Casio CTK-625L User Manual

ELECTRONIC KEYBOARDCTK-401CTK-401POWER/MODEFINGEREDMAINVOLUMESYNCHRO/FILL-INSTART/STOP TEMPOCHORD BOOKM0123456789m 7 M7 dimaug sus4 -5 add9 CLEARACCOM

— 8 —MAJOR WAVEFORMS1 Clock pulseMSM6755B-17 pin 3212 +5 V source DVDDJC connector pin 63 APO signalJC connector pin 5234 Sound waveform (R-ch) Tone:

— 9 —PRINTED CIRCUIT BOARDSMain PCB JCM442-MA1MTop ViewBottom View123458967

— 11 —SCHEMATIC DIAGRAMSMain PCB JCM442-MA1M671985432

— 12 —Sub PCB JCM442-MA2M

— 13 —Keyboard PCBs KDM4910K-KY1M/KY2M

— 14 —LCDSegmentCOM7COM6COM5COM4COM3COM2COM1SEG2COM11COM12SEG39SEG40COM10COM9COM14COM15COM16SEG11NCNCNCCOM16SEG3SEG4SEG5SEG6SEG7SEG8SEG9SEG10SEG21SEG2

— 15 —EXPLODED VIEW18141315121119171610R-1R-2R-3568794R-4R-6R-54312

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 0200 PCB/ASS'Y (MA1M) M240592*1 1 BLSI1 2012 5603 LSI/MC (CPU) MSM6755B-17 1 ALSI2 2012

MA0600571A

CONTENTSSpecifications ...

— 1 —SPECIFICATIONSGENERALKeyboard: 49 standard-size keys, 4 octavesTones: 100Polyphony: 12 notes maximum (6 for certain tones)Auto accompanimentRhyth

— 2 —BLOCK DIAGRAMCPUMSM 6755B-17LSI1KeyboardButtonsLCDLCD DriverSED1278F0ALSI3Reset ICIC1OscillatorX1, Q1Power Supply CircuitQ101 ~ Q103, D104Power A

— 3 —CIRCUIT DESCRIPTIONKEY MATRIXNOMENCLATURE OF KEYSKI0 KI1 KI2 KI3 KI4 KI5 KI6KO0 C2 G#2 E3 C4 G#4 E5 C6KO1 C#2 A2 F3 C#4 A4 F5KO2 D2 A#2 F#3 D4 A#

— 4 —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

— 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 (IC101:

— 7 —3) Equipment connection/ProcedureVop voltage settingInputConnectionInputPointInputSignalAdjustOutputConnectionOutputPointAdjust forVR1 Voltmeter