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Old 8th April 2012, 01:33 AM   #11
DREW028 is offline DREW028  United States
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Out of the circuit both r30 and r40 test fine. I cleaned the board up some more and I can see the traces better.
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Old 9th April 2012, 09:06 AM   #12
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Readings in the 900 range would be a bit high but doesn't necessarily mean it's defective. FETs with higher RDSon specs generally also have somewhat higher readings when checking the intrinsic diode (the 0.4-0.9v readings) compared to the FETs used for power supplies.
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Old 13th April 2012, 02:17 AM   #13
DREW028 is offline DREW028  United States
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Does anyone know what q34 is?

1 pin is tied to ground and a 470ohm resistors (r24).

The other side of r24 is tied to another 470ohm resistor (r34) and a diode (d33) and the signal for the gate

The other side of r34 goes to the another leg of q34

D34 goes to the other leg of q34 and traces back to the gates of the power supply transistors q35 and q36.
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Old 13th April 2012, 02:24 AM   #14
DREW028 is offline DREW028  United States
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Brandes was correct about something being shorted. After removing q34 and q33 the resistance of r40 and r30 were the same.
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Old 13th April 2012, 02:58 AM   #15
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If you post a good quality photo of the area, it will make it easier to help you.

What is the part number on the face of Q34?
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Old 13th April 2012, 03:35 AM   #16
DREW028 is offline DREW028  United States
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Asg? 4sg? It's very small I can't see it clearly even with a magnifying glass.
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Old 13th April 2012, 11:52 AM   #17
DREW028 is offline DREW028  United States
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I emailed you the picture Perry.
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Old 13th April 2012, 11:58 AM   #18
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ASG is a KTA1504. I generally use the MMBTA56 as a substitute.
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Old 13th August 2012, 02:54 AM   #19
DREW028 is offline DREW028  United States
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Well, I've been away a while but have been busy. I got this amp working and sold it to a friend. Today he called me saying that the amp would turn on in phases. After about a minute the sub and rear speakers would turn on and then a few minutes later the fronts would turn on. A quick visual inspection 1 of the power supply FETs for the sub channel was toasted. When it did turn fully on everything sounded ok.


He did say he noticed this the day after he was having trouble with his battery. I'm just curious if the amp was bad and was draining his battery or if its possible it shorted after the jump start.

Last edited by DREW028; 13th August 2012 at 02:59 AM.
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Old 13th August 2012, 04:24 PM   #20
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If only one of the power supply FETs failed, it's possible that the amp could have drained the battery. This is uncommon but it happens occasionally.

Did you cut the defective FET out of the circuit?
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