Bandmaster ab763. Thump or "waa" sound when standby is disengaged.

[Jimmybjj]

Well, all techs make mistakes here and there so don't wig out on the guy.
It's hard to say if the backwards one is completely wrecked but, I think it will be stressed enough that I wouldn't trust it at all.
I'm not really sure about replacing both though. Maybe not.
The two capacitors form a capacitive reactive voltage divider at half the total capacitance (those swamping resistors across each one help with the division and swamp out any odd reactances either one of the capacitors might have so the voltage is divided better).
I'd call the guy and let him have an opportunity to buy/give you one new 100uf-350v cap and maybe do the reinstallation yourself.
That backwards cap could be the reason you are getting weird voltages.
The other ones are correct...

Thanks Bruce, I did call the guy and he sent me paypal for reimbursement of the caps. I want to thank you again for taking the time to help me with my issue. I replaced the cap, and everything is almost in exact spec with the schematic.

I also want to thank everyone else that help me with these issues, you guys are great.

[Enzo]

Bruce is right, we all make mistakes. I have been soldering for well over 50 years, and believe me, I come up with stupid mistakes now and then, and will in the future. The day I stop making mistakes is the day I retire. Or is that the other way around?

However, I am suprised your tech didn't note the results.


The backwards cap was stressed by the experience, it should certainly be replaced. yes, even if it SEEMS to work when turned around. On the other hand, the one in the right way never saw any reverse voltage or over voltage, so as far as I would think, it should be OK still.