Casio CTK-750 User Manual

(with price)CTK-750ELECTRONIC KEYBOARDRCTK-750

— 8 —Digital Signal Processor (HG51A115A01FD)Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the soundso

— 9 —DSPHG51A115A01FDEffect RAM (256K-bit)HM65256BLPSound Source ROMTC5316200CP-C081CEA0 ~ A19 D0 ~ D15RA0 ~RA19RD0 ~RD15RA22D0 ~ D7A0 ~ A3LSISRDAPOWR

— 10 —DAC (UPD6376CX)UPD6376CX is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, outputamplifier and zero offset cir

— 11 —The following table shows the pin functions of the key touch LSI.Pin No. Terminal In/Out Function1 REQB Out Interrupt request. Not used.2, 3 FI

— 12 —Power Amplifier (LA4620)The power amplifier is a two-channel balanced amplifier with standby switch. The following figure showsthe internal diag

— 13 —WIRING DIAGRAMFI1FI2FI0SI0SI1SI2SI3FI3KC0KC1KC2KC3KC4KC5KC6KC7KC0KC1KC2KC3KC4KC5FI4SI4KC6KC7SI5SI6SI7FI5FI6FI7LGPWLDKO7KO6KO5KO4KO3KO2KO1KO0POWE

— 14 —MAJOR WAVEFORMS

— 15 —

— 16 —1219 10 1127 26 29 14 15 16 17 13 12 2 6 3 5 4 7 828 24 25 1922 23 20 18PCB VIEW and MAJOR CHECK POINTS

— 17 —11.611.611.410.910.95.20.00.00.00.75.35.32.62.62.62.62.62.62.62.65.911.611.85.15.85.25.30.70.05.25.23.23.23.411.01234561213182526272829242223197

— 14 —CONTENTSSpecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Replacing the DSP (HG51A115A01FD) .

— 18 —Console PCB M5712-CN1M

— 19 —Keyboard PCBs M615T-KY1M, KY2M

— 20 —EXPLODED VIEW

— 21 —IC LEAD IDENTIFICATION AND INTERNAL DIAGRAM TIMINGGENERATORSHIFT REGISTER LATCHMAIN DACSUB DACSUB DACMAIN DACLRCKLRSEL/RSISI/LSICLK4/

— 22 —B C EB C EE C BE C BQ2: 2SD1762E,FQ4: 2SB1274Q3, Q5, Q7, Q11/12: 2SC1740SQQ13: 2SA933SQQ14~21: DTA114TSQ

PARTS LISTCTK-750Notes: 1. Prices and specifications are subject to change with-out prior notice.2. As for spare parts order and supply, refer to the&

FOB JapanN Item Code No. Parts Name Specification Q M N.R.Yen R * Unit PricePCB Ass'y M5712-MA1M2010 4928 LSI HM65256BLP-10

FOB JapanN Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price2802 9231 Electrolytic capacitor 25RE3-2200-S1 2 10 75 C AN 2803

FOB JapanN Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price3637 5220 Ferrite core ZCAT2032-0930 1 1 170 C B4317 3820 Blank

FOB JapanN Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price27-1 6902 6140 Battery spring 90 M41226-1 1 10 27 B A2

— 1 —GeneralNumber of Keys: 61Polyphonic: 32-notePreset Tones: 128Tone Expander: Layer, SplitKeyboard Controls: Touch Response: On/OffTouch Sensitivit

MA0300941A

— 2 —ElectricalCurrent Drain with 12V DC: No Sound Output 390 mA ± 20% Maximum Volume 1700 mA ± 20%with white keys D2 to D3 pressed in Synth-B

— 3 —BLOCK DIAGRAMKC0 ~ KC7SI0 ~ SI7FI0 ~ FI7Key Touch LSIHG52E35PWorking StrageRAM (256K-bit)HM62256ALP-10Working StrageRAM (256K-bit)HM62256ALP-107

— 4 —CIRCUIT DESCRIPTIONKey MatrixKeySecond contact 2First contact 1FIKCSINote: Each key has two contacts, the first conatct 1 and second cont

— 5 —Nomenclature 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 B5C6D#3C2 D2E2F2G2A2 B2 C3 D3E

— 6 —Pin No. Terminal In/Out Function1 P40 Out KO signal data output2 P41 Out Clock for KO signal data3 P42 Out APO (Auto Power Off) signal o

— 7 —Gate Array (UPD65005C-578)Functions of the gate array are;(1) To decode chip select signals for the working strage RAM, the DSP and the key touch