You may have a failing 10uf cap on one of your other boards, pulling the supply down on startup(?). I had a Poly61 and a CX3 with leaky shorted 10uf caps, easy to spot as they will corrode around the solder pad. (Replaced all of them on the CX3)
I would check the programmer board if the 367 is all new. Hope this helps...
On January 27, 2019 at 3:26 PM "cwc@dircon.co.uk [PolySix]" wrote:
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HI Johannes, Thanks for your response. I have replaced all the electrolytic capacitors on the power supply including the two large 4700uf and 2200uf ones. Voltages are adjusted and spot on. Since my original post I have noticed that if I disconnect the harness from CN05 from the clone KLM367� (i.e. the connector comes from the patch select, write enable/disable and tape enable/disable part of the KLM371 Programmer Board), patch A.1 comes up without the problematic modulation when I turn the synth on.60;
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