Casio SK-8 Service Manual & Parts List Download Page 1 | Manualshive

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Summary of Contents for SK-8

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Page 2: ...NTS 5 3 MAJOR WAVEFORMS 6 4 BLOCK DIAGRAM 7 5 KEY SWITCH MATRIX 8 6 CPU MSM6283 05GS 9 7 PERCUSSION GENERATOR MSM6294 02 11 8 MELODY CIRCUIT 12 9 SAMPLING CIRCUIT 13 10 PERIPHERAL DEVICE ACCESS 14 11...

Page 3: ...n p In o o o o olo o J J _l I Jl J J fiTunf T rnc ut i n n ci ci col co co I2SB12S6R J2SCn40LNSR gv IOV220M T Power a Amp 2Jv 2 2 JV C22I 138 10V47M Apo 50V2 2A IK 10KB _ MAIN VR 1 5j t Mixing Amp 5l...

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Page 5: ...1 2 Console PCB M3123 CN1M A B_j_C 0 E_j_F G H A B C D E F G H...

Page 6: ...J_j_K L M N_j_0 P 2 i 2 j 3 L 5 6 7 8 9 10 I ii i...

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Page 8: ...I iwr...

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Page 10: ...MAIM...

Page 11: ...P 2 PCB VIEW MAJOR CHECKPOINTS...

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Page 13: ...emory scope Attenuation Radio of probes 10 1 RESET signal When AC adaptor is inserted 0 2V div 0 1 sec div Signal Ml At Power ON 0 2V div Ims div 3 CPU clock Percussion Generator Clock 0 2V div 0 5ms...

Page 14: ...LED Driver Key Switches 4 BLOCK DIAGRAM...

Page 15: ...04 Memory Stop Memory Start Edit A2 A 2 B2 C3 K05 Sample Normal Sample Long C 3 D3 D 3 E3 K06 Rock 1 Rock 2 Disco 1 Disco 2 F3 F 3 G3 G 3 l 07 1G Beat March Bossa Nova Samba A3 A 3 B3 C4 l 08 Slow Roc...

Page 16: ...al for Percussion generator LOW active 40 GND 5V source 41 CE2 Out ROM pack s chip select signal LOW active 42 No function 43 VDD1 Ground OV source for internal digital circuit 44 VDD2 Ground OV sourc...

Page 17: ...while during which the internal circuits of the Percussion generator are initialized LED common signals output Melody envelope signal output Melody or obbligato envelope signal output Melody or chord...

Page 18: ...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 l...

Page 19: ...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 pitc...

Page 20: ...ing 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 tr...

Page 21: ...unds and ROM pack data The data in RAM are kept even power switch OFF as long as DC7 5V is provided pPD23C256EAC is a 256Kbit ROM and contains preset tone percussion data and system execution program...

Page 22: ...ly 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 Cl and C2 are clock pu...

Page 23: ...12 LED DRIVE CIRCUIT All LEDs are controlled by signal POI P03 and KOO K010 of the CPU For instance to light the LED G2 CPU falls signal P03 at the timing of KOO...

Page 24: ...ays 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 The noise killer circuit eliminates negativ...

Page 25: ...s 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 pro...

Page 26: ...Pin 2 Speaker Speaker terminal red wire No melody chord bass and CA91A02 obbligato percussion sounds Filter Emitters of T14 and T15 CPU MSM6293 ROM pPD23C256EAC No chord bass and obbligato CA91A02 Gai...

Page 27: ...nd 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 3 The numbers in item column corresp...

Page 28: ...1 5006 1 B 37 3612 0711 Miniature jack YKB21 5101 2 5 B 3850 1216 MOS 1C S8053ALR 1 A 2200 3721 Transistor 2SA933 SQ 2 10 A 2220 1425 Transistor 2SC1740LNSR TP T 11 10 A 2250 0007 Transistor 2SA934R 1...

Page 29: ...5 1 20 c 2617 0238 Carbon film resistor R 20 680 J T24 T 1 5W 680ohm 5 1 20 c 2617 0246 Carbon film resistor R 20 12K J T24 T 1 5W 12Kohm 5 1 20 c 2617 0262 Carbon film resistor R 20 120K J T24 T 1 5...

Page 30: ...tor 10RE2 47 T2 T 3 20 2813 0245 Semi conductive capacitor RT C50TKYR103K T 9 20 2813 02S4 Semi conductive capacitor RT C60TKYR223K T 2 20 2813 0525 Semi conductive capacitor RT C50TKYR682K T 1 20 281...

Page 31: ...e 1SS254 32 20 C 3725 0868 PC joiner M123A JFF00 12 125M 1 10 B 4307 5041 Blank PCB M3129 KY1M M21332A 1 1 X 6 IVS64 1 PCB ASS Y 2010 0714 LS MSM 5268 50GK K 1 A 2318 2040 Ceramic capacitor HE70JYF103...

Page 32: ...C 20 6911 7552 Pack cover M31665B 1 1 C 21 6912 1182 Cover spring M42359B 1 1 50 C 22 6902 6261 Stopper rubber 90 M41213A 1 1 10 C 10 BUTT OIN SET 23 6909 5200 Button set 123 M32677 1 1 C ID lowe R CA...

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Page 35: ...cations 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 The numbers in item column correspond to t...

Page 36: ...k YKB21 500S 1 B 37 3612 0711 Miniature jack YKB21 5101 2 5 B 3850 1216 MOS 1C S8053ALR 1 A 2200 3721 Transistor 2SA933 SQ 2 10 A 2220 1425 Transistor 2SC1740LMSR TP T 11 10 A 2250 0007 Transistor 2SA...

Page 37: ...617 0206 Carbon film resistor R 20 39K J T24 T 1 5W 39Kohm 5 1 20 C 2617 0238 Carbon film resistor R 20 680 J T24 T 1 5W 680ohm 5 1 20 C 2617 0246 Carbon film resistor R 20 12K J T24 T 1 5W 12Kohm 5 1...

Page 38: ...20 c 2807 1180 Electrolytic capacitor 10RE2 47 T2 T 3 20 c 2813 0245 Semi conductive capacitor RT C50TKY R103K T 9 20 c 2813 0294 Semi conductive capacitor RT C60TKYR223K T 2 20 c 2813 0525 Semi cond...

Page 39: ...0241 Diode 1SS254T 77 T 32 20 C 3725 0868 PC joiner M123A JFF00 12 125M 1 10 B 4307 5041 Blank PCB M3129 KY1M M21332A 1 1 X 6 M64 1 PCB ASS Y 2010 2254 LSI MSM 5268 55GS K 1 A 2818 2040 Ceramic capaci...

Page 40: ...panel M21668 1 20 6911 7552 Pack cover M31665B 1 21 6912 1182 Cover spring M42359B 1 22 6902 6261 Stopper rubber 90 M41213A 1 10 BUTTON SET 23 6909 5480 Button set 121 11 LOWER CASE ASS Y 0 132676 1 1...

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Page 43: ...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 wi...

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