On Thu, Jun 28, 2018 at 04:53 am, Albert Otten wrote:
BTW: I had no patience to view the whole video. But I saw at 32-33 minutes that
the AC input voltages to the bridge rectifiers are measured. For +15 that was
1.3 V. I find this hard to believe. Apparently then there is nearly a short circuit
loading the transformer winding. I guess this would immediately blow the main
fuse?
I too struggled to watch the video, a bit too laconic for my taste I guess. I was somewhat put off by the ham-fisted removal of the bridge rectifier and the filter cap. Damaging the PCB because you didn't disassemble the 'scope to get at the PCB properly, why?
The suggestion that a MJE3055 would be a suitable replacement for the series pass darlington seems somewhat far fetched to me, with no attempt to look at the specs to find a close replacement. (And is it just me or was the darlington probably physically damaged during its removal?)
As a study of methodical troubleshooting and repair the video is a long way of the mark IMHO.
Cheers, Brian.
Brian Cockburn