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Old 6th April 2012, 01:30 PM   #11
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yes,about 4 to 5vdc with fets out of the circuit

How can i no if the power supply is regulated?

I mostly work on chinese and korea made amps
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Old 6th April 2012, 04:10 PM   #12
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yes,about 4 to 5vdc with fets out of the circuit

**** Is that for this amp of for other amps?

It's difficult to tell if an amp is regulated or if a fault is causing the rail voltage to be lower than it should be.
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Old 6th April 2012, 06:49 PM   #13
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4 to 5v for other amps

This amp has 2.76

I removed half of the output Q204 Q214 and Q215.Rail voltage went up to 37.6v
I check all 4 output drivers out of the board and tested good.

PS FETS still getting hot out of the sink even when i pull both rectifiers
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Old 6th April 2012, 11:12 PM   #14
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I think i had a solder bridge on the output section.ALL outputs in circuit
I install two new rectifers rail voltage is - + 37.6v.

Amp has good audio but PS FETS still getting hot out of the sink.I put the board back
in the sink and run it for about 20min with 500w 4ohm speaker.It seems to be ok
but am just wondering how hot should PS fets get for class d amps get out of the sink?
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Old 7th April 2012, 03:53 AM   #15
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They will get hot, the package can only shed so much heat on its own.

sent from an IRFZ48N
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Old 7th April 2012, 06:31 AM   #16
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If they get too hot to touch within a couple of minutes at idle, there is likely a problem with the driver circuit. If they don't get that hot that quickly, it may be OK.
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Old 12th April 2012, 12:57 AM   #17
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The Fets get to hot to touch in less than a minute.I test all four driver transistor out of the board and they tested good.This amp has a little board in the power supply with the pwm IC on it .THe number on it is scratch out but i can see it has about two 00 on it can that IC caused that problem?
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Old 12th April 2012, 01:06 AM   #18
timwebb is offline timwebb  United States
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u checked the drive transistors?
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Old 12th April 2012, 01:08 AM   #19
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Do you have a scope?

Post a photo of the component side of the driver board.
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Old 12th April 2012, 01:11 AM   #20
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yes
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