Archive of the former Yahoo!Groups mailing list: All about the Roland Jupiter-series

previous by date index next by date
previous in topic topic list next in topic

Subject: Re: Any advice on fixing a trashed Jupiter 4 ?

From: "Verschut, Ricardo" <ricardo.verschut@...>
Date: 2000-02-28

-----Original Message-----
From: Rick Harris [mailto:rick.h@...]
Subject: Re: [AH] Any advice on fixing a trashed Jupiter 4 ?

At 12:19 26/02/00 -0000, you wrote:
>>Any ideas on where to start looking for the problem ? There's no obvious
>>damage, but I'm guessing another IC somewhere has been barbecued. I'm
>>working on getting the service manual.
>It sounds like there's still some dirt or dirty connections to deal with,
>as well as some bad caps(?).

Now that you mention it, a couple of the ceramics on the motherboard are a
little bent over with some damage around the tops of the legs, but it looks

The 4 is a pretty good synth, with nice,
>snappy envelopes, a great filter, etc. Note that if you can't get it to
>the filter uses rare 'Roland' transistors and there are four fairchild
>uA726 chips on the oscillator board, which go for about $45.00 each.
>If there are any damaged keys, I believe that Kurt's Amps in the USA
>has spares for sale:

Thanks for your advice. The keyboard looks nice and seems mechanically in
good shape, so maybe there's something screwy in the keyboard controller
board. I'll check out the keyboard wiring with a multimeter but it looks


[This message contained attachments]