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  VS-MIDI 

  

MIDI  Interface for Vermona Synthesizer   

Model 8-434  ver. 1.0 

 

 

 

Copyright © 2009 CHD Elektroservis 

All rights reserved. No part of this publication may be reproduced in any form without the written permission of CHD Elektroservis. 

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1. INTRODUCTION 

 

VS-MIDI is a MIDI retrofit for the Vermona Synthesizer. The device enables the instrument to 

be  controlled  via  MIDI  as  a  MIDI  expander.  VS-MIDI  controls  VCO,  VCF,  VCA  and  EG  of  the 
instrument. 

 
 
 
1.1. PARTS OF MIDI INTERFACE KIT 

 

The  supplied  MIDI  interface  kit  contains  all  necessary  parts,  materials,  and  detailed  installation 

instructions. 

 

Pic. 1-1 – Parts of interface kit 

 

The kit contents: 

 

1.  MIDI Interface board 

 

2.  Supply  bunched  cables  with 

connector and LED 

 

3.  Signal  bunched  cables  with 

connector 

 

4.  2x connector DIN-5 with cable 

(including screws etc.) 

 

5.  CD-ROM  with  the  user  and 

installation 

manuals 

and 

software 

 
 
 
 
 
 

1.2. GENERAL INFORMATION 

 

The installation of all interface components is easy. If you follow the instruction from this manual 

there  will  be  no  major  problems  during  the  installation  procedure.  All  original  features  of  Vermona 
Synthesizer instrument are kept. The instrument can be used the same way as before the retrofitting. 

 

The  following  tools  are  necessary  for  the  installation:  screwdriver,  Phillips  screwdriver,  driller, 

drills 3,2 a 16 mm, smaller rasp, soldering iron (a low heat iron and soldering paste). 

 
 

 

Attention !  Disconnect the Vermona instrument form the mains prior to the installation. 
Otherwise, there is a risk of the electric shock! 

 

The  producer  is  not  responsible  for  any  eventual  mechanical or electrical damage of 
the  Vermona  instrument  caused  by  the  infringement  of  the  described  installation 
procedure or by careless manipulation during the installation of the MIDI interface! 

 
 
 

Summary of Contents for VS-MIDI

Page 1: ...7 Model 8 434 ver 1 0 INSTALLATION MANUAL 2009 CHD Elektroservis ...

Page 2: ...tion 3 2 MIDI interface installation 4 2 1 Releasing of the instrument cover 4 2 2 MIDI connectors montage 5 2 3 Montage of supply bunched cables 7 2 4 LED indicator montage 8 2 5 Montage of signal bunched cables 9 2 6 Interface board placement 12 2 7 Assembling of interface 13 2 8 Finishing of installation 14 3 Changes and new functions 15 4 Limitations of instrument usage 15 5 DAC VCO calibratio...

Page 3: ...e including screws etc 5 CD ROM with the user and installation manuals and software 1 2 GENERAL INFORMATION The installation of all interface components is easy If you follow the instruction from this manual there will be no major problems during the installation procedure All original features of Vermona Synthesizer instrument are kept The instrument can be used the same way as before the retrofi...

Page 4: ...nstrument before pic 2 1 and after pic 2 2 the interface installation Pic 2 1 Original block schematics of the instrument GLIDE CV MEMORY GATE GEN VCO 1 VCO 2 VCF VCA LFO EG GENERAL TUNE MOD MOD ADSR LFO GATE ADSR ADSR OUT UTS Pic 2 2 Connection of interface to the instrument 2 1 RELEASING OF THE INSTRUMENT COVER a Unscrew the two screws from the front panel of the instrument pic 2 1 1 Do not lose...

Page 5: ...I IN and MIDI OUT connectors montage Couple of facilities is here If you do not want to mechanically damage panel of the instrument install only MIDI IN connector replace headphones socket obn rear panel with MIDI IN socket MIDI output stays unconnected in that case see pic 2 2 1 If you want to keep headphones connector operational and instrument s panel without additional holes MIDI cables can be...

Page 6: ...lly so as to not drill the parts and components inside the instrument pic 2 2 4 Pic 2 2 3 Pic 2 2 4 160 22 5 32 30 c Clean the edge of the holes with small rasp Also clean the holes from the inside after the turning over the front cover d Clean all metal sawdust and raspings from the inside of the instruments they can cause short circuits or serious electrical damage if left in the instrument Plea...

Page 7: ...ple see pic 2 2 2 2 3 MONTAGE OF SUPPLY BUNCHED CABLES Supply bunched cables is equipped with flat five pin connector Four wires of bunched cables Nr 2 to 5 must be connected to instrument s power supply board as displayed on pic 2 3 1 Used solder lugs on power supply board shows pic 2 3 2 Pic 2 3 1 Connection of supply cable bundle and LED X2 12V 12V 20V GND red LED green LED 20V GND POWER SUPPLY...

Page 8: ... 3 2 d Solder the red cable Nr 4 to supply voltage 12V solder lug 4 12V pic 2 3 2 e Solder the blue cable Nr 5 to supply voltage 12V solder lug 5 12V pic 2 3 2 2 4 LED INDICATOR MONTAGE Original LED which indicates power on status of the instrument has to be replaced with two color LED This LED is fixed to cable Nr 1 of supply bunched cables Procedure is as follows a Unsolder leads of original LED...

Page 9: ...new LED Isolate the connection with the insulation tube and heat it until it shrinks tightly to the cable and LED s lead pic 2 4 8 The tube can be heated with a hot flue pistol for example Pic 2 4 7 Pic 2 4 8 2 5 MONTAGE OF SIGNAL BUNCHED CABLES Signal bunched cables is equipped with flat seven pin connector Wires of bunched cables must be connected to instrument s VCO VCF VCA a EG boards as displ...

Page 10: ... this publication may be reproduced in any form without the written permission of CHD Elektroservis 10 Pic 2 5 1 Connection of signal bunched cables X1 1 2 3 4 5 6 7 UTS EG VCO VCF VCA EG BOARDS VCF VCA Gate red yellow green blue GND black white CV red Pic 2 5 2 Placement of signal bunched cables Pic 2 5 3 Solder lugs on VCO board ...

Page 11: ...perational amp IS1 on VCO board pad 1 CV c Solder shielded cable Nr 3 white the other wire of shielded twin lead to UTS signal on VCO board solder lug 3 UTS d Solder the black cable Nr 2 ground shielding to ground potential on VCO board solder lug 2 GND e Solder the red cable Nr 7 to signal GATE on VCO board solder lug 7 Gate Pic 2 5 4 Solder lugs on EG board f Unsolder two blue cables from solder...

Page 12: ... cable Nr 6 VCA of signal bunched cables to this lug h Original blue cables which related EG VCF VCA boards can be fully removed or it can be retained in the instrument but it is necessary to insulate them in this case so that no short occurs in the instrument 2 6 INTERFACE BOARD PLACEMENT a Board of the interface will be placed left on rear panel inside the instrument pic 2 6 1 Cleanse and degrea...

Page 13: ... is unambiguously given by the connector lock pic 2 7 1 b Put the five pin connector of supply bunched cables to plug right on the interface s board Orientation of the connector is unambiguously given by the connector lock pic 2 7 1 c Put two two pin connectors of MIDI cables to plugs right on the interface s board Orientation of the connectors is unambiguously given by the connectors locks Be sur...

Page 14: ... Detection of VCO board version Older version of VCO board 1 has operational amp B081 it has 8 leads on position IS1 and values of R24 and R25 resistors are 220kΩ Newer version of VCO board 2 has operational amp A109 it has 14 leads on position IS1 and values of R24 and R25 resistors are 22kΩ Type of operational amp is printed directly on its cover and values of the resistors can be measured with ...

Page 15: ...es simultaneously If there are any MIDI commands Note On Off received the interface take over the control of the VCO VCF and VCA circuits of the instrument and the instrument s own keyboard can not be used yet Instrument s VCO is fully detuned in that case If there is a request to use own instrument s keyboard again reset the interface e g switch the instrument off wait for a while and then switch...

Page 16: ...7 ...

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