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ian33 3rd April 2012 02:51 AM

hifonics hifi1000.1d
This amp came in with two shorted output and some leaky PS FETs
I replace all PS FETs and remove the shorted output.Amp has + - 21.23
on the center leg of the rectifiers is that normal?Rail caps are rated for 60v.The out puts are IRF640n can i used irf540n or any other fet for test? 3rd April 2012 03:12 AM

I have use Fairchild FQP19N20 in Rockford amps, not sure if the hifonics would like it or not.

The IRF540N is only rated at 100V, not 200 like the IRF640N.

timwebb 3rd April 2012 09:46 AM

If u use them I wouldn't use a heavy load. I always change the drive transistors when I change the output transistors.

ian33 5th April 2012 12:55 AM

Do i need to change all to 540 or i can just mix it with the 640

so the 21.23v on the rectifiers is high enouth?

timwebb 5th April 2012 01:15 AM

i wouldn't mix them. the voltages are different. i think it would be safe to use all 540's. for 1000w amp 21v sounds about right

Perry Babin 5th April 2012 01:18 AM

Can you post a photo of the inside of the amp?

ian33 6th April 2012 12:24 AM

2 Attachment(s)

Perry Babin 6th April 2012 12:32 AM

Are you sure that the power supply is working properly? I would expect more rail voltage for this amp.

Do you get a different rail voltage is you place the black probe on the negative speaker terminal?

ian33 6th April 2012 01:47 AM

Same voltage with black probe on negative speaker terminal.

I think the power supply has a fault.I remove the rectifiers and the AC voltage coming to the pads is plusing up to about 53v.The power supply fets getting hot


Perry Babin 6th April 2012 03:05 AM

Does your meter generally read approximately 5v DC on the gates for an amp without a regulated power supply (or in an amp without the PS FETs in the circuit)?

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