Christian Treldal wrote:
Den Thu, 25 Jan 2007 09:54:35 +0000 skrev Mungo \"Two Sheds\"
Toadfoot:


One other possible symptom is that the main transformer on the power
board hisses. The sound changes if I push on the transformer itself,
or on the board. There are two large capacitors near the
transformer, one of which has a small bulge on the top, which can be
pushed back down easily, but shows no sign of leaking, nor do any of
the other caps.

Any thoughts?

New capacitors. The bulge is a sign. If you mesure them with aa ESR
meter you will find a high esr. It cauces all kinds of strange faults
in the PSU.

Much appreciated, thank you... and to Mr Plow

I've put some pictures here if you wouldn't mind having a look:
http://www.arcl40.dsl.pipex.com/roland/roland.html

The 1st, 3rd and 4th pictures show the small bulge in the top, and the 5th
and 6th pictures show their position on the board, next to the transformer.

I'll get searching for new ones.

Would it be an idea just to replace all the caps on the board or is that
overkill?

Si