Casio CTK-245 User Manual

GM SOUND KEYBOARDCTK-680CTK-680

— 10 —DAC (IC11: UPD6376GS)The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of themelody, chord, bass, an

— 11 —The following table shows the pin functions of LSI16.Pin No. Terminal In/Out Function1 REQB Out Not usedFI8 ~ FI10,SI8 ~ SI104 VCC In +5 V sourc

— 12 —GATE ARRAY (LSI17: UPD65611GB)The gate array provides chip enable signals for DSP, Key Controller, and Working Storage RAM. The LSIalso generate

— 13 —POWER AMPLIFIER (IC202: LA4598)The power amplifier is a two-channel amplifier with standby switch.The following table shows the pin function of

— 14 —IC17UPD65611GB-019-3BALGCPULSI14HD6433294A33FLVDDP40P41LC1LC8KO0 ~ KO3, KO5IC301BA612LED DriverQ15 ~ Q18LED DriverLD0 ~ LD7La ~ Lg, LpGate array

— 15 —MAJOR WAVEFORMS13BEFCD4590A2678CH1CH1CH1CH2CH2CH3CH2CH1CH3CH1CH2CH3CH2CH1CH2CH3CH1: 5 VCH1: 5 V CH2: 5 V CH3: 5 VCH2: 5 V CH3: 5 VCH1: 5 V CH1:

— 16 —PRINTED CIRCUIT BOARDSMAIN PCB JCM717-MA1MTop viewBottom viewR124R123R122R121R120R119R118R117R116R115R114R113R112R111R110R109R108R107R106R105R10

— 17 —SCHEMATIC DIAGRAMSMAIN PCB JCM717-MA1MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA3MMA

— 18 —SUB PCB JCM716-MA2M

— 19 —CONSOLE PCB M716-CN1M

— 2 —CONTENTSSpecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Block Diagram . . . . . . . . . . . .

— 20 —KEYBOARD PCBs JCM617T-KY1M/KY2M

— 21 —EXPLODED VIEW141312124516171921222320798618241531R-1R-3R-21110102

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 6925 7090 Main PCB ass'y, M717-MA1M M140443*2 1 BLSI2 2012 5159 LSI, ROM MX23C2410MC-12CA54 1

Item Code No. Parts Name Specification Q R8 6922 2740 Black key set 10P M111726-12A9 6922 2750 Black key set 5P M111726-21A10 6922 2761 Key contact ru

MA0100271A

— 3 —Other functionsTranspose: 25 levels (1 octave lower C to 1 octave upper C)Tuning: Adjustable: A4 = 440 Hz ± 50 centsPitch Bender: Adjustable rang

— 4 —BLOCK DIAGRAMKC0 ~ KC7SI0 ~ SI7FI0 ~ FI7Key ControllerLSI16HG52E35PWorking Storage RAM(256K-bit)LSI15TC55257DFL-70LKO1 ~ KO4, KO8LED DriverIC301

— 5 —CIRCUIT DESCRIPTIONKEY MATRIXNote: Each key has two contacts, the first conatct (1) and second contact (2).KeySecond contact (2)First contact (

— 6 —KI1 KI2 KI3 KI4KO0 MODE PAD A PAD B PAD DKO1 TEMPO UP TEMPO DOWN START/STOP PAD CKO2 RHYTHM TONEKO3MAGICAL PRESETLAYER SPLITKO4 DEMOTOUCH RESPONS

— 7 —CPU (LSI14: HD6433294A33F)The 16-bit CPU contains a 32k-bit ROM, a 1k-bit RAM, seven 8-bit I/O ports, an A/D convertor and MIDIinterfaces. The CP

— 8 —Pin No. Terminal In/Out Function1 ~ 8 CD0 ~ CD7 In/Out Data bus9, 10 CE1, TRSB — Not used11 GND7 In Ground (0 V) source12 CK16 Out Terminal for 2

— 9 —Block diagram of DSP and DAC circuitPin No. Terminal In/Out Function106 EOEB Out Read enable signal output for the effect RAM108 VCC7 In +5 V so