Casio casio sk-5 User's Manual
Contents
1. 3SIEM IAM 2 PCB VIEW amp MAJOR CHECKPOINTS TE NTEGER ur TO ol H fO eo SS N 3 MAJOR WAVEFORMS Notes Photographs of waveforms have been taken using a memory scope Attenuation Radio of probes 10 1 1 RESET signal 2 Signal MI When AC adaptor is inserted At Power ON 0 2V div 0 1 sec div 0 2V div 1ms div 3 CPU clock 5 Signal SH Percussion Generator Clock 6 Melody Circuit Output 0 2V div 0 5us Tone Pipe Organ Key C2 5OmV div ims div 1 Ne 892815 eeleva ino 5 owag 10 3409 LLL Bu xiIIAJ 9520017 UNOAID Apojayy m 193 duio22 v ME 191043405 ssaippy 617 07 sng 0 01 001 1 0 03 101819 41 811 11 LLON 00N Ll Aay 23 256 AC 4 BLOCK DIAGRAM M 5 KEY amp SWITCH MATRIX Dog Sample 2 Memory Memory Sample Long KO6 Rock 1 16 Beat K 07 KO11 Accomp Chorus Sample 3 Disco 12. 89 EH Out Melody envelope signal output 90 EG Out Melody or obbligato envelope signal output 91 EF Out Melody or chord envelope signal output 92 EE Melody or bass envelope signal output 93 SH Out Melody pitch signal output 94 SG Out Melody or obbligato pitch signal 95 SF ow Melody or chord pitch signal 96 SE Out Melody or bass pitch signal 97 No function 98 AGND 5V source for DAC Digital to Analog Converter 99 Ground OV source for DAC VDAC Sampling sound nput signal from MIC terminal 190 107 Sampling E read clock Read Cycle pulse refresh Timing chart of sampling CPU for ROM and RAM Write Cycle pulse refresh Floating Cycle pulse refresh 10 t 1 fPG 7 802MHz Lei 3 r dj 7 PERCUSSION GENERATOR MSM6294 02 Containing a internal ROM 128 Kbit for percussion data and internal 8 bit DAC Digital to Analog Converter the LSI provides percussion sounds Percussion Out Data Bus CPU Percussion Percussion Filter MSM6293 Generator MSM6294 WR Oscillator fo 256 KHz Pin Function of Percussion Generator Signal In Out Function 1 RESET in Reset signal input LOW active The terminal holds LOW level at power switch o
3. OM 1951 95 MO 1797 o S E pt Itt 14 191 121 02 top 1 101 12 amp 0 17 los 5 102 9111 1 0516 ie 192 1352 15 59 ee 3 2 1 04 18 103 92 D a 19 T 9 ROM 3 8 7 VDD 2 HB eg D 8 7 IVA OD a als mu i CIO3IH i i f Tircuit 5 you i 2104 1H1 68K AW 470K CI02 H JLH x LC4969 1 128 25140 8 1 100K j vD 583 1 22K i L D MATS 100K 1 2 2 20 at 5 7 abs a 8 ots Val ow z ny j ampling Circuit VL keo lt e gt j 2 28 Lom CHAIR ES 1 1 ere o t l pex TR 119 ANN MIC j L l vu y P PEERS _ 1 2 3126 1 2 4 KH K12 5 1 2 KI3 KI4 12 Disco 1 Disco 2 MEMORY sm Kli KI2 S16 omes 16 Beat March TEMPO 4 6 14 SIS AUTO PLAY Bossa Nova Samba TEMPO v MELODY GUIDE Slow Rock Waitz MEMORY STOP r K010 2 8 515313158 3 52 lt x x x x x x x x x x x x 4 Sake
4. T D O DD D D D D D D D 1 J L 1 N 1 74 32 JD CN JD 20 1 CN2 EE CN2 2 2 N2 26 5 20 5 CN2 20 5 PN D 6 CN 20 7 2 7 2 55 20 8 wq J0 6 N 20 20 5 444 JD 9 2 8 25 124 2 01 CNZ 22121 09 OU CN2 2 2 1510 VA I gt als 3 pes 58 32 29 t z 28 4 27 26 E T 2 Ale C T Ace 28 ne ee 28 22 2 27 2 127 ar 23 7 3 26 A 37 06 2 22 I a Ab 41 ne 25 Ac bs 3 21 A5 Sag 9 9 5 dm ag Be 5 8 P CPU 20 5 AG 5 5 an 23 5 H2 AS g 22 2 o dm MSM6263 13 Ax A2 410 A2 E A2 B An 21 19 1027 a T 197 T AYR sce 5 107 ne 15 z 7 gt gt 100 n 170818 05 n g HS 15
5. 813 12 72 _ al j oja d SESH za 3 x wns Q o 258 E ul 3 2 2832902 2 3 S0 762954 2 5 320302 7 4 552584255552 S S 301 ys 2 FEA oe E 3 8 8 S z a 8 iz STS ar AM 4 5 3 3 01 5 we AS 5 EN 8 Wy WSL 2 5 x z AAA o 2 ino zi n 35410911952 8 p m LI ced s 8 g0 3 3L 5 2 1089 x Che Te 1 a 22 xc JNO ul 1 s 1 7 5 aes 5 Bol IE 2028 Ae w 3 Limzess Sy o ALY AL e s xo 8 o z x 50 zz 1007 NI o 5 lt 32 5 s 5 FX m E RIS lt 9 ELS 1205 lt mm nn BT e a 1776151 SSC 222 2 a 18922004 25C1740LNSR 25493350 25Bi266R n uSNT0 LIOSC 55410711952 S 9056 89 AL o 0 AOZ 322 a Z 1 ay O WA 3 45 A d wavs 5354345 75 um 5 m m O TOT H ung R TT
6. 2250 0007 Transistor 2SA934R 1 110 2220 2632 Transistor 2SC2060R 1 10 2300 2086 Diode 155254 20 20 C 2606 0049 Carbon film resistor R 20 100K G T24 T 2 20 C 1 5W 100Kohm 296 2606 0483 Carbon film resistor R 20 4 7K G T24 T 1 20 1 5W 4 7Kohm 2 2606 0532 Carbon film resistor R 20 10K G T24 T 1 20 1 5W 10Kohm 2 2617 0028 Carbon film resistor R 20 100 J T24 T 1 20 1 5W 1000hm 5 2617 0044 Carbon film resistor R 20 560 J T24 T 1 20 1 5W 560ohm 5 Note New parts Rank A Essential Q ty Quantity used per unit e NND recommended ers 5 Minimum order and supply quantity 19 Unit Price Item Code No Part Name Specification Q ty N R Yen X Rank FOB JAPAN 2617 0052 Carbon film resistor R 20 1K J T24 T 7 20 1 5W 1Kohm 596 2617 0081 Carbon film resistor R 20 2 2K J T24 T 7 20 0 1 5W 2 2Kohm 5 2617 0095 Carbon film resistor R 20 10K J T24 T 17 120 C 1 5W 10K ohm 55 2617 0109 Carbon film resistor R 20 33K J T24 T 2 420 C 1 5W 33Kohm 596 2617 0117 Carbon film resistor R 20 47K J T24 T 8 20 C 1 5W 47K ohm 596 2617 0125 Carbon film resistor R 20 68K J T24 T 6 20 C 1 5W 68Kohm 5 2617 0133 Carbon film resistor R 20 82K J T24 T 2 20 C 1 5W 82Kohm 15 2617 0141 Carbon film resisto
7. 5 3 001 I AF dE dE di di 13 POWER SUPPLY CIRCUIT 0 VH 7 5V t 9 OVL1 0V 2 c LED in es 5 7303 CS ovx v OVD 5V 3 35V y OVL2 0V 8 71 E 8 DC7 5V OVA 5V Input 27 79 A OVC 5V s A 7 2 u VDDT GND The Power Supply Circuit consists of a voltage regulator and APO Auto Power Off circuit When power is ON and operation is normal the APO signal from the CPU maintains HIGH level Transistors T4 turn on providing the voltages to the circuits The signal APO becomes LOW when the keyboard is not operated for seven minutes and transistors T4 T9 turn off causing the voltages except VA to shut off Voltages VA 5V and VDD1 ground are always provided to the CPU even at APO Transistors T1 T2 and form voltage regulator Using the LED characteristic of current regulation transistor stabilizes the battery voltage at 5V and the darlington connected transistor T1 and T2 prevent over current in the circuits 14 TROUBLESHOOTING TROUBLE FAULTY BLOCK CHECKPOINT No Power Power Circuit Checkpoints voltages in accordance with the schematic diagram Power Switch Switch contacts and switch spring tension Reset Circuit Waveform 1 Power ON D
8. Semi conductive capacitor RT CAOTKYR102K T 5 120 C 2813 0651 Semi conductive capacitor RT CAOTKY R332K T 1 120 C 2813 0658 Semi conductive capacitor RT CbOTKYR822K T 1 20 C 2818 2164 Ceramic capacitor RT HESOTKCH 151J T 1 410 C 2818 3241 Ceramic capacitor RT HEBOTKCH101J T 2 10 C 2818 3330 Ceramic capacitor RT HE60TKCH560J T 1 120 C 2819 0379 Ceramic capacitor RT HEAOTKYB151K T 1 110 2819 0450 Ceramic capacitor RT HE7OTKSL221K T 1 10 2819 0565 Ceramic capacitor RT HESOTKSL471K T 1 110 2819 5362 Ceramic capacitor DD406SR473K 16 T 6 20 C 2830 6211 Mylar capacitor AMZV 154K50 T 1 110 4307 7420 Blank PCB M3126 MA1M M11300 1 1 X Note New parts FOES Eg et re Q ty Quantity used per unit B Stock recommended x Minimum order and supply quantity C Others X No stock recommended 21 Unit Price Code No Part Name Specification Yen X Rank FOB JAPAN 4 2 M3126 CN1M PCB ASS Y 2301 0097 Diode 192473 10 20 42 2320 9764 LED LN251RPP WE 1 10 4307 7410 Blank PCB M3126 CN1M M11290 1 1 3 M3126 CN2 PCB ASS Y 2010 2597 LSI MSM 5268 56GS K 1 A 2818 7114 Ceramic capacitor HE7OTJYF103Z 1 10 C 4307 7430 Blank PCB M3126 CN2 M32686 1 1 4 M3129 KY1M PCB ASS Y 2300 2086 Diode 1SS254T 32 20 4307 5041 Blank PCB M3129 KY 1M M21332A 1 1 5 UPPER CASE SUB ASS Y 1 3831 0070 Speaker EAS 8P109T 1 B 2 6909 75
9. 5 4 8 N h 9 26 14 q 253 100 9 2 ES a 107 Address bus AO A14 _ Data bus 100 107 Data bus DO D7 uPD43256C 12L is a 256Kbit RAM for storing sampling sounds and Demo Music ROM data The data in RAM are kept even power switch OFF as long as DC7 5V is provided uPD23C256EAC is a 256Kbit ROM and contains preset tone percussion data and system execution program 5 6294 02 is a percussion generator and issues percussion sounds in accordance with the data from CPU The chip select condition is as follows Ship selection A15 CE CE1 RAM L L High level ROM H L X L Low level X irrelevant Percussion generator x x L 14 i H TEL TEL TEL EL TEL TEL EL TL TLUTE 7 A al 11 DEMO MUSIC ROM ACCESS Demo Music ROM CE1 01 02 21 04 Data bus D4 D7 I CPU 100 A MsMe282 05Gs 107 Data bus DOY D7 pPD43256C 12L Assigning Demo Music ROM by being LOW of signal CE2 CPU reads data from the ROM directly and generates programmed melody and accompaniment signals Since the data bus D4 D7 carries data and address signal OP determines either the bus carries data or address Signal C1 and C2 are clock pulse for data transfer OP D
10. lt KI4 EDIT 5 78 12 KI8 START Piano Vibraphone SAMPLE Tune 14 K12 K17 4 Dog Surf SAMPLE2 Tune V s 2 KI3 KI2 B Trumpet Pipe SAMPLE3 PADI PAD2 SAMPLE LONG KI3 ure KI4 5 KI4 5 ae STOP Chorus Fiute SAMPLE4 PAD4 SAMPLE NORMAL IH im j m MTS 8 G H I ES K d dh Uh Uh Ue Ho Mo Hi Mi i YY ib WM 1 3 PCB M3126 CN2 A 2 C103F 1 GND I 75 2 _ 2 0 3 Ue J0 3 o Wi D 4 70 5 3 JD 6 7 MAIM JD 7 Jp E es 7 JD 8 8 MAIN TJD 8 24 9 4 TD O Mff 9 16 7 0 11 11 4 5 225200002402 Do Keyboard PCB M3129 KY 1M 1 4 60 52 97 5 761 wiv jai 6 77 vr myn Ja c vr vC y 1 vr 9 vr 9 vr 6 76 e vr myn Bej e vr 6 72 P 6 Lor vr Bel 01 772 n vr 11 72 Bel Zi ve 805 a
11. s clock pulse 48 Out Demo Music data address change signal Data bus for Demo Music ROM becomes data or address in accordance with the voltage level of this signal 49 52 DO D3 Out Data bus for Percussion generator T 53 56 04 07 Out Data bus for Percussion generator and data address bus for Demo Music ROM 4 57 58 OSI OSO In Out 7 277 MHz clock pulse input and output d 58 MI In Power ON detection signal input HIGH active Receiving pulse at Power ON CPU starts functioning 60 Reset signal input HIGH active The terminal receives a pulse which resets CPU internal circuit when new batteries or AC adaptor is set 61 No function 2 Ah 82 KO14 Out Accompaniments volume control signal 53 1 3 Out ROM and RAM chip select signal 1 Sampling CPU internal clock 86 88 E EH the internal circuits of the Percussion generator are initialized Pin No Terminal Name In Out Function 64 O12 Out APO Auto Power Off signal output Terminal drops to LOW level to shut the voltages off when the unit is not operated for approximately 6 minutes 65 76 KO11 KOO Out Key common signals 77 84 KI8 In Key input signals 85 POO Out Reset signal for Percussion generator The terminal holds LOW level at power ON for a while during which F No function
12. turn on When the demon stration music is played KO14 falls to LOW level turning the switches off and all the accompaniment signals are reduced as they pass through the resistors I pe 7 uU o UU 9 SAMPLING CIRCUIT Internal MIC External MIC CPU MSM6283 02Gs Vin e 2 Line in MIC Amp Circuit VL1 Fig 1 Sample Sound Input Circuit VC Sampling Sound F Input Signal Te su fear Sampling Start Area E EE 0 315V 1 er Es Vin 2 557V dU 2242N Sampling Start Sampling Start Area Fig 2 Vin Input Trigger Level As shown in Fig 1 the circuit provides sampling signals to the Vin terminal of the CPU Resistors 100Kohm and 100 4 7 Kohm bias the sampling signal on 2 863V When the sampling sound level exceeds 0 315V as shown in Fig 2 the CPU starts to transmit the sampling sound data to the RAMs during the following period While sampling the CPU transmits the sampling sound data to the sampling RAMs directly While sampling CPU does not output key common signals KO9 so that the keyboard becomes inoperative Sampled sounds are digitized in CPU and transmitted to the 13 10 PERIPHERAL DEVICE ACCESS PG 256kHz VA MA MSM6283 05GS 5 S e 5 E RESET 5 K013 Q
13. 0160 Black key set i M1844 1 1 C 22 6907 0300 Contact rubber j M31953 1 1 B 23 6907 4551 Shield plate 129A 21391 1 1 110 424 6909 6030 i Upper case sub ass y 21723 1 C 25 6909 6041 Keyboard pannel M21282A 3 1 C 8 LOWER CASE ASS Y 26 6905 8343 Battery cover sub ass y M31417C 8 1 110 C 27 6909 6011 Lower case sub ass y M21708A 3 1 28 6909 6020 Rating plate 126 42444 12 1 120 C 29 6909 6720 Shield plate 121A M21733 1 1 5 X 30 6902 6690 Rubber foot M41361 1 4 10 31 6912 2870 Felt seal M42538 1 1 20 32 6912 2630 Battery spring 120 M42382 1 1 20 C 33 6345 2238 Battery spring G55 A42606A 1 1 110 C Note New parts Rank A Essential Q ty Quantity used per unit e Stock recommended Others d d l tit No stock recommended H H R Cu a ee M3129 KY 1M M3126 MA1M This Service Manual was scanned Joerg Zeitschel CASIOLOGIE I want to thank everybody wo donated a small amount to continue this service To publish this rare Casio Service Manual wouldn t been possible without the efforts of the CASIOBEND Forum and the CASIO BOARD Forum If everything seems to be unreadable I will be able to make a zoomed scan of the special area on request Greetings Joerg See you at http www casiologie de
14. 20 Slide VR knob 123 M32610 2 1 20 C 3 6905 8220 Slide knob 155 M31954 1 2 20 C 4 6907 0110 Contact rubber 129B 1 M42607 1 1 10 B 5 6907 0120 Contact rubber 129B 2 M42607 2 1 B 6 6909 5252 DS contact rubber 121 M32611B 1 2 B 7 6909 5880 Slide board switch S CSB 12S 1 10 C 8 6909 5890 Slide board switch D CSB 12D 1 10 C 9 6909 6091 Button 126 set M32694A 1 1 C 10 6909 6180 CN spacer M43268 1 1 20 X 11 6909 6190 Contact rubber 126A M43264 1 1 5 12 6909 6200 Contact rubber 126B M43265 1 1 110 B 13 6909 6210 Contact rubber 126C M43266 1 1 10 14 6907 0270 Key stopper B32 M42611 1 1 10 C el el er eee 7 Note New parts Rank A Essential Q ty Quantity used per unit 2 Stock recommended x Minimum order and supply quantity Others X No stock recommended 22 HHN HHJ JJ UR UP UP B H IPTE ar uc a en Unit Price Item Code No Part Name Specification ty N R Yen Rank FOB JAPAN 151 6908 6071 Key stopper A32 M32043A 2 1 ir 16 6909 5370 Felt seal M43277 1 1 20 C 17 6909 6006 Blind 126 M43267 1 1 20 6 MIC ASS Y 18 3830 9021 Condenser MIC WM 034CY 1 19 6907 0321 Sponge 129 42612 1 1 20 x 7 KEYBOARD ASS Y 20 6907 0150 White key set M1843 1 1 C 21 6907
15. 4 07 HIGH Data LOW Address 2 545 7 0411 uuuuuyg UUUU EM DBA DE mem i Time Chart of Data Transfer zB 12 amp POWER ON OFF DETECTION CIRCUIT Play Record oe O Auto Play Melody Guide KI2 CPU MSM6283 05GS Power ON OFF Detection Re RE To Power Supply Circuit Power ON Power OFF Reset T Circuit B 44 14 e INoise Cut by Noise Killer VDD1 When the power switch is turned on terminal MI receives a DC7 5V application differential pulse which triggers CPU operation By receiving signal KO9 from 1 KI4 KI8 terminal CPU descriminates the Mode switch position Since VA stays at 5V even power switch is turned off or at the APO Auto Power Off the reset signal appears only when new batteries are set or an AC adaptor is inserted D The noise killer circuit eliminates negative portion of signal CPU reset MI at Power OFF 5 8053 is a voltage detector which observes VA 5V When voltage VA becomes less than 2 8V output pin 1 provides LOW level to turn 113 on Receiving HIGH level from RESET terminal CPU stops its functioning Voltage down VA 1 OUT 2 VDD 3 10V 3 VSS 2 80 I 1 VDD1 1 OUT Bottom View
16. Disco 2 Bossa Nova Samba Sample Sample Pad 2 Pad 3 Rhythm Pad Hi Low Lion Bongo Bongo 6 CPU MSM6283 05GS Generates Pitch and Envelope signals for Melody Chord Bass and Obbligato sounds o Controls Keys Switches and peripheral devices The following table is the pin functions of the CPU Pin No Terminal Name In Out Function 1 BGND 5V source for internal ADC Analog to Digital Converter 2 VADC Ground OV source for internal ADC T 3 4 No function 5 11 100 106 In Out Data bus DO D6 12 AO Out Address bus 0 13 107 In Out Data bus D7 14 A1 Out Address bus A1 15 CE Out Chip enable signal for memory devices LOW active T 16 18 A2 A10 Out Address bus A2 A3 A10 19 No function 20 29 A4 9 11 14 Out Address bus A4 A9 A11 A14 30 A15 Out Output enable signal for memory devices LOW active 31 WE Out Write enable signal for RAM LOW active 32 38 No function 39 CE1 Out Write enable signal for Percussion generator LOW active 40 GND 5V source 41 CE2 Out ROM pack s chip select signal LOW active I 42 No function 43 VDD1 Ground OV source for internal digital circuit 44 VDD2 Ground OV source for internal analog circuit 45 No function 46 47 CP1 2 Out ROM pack
17. HOOTING ae ean et us 18 PARTS LIST ERBE EEE CPP 19 m m m m m M H ON HM N OHN ON SCHEMATIC DIAGRAM 1 M3126 MA1M 1 1 TC40668P 3 41 VA HEAD PHONE OC IN i A ss i GED o ao s KE 5 y 2 z 5 o 588 5 3 ele SL or oj 15 als lei lt 90 lt Ss ot o LON us 903 o u GE Rg 7 1 2 0019 60 E Y 25 i 910 5 76 7 2 110 x 01 6 M rre gt Tt 8 dE T 6 1 wa I 7 309 7 lt af MUvESOB S 7 Sm s Dos 2 5 2 E o g 1908049199 5 91 KETTE 930v as nd 320 28 lu m ss EA 7 a
18. REV 1 1 1 1 i ary 1 Lu rl MEN I lt 1 2 5 EJ s ELECTRONIC KEYBOARD K MAR 1987 Service MANUAL PARTS L J J IP AI I IP I LE I DH DT Pa 1 IP H IP I IP AT AT IP IP AT IP IP IT 1 SCHEMATIC DIAGRAM 1 1 PCB M3126 MA1M 1 1 2 PCB M3126 CNIM 2 1 3 PCB aset sums Meth 3 14 Keyboard M3129 KY1M 4 2 VIEW amp MAJOR CHECKPOINTS 5 3 MAJOR WAVEFORMS 6 4 BLOCK DIAGRAM 7 5 KEY amp SWITCH MATRIX 8 6 CPU MSM6283 05GS 9 7 PERCUSSION GENERATOR MSM6294 02 N 11 8 MELODY CIRCUS Ades ee ae fe bets ae 12 9 SAMPLING CIRCUIT 13 10 PERIPHERAL DEVICE ACCESS 14 11 DEMO MUSIC ROM ACCESS 15 12 amp POWER ON OFF DETECTION CIRCUIT 16 13 POWER SUPPLY CIRCUIT 17 14 TROUBLES
19. d Tou nm CR Ry TE Ss T OM Ro Po Ir UR UR UU Unit Price Code No Part Name Specification Q ty Yen Rank FOB JAPAN 2617 0491 Carbon film resistor R 20 330K J T24 T 1 20 C 1 5W 330K ohm 1596 2617 0505 Carbon film resistor R 20 33 J T24 T 1 20 C 1 5W 33ohm 5 2617 0877 Carbon film resistor R 20 8 2K T24 T 1 120 C 1 5W 8 2K ohm 596 2801 7189 Electrolytic capacitor 5ORE 2 R33 T 14 T 4 20 2804 5956 Electrolytic capacitor SORE2 2R2 T2 T 2 C 2805 3061 Electrolytic capacitor 6 3RE2 220 T2 T 2 C 2805 3100 Electrolytic capacitor 16RE2 10 114 T 1 M0 C 2805 3142 Electrolytic capacitor 16RE2 10 T2 T 2 120 C 2807 1082 Electrolytic capacitor 16RE2 100 T2 T 2 10 C 2807 1104 Electrolytic capacitor 6 3RE2 100 T14 T 1 120 2807 1112 Electrolytic capacitor 10BR E2 100 T2 T 2 120 2807 1121 Electrolytic capacitor JORE2 220 T2 T 2 20 C 2807 1155 Electrolytic capacitor 5O0RE2 1 T14 T 3 120 0 2807 1180 Electrolytic capacitor 10RE2 47 T2 T 3 120 C 2813 0245 Semi conductive capacitor RT CBOTKYR103K T 9 20 C 2813 0294 Semi conductive capacitor RT CGOTKY R223K T 2 20 C 28130525 Semi conductive capacitor RT CBOTK Y R682K T 1 20 C 2813 0560 Semi conductive capacitor DD408SR 104K 16 T 11 20 C 28130644
20. der and supply refer to the GUIDEBOOK for Spare Parts Supply published separately ik 3 Thenumbers in item column correspond to the same numbers in drawing HM di Code No Part Name Specification FOB JAPAN 1 M3126 MA1M PCB ASS Y 2010 1946 LSI RAM uPD43256C 12L 1 A 2010 2247 LSI CPU MSM6283 05 1 A 2010 2604 LSI Percussion LSI MSM6294 05 1 A 2010 2611 LSI ROM 23 256 038 1 gt 2105 0532 C MOS IC LC4969 1 10 A 2105 0630 C MOS IC M74HC32P 1 110 2105 0637 C MOS IC M4066BP 1 5 2114 0252 Monolithic CA91A02 1 A 4 2120 8329 Linear IC Power Amp LA4138 1 A 2251 0126 Transistor 2SB1268R 1 5 A 2320 9616 LED LN2G 1 110 B 2765 0315 Semi fixed resistor V6EK PVB5K 1 120 36 2765 0364 Slide volume EWA MFOX25B14 1 5 B 2801 7301 Electrolytic capacitor 6 3RE2 100 F 1 20 C 2804 4801 Electrolytic capacitor 16RE2200 1 5 C 7 2845 0203 Module capacitor CNB4X221K 1 110 C 37 2898 0021 Trimmer capacitor VCT84K911A 1 5 B 38 3501 0035 DC jack 2305 01 050 1 110 39 3612 0665 Jack YKB21 5006 1 B 40 3612 0711 Miniature jack YKB21 5101 2 B u 41 3841 0007 Coil L10P 7L 10 B 3850 1216 MOS IC S8053ALR 1 A 6912 1190 Felt seal M4768 5 1 20 EE 2200 3721 Transistor 25933 0 2 10 2220 1425 Transistor 28C1740L NSR TP T 11 10 A
21. etector Waveform Q CPU MSM6293 Pulse Generator Waveform ROM uPD23C256EAC No sound at all Power Circuit Voltages VA VX Reset Circuit i Waveform 0 Pulse Generator Waveform 3 CPU MSM6293 ROM uPD23C256E AC I Mixing Amp Emitter of transistor T11 Power Amp LA4138 Pin2 Speaker Speaker terminal red wire ET No melody chord bass and CA91A02 obbligato percussion sounds Filter Emitters of T14 and T15 CPU 5 6293 No chord bass and obbligato CA91A02 Gain Controller Pin 11 of TC4066 CPU uPD23C256EAC ROM uPD23C256EAC No percussions Percussion Generator MSM6294 Pin 19 Clock Pulse Generator Waveform 4 i Percussion Filter Emitter of T12 CPU 5 6293 ROM uPD23C256EAC Demo music cannot be played Demo Music ROM MSM5268 RAM uPD43256C CPU MSM6293 ROM uPD23C256EAC Certain keys or switches do not respond 1 Dirty contacts Sampling impossible Microphone E Sampling Circuit Collectors of T28 and T29 CPU MSM6293 RAM uPD43256C 18 pe 3 T TT T T 0 0 0 0 0 0 a 7 PARTSLIST SK 5 Notes 1 Prices and specifications are subject to change without prior notice 2 for spare parts or
22. n for initializing the internal circuit 2 CLK In Clock pulse 256 kHz input 3 _ No function 4 WR In Write signal input LOW active The LSI reads the percussion data from the CPU when the terminal is LOW level 5 CS In Chip select signal input Fixed at LOW level 6 3 0 07 In Data bus DO D7 14 DVSS Ground OV source for internal digital circuit 15 16 No function 17 AVSS Ground QV source for internal DAC 18 MIX O Out Analog percussion signal output 18 AVDD 5 source for internal DAC 20 27 No function 28 DVDD 5V source for internal digital circuit E ect 8 MELODY CIRCUIT AM i Melody or 68K Obbligato s A ix Melody or 47K Bass J Pitch 2 5V 220K De Envelope EF 5 OUT lt 28C1740LNSR lt 1 lt MU z Gain Controller n 3 a 15K o Pitch SH I 22 Envelo e 0 4 D 5 AB a CA91A02 MSM6283 CPU outputs four each of pitch and envelope signals Normally all the signals are for melody sounds however when the demonstration music is played each pitch and envelope signals become obbligato bass chord or melody sounds CA91A 02 contains four mixing amplifiers and merges each pitch and envelope signals Gain Controller balances the sound volume of melody and accompaniments for demonstration music Signal KO14 normally stays HIGH level so that all the switches
23. r R 20 100K J T24 T 14 20 C 1 5W 100Kohm 5 2617 0168 Carbon film resistor R 20 220K J T24 T 4 120 1 5W 220Kohm 596 2617 0203 Carbon film resistor R 20 470K J T24 T 1 20 C 1 5W 470Kohm 596 2617 0206 Carbon film resistor R 20 39K J T24 T i 1 120 C 1 5W 39Kohm 5 2617 0238 Carbon film resistor R 20 680 J T24 T 1 20 1 5W 680ohm 5 2617 0246 Carbon film resistor R 20 12K J T24 T 1 20 c 1 5W 12Kohm 596 2617 0262 Carbon film resistor R 20 120K J T24 T 3 20 1 5W 120Kohm 5 2617 0289 Carbon film resistor R 20 15K J T24 T 6 120 1 5W 15Kohm 5 2617 0297 Carbon film resistor R 20 22K J T24 T 2 20 1 5W 22Kohm 5 2617 0301 Carbon film resistor R 20 56K J T24 T 6 30 C 1 5W 56Kohm 5 2617 0343 Carbon film resistor R 20 390K J T24 T 1 120 C 1 5W 390K ohm 5 2617 0378 Carbon film resistor R 20 3 9K J T24 T 1 120 1 5W 3 9Kohm 5 2617 0394 Carbon film resistor R 20 680K J T24 T 1 20 1 5W 680Kohm 5 2617 0459 Carbon film resistor R 20 27K J T24 T EE 20 1 5W 27Kohm 5 2617 0467 Carbon film resistor R 20 68 J T24 T 4 20 C 1 5W 680hm 596 Note New parts Rank A Essential Q ty Quantity used per unit Minimum order and supply quantity 20 Stock recommended Others X No stock recommende
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