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-   -   Powersoft K8 (http://www.diyaudio.com/forums/class-d/223264-powersoft-k8.html)

ultra 10th November 2012 08:38 AM

Powersoft K8
 
1 Attachment(s)
Hi all.
A Powersoft K8 came in for repair due to water damage.
Upon repairing a track on the underside of the pcb, i also found
a bad voltage regulator.
Unfortunately it is cracked open and i am not able to see which one is it.
I am referring to U4 in the power amplifier section.
Here is a pic that might help.

gatabil 11th November 2012 04:53 PM

any have a service manual ?????

tomi 12th November 2012 09:17 PM

You'll probably have thought of this, but is there an identical regulator doing the same job on the other channel?
I suppose looking at the voltage ratings of connected caps on the output would give you a ballpark idea of the o/p voltage.

I understand that powersoft are a bit cagey with their service data, unfortunately.

DjLeco 13th November 2012 12:43 AM

U4 is LM7915, 15 volts negative regulator.

ultra 14th November 2012 12:24 AM

1 Attachment(s)
Thank you.

I think i came to the same conclusion myself.

There are only multilayer capacitors in the input and output of the regulator.

I only knew for sure it was a negative type.

Thanks again.

DjLeco 14th November 2012 01:18 AM

Can you please make for me some GOOD QUALITY pictures of entire amplifier, divided in sections, from UP, so I can observe better what they do there?

Interesed to see inductor coils, output filters, storage capacitors, etc

Please sent on my email: claudiu971@yahoo.com


Thank you and good luck in repair!

gatabil 18th November 2012 04:48 PM

hi. if interested!!!

powersoft digam schematic d7000 link is...
Salida Digan 7000


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