PatA
Super Member
I'm pretty positive Merrylander started a thread on this topic, but I lost patience in searching for it, bad I know! Seems to me that he also explained how he accessed the bottom of the board, so I apologize if this is redundant. I removed the chassis side rail, unbolted the transformer and moved it aside as far as the wiring would allow. I then unbolted the brackets that hold both parts of the power supply, I'm able to flip the board over pretty easily. I have my cap list put together, and I also want to replace the power transistors, I believe they are TR712 and TR715, both are 2SD234R. The OnSemi site crosses these to TIP31G or TIP31AG. The TIP31G is rated at 40 volts, TIP31AG is rated at 60 volts. Is the 40 volt rating sufficient? Or do I need to use the 60 volt rated transistor? Thanks all.