Casio SK-8 User's Manual
Contents
1. Eur I LE LE IE LE E LE LE E dE UH NUAL TS L S without price ELECTRONIC KEYBOARD CARABIC MAR 1987 AES E Coon s lt cd CONTENTS 1 SCHEMATIC DIAGRAM 1 1 Main M3123 MAIM 1 1 2 Console M3123 CNIM 2 1 3 LED PCB M3123 LD1IM 3 1 4 Keyboard M3129 KY1M 4 2 VIEW amp MAJOR CHECKPOINTS 5 3 MAJOR WAVEFORMS 6 4 BLOCK DIAGRAM FERT 7 5 KEY amp SWITCH 8 6 CPU MSM6283 05GS 9 7 PERCUSSION GENERATOR 5 6294 02 11 8 MELODY CIRCUIT 12 9 SAMPLING CIRCUIT 13 10 PERIPHERAL DEVICE ACCESS 14 11 ROM PACK ACCESS 15 12 LED DRIVE CIRCUIT2. T D STE TEL S E 4 SK 8A Prices and specifications are subject to change without prior notice As for spare parts order and supply refer to the GUIDEBOOK for Spare Parts Supply published separately The numbers in item column correspond to the same numbers in drawing mp ur UP UP UP UP M M Code No Be GRY Ree Part am E CE 1 Specification Unit Price Q ty Yen XY Rank FOB JAPAN 1 M3123 MA1M PCB ASS Y 2010 0532 LSI Percussion LSI x 5 6294 02 1 2010 1946 LSI RAM x UPDA3265C 12L 1 20102247 LSI CPU MSM6283 05 I A 20102401 LSI ROM uPD23C256EAC 030 1 2101 6039 C MOS IC 8 40668 p 2105 0392 C MOS IC x uPD74HC32C 1 110 A Yt 2105 0532 C MOS IC 4969 1 110 x 2114 0252 Monolithic IC CA91A02 1 2120 8329 Linear IC Power Amp 4138 1 77 x 2251 0119 Transistor 25B1268 9 1 5 A 2220 6616 LED LN2G 1 10 A 2765 0315 Semi fixed resistor x V6EK PVB5K 1 0 B 2765 0364 Slide VR EWA MFOX25814 1 2 B fr 2845 0203 Module capacitor x CNBA4X221K 1 10 C 34 2898 0021 Trimmer capacitor VCTB4K911A 1 5 8 i 35 3501 0035 DC jack 2305 01 050 1 10 36 3612 0665 Jack Y B21 5005 1 B 37 3612 0711 Miniatur
3. ERROR EME a MAIM JA 5 JA 5 SE ERR 3 MAJOR WAVEFORMS Notes Photographs of waveforms have been taken using a memory scope Attenuation Radio of probes RESET signal When AC adaptor is inserted 0 2 div 0 1 sec div 3 CPU clock 4 Percussion Generator Clock 0 2 div 0 5us Signal MI At Power ON 0 2V div 6 Melody Circuit Output Tone Pipe Organ Key C2 5O0mV div 1ms div uh lb u M 499590 Eu 1112 15 401390 WOH duly 3 0 10414109 LLL 6 HS 9GcEpOdn OS DE 222 JS 43 JS 33 GENRE 491114 duos ESZOWSW 43 49 OJ1u02 sseJppv GLV OV DON v6c9INSIA sng eeg 0 001 14 04 E 1018 9 195 0155 3494 8 4 11 LELOM 009M 539 211 R Add 1 5431 uP 23 256 4 BLOCK DIAGRAM 5 KEY amp SWITCH MATRIX KI1 KOO KOT Piano KO2 Trumpet 3 au Memory 4 Stop sample Normal KO6 Rock 1 EE KO7 16 Beat Slow KOS Rock KO9 Play KO10 K O1 1
4. J D TD TD Am 4 Code No 23 24 725 29 30 31 32 Note 6909 5270 6909 5500 6909 5880 6909 5890 6909 5511 6910 0140 6907 0270 6908 6071 Part Name CN spacer A CN spacer B SL contact 128 SL contact 12D Upper case sub ass y Blind NM stopper B32 NM stopper A32 8 MIC 129 55 3830 9021 6907 0321 Condenser microphone Sponge 9 KEYBOARD ASS Y 6907 0150 6907 0160 6907 0300 6907 4551 6909 5520 69117552 6912 1182 6902 6261 White key set NW Black key set NW Contact rubber NW Shield plate 129A LED panel Pack cover Cover spring Stopper rubber 90 10 BUTTON SET 6909 5480 Button set 121 11 LOWER CASE ASS Y 6912 5843 6909 5451 6909 6720 6902 6690 6912 2630 6345 2238 Battery cover sub ass y l ower case sub ass y Shield plate 121A Rubber foot A Battery spring 120 Battery spring G55 12 OPTION ROM PACK 6902 0002 6903 5301 6905 3330 6905 3340 6909 5320 6903 5312 Inter connector Decorative panel Earth contact B Earth spring B Label ROM pack case New parts O ty Quantity used per unit Minimum order and supply quantity Unit Price Specification Q ty x Yen Rank FOB JAPAN M43220 1 1 20 C M43221 1 1 20 C 5 125 2 10 CSB 12D 1 10 B 21704 1 1 e M4499 1 1 120 X M42061 1 1 1 10 C
5. Note New parts Hank Essential Q ty Quantity used per unit i Minimum order and supply quantity ery Sa eA TET y OL Unit Brice Item Code No Part Name Specification N R Yen Rank JAPAN i j 2617 0061 Carbon film resistor R 20 2 2K J T24 T 7 me 4 1 SW 2 2K ohm 596 2617 0095 Carbon film resistor R 20 1G6K J T24 T 17 120 1 5W 10i ohm 45 2617 0109 Carbon film resistor R 20 33K J T24 T 2 20 d i 1 5W 33K ohm 5 2617 0117 Carbon film resistor x H 20 A7K J T24 T 8 120 0 1 5W 47Kohm 5 i 2617 0125 Carbon film resistor R 20 68K J T24 T 7 20 1 5W 68KKohm 5 2617 3 j Carbon film reststor H 20 82K J T24 T 2 20 ne 1 5 82Kohm 5 2617 0141 Carbon film resistor 20 1008 24 14 20 x 1 51 190K ohm 45 2617 0168 Carbon film resistor R ZO 220K J T24 T 4 20 x ge 1 8 220K ohm 25 2617 0203 Carbon film resistor R 20 470K J T24 T 1 120 ZEE 1 5W 470K ohm 596 2617 0206 Carbon film resistor R 20 39K J T24 T 1 70 i 1 5W 39Kohm 5 2617 0238 Carbon film resistor H 20 680 J T24 T 1 20
6. 16 13 RESET 8 POWER ON OFF DETECTION CIRCUITS 17 14 POWER SUPPLY CIRCUIT RE E EROR EE 18 15 TROUBLESHOOTING oes 19 PARTS LIST 20 27 U d Wi 1 U H U 1 u 155254 155254 I SCHEMATIC DIAGRAM 1 1 Main PCB M3123 MA1M To Key amp Switches C 1 AAA pe 6 3v22pu SEE e xsscsssssS5ssss x x x x x x x x x x x x x x x x T ee CI54 84 10220 ulse Generator 10K i j 5 SKHZ C56NPO Power CUZ i Amp P C41 Petch amp spion 5 Percussipn C151NPO I Filter 5 vi C8221H1 ER 2 e LIS Power ON Detector L x olo 15 casout 04551 E 1 VLA 16 13 07 x MIXOUT 05 i avon Erg 1 MIXIN 03 2 e 2 S 02 0 3 pi 12 4 R Mixing Amp 00 J 5 0072 N 002
7. K12 Vibra phone Pipe Organ Sample 2 Memory Start Sample Long Rock 2 March Waltz Record Accomp KI3 4 15 16 KI7 KI8 F1 51 G 1 Dog Surf A1 B1 G2 Chorus Flute C 2 D2 D 2 E2 eee ih ee F 2 G2 622 Edit A2 2 2 C3 D3 73 Disco 1 Disco 2 F3 Fro G3 3 Bossa Nova Samba A3 AF3 B3 C4 Sample Sample Sample 6 Pad 1 Pad 2 Pad 3 Pad 4 Power Demo Tempo 7 y A Rhythm Pad Obbligato Melody i Hi Low Lion Dog Bongo Bongo 6 CPU MSM6283 05GS O Generates Pitch and Envelope signals for Melody Chord Bass and Obbligato sounds Controls Keys Switches and peripheral devices The following table is the pin functions of the CPU M Pin No Terminal Name Function In Out 1 5V source for internal ADC Analog to Digital Converter 2 Ground source for internal 6 E No function 5 11 In Out Data bus DO 06 m 12 Address bus 0 13 Data bus D7 14 Address bus A1 NOM Chip enable signal for memory devices LOW active 16 18 Address bus A2 A3 A10 No function l 20 29 Address bus A4 A9 11 A14 30 Output enable signal for memory devices LOW active 31 Write enable signal for RAM LOW active 32 38 35 No function 39 CB Out Write ena
8. 1 5W G80ohrn 3596 2617 0246 Carbon film resistor R 20 12K J T24 T x j 20 C 1 5W 12Kohm 55 2617 0262 Carbon film resistor R 20 120K J T24 T 3 20 C 1 5W 120Kohm 5 x 2617 0289 Carbon film resistor R 20 15K J T24 T 5 20 lc SW 15Kohm 38 2617 0297 Carbon film resistor R32022KJ 124Y 2 120 1 5W 22 amp 5 2617 0301 Carbon film resistor R 20 b6K J T24 T x 6 120 1 5W 56Kohm 35 2617 0335 Carbon film resistor R 20 56 J T24 T 1 20 C 1 5W 560hm 5 2817 0343 Carbon film resistor R 20 380K J T24 T 1 0 amp 1 5W 390Kohm 1 596 2617 0378 Carbon film resistor R 20 3 9K J T24 T 1 20 C 1 5W 3 9Kohm 25 2617 0394 Carbon film resistor R 20 680K J T24 T 1 5 680K ohm 25 1 2617 0459 Carbon film resistor R 20 27K J T24 T 1 5W 27Kohm 4500 2617 0467 Carbon film resistor R 20 68 J T24 T C a 1 5W 68o0hm 5 Note New parts Bank Essential Quantity used per unit zs pisi recommended x Minimum order and supply quantity 2 m TE dct guum Ne Unit Price Item Code No Part Name Specification N R Yen X COPINE EERTE LENEA SE sss FOB JAPAN 2617 0491 Carbon film resistor R
9. si E CS VLI 5 32200 OUT 3 Ig 25170561 pute om 3 RD 5 INC P z EL 7 TEST E lt m h Bun RESET 1 POO I3 w z o F Percussion 4 1 C104 1 5 Generator Jd J F I e 4 gt OD co na 5 Obbligato 2 0 C4731H1 J 3 1 m 5 5 C4731H 2 5 O x m 5 d Melody Circuit 06 y No 10 C1031H lt Nw f gt gt gt TCA066BP 13 4 Vt na 5 Gain Controller m CA91A02 E 6 3220 Chord a Sean i 2 C47310H A VC I O VD ui 25 2517201 NSR 473 1 gt VX m i a 5 wo 0 6 Melody M C104 HI E Power I dd RCA Filter pee 100K 100 100 I TCT amp HC32P L JB 70 1 CN 79 2 15 2 25 1623 T CNZ JD 5 CN2 To JD 6 1027 T NZ JD 8 T CN Pack 0 5 1 CN2 858955 4 10 N x x xix x xix o JD 11 JD 11 CNZ 8838 9 x x x lt v 25 21E AC T 189104 002 VDD e V x S or z PERC
10. ROM uPD23C256EAC No chord bass and obbligato CA91A02 Emitter of transistor T11 Pin 2 Speaker terminal red wire No melody chord bass and obbligato percussion sounds Emitters of T14 and T15 Gain Controller CPU uPD23C256EAC Pin 11 of TC4066 No percussions Percussion Generator 5 6294 Pin 19 Clock Pulse Generator Waveform Percussion Filter Emitter of T12 CPU MSM6293 ROM uPD23C256EAC ROM packs cannot be palyed ROM Pack RAM uPD43256C CPU MSM6293 ROM uPD23C256EAC Certain keys or switches do Dirty contacts not respond Broken or poor soldered PC Joiner Sampling impossible Microphone Sampling Circuit CPU MSM6293 RAM uPD43256C 3 Collectors of T28 and 9 T m TTL ag TET m SK 8 Notes 1 Prices and specifications are subject to change without prior notice 2 As for spare parts order and supply refer to the GUIDEBOOK for Spare Parts Supply published separately 3 Thenumbers in item column correspond to the same numbers in drawing Unit Price Code Part Name Specification Q ty N R Yen XY Rank FOB JAPAN 1 M3123 MA1M PCB ASS Y 2010 0532 LSI Percussion LSI MSM6294 02 1 A 2010 1946 LSI RAM 432656 121 1 A 2010 2247 LSI CPU MSM6283 05 1 A 2010 2394 LSI ROM 23 256 029 1
11. 7 amp Dog Surf SAMPLEZ Tune 7 KI 12 3 KI2 Trumpet Pipe Organ SAMPLES PADI PAD2 SAMPLE LONG KI4 STOP Chorus Fiute SAMPLES PAD3 SAMPLE NORMAL 7 e o 5662928362 8 3 0 1 3 1 28 11 3 u orc 0 0 Bm ol or 8301 2 L 6 9 B 6 2 s07 9 s r 9 2 07 zo 9 9 2 B 9 5r 5 0 s or V 001 m m m Z CN lt 2 T 1 CL m 00 Ci e 5 Y N o gt ea A LLI T m Ti Ti T T fT TT 6 1 iM Y C6 1 1 G Keyboard PCB M3129 KY 1M 1 4 f lt lt l lt o O O O O O O O O Q 11 dg dm m 2 PCB VIEW amp MAJOR CHECKPOINTS ten Ste e P USES b b b b lu b diuini M
12. M32043A 2 1 110 C WM 034CY 1 M42612A 1 1 20 M1843 1 1 6 M1844 1 1 C M31953 1 1 8 M21391A 1 1 X 21668 1 I C M31665B 1 1 C M42359B 1 1 50 M41213A 1 1 10 8 M32676 1 1 C 21708 1 1 C M31417C 18 1 M21733 1 1 5 X M41361 1 4 10 M42382 1 1 20 C 42606 1 1 10 0 M4950B 1 1 41672 1 1 C M42470 1 1 20 M42469 1 1 20 C LABEL 456D 1 20 C M41716B 1 1 C Rank Essential i BO B Stock recommended Others X No stock recommended ENS M64 1 PCB Ass y M3123 LD1M PCB Ass y M3129 KY 1M PCB Ass y 55 994 INLVIW EZIEIN 85 p JAJA 1 SNI This Service Manual was scanned by 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
13. Melody Guidel CPU KIS MSM6283 05GS h a e Power ON OFF Detection anas Circuit Power Supply Circuit VD RS Power ON Power OFF v Reset ses Circuit y INoise i 4 Killer sm r cf sm mwa was u w s s s M When the power switch is turned on terminal MI receives a DC7 SV application differential pulse which triggers CPU operation By receiving signal KO9 from 1 4 or terminal CPU descriminates the Mode switch position Since stays at 45V even power switch is turned off or at the APO Auto Power Off the reset signal appears only when LP new batteries are set or an AC adaptor 15 inserted The noise killer circuit eliminates negative portion of signal CPU reset MI at Power OFF S 8053 is a voltage detector which observes VA 5V When voltage V becomes less than 2 8V output pin 1 provides LOW level to turn T13 on Receiving HIGH level from RESET terminal CPU stops its functioning Voltage down o VA 1 QUT 2 VDD 3 10 i 3 VSS 2 80V 1 DD OUT RS Bottom View G S 8053 001 Cut by Noise Killer mm m m m m m m m m m TJ 14 POWER SUPPLY CIRCUIT DC7 5V Input O VH 7 5V 7
14. ox 2813 0658 Semi conductive capacitor RT C5OTKYR822K T 1 20 C 2818 2164 Ceramic capacitor RT HES90TIKCH 151J T 1 110 C 2018 3241 Ceramic capacitor RT HESOTKCH 101J T 2 10 0 x 2818 3330 Ceramic capacitor RT HEGOTICCH560J T 1 20 C 2619 0379 Ceramic capacitor RI HEAOTKYB151K T 110 C 2819 0450 Ceramic capacitor RT HE7OTKSL221K T 1 10 2819 C565 Ceramic capacitor RT HE9O0TKSLA71K T 1 10 2819 5362 Semi fixed capacitor DD406SR473K 16 T 6 20 C 2830 6211 Mylar capacitor AMZV 154K50 T 1 10 38 3841 0007 Coil L10P 7L 1 10 x B 4307 7380 11249 1 1 X x Note 2 New parts Hank Essential Q ty Quantity used per unit _ x Minimum order and supply quantity mac mended NN TY TI Item Code No Part Name Specification Q ty Rank FOB JAPAN 2 M3123 CN1M PCB ASS Y 2301 0097 Diode 152473 6 20 0 39 2320 9764 LED LN251RPP WE 1 110 B 3725 0854 PC joiner M123B JF F00 25 60M 1 110 B 4307 7390 Blank PCB M3123 CN 1M M11250 1 1 X 3 M3123 CN2 ASS Y 3725 0861 PC joiner M123D 11 115 1 110 5 4307 7400 Blank PCB M3123 CN2 M43274 1 1 110 X 4 M3123 LD1M ASS Y w 2320 9756 LED LN38GPH 13 120 B 2320 9748 LED L N28RPH 19 20 B yt 3 25 0847 PC joiner M 123C JFFOO
15. 1 Key input signals Reset signal for Percussion generator The terminal holds LOW level at power ON for a while during which the internal circuits of the Percussion generator are initialized 00 86 88 PO3 Out LED common signals output 89 EH Out Melody envelope signal output 90 Out Melody or obbligato envelope signal output 91 EF Qut Melody or chord envelope signal output d 92 Melody or bass envelope signal output 93 SH Qut Melody pitch signal output 94 Qut Melody or obbligato pitch signal 95 SF Melody or chord pitch signal 96 SE Qut Melody or bass pitch signal ES No function 5 source for DAC Digital to Analog Converter 99 VDAC Ground OV source for DAC Sampling sound input signal from MIC terminal FCK1 E al m 24 4t rr __ P eee 2t 21 41 iine 14 ddress CS f _ 31 OE WE 31 100 107 D Data CPU Data into RAM y Sampling As a read clock Read Cycle pulse refresh Write Cycle pulse refresh Floating Cycle pulse refresh 1 14PG 802 2 Timing chart of sampling CPU for ROM and RAM exa 7 PERCUSSION GENERATOR 5 6294 02 Containing a internal ROM 128 Kbit for percussion data a
16. 14 100 110 B w 4307 7450 Blank PCB M3123 LD1M 11249 2 1 110 X 5 M3129 KY1M ASS Y 2300 2086 Diode 155254 32 120 3725 0868 joiner M123A JFF00 12 125M 1 10 B 4307 5041 Blank PCB M3129 KY 1M M21332A 1 1 X 6 64 1 ASS Y Yr 2010 0714 LSI MSM 5268 50GK K 1 2818 2040 Ceramic capacitor 70 1032 C 4307 2131 Blank M64 1 41686 1 7 UPPER CASE ASS Y 1 3331 0070 Speaker EAS 8P109T B 2 6909 5180 Slide VR knob M32610 1 B 3 6909 5210 Contact rubber 121A M43215 1 B 4 6909 5220 Contact rubber 121B 43216 1 B 6909 5230 Contact rubber 1210 M43217 1 B 6 6909 5240 Contact rubber 1210 M43218 1 B 7 6909 5252 DS contact rubber 121 M326118 1 B 8 6909 5260 SA rubber button M320612 1 C Note New parts Rank Essential Q ty Quantity used per unit B Stock recommended Minimum order and supply quantity Others X No stock recommended NS 1 Unit Price Part Name Specification Q ty Yen X FOB JAPAN Code No a UP L LE 6909 5270 CN spacer M43220 1 6909 5880 SL contact 12S CSB 12S 6909 5890 SL contact 12D CSB 12D 6909 5341 Upper case sub ass y M21704A 2 6910 0140 Blind M4499 1 6907 0270 NM stopper B32 M42611 1 6908 6071 NM stopper A32 M32043A 2 8 MIC 129 ASS Y 13 3830 9021 Condenser microphone WM 034CY 14 6907 032
17. 2101 6039 C MOS IC 8 40668 1 2105 0392 C MOS IC uPD74HC32C 1 10 A 2105 0532 C MOS IC 1 4969 1 110 2114 0252 Monolithic IC CA91A02 1 2120 8329 Linear IC Power Amp LA4138 1 A 22510119 Transistor 25 126 5 115 2320 9616 LED LN2G 1 10 B 2765 0315 Semi fixed resistor V6EK PVB5K 1 20 B 2765 0364 Slide VR EWA MFOX25B14 1 5 B 2845 0203 Module capacitor CNB4X221K 1 0 0 2898 0021 Trimmer capacitor VCT84K911A 1 5 B 3501 0035 DC jack HEC2305 01 050 1 110 36 3612 0665 Jack YKB21 5006 1 B 37 3612 0711 Miniature jack YKB21 5101 2 5 3850 1216 MOS IC S8053AL R 1 A 2200 3721 Transistor 25A933 SQ 2 10 A 2220 1425 Transistor 2SC1740LNSR TP T 11 10 E 2250 0007 Transistor 25 934 1 110 x 2220 2632 Transistor 25620608 1 10 DOW 2250 0231 Digital transistor 25 1623 20 2252 0245 Digital transistor 25 4216 20 2300 2086 Diode 188254 20 0 2606 0049 Carbon film resistor R 20 100 G T24 T 20 C 1 5W 1000hm 2 f 2606 0483 Carbon film resistor R 20 4 7K G T24 T 20 C 1 5W 4 7K ohm 2 2606 0532 Carbon film resistor H 20 10K G T24 T 20 1 5W 10Kohm 296 1 2617 0028 Carbon film resistor R 20 100 J T24 T 20 C 1 5W 1000hm 596 2617 0044 Carbon film resistor R 20 560 J T24 T 20 C 1 5W 560ohm 5 i 2617 0052 Carbon film resistor R 20 1K J T24 T 20 0 0 1 5W 1Kohm 596
18. GND VL1 GND VL2 GND M VD Sampling Sound B 2 501746 0LNSR 61021 QSCI740LNSR 688 EE C4131H1 C102 HI1 3 VLI Circuit E CC E I t HIC pey o MIC T z RETE EM ul p 0 1 2 Console 3123 1 5 B E 2 3 L Kl 2 5 POWER OFF Rock 1 Rock 2 N KI pd PLAY Disco 1 Disco 2 MEMORY START 2 516 March x TEMPO 2 i 4 3 K RSIS s AUTO PLAY Bossa Nova Samba tempo V MELODY GUIDE Slow Rock Waltz MEMORY STOP HEN KI 1 1 pen G H I J K ca 4588 o 9 5 2 8 518 8 5 x x lt Z a Z L lt lt KI4 EDIT 12 KI KIB O 0 0 6 E f START Piano Vibraphone SAMPLE Tune 4 1 K14 2
19. 1 Sponge 42612 1 zi 9 KEYBOARD ASS Y 4 15 6907 0150 White key set NW M1843 1 C 16 6907 0160 Black key set NW M1844 1 C 17 6907 0300 Contact rubber NW M31953 1 B 13 6907 4851 Shield plate 129A M21391A 1 X 7 19 6909 5350 LED panel M21668 2 20 6911 7552 Pack cover M31665B 1 C 21 6912 1182 Cover spring M42359B 1 22 6902 6261 Stopper rubber 90 M41213A 1 C 10 BUTTON SET 3 6909 5200 Button set 3 M32677 1 i 7 11 LOWER CASE ASS Y 24 6905 8343 Battery cover sub ass y M31417C 8 425 6909 5171 Lower case sub ass y M2836 66 29 6909 6720 Shield plate 121A M21733 1 30 6902 6690 Rubber foot 41361 1 x 31 6912 2630 Battery spring 120 M42382 1 32 6345 2238 Battery spring G55 42606 1 12 OPTION ROM PACK 6902 0002 Inter connector M4950B 1 5903 5301 Decorative panel 41672 1 6905 3330 Earth contact 42470 1 6905 3340 Earth spring B M42469 1 6909 9070 Label LABEL 555A 5903 5312 ROM pack case M41716B 1 5 Note New parts na Rank A Essential Quantity used per unit Stock recommended d Minimum order and supply quantity Others a X stock recommended xc 64 1 Ass y M3123 LD1M PCB Ass y M3129 K Y 1M PCB Ass y M3123 MA1M PCB Ass y 0 TL
20. 20 330K J T24 T 1 20 C 1 5W 330Kohm 45 2617 0505 Carbon film resistor R 20 33 J T24 T 1 20 C 1 5W 33ohm 55 2617 0877 Carbon film resistor R 20 8 2K J T24 T 1 20 1 5W 8 2K ohm 596 Yr 2801 7189 Electrolytic capacitor 50RE2 R33 Ti4 T 4 20 C 2804 5956 Electrolytic capacitor 5ORE2 2R2 T2 T 2 10 C 2805 3061 Electrolytic capacitor 6 3RE2 220 T2 T 3 10 2805 3100 Electrolytic capacitor I6RE2 10 T14 T i 10 28017301 Electrolytic capacitor 6 3 100 1 20 2804 4801 zlectrolytic capacitor 16852200 1 10 C 2805 3142 Electrolytic capacitor 16RE2 10 T2 T 2 20 C 2307 1082 Electrolytic capacitor 16R 2 100 T2 T 2 10 2807 1104 Electrolytic capacitor 6 38 2 100 14 1 20 C i 2807 1112 Electrolytic capacitor 1ORE2 100 12 T 2 20 2807 1121 Electrolytic capacitor 10RE2 220 T2 T 2 120 2307 1155 Electrolytic capacitor 5ORE2 1 Ti4 T 3 20 C 2807 1180 Electrolytic capacitor 10RE2 47 T2 T 3 0 2813 0245 conductive capacitor RT CBOTKYR103K T 9 20 C 2813 0254 semi conductive capacitor 223 2 20 C 2813 0525 Semi conductive capacitor RT CBOTKYR682K T 1 20 C 2813 0560 Semi conductive capacitor DD408SR 104K 16 T 11 20 C 2813 0644 Semi conductive capacitor RT C40TKYR102K T 5 0 om Yr 2813 0651 Semi conductive capacitor RT CAOTKY R332K T 1 120 C
21. 20 47K J T24 T 8 20 1 5W 47Kohm 5 2617 0125 Carbon film resistor R 20 68K J T24 T 7 20 1 5W 68Kohm 45 2617 0133 Carbon film resistor R 20 82K J T24 T 2 20 1 5W 82K ohm 5 2617 0141 Carbon film resistor R 20 100K J T24 T 14 20 1 5W 100Kohm 596 2617 0168 Carbon film resistor R 20 220K J T24 T 4 120 1 5W 220K ohm 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 1 120 C 1 5W 39Kohm 5 2617 0238 Carbon film resistor R 20 680 J T24 T 20 G 1 5W 6806 5 2617 0246 Carbon film resistor R 20 12K J T24 T 1 120 C 1 5W 12Kohm 596 2617 0262 Carbon film resistor R 20 1 20K J T24 T 3 20 C 1 5W 120Kohm 5 2617 0289 Carbon film resistor R 20 15K J T24 T 5 20 G 1 5W 15Kohm 25 2617 0297 Carbon film resistor R 20 22K J T24 T 2 20 C 1 5W 22 5 2617 0301 Carbon film resistor R 20 b6K J T24 T 6 20 1 5W 56K ohm 1596 2617 0335 Carbon film resistor R 20 56 J T24 T 1 20 C 1 5W 5 56170343 ben R 20 390K J T24 T 1 20 C 1 5W 390IKKohm 5 2617 0378 Carbon film resistor R 20 3 9K J T24 T 120 C 1 5W 3 9Kohm 5 2617 0394 Carbon film resistor R 20 680K J T24 T 1 20 1 5W 680K ohm X596 2617 0459 Carbon film resistor R 20 27K J T24 T 1 20 C 1 5bW 27Kohm 596 2617 0467 Carbon film r
22. 3 20 e 2807 1180 Electrolytic capacitor 10 2 47 2 3 120 2813 0245 Semi conductive capacitor RT C50TKYR103K T 9 20 C 2313 0294 Semi conductive capacitor RT CGOTKY R223K T 2 20 C 2813 0525 Semi conductive capacitor RTI CBOTKYR682K T 1 120 C 2813 0560 Semi conductive capacitor DD408SR 104K 16 T 11 20 C 2813 0644 Semi conductive capacitor RT CAOTKYR102K T 5 20 gt 2813 0651 Semi conductive capacitor RT C40TKY R332K T 1 20 C 2813 0658 Semi conductive capacitor 5 R822K T 1 20 2818 2164 Ceramic capacitor RT HESOTKCH151J T 1 10 2818 3241 Ceramic capacitor RT HEBOTKCH101J T 2 10 C 2818 3330 Ceramic capacitor RT HEGOTIKCH560J T 1 20 C 2819 0379 Ceramic capacitor RT HEAOTKYB151K T 1 10 C 2819 0450 Ceramic capacitor RT HE7OTKSL221K T 1 10 C 2819 0565 Ceramic capacitor RT HESOTKSL471K T 1 10 C 2819 5362 Semi fixed capacitor DD406SR473K 16 T 6 20 C 2830 6211 Mylar capacitor 154 50 1 110 0 3841 0007 Coil L10P 7L 1 10 B 4307 7380 Blank M3123 MA1M M11249 1 1 X Note New parts Rank Essential m Quantity used per unit B Stock recommended x Minimum order and supply quantity 7 22 TT 2 28 Item Code No Part Name Specification 2 M3123 CN1M PCB ASS Y 2301 0097 2320 9764 3725 0854 4307 7390 Diode LED PC joiner M123B Blank PCB M3123 CN1M 3 M3123 CN2 PCB ASS Y 3725 0861 PC joiner M123D 4
23. 307 7400 Blank PCB M3123 CN2 4 M3123 LD1M ASS Y 2320 9756 2320 9748 3725 0847 4307 7450 LED LED PC joiner M123C Blank PCB M3123 LD1M 5 M3129 KY1M PCB ASS Y 2301 0241 Diode 3725 0868 PC joiner M123A 4307 5041 6 M64 1 2010 2254 2818 2040 4307 2131 Blank PCB M3129 K Y 1M PCB ASS Y LSI Ceramic capacitor Blank PCB M64 1 7 UPPER CASE ASS Y 3831 0070 6909 5180 6909 5210 6909 5220 6909 5230 6909 5240 6909 5252 6909 5490 w New parts Speaker Slide VR knob Contact rubber 121A Contact rubber 121B Contact rubber 121C Contact rubber 121D DS contact rubber 121 SA rubber button Q ty Quantity used per unit Minimum order and supply quantity 152473 LN251RPP WE JFF00 25 60M M11250 1 JFFOO 11 115 M43274 1 LN38GPH CS LN28RPH CS JFFO00 14 100 M11249 2 155254 77 JFF00 12 125M 21332 1 MSM 5268 55GS K HE70JY F103Z 41686 1 5 8 109 32610 1 43215 1 43216 1 43217 1 43218 1 32611 1 M32612 2 29 Q ty Unit Price Yen X FOB JAPAN 20 10 10 1 10 1 10 13 20 19 20 1 110 1 20 Rank A Essential B Stock recommended Others X No stock recommended Hank gt O X T TI DL D D Ty
24. 7 Kohm bias the sampling signal on 2 863V When the sampling sound level exceeds 0 315 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 RAM dic mom m m m m m m m m m QT TT TL TL TL TL TL ILL TL TL 10 PERIPHERAL DEVICE ACCESS PG 256kHz CPU 6 1 To oy T Co O O lt e CN uU a 5 x uPD23C246EAC Address bus AO A14 Data bus DO D7 uPD43256C 12L is a 256Kbit RAM for storing sampling sounds and ROM pack data The data in RAM are kept even power switch OFF as long as DC7 5V is provided uPD23C256EAC is a 2b56Kbit ROM and contains preset tone percussion data and system execution program MSM6294 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 RAM ROM Percussion generator H High level L Low level X Irrelevant _ 14 11 ROM PACK ACCESS Optional ROM pack 1 01 02 CP 4 4 071 CE2
25. E Bays 30 Alk 29 2 12 28 MX 1211 0301 d 27 MX 1231 0291 26 ai i em 1 T 12 WE A12 an pec A a7 26 67 as 2 Kas 6 6 25 AB Ing RESET AM AS Slas qd AS 5 AS F 2 Amm o r c C 20 AL M B lt u S kon T 2 0E 21 m 1 9 er H5H6283 A3 L A2 10 2 32 8 10 AS CS AL Les Koi 16 A0 10 ci 19 7 A0 10 a 2 Q 1 08 8 66 4 195 05 ce 5 100 106 100 11 50 2 1 101 12 17 105 101 12 BEC 1 02 1406 E 2 1 0 2 107 1 03 02 x K07 AD T oND 106 K05 100 0 ROM 105 1 101 a 8 K02 104 75 102 6 76 5 x zu 2 88 19 M NOISEE N M K12 W NO SE 8 o r 2 w gt TC74HC32P 1 Eq 2 2 8 2 2 1008 a 5 i 53 cit lt gt gt o gt 8 8 oZr oz gt e gt e 5 E 2 2 568 2 2K 11 p LC4969 1 a e o W VA 51 5 VDD GND VDD2
26. O VX 5V o VD 5V 3 35V o VL2 OV VA 5V VC 5V VDD1 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 T9 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 to shut off Voltages 5V and VDD1 ground are always provided to the CPU even at APO Transistors T1 2 and form a voltage regulator Using the LED characteristic of current regulation transistor T3 stabilizes the battery voltage at 5V and the darlington connected transistor 1 and T2 prevent over current in the circuits 18 For linear circuits For digital circuits 15 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 Detector Waveform 2 CPU MSM6293 Pulse Generator Waveform 3 ROM uPD23C256EAC No sound at all Power Circuit Voltages VA VX Waveform 1 Waveform 3 Reset Circuit Pulse Generator CPU MSM6293 ROM uPD23C256EAC Mixing Amp Power Amp LA4138 Speaker CA91A02 Filter CPU MSM6293
27. ble signal for Percussion generator LOW active 40 GND 5V source 41 CE ROM pack s chip select signal LOW active 42 No function 43 VDD1 Ground OV source for internal digital circuit 44 Ground OV source for internal analog circuit 46 47 CP1 CP2 Out i 49 52 0 03 Out 53 56 D4 D7 ROM pack s clock pulse ROM pack s data address change signal Data bus for ROM pack becomes data or address in accordance the voltage level of this signal Data bus for Percussion generator Data bus for Percussion generator and data address bus for ROM pack E 57 58 051 OSO In Out 7 277MHz clock pulse input 0 and output 59 In Power ON detection signal input HIGH active Receiving a pulse at Power ON CPU starts functioning 60 RESET In Reset signal input HIGH active The termina receives a pulse which resets CPU internal circuit when new batteries or AC adaptor is set No function 62 KO14 Out 63 3 Out Accompaniments volume control signal ROM and RAM chip select signal ines GR mmmmmmmmmm mm T T T Sampling CPU internal clack 64 12 Out Function APO Auto Power Off signal output Terminal drops to LOW level to shut the voltages off when the unit is not operated for approximately 00 minutes 65 76 11 00 Out Key common and LED drive signals outputs 77 84
28. e jack YKB21 5101 2 5 B x 3850 1216 MOS IC S8053ALR 1 A 2200 3721 Transistor 25A933 SQ 2 10 A 2220 1425 Transistor 25C1740L NSR TP T 11 110 A 2250 0007 Transistor 25 1 10 2 2220 2632 Transistor 25620608 1 11 2250 0231 Digital transistor 25 1623 3 20 amp 2252 0245 Digital transistor 28C4216 AC T 11 20 A 2300 2086 Diode 155254 20 20 C mad 2606 0049 Carbon film resistor R 20 100 G T24 T 2 20 C 1 5W 1000hm 2 2606 0483 Carbon film resistor R 20 4 7K G T24 T 1 20 1 5W 4 7Kohm 22 amp 2606 0532 Carbon film resistor R 20 10K G T24 T 1 20 1 5W 10K ohm 2 2617 0028 x Carbon film resistor 8 20 100 1 24 4 120 1 5W 1000hm 5 2617 0044 Carbon film resistor 20 560 724 1 20 x 1 5W 560ohm 5 2617 0052 Carbon film resistor R 20 1K J T24 T 7 ye 1Kohm ceu Kors New parts ENS 5 Q ty Quantity used per unit B Stock recommended Minimum order and supply quantity Others X No stock recommended cs Unit Price Item Code No Part Name Specification Q ty N R Yen X FOB JAPAN 2617 0061 Carbon film resistor R 20 2 2K J T24 T 7 20 1 5W 2 2Kohm 5 2617 0095 Carbon film resistor R 20 10K J T24 T 17 20 1 5W 10K ohm 4 5 2617 0109 Carbon film resistor R 20 33K J T24 T 2 20 1 5W 33Kohm 5 2617 0117 Carbon film resistor R
29. esistor H 20 68 J T24 T 4 20 C sw se Note New parts Hank A Essential O ty Quantity used per unit Stock recommended Minimum order and supply quantity C Others X No stock recommended m E _ fL TU d FP H mrmmmmmmmmommmmmmm EFAF AIF IF EE EF EE GE EU GE BH LE H H H Code No Part Name Specification Q ty N R Yen Tv Rank FOB JAPAN 2617 0491 Carbon film resistor R 20 330K J T24 T 1 20 1 5W 330Kohm 5 2617 0505 Carbon film resistor R 20 33 J T24 T 1 20 1 5W 33ohm 596 2617 0877 Carbon film resistor R 20 8 2K J T24 T 1 20 C 1 5W 8 2K ohm 5 2801 7189 Electrolytic capacitor 5ORE2 R33 T14 T 4 20 C 2804 5956 Electrolytic capacitor 5ORE2 2R2 T2 T 2 10 C 2805 3061 Electrolytic capacitor 6 3RE2 220 T2 T 3 1 30 C 2805 3100 Electrolytic capacitor 16RE2 10 T14 T 1 110 C 2801 7301 Electrolytic capacitor 6 3RE2 100 F 1 120 C 2804 4801 Electrolytic capacitor 16RE2200 1 10 C 2805 3142 Electrolytic capacitor 16RE2 10 T2 T 2 20 2 2807 1082 Electrolytic capacitor 16RE2 100 T2 T 2 10 2807 1104 Electrolytic capacitor G 3RE2 100 T14 T 1 0 0 2807 1112 Electrolytic capacitor 10RE2 100 T2 T 2 20 C 2807 1121 Electrolytic capacitor 10RE2 220 T2 T 2 20 C 2807 1155 Electrolytic capacitor 5DORE2 1 T14 T
30. i C1 C2 io OP e Q CPU m EN ee um 22 2 72 Wc s oe Data bus DO D 7 MSM6283 05GS eis ieu 1 gt amp K O13 WE Assigning ROM pack 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 07 carries data and address signal OP determines either the bus carries data or address Signal C1 and C2 are clock pulse for data transfer Address 2 5us 10us 2 HUUU UUUUUM 7 Dessus Y Ya Y l l 84 4 D DB Time Chart of Data Transfer m m m m T D TL D TO T TL T TL TT TL TL TL T m m m 12 LED DRIVE CIRCUIT CPU MSM6283 05GS N 500 eo VY e po r iT O JO eo D LOS p P KOG E S KO7 lt gt KO8 gt 2 lt gt KO10 C AM LEDs are controlled by signal POT PO3 KOO of the CPU For instance to light the LED G2 CPU falls signal PO3 at the timing of KOO 16 13 RESET amp POWER ON OFF DETECTION CIRCUIT n s x Play Record Auto Play
31. nd internal 8 bit DAC Digital to Analog Converter the LSI provides percussion sounds DO Data Bus X Z Percussion D7 CPU Out 1 Percussion MSM6293 Generator MSM6294 WR CET Percussion Filter Oscillator fg 256 KHz Pin Function of Percussion Generator Pin No Signal In Out Function 1 RESET In Reset signal input LOW active The terminal holds LOW level at power switch on for initializing the internal circuit 2 CLK In Clock pulse 256 kHz input d No function 4 WR In Write signal input LOW active The LSI reads the percussion data from the CPU when the terminal is L OW level 5 CS In Chip select signal input Fixed at LOW level 6 13 DO D7 In Data bus DO D7 14 DVSS Ground 0V source for internal digital circuit 15 16 No function 17 AVSS Ground OV source for internal DAC PENNE 18 MtX O Qut Analog percussion signal output 19 AVDD 5V source for internal DAC 20 27 No function m 28 DVDD 5V source for internal digital circuit E UR mmmmmmmmmmmmmm m Tn T TT T 8 MELODY CIRCUIT 14 2 5 1 Mixer Melody or Envelope 68K 19 o Obbligato P 2 5 1 o o 113 Pitch SE TI Melody or 14 _ Envelope EE Bass pu OUT 25V c o Mixer TI Melody or 2 5v 220K T Amp EF jos Gain Con
32. troller EN Ha Pitch 2 OS 3 Mixer Y s 4 Melody lk CAS1A02 C104 H MSM6283 652 H VL1 OV Filter CPU outputs four each of pitch and envelope signals Normally all the signals are for melody sounds however when a ROM Pack 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 ROM Pack musics Signal KO14 normally stays HIGH level so that all the switches turn on When a ROM Pack 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 xp 9 SAMPLING CIRCUIT Internal MIC CPU MSM6283 02Gs 1 External MIC MIC Amp Line in Circuit Sas FDL FA RR E NIC Fig 1 Sample Sound Input Circuit VC Sampling Sound Samoling Start Area Input Signal ANS ung cci 2 8 2 872V 0 315 1 Vin 2 557V a MEE 2 242V Sampling Start Area 0 8 sec Time Sampling Start 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
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