Casio CTK-480 User Manual

ELECTRIONIC KEYBOARDCTK-480CTK-4800516273849MULTI FUNCTION DISPLAYPOWER/MODEFINGEREDCASIO CHORDNORMALONOFFVOLUMESYNCHRO/FILL-INSTART/STOPTEMPO⁄¢

— 10 —Keyboard PCBs KDM6111K-KY1M/KY2MNotes:1. All capacitance values are indicated in "µF" (p=10-6 µF)2. All resistance values are indicate

— 11 —9657 1081234PRINTED CIRCUIT BOARDSMain PCB KDM440-MA1MTop ViewConsole PCB KDM6111K-KY1MTop ViewConsole PCB KDM6111K-KY2MTop View

— 12 —Main PCB KDM440-MA1MBottom ViewConsole PCB KDM6111K-KY1MBottom ViewBottom ViewConsole PCB KDM6111K-KY2M

8910114217641615161315121453R-1 R-2 R-3 R-4R-5 EXPLODED VIEW— 13 —

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 PCB ASSEMBLYIC1012114 2891 Monolithic IC LA4598 1AIC1022105 5922 IC

MA0600761A

— 2 —CONTENTSSpecifications ...

— 3 —CPUMSM 6755B-06LSI101KeyboardButtonsLEDReset ICIC102OscillatorX101, Q111Q105Power Supply CircuitQ101 ~ Q104, D108, D109Power Amp.LA4598IC101Fil

— 4 —CIRCUIT DESCRIPTIONKEY MATRIXKI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7KO0 C1 G#1 E2 C3 G#3 E4 C5 G#5KO1 C#1 A1 F2 C#3 A3 F4 C#5 A5KO2 D1 A#1 F#2 D3 A#3 F#4

— 5 —++AVDDAGAG AG AG AG16 V 10 µ2SC1740SQ10 K1010 K 10 KC332(H)33 KC152 (H)C221B (A)10 V 22 µ2.2 KTo main volumeFrom the CPUCPU (LSI101: MSM675

— 6 —POWER AMPLIFIER (IC101: LA4598)The power amplifier is a two-channel amplifier with standby switch.The following table shows the pin function of I

— 7 —INITIAL RESET CIRCUITWhen batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU.The CPU then initializes

— 8 —0.1 sCH1CH1 5VBWL20 µsCH1BWLCH1 1V10 µsCH1CH2CH2BWLCH1 5V 5V1msCH2CH1BWLCH1 1V 1VCH21msCH1CH2BWLCH1 1VCH2 1V1msCH1CH2BWLCH1 1V 1VCH21 RESET signa

— 9 —SCHEMATIC DIAGRAMSMain PCB KDM440-MA1M10968753421Notes:1. All capacitance values are indicated in "µF" (p=10-6 µF)2. All resistance val