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Repair a leaky output or battery of a Roland JP-8000 Synthesizer – Tutorial – Reparatur

Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat

Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparatur

Another Roland JP-8000 Synthesizer on my bench today that has a weak output. If you want me to fix this for you, but you don't want to send in your whole synthesizer, I created this tutorial for you. It's maybe also useful for other techs who wants to repair it themselves.
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
1. Unplug your synthesizer from mains !!! Remove all other cables like audio and/or MIDI.
2. Flip over the JP-8000, so you have access to the black buttom panel. Be careful to lay something under the bender to support it and not to damage or break it.
3. The loosen all the black screws. I recommend an electric screwdriver here ;)
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
Once you lift up the black panel you can spot the mother board under the metal shielding. It looks like this:
Repair-Roland-JP-8000-Synthesizer-Tutorial-A2019111701-Reparatur-4b
4. Next I suggest you loosen all cables. Starting from left to right with the big black on on the left. STOP! You cannot just "pull it out". First you have to unlatch the cable from the plug. Grab it with your fingernails left and right or use a screwdriver and carefully lift the white frame up like so...
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
Now the cable is loose and you can carefully pull it out.
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
5. Now pull the two ribbon cables. Gently pull them...
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
and put them out of the way like so.
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
6. Next one. FIRST lift up the white connector frame...
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
THEN pull the cable
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
If you have trouble lifting the frame, then you start can unscrew the shielding like so...
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
 
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
7. When all cables are loose start to unscrew the shielding.
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
 
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
8. Once you have unscrewed the shielding you can remove it. You now should see the "motherboard".

STOP! Don´t touch it.

You might be charged with a static voltage that can damage the components. If you just want to change the battery, you can do that now. Don´t forget to back up your memory first :-)
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
9. Now you can start to unscrew the "motherboard".
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
 
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
10. If you have a Anti-Static Wrist Strap Grounding, you can remove the board now. If you don´t have such, try to ground yourself first. You can store the board into an anti static bag which I can send you, if you want me to repair your board.
Repair Roland JP-8000 Synthesizer Tutorial (A2019111701) Reparat
 

Caution


There are lethal voltage exposed in electronic devices. Unless you know what you are doing, don’t try this. If you following along, you doing so at your own risk.
I’m documenting repairs for my reference and yours. I do synth restorations and repair with a specialty in vintage synthesizers, drum computer and other vintage gear, based in Düsseldorf, GER. Get in touch about your synth situation!