Hi again,
I thought I would first take some measurements on the KLM-425 and found some
strange but interesting results
Power Switch turned OFF ON
Ground to Cold 0.11v 0.10v
Ground to Hot 242v 238.5v
Ground to Switch 242v 238.9v
(Closed Connector)
Ground to Switch 99.8v 238.9v
(Open Connector)
Ground to 1 0.10v 0.17v
Ground to 2 98.5v 239v
Ground to 3 98.4v 238.5v
Ground to 4 0.10v 0.17v
Looking at the Polysix Service Manual for KLM-425 with regards to
those measurements it makes me think that possibly the Spark Killer
has blown open so that even with the Power Switch Off, 98v is passing through. Or perhaps it could it be the Noise Filter
Having said that I also remember one thing I did earlier just before
this all happened. Just before I closed the top panel ready to try the
synth out, I had been worrying that the cables coming into and
out from the Toroid transformer were poking up a bit high and I
thought they might cause some interference, so I tried bending those
down out of the way, but now I am wondering if I have inadvertantly
damaged a wire or caused some kind of a short which is giving that
98 volts even when switch is OFF.
I will try desoldering the transformer and measure the noise filter
to see if the results are any different. If so I will order a new
transformer, but if no difference I guess it means the noise filter or
spark killer is bad, so will have to replace those, if I can find any equivalent parts.
Hopefully someone can shed light on this and advise which part is most likely to be bad based on my measurements.
Thanks again
Tim