Ugh, I heated up every solder joint on the board (minus LEDs) and resoldered any suspicious looking spots. Still, exact same voltages. At this point, what’s the cheaper option, ordering a new PC board and parts, or sending the unit it? Unless there isn’t something we’ve checked yet.
Eros phono final voltage test fail [resolved]
- Thread starter Nitsua08
- Start date
That is up to you. I can take this in for repair, but I will just flow out the joints on your board and be sure your tube set is working properly.
So I ordered a new board and components thinking maybe I damaged the board while soldering/desoldering the joints , removing and reinstalling components. I finished the new board and was extremely careful to ensure good joints. Still the exact same voltages.
I’m confident I can rule out poor solder joints on the board at this point. Is it possible anything upstream is the problem. All previous voltage and resistance test up to the C4S board have passed. So can we assume the problem is narrowed down to the area near/under the C4S board? Bad socket or resistor?
I’m confident I can rule out poor solder joints on the board at this point. Is it possible anything upstream is the problem. All previous voltage and resistance test up to the C4S board have passed. So can we assume the problem is narrowed down to the area near/under the C4S board? Bad socket or resistor?
If the voltage coming into the front C4S board from the rear regulator board is correct (around 220V), then that's the upstream stuff that could throw things off downstream. I would suspect there's a flaky solder joint on a socket or terminal strip at work here. Occasionally you will also find that debris can get into the socket and that will show as a dead short between two adjacent socket pins (though pins 4 and 5 on the front three sockets will show this anyway if any tubes are plugged in, so you can ignore that).
I got this Eros on my bench and found that everything was in its proper place, but there were a few broken wires, a solder joint or two that needed extra heat, a few terminals touching on the D socket, and possibly a 2N2222 that had given up during the testing phase. All is well now with this Eros after some new wires and reflowing most of the PC board joints.
