Casio CTK-541 User Manual

ELECTRONIC KEYBOARDCTK-541JULY.1999CTK-541EEEINDEX

— 8 —ADJUSTMENTMAIN PCB1) Items to be adjusted:2) Adjustment and Test Point LocationsItemMeasuring InstrumentVop voltage setting VoltmeterVR1(BOTTOM V

— 9 —OutputSet VoltmeterCP3-CP43) Equipment connection/ProcedureVop voltage settingInputConnectionInputPointInputSignalAdjustOutputConnectionOutputPoi

— 10 —MAJOR WAVEFORMS1 Clock pulseGT913F(T) pin 1512 Power source CVDDJD connector pin 133 APO signalJD connector pin 12234 Sound waveform (R-ch) Tone

— 11 —PRINTED CIRCUIT BOARDSMain PCB JCM456-MA1MMain PCB JCM456-MA1MTop ViewBottom View1 7 8665243

— 12 —Sub PCB JCM453-MA2MTop ViewBottom ViewSub PCB JCM453-MA2M

— 13 —Console PCB JCM453-CN1Top ViewBottom ViewConsole PCB JCM453-CN1

— 14 —Keyboard PCB JCM618T-KY1MKeyboard PCB JCM618T-KY2MBottom ViewTop ViewTop ViewBottom ViewKeyboard PCB JCM618T-KY2MKeyboard PCB JCM618T-KY1M

— 15 —SCHEMATIC DIAGRAMSMain PCB JCM456-MA1M167234598

— 16 —Sub PCB KDM453-MA2M

— 17 —Console PCBs JCM453-CN1

CONTENTSSpecifications ...

— 18 —Keyboard PCBs JCM618T-KY1M / KY2M

— 19 —EXPLODED VIEW22331415292826272425302314153716376981334541238420201921183521172193 81018R-4R-4R-11534313632R-5R-3R-2101034341137

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

PARTS PRICE LISTCTK-541N Item Code No. Part Name Specification Q PRICE CODE RMain PCBN 1 6928 2120 PCB/ASSY (MA1M) M241173*1 1 DE BD1-D4 2775 2079 DIO

N Item Code No. Part Name Specification Q PRICE CODE RPanel unit14 3831 1096 SPEAKER S12J89A 2 BH B15 1908 6418 SCREW 4X8 13 AA C16 3335 6804 LCD LD-B

CASIO TECHNO CO.,LTD.Overseas Service DivisionNishi-Shinjuku Kimuraya Bldg. 1F5-25, Nishi-Shinjuku 7-ChomeShinjuku-ku, Tokyo 160-0023, Japan

— 1 —SPECIFICATIONSGENERALKeyboard: 61 standard-size keys, 5 octaves (with touch response on/off)Tones: 100Polyphony: 16 notes maximum (8 for certain

— 2 —ELECTRICALCurrent drain with 9 V DC: Nominal LimitNo sound output 330 mA 330 mA ± 20%Maximum volume 990 mA 990 mA ± 20%with 16 keys C1 to D3 pres

— 3 —BLOCK DIAGRAMCPUGT913F(T)LSI1KeyboardButtonsLCDLCD DriverKS0066U-10BLSI3Reset ICUPD6379GR-E1IC1OscillatorX1, Q1Power Supply CircuitQ201 ~ Q203,

— 4 —CIRCUIT DESCRIPTIONKEY MATRIXNOMENCLATURE OF KEYSKI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7KO0 C2 G#2 E3 C4 G#4 E5 C6 G#6KO1 C#2 A2 F3 C#4 A4 F5 C#6 A6KO2 D

— 5 —CPU (LSI1: GT-913F)The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces.The CPU detec

— 6 —Pin No. Terminal In/Out Function80 VCC In +5 V source81 GND In Ground (0 V) source82 MRDB Out Read enable signal output for the sound source ROM8

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