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Casio AP-22S Service Manual

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AP-22S
ELECTRONIC KEYBOARD

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  Summary of Contents for Casio AP-22S

  • Page 1 AP-22S ELECTRONIC KEYBOARD...
  • Page 2: Table Of Contents

    CONTENTS Safety Notice ..................2 Specifications ..................4 Block Diagram ................... 5 PCB Layout ..................6 Disassembly Instructions ..............7 Circuit Description ................11 Major Waveforms ................13 Printed Circuit Board ..............14 Troubleshooting ................15 Wiring Diagram ................19 Exploded View .................
  • Page 3 DENMARK: ADVARSE! Lithiumbatteri. Eksplosionsfare ved fejlagtig handtering. Udskiftning ma kun ske med batteri af samme fabrikat og type. Lever det brugte batteri tilbage tili leverandoren. FINLAND: VAROITUS Paristo voiäjähtää, jos se on virheellisesti asennettu. Vaihda paristo ainoastaan valmistajan suosittelemaan tyyppiin. Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.
  • Page 4: Specifications

    SPECIFICATIONS GENERAL Keyboard: 88 piano keys (with touch response) Polyphony: 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 5: Block Diagram

    BLOCK DIAGRAM Keyboard MIDI KC0 ~ 7 P70 ~ Keyboard PEDAL Controller M-IN M-OUT HG52E35P PB4 ~ 6 FI0 ~ 10 BRILLIANCE P12 ~ SI0 ~ 10 Buttons L18 ~ 28 A0 ~ 19 HD6435328RF35F Switch & LED KI0 ~ 3 Controller A0 ~ 14 LA ~ LG, LP...
  • Page 6: Pcb Layout

    PCB LAYOUT PS2M MA1M PS11 PS3M CN1M CN2M W. BASS TRACK RECORD BRILLIANCE PIANO 1 PIANO 1 PIANO 2 PIANO 2 E.PIANO HARPSICHORD W. BASS TRACK RECORD POWER ROOM ROOM MELLOW MELLOW BRIGHT BRIGHT STAGE STAGE LIGHT TONE LOWER TONE SONG LESSON/MEMORY TONE LOWER TONE...
  • Page 7: 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 8 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 9 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. Disassembling keyboard unit 5-1. Remove 12 screws fixing front end of the keyboard unit and three screws supporting rear end of the keyboard.
  • Page 10 6. Disassembling keys 6-1. Pressing the hook with long-nose pliers, lift the key. 6-2. Using pliers, remove key spring. 7. Disassembling keyboard PCBs 7-1. Turn round the keyboard unit to face the PCB 7-2. Disconnect the connector at the middle of keyboard.
  • Page 11: Circuit Description

    CIRCUIT DESCRIPTION KEYMATRIX Second contact First contact HG52E35P A0 # C1 # D1 # A0 # C1 # D1 # F1 # G1 # A1 # F1 # G1 # A1 # C2 # D2 # F2 # G2 # C2 # D2 # F2 #...
  • Page 12 BUTTON MATRIX STEP BY STEP PART L PART R NEXT TOUCH SELECT TRACK A TRACK B PLAY/STOP TEMPO/ METRONOME BEAT/FIXED PIANO 2 E. PIANO HARPSICHORD W.BASS PIANO 1 STRINGS CHOIR E.BASS CHORUS/ VIBRAPHONE PIPEORGAN REVERB TREMOLO SONG SELECT RECORD VALUE DOWN VALUE UP DEMO POWER SUPPLY CIRCUIT...
  • Page 13: Major Waveforms

    MAJOR WAVEFORMS A 20 µs A 1ms ˜ ˜ ˜ CH1 .2V CH2 .2V CH1 5V CH2 5V CH3 5V 1 Filter output L-ch CF connector pin 4 3 Key scan signal KC0 CB connector pin 2 2 Filter output R-ch 4 Key scan signal KC1 CF connector pin 5 CB connector pin 4...
  • Page 14: Printed Circuit Board

    PRINTED CIRCUIT BOARD Top View Bottom View — 14 —...
  • Page 15: 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 16 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 17 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 18 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 19: Wiring Diagram

    WIRING DIAGRAM R-mel IN CF-R L-mel IN JCM434-CN2M L-mel OUT R-mel OUT JCM434-CN1M R-mel1 CC-1 CC-1 CA-1 CA-1 R-mel2 CC-2 CC-2 CA-2 CA-2 L-mel1 CC-3 CC-3 CA-3 CA-3 L-mel2 CC-4 CC-4 POWER Lamp CA-4 CA-4 CC-5 CC-5 CA-5 CA-5 AVDD CC-6 CC-6 CA-6...
  • Page 20: Exploded View

    EXPLODED VIEW CABINET — 20 —...
  • Page 21 STAND — 21 —...
  • Page 22: Parts List

    PARTS LIST AP-22S 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 23 Item Code No. Parts Name Specification Main PCB 3815 0794 BATTERY/LITHIUM CR2032/1VC1 D1 - D5 2390 2555 DIODE/SHOTTKY RB500V-40TE-17 2360 3057 DIODE/ZENER UDZTE-173.3B 2105 1120 IC/MOS TC7S08F-TE85R 2105 6354 IC/MOS TC74HC27AF(TP1) 2105 6353 IC/MOS TC74HC11AF(TP1) 2105 6355 IC/MOS TC7S00F(TE85R) 2114 4060 IC MB3771PF-EF LSI1 2012 5844 LSI...
  • Page 24 Item Code No. Part Name Specification 6926 5800 M434-PS2M PCB ASSY M140654*2 (US,CANADA,DIRECT 110 - 127V AREA) M434-PS2M PCB ASSY M140654*3 (EU,DIRECT 220 - 240V AREA) PS11, PS3, PS4 PCBs J406 3613 1533 JACK HLJ4336-01-3040 F401 3632 0720 FUSE/TIME-LAG (US,CANADA) MT4-3.15A-N1 F401 3631 1045 FUSE/TIME-LAG (OTHERS)
  • Page 25: Schematic Diagrams

    SCHEMATIC DIAGRAMS Main PCB JCM434-MA1M Converter ROM (8M) (256K) ROM (24M) Converter controller Reset IC (256K) (256K) To Pedal Unit — 25 —...
  • Page 26 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 — 26 —...
  • Page 27 Console PCBs JCM434-CN1M Switch & LED Controller — 27 —...
  • Page 28 Console PCBs JCM434-CN2M — 28 —...
  • Page 29 Keyboard PCB TP20 KY-1 — 29 —...
  • Page 30 Keyboard PCB TP20 KY-2 — 30 —...
  • Page 32 CASIO TECHNO CO.,LTD. Overseas Service Division 8-11-10, Nishi-Shinjuku Shinjuku-ku, Tokyo 160-0023, Japan...