Casio Realistic Concertmate 500, Service Manual

Page 1: ...CONCERTMATE 500 Catalog Number 42 4004 CUSTOM MANUFACTURED FOR RADIO SHACK A DIVISION OF TANDY CORPORATION...

Page 2: ...GRAM 5 CIRCUIT DESCRIPTION 6 MAJOR WAVEFORMS 14 TROUBLESHOOTING 16 PCB Top and Bottom Views 17 ELECTRICAL PARTS LIST 19 MECHANICAL PARTS LIST 25 EXPLODED VIEW DISASSEMBLY 26 1C AND TRANSISTOR LEAD IDE...

Page 3: ...rch samba bossa nova rhumba 4 beat swing slow rock waltz Ftll in key Tempo keys Concert chord maj min 7th min 7 Chord selector system maj min 7th min 7 maj 7 dim sus 4 aug 6th min 6 m 7 5 mM 7 Playbac...

Page 4: ...ound to not distort noticeably 7 Mic Input Sensibility at 1 kHz for sampling 8 Line Input Sensibility at 1kHz for sampling 9 Line Output Level with A3 key by sampling external 1 kHz a 4mV input at Mic...

Page 5: ...3 P 1ST c 0 OSSl Od w a s lUb VU A u 1P 0 CO sBlS S o to r 5 I s 11 i ri C I S w S 0 0 O h f 500 o 0 u 0 S f t il ffl iS i i M 50 0 9k O 1 S 2 S 8 2 W W z Oo 61 I I u6i mour 3 o 60 C 00 X I u6is oluu...

Page 6: ...Write signal output 1 When L the CPU writes data into the memory devices 32 1 RPSH 1 Out Refresh signal output When X the CPU refresh the memory data of RAMs 33 39 f r No function 40 gno Ground OV sou...

Page 7: ...1 1 Sample sound signal irtput Note Since this LSI functions as negative l 09ic OV is provided to VDD1 terminal while 5V source is appiied to GND terminal Keyboard Matrix KM 1 KI2 KI3 KI4 KIS KI6 KI7...

Page 8: ...e melody signal while they create melody obbligato chord and bass sounds individually at the other modes Note The waveforms are only for understanding the principle of the above circuit The actual wav...

Page 9: ...ls P03 and K01 5 turn the analog switches on or off so that the sound signals pass through the appropriate filters P03 1 K015 NORMAL H L SOLO 1 SOLO 2 CHORD 1 L H I On NORMAL mode all Envelope Pitch m...

Page 10: ...hm resistors the sampling signal is biased on 2 5V When the sampling sound level exceeds 0 3 t5V as shown Fig 5 the CPU starts to transmit the sampling sound data to the RAMs during the following time...

Page 11: ...ration memory play and sampling data area The chip select condition and memory assignments are as shown below Chip I 1 A15 1 CE 1 OE 1 Memory Assignment RAM 1 1 1 1 H 1 1 1 LSB L 22 528 bit MSB L 1 u...

Page 12: ...ansistors T4 and T8 turn on so that voltages VH VLl VL2 and VE are provided to the circuits When the keyboard is not operated for seven minutes the APO signal becomes L level Transistors T4 T8 turn of...

Page 13: ...D Figure 8 Voltage VA Point Preset Signal Point Figure 9 At power ON the waveform of point 2 provides a pulse by the differential circuit of resistor R and capacitor C The pulse initializes the intern...

Page 14: ...Pulse Signal 0 1V div 0 1 mS Jiv Reset Signal 0 2V div 2mS div Pitch Signal tor Piute 50mV div 0 5mS div Envelope Signal for Flute 2mV div 0 5mS div Percussion Signal SOmV div 5mS div Rhythm Rock Tem...

Page 15: ...Refresh Signal 0 2V d v lO iS dlv 0CE Signal 0 2V div 10 S div Tone Sampling Key G3 Key Common Signal KOO 0 2V div 0 5mS div Key Input Signal KI8 0 2V div 0 5mS div...

Page 16: ...O Faulty parts Transistors T18 T23 TIO or Analog Switch IC2 Melody or Obbligato tone does not sound on SOLO 1 or SOLO 2 mode Check the analog signal at collector of transistor T13 or T17 and at emitte...

Page 17: ...PCB Top id Bottom V w...

Page 18: ......

Page 19: ...110 CC 104MDCZ 0002 9177 C24 Ceramic 56pF 50V 5 CC 560JJBC 2819 0344 C26 1 Ceramic ISOpF 60V 5 CC151JJBC 2819 0654 C26 Ceramic lOOpF 50V 5 CC 101JJBC 2818 3054 C27 Semiconductive O lpF 16V 10 CC 104M...

Page 20: ...0110 C60 Semiconductive 0 022pF 25V 10 CC 223KFBZ 0002 8894 C61 Electrolytic lOO F 6 3V 20 CC 107M60A 2604 9374 062 Ceramic lOOOpF 50V 10 CC 102KJBC 2818 0110 063 064 Semiconductive 0 047 iF 16V 10 CC...

Page 21: ...Carbon film 3 ohm 1 5W R27 Carbon film 6 8kohm 1 SW R28 Carbon film ISkohm 1 SW R29 Carbon film 560kohm 1 SW R30 R31 Carbon film 22kohm 1 5W R32 Carbon film lOOkohm 1 5W R33 1 Carbon film Ikohm 1 SW R...

Page 22: ...7kohm 1 5W 16 N 0247EQC 0002 8726 R68 Carbon film 2 2kohm 1 5W 15 N 0216600 1 0002 8727 R69 i 1 Carbon film 3 3kohm 1 5W 15 N 0230600 1 0002 8946 R70 Carbon film 330ohm 1 5W 16 1 N 0410EQC 1 0002 9104...

Page 23: ...1 5W 5 1 N 0132EQC 0002 6723 R114 Carbon film 330kohm 1 5W 15 0002 9005 R115 Carbon film lOkohm 1 6W 15 N 0281EQC 0002 8729 R116 Carbon film 120kohm 1 6W l5 N 0375EOC 0002 8953 R117 Carbon film 1 ISk...

Page 24: ...5E FET T11 T23 2SC1740SQ NPN T24 T25 2SC1740LNSR NPN Trimmer Capaci r VC1 150pF 50V VCT84K Radio Shack Part Number Manufacturer s Part Number 2SC 2060 2SC 1740SQ 2SA 934R I 2SC 174DSO 2SK 105E 2SC 174...

Page 25: ...Contact Battery M42382 1 6 0932 6912 2630 18 Sponge for Keyboard M49 18 1 6910 3840 19 Speaker 4ohm 6AS 6P109H SP 5346 3631 0014 20 Wire for Speaker M42739 2 6907 4530 21 Wire for PCB ass y M3129 MA1...

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Page 29: ...Console PCB M3129 CN1M...

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