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Old 3rd April 2012, 02:51 AM   #1
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Default 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?
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Old 3rd April 2012, 03:12 AM   #2
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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.
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Old 3rd April 2012, 09:46 AM   #3
timwebb is offline timwebb  United States
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If u use them I wouldn't use a heavy load. I always change the drive transistors when I change the output transistors.
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Old 5th April 2012, 12:55 AM   #4
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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?
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Old 5th April 2012, 01:15 AM   #5
timwebb is offline timwebb  United States
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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
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Old 5th April 2012, 01:18 AM   #6
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Can you post a photo of the inside of the amp?
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Old 6th April 2012, 12:24 AM   #7
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Old 6th April 2012, 12:32 AM   #8
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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?
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Old 6th April 2012, 01:47 AM   #9
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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

fets
1:2.76
2:10.1
3:0.00
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Old 6th April 2012, 03:05 AM   #10
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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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