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No inrush current?
No inrush current?
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Old 16th September 2019, 06:50 PM   #21
redrooster is offline redrooster  Australia
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Quote:
Originally Posted by Ian Finch View Post
If the rail voltages rise to within spec, then there has been an inrush current but maybe that was some time back. Unless there is a leakage path somewhere, the amp may hold its PSU charge for quite some hours. I have been bitten by amps with a lot of smothing capacitors but were last operated the previous day or earlier, so they can indeed hold their charge. In other words, don't assume that all power supplies are connected and charge/discharge the same.

Why not check by measuring the rail voltages before you hit the power button?
I checked the rails, there was no voltage on them.
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Old 16th September 2019, 07:07 PM   #22
redrooster is offline redrooster  Australia
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Quote:
Originally Posted by indianajo View Post
I used a 1800 W room heater element as an AC limiter on my PV-1.3k. (tip over switch of heater was bad) Else with a 100 W bulb limiter it wouldn't get enough AC to make the op amps work. You don't get the bright light diagnostic that something is wrong, but you can use another DVM to monitor the AC voltage as an indicator. This amp looks at least that big.
Yes, that seems to be what's happening here. I will check things out some more before the switch to mains. Just to be sure? This is unknown territory for me.
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Old 17th September 2019, 06:57 AM   #23
redrooster is offline redrooster  Australia
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Found the problem it was a broken track on one of the power supply capacitors. I must have knocked it at some stage? It was causing enough brightness to overshadow (if that's the right word) the inrush current. I started unplugging the power to each of the equalizer boards until I got to the last one of the driver boards and the DBT dimmed a bit and the relay clicked in so I knew it was there on the left channel driver power supply. Thanks for all the ideas and suggestions fellas. It's a hard one when the amplifier is not there in front of you but I learned a few things along the way. Sorry if I didn't answer every post. Thanks again.
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Old 17th September 2019, 10:55 AM   #24
Mooly is offline Mooly  United Kingdom
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No inrush current?
Good to hear you found the problem
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