Instruction/ maintenance manual of the product CTK-750 Casio
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(with price) CTK-750 ELECTRONIC KEYBOARD R CTK-750.
— 14 — CONTENTS Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Replacing the DSP (HG51A115A01FD) . . . . . . . . . . . . . . . . . . . . . 2 Block Diagram . . . . . . . . . . . . . . . . . . . .
— 1 — General Number of Keys: 61 Polyphonic: 32-note Preset Tones: 128 Tone Expander: Layer, Split Keyboard Controls: Touch Response: On/Off Touch Sensitivity: Light/Middle/Heavy Key Transpose: Ra.
— 2 — Electrical Current Drain with 12V DC: No Sound Output 390 mA ± 20% Maximum Volume 1700 mA ± 20% with white keys D2 to D3 pressed in Synth-Bass-2 tone and in Latin Fusion rhythm at initial .
— 3 — BLOCK DIAGRAM KC0 ~ KC7 SI0 ~ SI7 FI0 ~ FI7 Key Touch LSI HG52E35P Working Strage RAM (256K-bit) HM62256ALP-10 Working Strage RAM (256K-bit) HM62256ALP-10 7-Segment LED LO0 ~ LO4 LED driver .
— 4 — CIRCUIT DESCRIPTION Key Matrix Key Second contact 2 First contact 1 FI KC SI Note: Each key has two contacts, the first conatct 1 and second contact 2 .
— 5 — Nomenclature of Keys F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6 D#3 C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 B6 A6 G6 F6 E6 D6 C7 C#3 A.
— 6 — Pin No. Terminal In/Out Function 1 P40 Out KO signal data output 2 P41 Out Clock for KO signal data 3 P42 Out APO (Auto Power Off) signal output. ON: High, OFF: Low 4 P43 Out Read enable signal output 5 P44 Out Write enable signal output 6 P45 Not used.
— 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 LSI.
— 8 — Digital Signal Processor (HG51A115A01FD) Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the sound source ROM in accordance with the selected tone; the DSP can read rhythm data simultaneously when a rythm pattern is selected.
— 9 — DSP HG51A115A01FD Effect RAM (256K-bit) HM65256BLP Sound Source ROM TC5316200CP-C081 CE A0 ~ A19 D0 ~ D15 RA0 ~ RA19 RD0 ~ RD15 RA22 D0 ~ D7 A0 ~ A3 LSIS RDAPO WRAPO RESET SOLP BOK WOK1 EA0 ~ EA14 ED0 ~ ED15 CS WE OE D0 ~ D15 A0 ~ A14 ECEB EOEB EWEB PG 16.
— 10 — DAC (UPD6376CX) UPD6376CX is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, output amplifier and zero offset circuit. Key Touch LSI (HG52E35P) By counting the time between first-key input signal FI and second-key SI from the keyboard unit, the key touch LSI detects key velocity of 256-step.
— 11 — The following table shows the pin functions of the key touch LSI. Pin No. Terminal In/Out Function 1 REQB Out Interrupt request. Not used. 2, 3 FI10, SI10 In Key input signal 4 VCC In +5V source 5 CRDB In Read enable signal 6 CWRB In Write enable signal 7 CCBB In Chip select signal 8, 9 T, STBY In Not used.
— 12 — Power Amplifier (LA4620) The power amplifier is a two-channel balanced amplifier with standby switch. The following figure shows the internal diagram of the amplifier. Internal Diagram of LA4620 Input Amp. Pre-drive Amp. Power Amp. RL Short Protector Input Amp.
— 13 — WIRING DIAGRAM FI1 FI2 FI0 SI0 SI1 SI2 SI3 FI3 KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7 KC0 KC1 KC2 KC3 KC4 KC5 FI4 SI4 KC6 KC7 SI5 SI6 SI7 FI5 FI6 FI7 LG PWLD KO7 KO6 KO5 KO4 KO3 KO2 KO1 KO0 POWER .
— 14 — MAJOR W A VEFORMS.
— 15 —.
— 16 — 1 21 9 10 11 27 26 29 14 15 16 17 13 12 2 6 3 5 4 7 8 28 24 25 19 22 23 20 18 PCB VIEW and MAJOR CHECK POINTS.
— 17 — 11.6 11.6 11.4 10.9 10.9 5.2 0.0 0.0 0.0 0.7 5.3 5.3 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.6 5.9 11.6 11.8 5.1 5.8 5.2 5.3 0.7 0.0 5.2 5.2 3.2 3.2 3.
— 18 — Console PCB M5712-CN1M.
— 19 — Keyboard PCBs M615T -KY1M, KY2M.
— 20 — EXPLODED VIEW.
— 21 — IC LEAD IDENTIFICA TION AND INTERNAL DIAGRAM TIMING GENERATOR SHIFT REGISTER LATCH MAIN DAC SUB DAC SUB DAC MAIN DAC LRCK LRSEL/RSI SI/LSI CLK 4/8 fs SEL D.
— 22 — B C E B C E E C B E C B Q2: 2SD1762E,F Q4: 2SB1274 Q3, Q5, Q7, Q11/12: 2SC1740SQ Q13: 2SA933SQ Q14~21: DTA114TS Q1/6: 2SB1240Q,R.
P ARTS LIST CTK-750 Notes: 1. Prices and specifications are subject to change with- out prior notice. 2 . As for spare parts order and supply , refer to the "GUIDEBOOK for Spare parts Supply", published separately . 3. The numbers in item column correspond to the same numbers in drawing.
FOB Japan N Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price PCB Ass'y M5712-MA1M 2010 4928 LSI HM65256BLP-10 1 1 720 A H 2011 3325 LSI UPD6376CX 1 1 230 A C 2011 5194 LSI HG52E3.
FOB Japan N Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price 2802 9231 Electrolytic capacitor 25RE3-2200-S1 2 10 75 C A N 2803 6743 Electrolytic capacitor 50RBP2-R22-T2-T 2 20 16 C A .
FOB Japan N Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price 3637 5220 Ferrite core ZCAT2032-0930 1 1 170 C B 4317 3820 Blank PCB M615T-KY1M M111575-1 1 1 260 C C 6921 8590 PCB ass&ap.
FOB Japan N Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price 27-1 6902 6140 Battery spring 90 M41226-1 1 10 27 B A 27-2 6903 2150 Battery spring B M41330-1 1 10 18 B A 27-3 6919 3190 .
MA0300941A.
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If you have not bought Casio CTK-750 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Casio CTK-750 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Casio CTK-750 you will learn all the available features of the product, as well as information on its operation. The information that you get Casio CTK-750 will certainly help you make a decision on the purchase.
If you already are a holder of Casio CTK-750, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Casio CTK-750.
However, one of the most important roles played by the user manual is to help in solving problems with Casio CTK-750. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Casio CTK-750 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
