Vintage Synth Repair

Patrick
The key contacts are a bit more involved to access and would require
removing the printed circuit b oard under the keys (or worst case scenario,
under the keys which would require removing all the keys, possibly with a
special Roland tool). At that point you carefully remove the rubber cup type
contact strips, wash them in some warm sudsy water, rinse and let dry. You
can carefully clean the contact pc strips with some denatured or isopropyl
alcohol. Do not use any excessive rubbing. Reinstall the contact strips,
being careful to seat them properly and do a check. If you do not feel
comfortable with this, contact Bill Greenhill in England for assistance.
Hope this helps.
Keith Niver
Certified MITA technician

-----Original Message-----
From: patricktrfc [mailto:PdaDoran@...] 
Sent: Saturday, December 13, 2003 5:56 PM
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] Roland EP20 Some keys not working - any advice
please????


Dear All , 

Hello :>)

Hope I have come to the right place, have spent hours looking at 
sites for Roland, with patches and very techical stuff on, but 
nothing abut physical repair of electric pianos.

I have recently bought a Roland EP20 on Ebay, having wantd to learn 
to play the piano for years and this was very cheap,a good make and 
retro, so a bit cool.Heavy too! Choice of about 2 sounds so no PC 
required for this one.

It was sold as having some keys not working, fair enough and about 10 
out of 49 don't, some being muted, some silent and some a sort of 
static noise.
The duff keys  don't seem to follow any pattern either, being 2 apart 
then 10 apart then together etc

I took the back off and to be honest, it was way more technical than 
I had imagined! As it was a 70's? instrument, I was expecting 49 
keys, 49 switches to clean. Please don't laugh at me too much....

If necessary, I will send it to a repair shop but am itching to start 
playing right now and "entertain" my kids over Christmas.

Are there any simple steps that I could try, such as cleaning 
solutions etc or ways of testing contacts. I have had a look at the 
innards and there are no broken wires or burnt out circuits. Too complicated
stuff is a no-no as I fear my sausage fingers would 
not be up to replacing diodes / transistors in a circuit board.

Any advice gratefully received

Patrick
Chester , England










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