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Old 3rd September 2011, 07:37 PM   #1
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Default SPL ZX1-3000D

To keep from jumping the Dr Zeus thread, I'll start my own.

R101, C101 by the RCA jacks are cooked. Any idea on values?

Cory
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Old 3rd September 2011, 09:10 PM   #2
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0.1uf and 220 ohms.
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Old 4th September 2011, 03:14 AM   #3
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Is it possible to populate only a portion of the P.S. fets? All of the outputs are pulled, just to check functionality of the supplies. There seems to be two banks of fets Q313-323 and Q413-423, two transformers and 4 rectifiers. Two supplies??
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Old 4th September 2011, 06:27 AM   #4
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At the minimum, you need to have one FET per primary winding.

I don't remember what the amp looks like but if it has two transformers, it likely has two independent power supplies.
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Old 6th September 2011, 01:53 PM   #5
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I have the power supplies running with only have of the fets, fine for now. I am looking for 1023 and 1027 transistors from the driver board. There are resistors and transistors bad on this card, basically just want to replace all of the discretes. Should I be looking for another name 2sc1027? Avnet, mcm and digikey do not have them.

cory
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Old 6th September 2011, 02:16 PM   #6
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I generally use the BD139 and BD140 as replacements for power supply drivers when those transistors fail.

If there is a K as the logo, the part number is likely KT... instead of 2S...
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Old 6th September 2011, 02:33 PM   #7
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Fairchild has a cross of KSA916 and KSC2316, this would be for the output stage.
KSA916---->KTA1023
KSC2316---->KTC1027
The BD139 and BD140 will work for the output stage as well?
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Old 6th September 2011, 03:55 PM   #8
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If it's for the output stage, use the fairchild components if they're identical to the originals.
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Old 13th September 2011, 01:55 AM   #9
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Any ideas what value R173 is; on the driver board. R172 is a 550ohm and I believe R173 should be the same except it was fried beyond recognition.
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Old 13th September 2011, 02:38 AM   #10
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560 ohms.

If you have the DVD, the photos of a similar board are linked under item 12 on the class D - type 2 page.
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