[sdiy] Grounding check (OT)

[René Schmitz]

Hi Dave,

> I tried doing what Rene outlined below, and I measured the resitance
> between the strings and recepticle at about 680 ohm. I note that this
> only exists when going through th e effects processor, sending the
> guitar directly into my mixer I'm measuring zero ohm, so it's
> obviously the effects processor that has the problem since I had
> nothing else in the signal chain.
 >
> The effects processor I am using only has a two-pronged plug (it's
> the stock cord so I'm assuming that's the way it should be). Anyone
> have a suggestion how to rectify this (perhaps I ought to just take
> it in for servicing) or would I be best off using the cap and
> resistor between the hot and ground on the guitar itself?
> 
> Thanks again! Dave

Haveing a two-prong plug means that the transformer must be a doubly 
insulated type (class 2 IIRC), and that there must be no direct 
connection between the neutral or hot, and any part of the circuit. 
(Mind you this is the European standard, things in North America might 
be a little different.)

So this suggests it is either bad design, or a faulty transformer. (Or 
an unsuitable replacement.)

I would bring it in for service.

Cheers,
  René

-- 
uzs159 at uni-bonn.de
http://www.uni-bonn.de/~uzs159