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Roland JX-8P Vecoven PWM Installation Manual
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Roland JX-8P Vecoven PWM Installation Manual

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VECOVEN PWM
JX-8P
INSTALLATION

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Summary of Contents for Roland JX-8P Vecoven PWM

  • Page 1 VECOVEN PWM JX-8P INSTALLATION...

  • Page 2: Table Of Contents

    CONTENTS 1. Introduction ………………………………………………………………………………………………… 2. Accessing the Main Board ………………………………………………………………………. 4 - 5 3. Removing the Main Board ………………………………………………………………………. 6 - 7 4. Replace the Synth ROM …………………………………………………………………………………… 5. Replace the Synth CPU …………………………………………………………………………………… 6. Install the Counter Board ………………………………………………………………………. 10 - 12 7.

  • Page 3: Introduction

    1. Introduction The Vecoven PWM kit provides the Roland JX-8P with a Pulse Width Modulation feature for its oscillators. Whilst requiring surgery to the main board, the installation is significantly easier than that for the JX-10 (a new PWM kit for the JX-10 will soon be available).

  • Page 4: Accessing The Main Board

    2. Accessing the Main Board Remove the two screws indicated from the left hand underside of the case. Remove the three screws indicated from both the left and right hand side end cheeks. Remove the two screws indicated on the rear panel, next to the Midi jacks.
  • Page 5 Carefully lift the front panel.

  • Page 6: Removing The Main Board

    3. Removing the Main Board Carefully unplug all cables from the main board. It is highly recommended that they be labelled at this stage. Note the orientation of CN2 in particular as there are unused pins in the socket on the board.
  • Page 7 Remove the nine screws indicated and carefully lift the main board out and place on an appropriate, electrostatically protected work surface. NOTE: Task Order There is no set order to the following tasks. The order set out in this guide is merely how this particular installation was completed.

  • Page 8: Replace The Synth Rom

    4. Replace the Synth ROM Remove the existing Synth ROM, IC22. On v2 main boards it is likely to be socketed however on v3 main boards it is likely to be soldered directly to the board. If this is the case, carefully de-solder the 28 pins and remove the IC. For those boards without one, it is recommended that a high quality socket is soldered in place.

  • Page 9: Replace The Synth Cpu

    5. Replace the Synth CPU Carefully de-solder the 40 pins of the existing Synth CPU, IC30. It is recommended that a high quality socket is soldered in place. Such a socket may have been included in the PWM kit if requested. Carefully insert the new 80C320 Synth CPU into the socket ensuring correct orientation.

  • Page 10: Install The Counter Board

    6. Install the Counter Board Carefully de-solder the four D8253C counter chips, IC39, IC40, IC41 and IC42. PWM Kit Configuration / Counter Board Install Method Due to installer preferences and the options available when purchasing the PWM kit, there is no definitive method for the installation of the Counter board.
  • Page 11 Turned pin SIL headers were soldered to the remaining pins on the Counter board. Note that the six pins of J1 are not connected and do not require header pins. High quality, turned pin socket and SIL header sockets were installed on the main board. The Counter board was then seated into the sockets very carefully using appropriate pressure applied evenly over the board taking the utmost care not to crack the PCB.
  • Page 12 Note from the author: Ensuring all headers and sockets were straight on both main board and Counter board was quite challenging and in my opinion, soldering direct to the main board would be preferable. Again, installation method depends on purchase options chosen and the installer’s own preferences. It is highly recommended to check for continuity between all pins on the Counter board and main board particularly when sockets/headers have been used.

  • Page 13: Install / Update The Flash Rom

    7. Install / update the Flash ROM If a Vecoven v5 Flash ROM has not already been installed, remove the existing ROM IC6 and replace with the new v6 Flash ROM ensuring correct orientation. Refit the main board and reconnect all cables. Ensure CN2 is correct! Close the lid and power up the JX-8P to check correct operation.