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Since the beginning this site tryes to be a compilation center of the best sources for the JD800. Not a copy.
So please, visit the sites at the Links section for lots of much more very good information.
Something that is frequently requested are alternatives to replace the JD-800 keybed with another that is similar as it is practically impossible to obtain a replacement.
We asked our friend Paulo Audiocare (Brazil) who is a technician with long experience in maintaining synths and the suggestion was as follows:
"The best keybed to adapt to the jd800 or U-20 is the Roland W30 (or D50, which is the same).
Just make the adjustments to the matrix.
The mechanical part is very close and the drillings are almost exact."
This was posted by Alex Ball at Youtube in a recent work posted September, 13, 2023.
Thank you!
This JD-800 now is with Andrew Ward who gently allowed this video.
Sorry, no Sysex is available nor is there a possibility of getting it. This is explained in the video.
Citing Akex's words:
"Here's a look at Tony Banks' Roland JD-800 that he used live throughout the 1990s.
In this video, we have a listen to the tour patches stored on the instrument and get a little glimpse into how Genesis did things in front of stadiums full of adoring fans.
Huge thank you to Andrew Ward for the loan of this historic instrument.
Gaining access to the internal parts of the JD-800 is a simple process but requires a little care.
Removing all screws may do your internal components fall.
You must remove only the screws AROUND the bottom and two screws in the center line, they are at 1/4 from side, and may be you can see a few bigger hole where thy fit to.
Sometimes the bottom have some "dust" acting like glue to.
Photo: Gwydion Elderwyn
How to remove the panel. JD-800 Manual. (click to enlarge) Source: Roland Co.
As a JD-800 lover, maybe you perceive I really love this synth, I was after this for a long, long, long time. To be clear, since 2002 when I got the JD-800 and created this site.
In a short, the JD-800 SE is a version with the Strings Card plus exclusive patches but the same original factory presets.
In practice, the JD-800 SE included all 5 cards.
In the early 91-92, people from Roland's Brazil asked for a group of very experimented Brazilian musicians to help create new patches for the JD-800.
This version received an entirely new set of patches not included in the factory presets.
But this was a problem too because almost all users forgot to save the internal memory into a memory card (not included), so those patches become lost for a long time.
So, if you have a JD-800 SE and restore factory presents, you will lose the SE version patches! This happened to most of them sadly.
After nearly two decades, I found someone who still has the patches saved plus the original prints included with that special model.
And yes, I have the JD-800 SE, but I was after such patches for a long time, and still, sadly I do have not the String Card (a really fantastic one).
The new patches were created due to the great work of:
Eric Persing
Adrian Scott
Paulot Roberto T. A. de Oliveira
Lucas K. Shirahata
Carlos Alberto F. Merussi (Pardal)
The patches:
After finding this, I commented in local groups and then another colleague made a simple video about it, and for sure the JD-800 SE deserves a better one, but he has not the String Cards and his machine sadly is in bad shape, using another keyboard as a controller.
The original credits to these great guys:
On this page below you can download this rare set of patches. Copyright @Roland Co.
Also see, this video to have a very simple idea, made by Tiago Mallen who is using a controller and without the String card.
Anyways, no matter who made what, I give thanks to this beloved great friend who gifted me with the original material after decades so we solved the mystery of the JD-800 SE!
Mr Katsunori is a well know musician and his reviews are always great!
In his words:
"The Roland JD-800 was an epoch-making synth that combined the operability of a digital sound source and an analog feel. The character that is clear and has a strong presence is wonderful even if you listen to it now! .. The famous no.53 piano is still very nice! Katsunori UJIIE"
Thanks to all lovers of the JD-800, here's a very complete work about the new PCB that has been designed by Guy Wilkinson with the help and manufacture of PCBWay.
We cited them in a recent topic too. Thanks, guys!
Please follow the link bellow for the very complete material I'm sure all you will love it!
Our colleague Igor Kopman posted about the problem, and here what appears to be the main trouble, so he posted this first solution:
"Hi guys. Many people have Trailing distortion after every effects based patch on JD800. This is the DAC problem. Very easy to fix. Just replace the R100 resistor to another with a lower resistance on output board, and the problem will gone."
Igor Kopman the original resistor has to be measured out of circuit. Do you still have your original and what does it measure? The schematic and colour code says it should be 470k
So after more replies from many colleagues in the group and thanks to Igor Kopman for presenting this need, Julian Campposted what appears to be a more simple solution:
Replace VR1 with a high quality multi turn pot and it will fix the issue. The original VR when turned all the way counterclockwise or clockwise reads around 440ohm. The VR wasn't going low enough in resistance. Resistors R100, R101 and R102 tested within spec.
Thanks to everyone for supporting this great music machine! I love this synth and all you!
Manuals available:
If you need the JDs Service Manuals plus all the others JD' manuals just enter at this page:
The original topic text messages for credits, many people helped for sure!
** Igor Kopman
Hi guys. Many people have Trailing distortion after every effects based patch on JD800. This is the DAC problem. Very easy to fix. Just replace the R100 resistor to another with a lower resistance on output board, and the problem will gone.
** Radek Tymecki
You think that changing the resistor is the key? Caps are ok?
** Jym Mccullough
Can you be more specific on "lower resistance?" How about an exact value that works?
** Kevin Nolan
Jym Mccullough It looks like a 46 Ohm Resistor - hard to tell but I think I'm seeing Yellow-Blue
** Igor Kopman
Jym Mccullough I will open my JD800 and check it.
** Igor Kopman
Jym Mccullough Ok the resistor is 137k
** Kevin Nolan
Igor Kopman Yup - 46 Omhs - 137k - I was almost right 🥴 (ye know - on the cosmic scale of things...)
** Julian Camp
Igor Kopman the original resistor has to be measured out of circuit. Do you still have your original and what does it measure? The schematic and colour code says it should be 470k
** Igor Kopman
Julian Camp I think it was 240k or 270k
** Julian Camp
Igor Kopman that's what it would measure in circuit. Did you measure it out of circuit?
** Julian Camp
You have to take the resistor out of circuit to measure it. Mine reads 480k. The schematic and colour code shows it should be 470k. So this resistor shouldn't be the issue unless my cheap meter is correct and it is 10k out of spec. Will replace with a … Ver mais
** Julian Camp
470k. Color code Yellow Violet Yellow Gold
** Gilberto Strapazon
Thanks Igor Kopman!
Please, you or someone else with the same trouble may check about the measure out of the circuit of the probably damaged part?
This topic will be replicated at the JD800center if we have more info.
Appears the kind of problem with a easy solution and this means Gold!
I'm saving all the topic (with all replies for credits) for a post at my site.
I'm sure many people will be after this information too.
Thanks for more replies so I will soon post at the JD800Center too.
** Jym Mccullough
Gilberto Strapazon Thanks for maintaining your website. I've looked there many times for info and tell others as well.
** Julian Camp
I will replace the three resistors going to the trimmer pot and report back. Will be replacing with original values. R100 - 470k, R101-1M, R102-200k.
** Eric Vaubel
My JD-800 and my PCM-80 both do this. Will investigate!
** Julian Camp
UPDATE!
Replace VR1 with a high quality multi turn pot and it will fix the issue. The original VR when turned all the way counterclockwise or clockwise reads around 440ohm. The VR wasn't going low enough in resistance. Resistors R100, R101 and R102 tes… Ver mais
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