[sdiy] Chasis Rust prevention/removal - plus other maitainance

[J.D. McEachin]

At 12:38 PM 6/5/2005 -0400, Josh Henne wrote:

>There's a bunch of things to look after on my jupiter 6
>
> After looking inside my Jupiter 6 to check if all the board connections were
>secure due to a Europa bootup code error 

Which boot code, and how often?


>I noticed tiny rust spots forming on
>the botton of the steel case underneath the voice boards. What would work good
>to deal with this? Externally the 6 is *mint* except one missing pot cover.

Remove the boards, use steel wool on the rust, blow that away w/ air, then paint it w/ Krylon spray primer or similar.  I've seen rust on the inside of a lot of JP6s.  I'm guessing that Roland didn't put a thick enough coat of primer on the metal.  Or maybe they were shipped over on a very slow boat.  Or both.  :)


>Also I'm thinking I should replace the power supply for both my Jupiter 4 and
>six. Just do a part for part replacement? 

Given that it's a 20 year old synth, replacing the big caps in the ps couldn't hurt.  I wouldn't go farther than that unless problems appear.


>Should I also replace certain capacitors on the voice boards? 

Not unless there are irregularities between the voices AFTER calibration.  Calibrate, and use your ears.

To reach calibration mode, hold the TAPE button to boot in Roland mode, then move the JIG switch on the CPU board AFTER it has booted.


>I was also thinking of socketing all the chips but that looks like too much hassle. 

Why would you want to decrease reliability and risk destroying chips?  It ain't broke, so don't try to "fix" it.


>Also there looks to be some sort of
>coating/pollution/grime/scaling on the voice boards that could be cleaned off.

There's probably something in the list archives on cleaning pc boards.  Just be careful of the trimpots - get anything in them and they're worthless.

And be sure to clean the boards BEFORE calibrating them.

JDM