ACCU TUNER

[Frank Cahill]

These devices are very sensitive to static discharges.  I own two of them and
both do it.  Are you using a switch on the tuning hamer?  One of my tuners
tends to destroy the op amp inside that amplifies input from the microphone if
I use the swijtjch on the tuning hammer.  It's never a problem in the summer,
only the winter.

To prevent this, 100%, get a grounding wrist strap from a computer supply
store. Put the band around your wrist and connect the other end to the
strings.  Because the strap has 1 million ohms of resistance, you can't
electrocute yourself even if the plate of the piano were grounded.  What the
strap does is allow static discharges on your body to be dissapated by the
plate.

I now use the foot switch, held in my hand, and do not use the tuning hamer
switch. It usually works.  If you use just the switches on the tuner, it will
seldom turn off.  However, it does sometimes. The strap technique is the only
thing that seems to work.

I tried to get Sanderson to give me a copy of the schematic diagram for the
unit. A friend of mine is an expert in noise abatement, and offered to see what
he could do. Unfortunetely, Sanderson declined...seems he's very afraid of
people cpoying his work.  Too bad! The only complaint I have with the accutuner
is it's poor design in regards to sensitivity to electro static dishcharge
(ESD).





Tuner1956@AOL.COM wrote:

> Hello Friends,
> I recently have had some trouble with my ACCU TUNER shutting off during
> tuning.  I have never had this happen before if any one has any information
> why this would do this please let me know what is going on.

--

Frank Cahill
Associate Member, Piano Technicians Guild
Northern Va