Author Topic: 48V Problem  (Read 1564 times)

Riff Raff

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Re: 48V Problem
« Reply #15 on: February 23, 2023, 05:05:27 PM »
I changed the switch, but it's the same. I still got the 48V shut down when I switch on the center section.

horizonsound

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Re: 48V Problem
« Reply #16 on: February 23, 2023, 10:30:30 PM »
I've also remembered, the 48V on the master section switch also feeds the meter distribution board (6way BICC), keyboard / Total recall bus driver (6 way BICC), and the producer panel (12 way BICC).
Though not used at any of those points, it could be shorting on the receptacle pins on each board. Long shot, but worth checking.
Unplug all of those and see if the problem remains.

Check continuity whilst unplugged and switched off, between +48V and ground at any of the plugs.

Anthony,

Riff Raff

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Re: 48V Problem
« Reply #17 on: February 24, 2023, 04:26:18 PM »
Hi, I found the shortcut.
It was the plasma bargraph. When I put it out of the circuit, the 48V works right.
Thanks a lot.

Riff Raff

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Re: 48V Problem
« Reply #18 on: February 24, 2023, 05:53:49 PM »
Last question: is it ok to have only 43V instead of 48V on the inputs ?

horizonsound

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Re: 48V Problem
« Reply #19 on: February 24, 2023, 08:51:22 PM »
That's really interesting, as the 48V should not be on the B5 connector to the bargraph motherboard.

Anthony.

Riff Raff

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Re: 48V Problem
« Reply #20 on: February 24, 2023, 10:06:27 PM »
This LR output bargraph have been added to that console; it's custom made. The bargraph is fed in 48V (+24V) and I think the 48V comes directly from the switch (though I didn't check that).

Richealey

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Re: 48V Problem
« Reply #21 on: February 25, 2023, 03:33:28 PM »
You can always adjust in your PSU to get 48V out. Just make sure you're adjusting the "Set Voltage Out" pot.

Riff Raff

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Re: 48V Problem
« Reply #22 on: February 26, 2023, 07:55:42 AM »
Thanks.

Dave Dicson

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Re: 48V Problem
« Reply #23 on: February 27, 2023, 04:23:37 PM »
One of are 4K SSL's also has had Bargraph meters added to the quad bus, but they have there own external power supply.