Casio CTK-501 User Manual

ELECTRONIC KEYBOARDCTK-501CTK-501100 SONG BANNK100 TONES100 RHYTHMSPOWER/MODE MAIN VOLUME TEMPOMUSICAL INFORMATION SYSTEMTONERHYTHMSONG BANKSTATUSTEMP

— 8 —MAJOR WAVEFORMS1 Clock pulseMSM6755B-17 pin 3212 Power source DVDDJC connector pin 83 APO signalJC connector pin 2234 Sound waveform (R-ch) Tone:

— 9 —PRINTED CIRCUIT BOARDSMain PCB JCM443-MA1MTop ViewBottom View521348967

— 11 —SCHEMATIC DIAGRAMSMain PCB JCM443-MA1M176234598

— 12 —Sub PCB JCM443-MA2M

— 13 —Console PCBs JCM443-CN1M/CN2M

— 14 —Keyboard PCBs JCM6112K-KY1M/KY2M

— 15 —LCDCommonSegmentCOM7COM6COM5COM4COM3COM2COM1SEG1SEG2SEG3SEG4SEG5SEG6SEG7SEG8SEG9SEG10SEG21SEG22SEG23SEG24SEG25SEG26SEG27SEG28SEG29SEG30SEG31SEG3

— 16 —EXPLODED VIEW1313161718192021152223R-1R-224316587914101211R-3

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 PCB1 6926 0460 PCB/ASS'Y (MA1M) M240626*1 1 BLSI1 2012 5638 LSI/MASK-ROM LC372100PM-G48TE-L 1 ALSI

CONTENTSSpecifications ...

Item Code No. Parts Name Specification Q RAccessory6926 1541 STAND/NOTE M340701A*1 1B Notes: Q – Quantity per unitR – Rank— 18 —

MA0600571A

— 1 —ELECTRICALCurrent drain with 9 V DC:No sound output 120 mA ± 20%Maximum volume 750 mA ± 20%with 12 keys C1 to B1 pressed in Synth-Lead 1Volume: M

— 2 —BLOCK DIAGRAMCPUMSM 6755B-17LSI2KeyboardButtonsLCDLCD DriverSED1278F0ALSI3Reset ICIC1OscillatorX1, Q1Power Supply CircuitQ201 ~ Q203, Q208, D205

— 3 —CIRCUIT DESCRIPTIONKEY MATRIXF#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 B5C6D#3C2 D2E2F2G2A2

— 4 —CPU (LSI2: 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

— 5 —LCD DRIVER (LSI3: SED1278F0A)The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. The LSI contains 240graphic symbols

— 6 —FILTER BLOCKSince the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.POWER AMPLIFIER (IC201:

— 7 —OutputSet VoltmeterR623) Equipment connection/ProcedureVop voltage settingInputConnectionInputPointInputSignalAdjustOutputConnectionOutputPointAd