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AM 334-01-502

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assembly manual

Technical Data

DX 400/500

AM 334 1st Edition

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Summary of Contents for DX 400

Page 1: ...AM 334 01 502 1 assembly manual Technical Data DX 400 500 AM 334 1st Edition ...

Page 2: ...AM 334 01 502 2 ...

Page 3: ...9 Plug in Board MST 3 Master Processor 42 II Control Panels 44 1 CB Boards 44 2 Key Contact Boards 44 CB 20 27 28 Slide Controls Drawbars 45 CB 21 Switches Display 46 CB22 Switches 48 CB 23 Rhythm 50 CB 25 VCF Glide Touch Vibrato 51 KD I Key Contact Board 52 KD 2 Key Contact Board DX 500 only 55 KD 4 Key Contact Board DX 400 only 56 Ill Peripheral PC Boards 57 1 PCBoardsCB24andSTl5 57 2 PCBoardsMP...

Page 4: ...tones are still developed and processed mainly by analog means 3 Digital Systems Using Original Sounds in Memory Committing original musical sounds to a digital memory is a widely know technique used in digital synthesizers and rhythm units In moderately priced instruments reflecting moderate technical sophistication the sounds of instruments such as trumpets violins and pianos are stored exactly ...

Page 5: ...ammable complex voices each with two simultaneous sound com ponents The coordination of these via the master processor can arbitrarily stem from the upper manual lower manual auto accompaniment or pedals Since every voice consists of two envelope shaped tone components each eight audio channels are required to produce four voices By this means all voices can be constructed from two components for ...

Page 6: ...s the analog audio signals to the desired audio bus channels 3 Audio Block Diagram The audio signals from the slaves are routed to five audio channels Fig 3 where they undergo various types of processing a Superdeemphasis superlowpass For bass voices b Deemphasis lowpass channel For round tone voices such as drawbars c Direct bright channel Slave audio passes unchanged to the amplifiers d VCF chan...

Page 7: ...oes through a lowpass bandpass filter and on to an instantaneous volume control circuit 5 Digital Reverb Unit The master CPU controls the reverb modes short long fast echo slow echo The digital reverb functions as a processor supported real time system whose CPU controls the analog to digital ADC conversion the digital display and the digital to analog DAC conversion 6 Interface The interface enab...

Page 8: ...AM 334 01 502 8 Fig 3 Block diagram of the audio section ...

Page 9: ... is a mechanical support for all the plugin boards It connects the boards together electrically It carries all the connectors for wiring the peripheral boards via ribbon cables The accompanying table shows the pin layout of the edge connectors on the MB 30 these are the access points to the plug in boards The diagram shows the layout of the ribbon cable edge connectors on MB 30 these are the acces...

Page 10: ...AM 334 01 502 10 BACKPLANE BOARD MB 30 EDGE CONNECTOR PIN LAYOUT VIEWED FROM SIDE A ...

Page 11: ...AM 334 01 502 11 Backplahe board MB 30 plug layout ...

Page 12: ...ransistor It is driven by 02 and Q3 which are in turn driven by ICi When 04 is switched through memory choke Li builds up a field and electrolytic capacitor C16 charges up until the output voltage pins 25 26 reaches 5 V DC The red LED indicates this During Q4 s shutdown period the charge on C16 maintains the supply current while diode D4 serves to maintain the current flow resulting from the colla...

Page 13: ...AM 334 01 502 13 Fig 4 Plug in board PS 12 component layout and functions ...

Page 14: ...AM 334 01 502 14 Fig 5 Plug in board PS 12 schematic diagram ...

Page 15: ...om 1C2 pins 8 channel A and 9 channel B go via summing buses A and B to summing amplifiers lC4c and d Microphone audio is applied to the summing buses via R1Ol and R103 rhythm via R98 and R105 and reverb via R99 and R104 The summing amplifiers are quieted when field effect transistors FETs Qi and Q2 are conducting This occurs when for example the organ is turned on and as explained in PS 12 a rese...

Page 16: ...AM 334 01 502 16 Fig 6 Plug in board AF 12 component layout and functions ...

Page 17: ...AM 334 01 502 17 This Page is Intentionally Blank ...

Page 18: ...AM 334 01 502 18 Fig 7 Plug in board AF 12 schematic diagram ...

Page 19: ...AM 334 01 502 19 ...

Page 20: ...hip The digital information data from the CPU feeds via a 16 bit bus into 1C7 a 2K x 8 random access memory RAM from which it is periodically read out the RAM then receives additional data from the CPU reads it out when required and so on This continuous feed and readout cycle achieves a delayed feedback of the digital signal i e the delayed signal is added to the 12 bit output of the analog to di...

Page 21: ...AM 334 01 502 21 Fig 8 Plug in board DH 10 component layout and functions ...

Page 22: ...AM 334 01 502 22 Fig 9 Plug in board DH10 schematic diagram ...

Page 23: ...AM 334 01 502 23 ...

Page 24: ... The output signal from the bucket brigades is filtered anew by IC11 and fed to analog switch 1C14 which handles the deep and flat functions of the Wersivoice The processed signal appears at pin 14 of 1C14 The signal is switched to either pins 3 or pins 4 edge con nector by 1C15 From there it goes to amplifier AF 12 b VCF The voltage controlled filter VCF receives its input from pin 6a of the edge...

Page 25: ...AM 334 01 502 25 Fig 10 Plug in board EF 20 component layout and functions ...

Page 26: ...AM 334 01 502 26 Fig 11 Plug in board EF 20 schematic diagram ...

Page 27: ...AM 334 01 502 27 ...

Page 28: ...ly at output pins 15 and 17 of 1C13 The 6ut put from pin 14 of 1C13 is used to quiet squelch the amplifier on board AF 12 b R5232 Interface 1C9 a special RS232 interface IC converts 8 bit parallel data words into serial data and vice versa depending upon the mode of operation This serial signal TXD is switchable in multiplexer 1C8 to cassette or to RS232 operation When RS232 is selected the signal...

Page 29: ...AM 334 01 502 29 Fig 12 Plug in board EF 19 component layout and functions ...

Page 30: ...AM 334 01 502 30 Fig 13 Plug in board EF19 schematic diagram ...

Page 31: ...AM 334 01 502 31 ...

Page 32: ...in digital sound modules IC23 thru lC26 These sounds appear at output pins 12 thru 19 of 1C9 as momentary digital data in multiplexed form The data is converted into an analog signal in DAC IC1 The signal then goes to IC4 where its volume can be controlled The percussion sounds appear at the output of 1C2 in the form of a multiplexed analog signal Demultiplexer IC5 routes each sounding instrument ...

Page 33: ...AM 334 01 502 33 Fig 14 Plug in board DDS 3 component layout and functions ...

Page 34: ...AM 334 01 502 34 Fig 15 Plug in board DDS3 schematic diagram ...

Page 35: ...AM 334 01 502 35 ...

Page 36: ...or Slave 3 S for Slave 4 I for Slave 5 If for example you wish to test Slave 3 press R e Select the voice Again press one of the five switches W for 1st voice E for 2nd voice R for 3rd voice S for 4th voice I for 5th voice Again by way of example if you have selected Slave 3 and wish to test the 1st voice press W f Select any DMS instrument the Horn for example and play on the selected manual The ...

Page 37: ...AM 334 01 502 37 Fig 16 Plug in board SL 3 component layout and functions ...

Page 38: ...AM 334 01 502 38 Fig 17 Plug in board SL3 schematic diagram ...

Page 39: ...AM 334 01 502 39 ...

Page 40: ...AM 334 01 502 40 Fig 18 Plug in board MST 3 component layout and functions ...

Page 41: ...AM 334 01 502 41 This Page is Intentionally Blank ...

Page 42: ...AM 334 01 502 42 Fig 19 Plug in board MST 3 schematic diagram ...

Page 43: ...AM 334 01 502 43 ...

Page 44: ...ormally open working state is measured electronically Every eight contacts are assigned to a matrix address For five octaves 61 keys eight matrix addresses are necessary These matrix addresses are sequentially switched to ground so that the statuses of the 61 contacts can be polled The speed at which the polling takes place is determined by the setting of the code switch S1 Note Reset must be pres...

Page 45: ...AM 334 01 502 45 Fig 20 Control boards CB 20 27 28 slide controls drawbars schematic diagram ...

Page 46: ...AM 334 01 502 46 Fig 21 Control board CB21 switches display schematic diagram ...

Page 47: ...AM 334 01 502 47 ...

Page 48: ...AM 334 01 502 48 Fig 22 Control board CB22 switches schematic diagram ...

Page 49: ...AM 334 01 502 49 ...

Page 50: ...AM 334 01 502 50 Fig 23 Control board CB 23 rhythm CX 4 schematic diagram ...

Page 51: ...AM 334 01 502 51 Fig 24 Control board CB 25 VCF Glide ...

Page 52: ...AM 334 01 502 52 Fig 25a Key contact board KD1 schematic diagram ...

Page 53: ...AM 334 01 502 53 ...

Page 54: ...AM 334 01 502 54 Fig 25b Key contact board KD1 schematic diagram b ...

Page 55: ...AM 334 01 502 55 Fig 26 Key contact board KD 2 schematic diagram DX 500 only ...

Page 56: ...AM 334 01 502 56 Fig 27 Key contact board KD4 schematic diagram DX400 only ...

Page 57: ...d OS 1 is plugged in the LED current of the optocoupler on O51 flows through P1 R3 pin 4 of the jack and R24 on ST 15 causing a voltage drop across R24 sufficient to turn on as This biases D4 off stopping the auxiliary current The swell pedal now has sole control over the volume 2 PC Boards MP 2 thru MP 6 These boards Fig s 30 thru 34 contain the interfaces for microphone headphones and tape recor...

Page 58: ... cables Fig 36 shows the circuit for only one hybrid amplifier since the two circuits are identical The corn ponent designations of each circuit s discrete components are shown together ex R7 14 When the LE 30 is first turned on capacitor C4 charges slowly through R1 until the collector voltage of Q1 becomes high enough to turn on Q1 This energizes the relay the relay s contacts close completing t...

Page 59: ...AM 334 01 502 59 Fig 28 Interface panel CB 24 MIDI circuits ...

Page 60: ...AM 334 01 502 60 Fig 29 Interface panel ST 15 schematic diagram BETA CP only ...

Page 61: ...AM 334 01 502 61 Fig 30 Microphone preamp MP 2 MP 3 BETA S and T only ...

Page 62: ...AM 334 01 502 62 Fig 31 Microphone preamp MP 2 BETA S and T only ...

Page 63: ...AM 334 01 502 63 Fig 32 Microphone preamp MP 4 DX 500 only ...

Page 64: ...AM 334 01 502 64 Fig 33 Microphone preamp MP 5 BETA CP only ...

Page 65: ...AM 334 01 502 65 Fig 34 Headphone amplifier NIP 6 BETA CP only ...

Page 66: ...AM 334 01 502 66 Fig 35 Triac switch TS 5 schematic diagram not in BETA CP ...

Page 67: ...AM 334 01 502 67 Fig 36 Power amplifier PA 10 schematic diagram not in BETA CP ...

Page 68: ...s or audio Display A visual indicator used as a means to read out digital data EPROM Erasable programmable read only memory see ROM a ROM capable of storing new data existing data can be erased and new data can be read into the ROM Hardware The components which make up the computer proper the electronics control devices readouts etc The hardware carries out the computer functions in accordance wit...

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