Casio AP-21 Manual do Utilizador Página 1

ELECTRONIC KEYBOARDAP-20(with price)

— 10 —CIRCUIT DESCRIPTIONKEYMATRIXKC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7FI0 A0 1 A0 # 1 B0 1 C1 1 C1 # 1 D1 1 D1 # 1 E1 1SI0 A0 2 A0 # 2 B0 2 C1

— 11 —KI0 KI1 KI2 KI3KO0 Piano2 E. Piano Harpsichord W. BassKO1 Piano1 Strings Choir E. BassKO2 Vibraphone Pipe organ ReverbKO3 Song A Song B Record S

— 12 —MAJOR WAVEFORMSCH1 .2V CH2 .2V˜˜A 1msCH1CH2121 Filter output L-ch CC connector pin 12 Filter output R-ch CC connector pin 26 Button scan signal

— 13 —Check fuse F101.Is F101 blown up?Check fuses F2, F3, and F4.Are the fuses blown up?Are the voltages 40 V ACand 8 V AC?Is it OK?Is it OK?Measure

— 14 —Does the power indicator light up?Check the main volume.Is it OK?Does the demo tune sound?Replace keyboard PCBs.Disconnect JA and JB connectors

— 15 —4. Certain keys do not function5. A certain key does not functionClean the contact.Does the key function?Does the key function?YesNoNoReplace th

— 16 —Replace the console PCBs.Does the button function?YesNoReplace MA1M PCB.End6. A certain button does not function

— 17 —JCM433-MA1MKC4KC3KC2KC1KC0SI4FI4SI3FI3SI2FI2SI1FI1SI0FI0SI10FI10SI9FI9SI8FI8SI7FI7SI6FI6SI5FI5KC7KC6KC5JA-1JA-2JA-3JA-4JA-5JA-6JA-7JA-8JA-9JA-10

— 18 —EXPLODED VIEWSTANDx12x4x4x4x1x2x4x4R-8 R-9R-10R-11R-12WX

— 19 —30123456789R-2R-5R-3R-6R-4R-7R-11011 1314151612171817181920212524262627293122232832

— 2 —CONTENTSSafety Notice ... 2Specifications ...

Notes: This parts list does not include the cosmetic parts, whichparts are marked with item No. "R-X" in the explodedview.Contact our spare

FOB JapanN Item Code No. Parts Name Specification Q N.R.Yen R Unit PriceMain PCB2200 4409 Transistor 2SA933-SQ-TP-T 3 8 B2220 1387 Transistor

FOB JapanN Item Code No. Parts Name Specification Q N.R.Yen R Unit PriceOther electrical parts63012 0567 Transformer TE-351-1M1 1 2,040 B7

— 23 —345SCHEMATIC DIAGRAMSMAIN PCB JCM433-MA1M (1/2)DSPCPUROM(1M)RAM(256K)Reset ICKey ControllerRAM(256K)RAM(256K)ROM (16M)ROM (8M)D/A ConverterD/A C

— 24 —12MAIN PCB JCM433-MA1M (2/2), PHONE JACK PCBs JCM433-MA4M, MA5M and POWER PCBs JCM433-PS140V AC40V AC8V AC8V ACPower CircuitPower Amp.Filter

— 25 —768CONSOLE PCBs JCM433-CN1M, 2M, 3M, and JACK PCB JCM433-MA2MSwitch & LED Controller

— 26 —INTERFACE PCB JCM433-IF1M

— 27 —KEYBOARD PCB TP8/10 KY-1

— 28 —KEYBOARD PCB TP8/10 KY-2

MA0100661A

— 3 —SPECIFICATIONSGENERALNumber of keys 88Polyphonic: 32-notePreset tones: 10, PIANO 1, PIANO 2, ELEC. PIANO, HARPSICHORD, VIBRAPHONE,PIPE ORGAN, STR

— 4 —DSPHG51B155FDRAM256KHM62256BLP-10 ROM1MMX23C1010PC- 12CA25CPUHD6435328RC13FPEDALMIDIIN OUTROM8M + 16MHN62418PD25HN624

— 5 —POWERVOLUMEMIN MAXHALL 2BRILLIANCEMELLOW BRIGHTCONTROLPIANO 1TONEPIANO 2 E.PIANO HARPSICHORD PIPE ORGAN STRINGS CHOIRVIBRAPHONE W.BASS E.BASSLOWE

— 6 —DISASSEMBLY INSTRUCTIONS1. Disassembling top board1-1. Remove 8 screws on the rear.1-2. Slide the top board towards the rear.The top board will b

— 7 —3. Disassembling console panelNote: To avoid scratch on the side board, put paper between theconsole panel and the side board at both ends.3-1. T

— 8 —5. Disassembling keyboard unit5-1. Remove 6 screws at both ends on the bottom, and a screw at the middle.5-2. Remove 2 screws at both ends of key

— 9 —7. Disassembling keyboard PCBs7-1. Turn round the keyboard unit to face the PCBup.7-2. Disconnect the connector at the middle ofkeyboard.7-3. Rem