Some frequently serviced parts

The Roland JD-800 and JD-990 sometimes will need repair and new parts.
 
Most often keybed and painel parts need replacement. 

Here the service manual pages with part numbers and the how-to´s.
 

Front Panel Switches Parts list

 (Click to enlarge image)

Image by mike.partington


How to remove individual keys

 (Click to enlarge image)  

Image by sensitivedragon
 

 
How to install individual keys

(Click to enlarge image) 

Image by sensitivedragon


Parts list and diagram of individual keyboard keys  

(Click to enlarge image) 

Image by sensitivedragon


The complete manual, with all part numbers are here: Manuals: Owner and Service - JD800 and JD990

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How To Enter the JD-800 Internal Test Mode

Select Multi-Mode

Press and hold:

Cursor Left, Cursor Right and then Exit buttons.


When you enter Test mode, the right LCD show the current ROM version.


To choose the different tests press Exit and a Bank or Number Button.

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From MATRIXSYNTH: Roland JD-800 in Fancy Dress

Another beautifull modified JD like a SCI Prophet-VS.

I found this at MATRIXSYNTH: Roland JD-800 in Fancy Dress. That´s a nice blog to everyone who love synths or are ready fall in love.

This was done by Customsynth.co.uk, the same company who made the "Gandalf , The White".


Edited:  More from this nice machine!



The nice people from Customsynth have more pics at flickr too.

See this and the Yellow one! It's a Waldorf and Lamborghini style!

 Click the link to the Flick album with all pics:

Customsynth at Flickr


Thanks for the great work! 

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Roland JD-800 and JD-990 Factory Reset

The factory reset function will clean all your editings and restore original internal memory.

Use with caution. If you do this by mistake, there´s no way to undo this action.

JD-800: 

• Press data transfer.
• Page up to select factory preset.
• Press yes

JD-990: 

• Hold exit and press utility.
• Press F6.
• Press F5. 

 

A Roland JD-800 Synth Repair Video

This guy diagnosed and discussed these common issues: 

• Battery replacement 
• Dead keys 
• Clanking keys 
• Missing weights 
• Glue 
• Velocity stuck at max value 
• Bad buttons 
• Jumpy sliders 
• Part numbers included

Remember: If you try it is at your own risk.


Video at Youtube by Moretacos1

Keep Your JD-800 Clean

Just be careful with the Roland JD-800, clean it very often. 

Dust in the sliders, button and circuits can provoke a typical JD-800 berzerk (auto-programming...). 

This effect is like a ghost acting in the synth. If you don´t use to change program while playing, turn off the banks edit mode. (just press bank A-b-C-D to light off and then save the patch.


You will also note, when some parameter is changed because dust, a "point" will light in the painel, like if you have done it.

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