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Old 28th August 2012, 11:32 PM   #11
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Yes they all seem to be getting good signals and they are all the same.
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Old 28th August 2012, 11:49 PM   #12
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There isn't much that can load the power supply if the output transistors are out of the circuit (I'm assuming that you don't have any solder bridges between the pads). It's possible that there is a defective rail capacitor but that's unlikely. What are you using to power the amplifier?
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Old 29th August 2012, 12:18 AM   #13
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I am using a B&K 1745A bench power supply. No Didn't see anything when I was going over the amp after I took that diode array out. I didn't mention this before not sure if it really means anything or not but when i turn on the power supply the thermal light does flash for a brief moment then goes to the green led.
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Old 29th August 2012, 01:27 AM   #14
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Well I can replace that 1606G tomorrow at work i will just get one in the morning and see if that is the problem or not I dont think we carry these but I believe I found one that would be a good replacement. Is there anything else that is tied with that 1606G that i should check out? If not I will just replace that and put all the fets in check for solder bridges and I guess go from there.
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Old 29th August 2012, 01:16 PM   #15
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Measured all 8 fets in order g-d-s 6.09 v square wave 14.25 square wave and the source was 98.3mv. Are these values correct?
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Old 29th August 2012, 01:52 PM   #16
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I just noticed resistors r666 and r667 get really hot not sure if this is normal
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Old 29th August 2012, 08:52 PM   #17
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Installed new diode array same results over heating. Did some more checking and it looks like one of the output feats zener diodes could be bad d500 anyone know what the part number is on this?
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Old 30th August 2012, 07:14 PM   #18
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Post a photo of the gate waveform for Q600 and Q607.

The snubber resistors get hot.
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Old 31st August 2012, 03:22 PM   #19
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Alright I can do that. I will have to desoder the D600 before since that was the only way I can get any kind of waveform on this board then I will post the pics.
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Old 31st August 2012, 06:00 PM   #20
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First image is of Q607 Second image is of Q600
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