up? Replace F402, F403, and F404. Measure output voltages of the transformer. Are the voltages 21.6 V AC and 8.4 V AC? Replace main PCB.
  • Page 13 No sound Does the power indicator light up? Follow "No power" troubleshooting. Check the main volume. Is it OK? Replace main volume. Disconnect CA connectors on the main PCB. Press Demo button. Does the demo tune sound? Replace the main PCB. Replace keyboard PCBs.
  • Page 14 Certain keys do not function Replace MA1M PCB. Do the keys function? Replace keyboard PCBs. A certain key does not function Clean the contact. Does the key function? Replace the key contact rubber. Does the key function? Replace keyboard PCBs. A certain button does not function Replace CN1M PCB.

  • Page 15: Wiring Diagram

    WIRING DIAGRAM PHONES POWER LAMP SPEAKERS LEFT JCM425-PS3M RIGHT JCM425-PS4M JCM425-CN1M JCM431-PS12 RmelI ( BROWN ) LmelI ( RED ) JCM425-PS2M ( BLACK ) Lmel0 ( ORANGE ) Rmel0 ( YELLOW ) TRANSFORMER POWER SWITCH CD-1 CD-1 CD-2 CD-2 CD-3 NRES CD-3 CD-4...

  • Page 16: Exploded View

    EXPLODED VIEW R-11 × 4 × 2 × 4 × 8 × 1 × 4 × 2 × 2 R-10...

  • Page 17: Parts List

    PARTS LIST AP-21 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 18 PARTS PRICE LIST AP-21 Item Code No. Part Name Specification Price Code Remarks Main PCB 3815 0794 BATTERY / LITHIUM CR2032/1VC1 D1 - D4 2390 2576 DIODE / SCHOTTKY RB501V-40TE-17 2390 2576 DIODE / SCHOTTKY RB501V-40TE-17 2360 3057 DIODE / ZENER UDZTE-173.3B...
  • Page 19 Item Code No. Part Name Specification Price Code Remarks PS12,PS3,PS4M PCB's F401 3632 0294 FUSE / UL TIME-LAG MT4-2A-N1 For 110 - 127V area F401 3631 1037 FUSE / TIME-LAG (S)T-1A For 220 - 240V area J406 - J407 3502 2657 JACK / PHONE YKB22-5006 L401...

  • Page 20: Schematic Diagrams

    SCHEMATIC DIAGRAMS MAIN PCB JCM425-MA1M — 19 —...
  • Page 21 MAIN (B) & POWER SUPPLY PCBs JCM425-PS12/PS2M/PS3M/PS4M (AC : 220 - 240V AREA) — 20 —...
  • Page 22 MAIN (B) & POWER SUPPLY PCBs JCM425-PS12/PS2M/PS3M/PS4M (AC: 110 - 127V AREA) — 21 —...
  • Page 23 CONSOLE PCB JCM425-CN1M, CN2M — 22 —...
  • Page 24 KEYBOARD PCB JCM887T-KT1M — 23 —...
  • Page 25 KEYBOARD PCB JCM887T-KT2M — 24 —...
  • Page 26 KEYBOARD PCB JCM887T-KT3M — 25 —...
  • Page 27 Ver. 1 : Correction of page 18. CASIO TECHNO CO.,LTD. Overseas Service Division Nishi-Shinjuku Kimuraya Bldg. 1F 5-25, Nishi-Shinjuku 7-Chome Shinjuku-ku, Tokyo 160-0023, Japan...

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