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PSL KA2401 |
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Jakeeboy64 
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Joined: 31 October 2011 Status: Offline Points: 9 |
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 Posted: 06 November 2018 at 12:05am |
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Is it possible to replace the Inrush resistor with one with greater tolerances before it fails?
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kedwardsleisure
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4946 |
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Posted: 06 November 2018 at 6:55pm |
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Moving it away from the pcb is probably a worthwhile upgrade, so it can't set fire to it.
I was once called out to a machine that spot-welded gold foil to jet turbine blades. The inrush resistor was a 200W version of the (50W?)one used in the PSL. The welder had failed and the resistor had exploded so violently it dented the steel enclosure the transformer was in. I replaced that resistor with a couple of convection-cooled cement-coated ones. 
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Kevin
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Jakeeboy64
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Joined: 31 October 2011 Status: Offline Points: 9 |
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Posted: 06 November 2018 at 8:31pm |
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Hi there! Thanks for reply. It's funny you should suggest moving the resistor away from the PCB as I spoke to a friend today who is an electronic engineer and he suggested exactly that. He also suggested the possibility of fitting NTC current inrush limiter in the live supply. He also suggested I may be able then to remove the resistor altogether and bridge the pins but couldn't be sure without seeing the circuit diagram. He said it can also depend upon the relay circuit etc. Don't suppose you know where I can get a schematic? I have 2 of these amps. Many thanks Jake
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