From Oakley Sound via analogue Sent Fri, Jun 29th 2018, 09:58
From Oakley Sound via analogue Sent Fri, Jun 29th 2018, 09:58
Some time ago I had to replace a 4010 module in an old all metal 2600. After not having any luck in obtaining schematics and considering trying to remove the epoxy, I eventually decided to replace the module with one of my own invention based on the 4019 but with the pin out of the 4010. And through that work the Oakley Classic VCA module was born. I was certainly interested in finding out what went into the 4010 but I wasn't curious enough to start playing around with horrible chemicals. Colin Fraser has done it with all the Yamaha modules found in the GX-1, SY-1, etc. But it was a laborious task for him. He found the best way was to take just the lower section of epoxy between the board and the bottom surface of the module. He then cut the PCB tracks to the now revealed solder pads and with a component tester ascertained what component and what value it was. Thankfully, later ARP modules were filled with silicone with only an epoxy seal that could, with care, be picked off. But those early ones are solid epoxy. Tony www.oakleysound.com