Hi Scott, thanks a lot for your answer. The polarity of
the external power supply can be swaped changing the position of the tip.
Sometimes I have plugged it in the wrong way and the result is that the unit
doesn't work. Anyway, I'll check that.
Thanks!
Kind regards.
Miguel.
From: Scott S.
Sent: Thursday, March 11, 2010 4:13 PM
Subject: Re: [vintagesynthrepair] Roland SH 101 power adaptor
problem
Miguel, what type of power supplies are you using? I think the SH-101 is
positive ground, unlike most other external power supplies. That probably is not
your problem, but thought I would mention it here for reference. Roland could
have put in diodes to protect it, or possibly a zener to correct the
polarity?
Out of tune could just mean that it needs
calibrating.
thx-shs
On Wed, Mar 3, 2010 at 2:17 PM, Miguel Mendoza <miguel@filminteractive.es>
wrote:
Hello group, I'm having a problem with my Roland SH 101:When I turn it on, it takes some time to start working. After this, the synth is completly out of tune.After some time, the external power supply is getting very hot and I turn it off.I tried with several external power adaptors with the same result.I think that it could be a problem with the internal voltage regulator or a conderser but I would like to know if any of you know anything about this problem or have any idea of what it could be.Thanks a lot in advance.Regards.Miguel.