ELECTRONIC KEYBOARDCTK-485CTK-485MULTI FUNCTION DISPLAYMULTI FUNCTION DISPLAY100 SONG BANK KEYBOARDSONG BANK CONTROLLER⁄POWER/MODEFINGEREDCASIO CHORDN
— 9 —3) Equipment connection/ProcedureADJUSTMENTMAIN PCB1) Items to be adjusted:2) Adjustment and Test Point LocationsItemMeasuring InstrumentVop volt
— 10 —MAJOR WAVEFORMS0.1 sCH1CH1 5VBWL1 RESET signalIC 1 pin 1120 µsCH1BWLCH1 1V22 Main clock pulseMSM6755B-17 pin 3210 µsCH1CH2CH2BWLCH1 5V 5V3 Key s
— 11 —PRINTED CIRCUIT BOARDSMain PCB JCM450-MA1MTop ViewBottom View127534
— 12 —Keyboard PCB KDM6111K-KY1MKeyboard PCB KDM6111K-KY2MMain PCB JCM450-MA2M6 8 9 10
— 13 —SCHEMATIC DIAGRAMSMain PCB JCM450-MA1M127534
— 14 —Main PCB JCM450-MA2M86910(2.9 V)(5.3 V)(0.7 V)
— 15 —Keyboard PCBs KDM6111K-KY1M/KY2MNotes:1. All capacitance values are indicated in "µF" (p=10-6 µF).2. All resistance values are indicat
— 16 —EXPLODED VIEW131498615185124176119101132716R-1R-2R-4R-5R-6R-3R-6R-5
Notes: This parts list does not include the cosmetic parts, whichparts are marked with item No. "R-X" in the explodedview.Contact our spare
Item Code No. Parts Name Specification Q RMain PCB16926 6310 PCB ASSY/M450-MA1M M240821*1 1 B26926 6320 PCB ASSY/M450-MA2M M140731*1 1 BD12390 1820 DI
— 1 —SPECIFICATIONSGENERALModel: CTK-485Keyboard: 61 standard-size keys, 5 octavesTones: 100Polyphony: 12 notes maximum (6 for certain tones)Auto acco
CASIO TECHNO CO.,LTD.Overseas Service Division8-11-10, Nishi-ShinjukuShinjuku-ku, Tokyo 160-0023, Japan
— 2 —ELECTRICALCurrent drain with 9 V DC:No sound output 137 mA ± 20 % Maximum volume 710 mA ± 20 %with white keys C1 to G2 pressed in Synth-Lead
— 3 —BLOCK DIAGRAMCPUMSM 6755B-17LSI1KeyboardButtonsLCDLCD DriverKS0066U-10BLSI3Reset ICIC1PowerSwitchOscillatorX1, Q1Power Supply CircuitQ101 ~ Q104,
— 4 —CIRCUIT DESCRIPTIONKEY MATRIXNOMENCLATURE OF KEYSF#3 G#3A#3 C#4 D#4F#4 G#4A#4C#5D#5F#5 G#5A#5F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B
— 5 —CPU (LSI1: MSM6755B-17)The CPU reads sound data from the ROM in accordance with the pressed key and the selected tone; the CPUcan read rhythm dat
— 6 —LCD DRIVER (LSI3: KS0066U-10B)The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. The LSI contains 240graphic symbol
— 7 —POWER AMPLIFIER (IC101: LA4598)The power amplifier is a two-channel amplifier with standby switch.The following table shows the pin function of I
— 8 —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
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