Casio AP-40 Service Manual
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Casio AP-40 Service Manual

88 piano keys
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Table of Contents

See also: User Manual
AP-40
AUG. 2000
AP-40
DIGITAL PIANO
INDEX
Ver.1 Oct. / 2000

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Summary of Contents for Casio AP-40

  • Page 1 AP-40 AUG. 2000 AP-40 DIGITAL PIANO INDEX Ver.1 Oct. / 2000...

  • Page 2: Table Of Contents

    CONTENTS Page Specifications ................................1 Block Diagram ................................. 2 PCB Layout ................................3 Disassembly Instructions ............................4 Circuit Description ..............................8 Major Waveforms ..............................10 Printed Circuit Board ............................. 11 Troubleshooting ..............................12 Wiring Diagram ..............................16 Exploded View ..............................17 Parts List ................................

  • Page 3: Specifications

    SPECIFICATIONS GENERAL Keyboard: 88 piano keys (with touch response) Polyphonic: 32 notes, maximum Tones: • 10 (including two bass tones) • Tuning Curves: 3 (preset for each tone) • Layer: Adjustable volume • Split: Split point, adjustable volume Digital Effects: Reverb (4 types), Chorus, Tremolo, Brilliance Demo Tunes: •...

  • Page 4: Block Diagram

    BLOCK DIAGRAM Keyboard MIDI KC0 ~ 7 P70 ~ Keyboard Controller PEDAL HG52E35P PB4 ~ 6 M-IN M-OUT LSI10 FI0 ~ 10 BRILLIANCE P12 ~ SI0 ~ 10 Buttons L18 ~ 28 HD6435328RF35F A0 ~ 19 Switch & LED Controller KI0 ~ 3 LSI1 uPD65005GF-419...

  • Page 5: Pcb Layout

    PCB LAYOUT PS2M MA1M PS11 PS3M CN1M CN2M BRILLIANCE PIANO 1 PIANO 2 E.PIANO HARPSICHORD W. BASS TRACK RECORD POWER ROOM MELLOW BRIGHT STAGE LIGHT TONE LOWER TONE SONG LESSON/MEMORY HALL 1 CHORUS MIDDLE VALUE MALTI FUNCTION DISPLAY CONTROL HALL2 TREMOLO HEAVY TRANSPOSE...

  • Page 6: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS 1. Disassembling top board 1-1. Remove 8 screws on the rear. 1-2. Slide the top board towards the rear. The top board will be free from catches on the case. 1-3. Lift the top board. 2. Disassembling keyboard cover 2-1.
  • Page 7 3. Disassembling console panel Note: To avoid scratch on the side board, put paper between the console panel and the side board at both ends. Insert paper here. Insert paper here. 3-1. Remove three screws afixing the console panel. 3-2. Remove the screw fixing a grounding wire at the transformer. 3-3.
  • Page 8 4. Disassembling front cover 4-1. Remove 9 screws at the front edge on the bottom. 4-2. Unscrew 2 screws and remove JCM434-PS4M 5. Removal of keyboard unit 5-1. Disconnect connector CA on the PCB MA1M. 5-2. Remove 24 screws that affix the keyboard unit Front cover screws (16 on the bottom of the case and 8 on the keyboard unit).
  • Page 9 6. Removal of keys 6-1. While plying the side partition plastics with tweezers, push the edge of the key toward front. 7. Disassembling keyboard PCBs 7-1. Turn round the keyboard unit to face the PCB up. 7-2. Disconnect the connector at the middle of keyboard. 7-3.

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION KEYMATRIX Second contact First contact HG52E35P A0 # C1 # D1 # A0 # C1 # D1 # F1 # G1 # A1 # F1 # G1 # A1 # C2 # 1 D2 # F2 # G2 # C2 # D2 # F2 #...
  • Page 11 BUTTON MATRIX STEP BY STEP PART L PART R NEXT TOUCH SELECT TRACK A TRACK B PLAY/STOP TEMPO/BEAT/FIXED METRONOME PIANO 2 E. PIANO HARPSICHORD W.BASS PIANO 1 STRINGS CHOIR E.BASS VIBRAPHONE PIPEORGAN CHORUS/TREMOLO REVERB SONG SELECT RECORD VALUE DOWN VALUE UP DEMO POWER SUPPLY CIRCUIT The power supply circuit generates four voltages as shown in the following table.

  • Page 12: Major Waveforms

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

  • Page 13: Printed Circuit Board

    PRINTED CIRCUIT BOARD JCM435-MAIN Top View Bottom View — 11 —...

  • Page 14: Troubleshooting

    TROUBLESHOOTING No power Check fuse F101. Is F101 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 40 V AC and 8 V AC? Replace main PCB.
  • Page 15 No sound Does the power indicator light up? Follow "No power" troubleshooting. Check the main volume. Is it OK? Replace main volume. Disconnect CA and CB connectors on the main PCB. Press Demo button. Does the demo tune sound? Replace the main PCB. Replace keyboard PCBs.
  • Page 16 Certain keys do not function Replace the main 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. Does the key function? Replace the main PCB.
  • Page 17 A certain button does not function Replace the console PCBs. Does the button function? Replace MA1M PCB. A certain tone is strange when record/playback Check the cord of pedal unit Is it disconnected? Connect the cord Replace the main PCB. —...

  • Page 18: Wiring Diagram

    WIRING DIAGRAM JCM434-PS11 POWER Lamp PHONE POWER AC PLUG Switch JCM434-PS3M CH-1 CH-1 CH-2 CH-2 JCM434-PS4M LINE IN LINE OUT MIDI CF-1 R-mel IN CF-2 L-mel IN CF-3 CF-4 L-mel OUT R-mel OUT CF-5 JCM434-PS2M POWER TRANSFORMER LK14 JK-1 JK-1 LK13 JK-2 JK-2...

  • Page 19: Exploded View

    EXPLODED VIEW CABINET — 17 —...
  • Page 20 STAND — 18 —...

  • Page 21: Parts List

    PARTS LIST AP-40 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 22 PARTS PRICE LIST AP-40 Item Code No. PART NAME Specification Price Code BK BN Main PCB 1003 2486 PCB ASSY/MA1M M241412*1 TK(M435) 3815 0794 BATTERY / LITHIUM CR2032/1VC1 D1-D4 2390 2555 DIODE / SHOTTKY RB500V-40TE-17 2390 2555 DIODE / SHOTTKY...
  • Page 23 Item Code No. PART NAME Specification Price Code BK BN PS11,PS3,PS4 PCBs J406 3613 1533 JACK HLJ4336-01-3040 F401 3632 0720 FUSE / TIME-LAG (For 110 - 127V AREA) MT4-3.15A-N1 F401 3631 1045 FUSE / TIME-LAG (For 220 - 240V AREA) (S)T-1.6A L401 3013 2577...

  • Page 24: Schematic Diagrams

    SCHEMATIC DIAGRAMS Main PCB JCM435-MA1M ROM (8M) RAM (256K) Converter ROM (24M) Converter controller Reset IC (256K) (256K) To Pedal Unit — 22 —...
  • Page 25 I/O PCBs JCM434-PS2M, Phone Jack PCBs JCM434-PS3M, LED PCBs JCM 434-PS4M, Power PCBs JCM 434-PS11 Mute Power Supply circuit Power Amp. Filter Mixer Mute — 23 —...
  • Page 26 Console PCBs JCM434-CN1M Switch & LED Controller — 24 —...
  • Page 27 Console PCBs JCM434-CN2M — 25 —...
  • Page 28 Keyboard PCB JCM887T-KY1M — 26 —...
  • Page 29 Keyboard PCB JCM887T-KY2M — 27 —...
  • Page 30 Keyboard PCB JCM887T-KY3M — 28 —...
  • Page 31 Ver.1 : Correction of page 21, due to parts code misprinted. 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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