Powersoft K8

ultra · 10th November 2012, 08:38 AM

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

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

12th November 2012, 09:17 PM	#3
tomi diyAudio Member Join Date: Dec 2004 Location: Aberystwyth and Manchester, depending upon term times.	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. __________________ The Geek shall inherit the Earth.

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11th November 2012, 04:53 PM	#2
gatabil diyAudio Member Join Date: Nov 2006	any have a service manual ?????

13th November 2012, 12:43 AM	#4
DjLeco diyAudio Member Join Date: Oct 2006 Location: Bucharest, Romania	U4 is LM7915, 15 volts negative regulator.

14th November 2012, 01:18 AM	#6
DjLeco diyAudio Member Join Date: Oct 2006 Location: Bucharest, Romania	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!

18th November 2012, 04:48 PM	#7
gatabil diyAudio Member Join Date: Nov 2006	hi. if interested!!! powersoft digam schematic d7000 link is... Salida Digan 7000