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I am getting a sound akin to that which a small, metal whistle (the kind which has a small ball bouncing around inside it) makes as output when I power up my 1745M. I’ve already replaced all 3 large filter caps in the power section (C3,C4,C5), with no evident fix. I’m now focusing on a suspicious-looking scorch mark on the PCB’s top surface, around the “+” via of BR1. Could, possibly, one (or more?) open diodes in any of these 3 bridge rectifiers also cause this shrill whistling? I’ve been doing a TON of reading on various troubleshoots, and I am steadfastly resolved to never give up on resuscitating my 1745M. Thank you very deeply for any assistance/advice rendered me.


John G.

Caldwell, NJ