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Old 10th November 2012, 08:38 AM   #1
ultra is offline ultra  Greece
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Default Powersoft K8

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.
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Old 11th November 2012, 04:53 PM   #2
gatabil is offline gatabil  Turkey
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any have a service manual ?????
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Old 12th November 2012, 09:17 PM   #3
tomi is offline tomi  Wales
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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.
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Old 13th November 2012, 12:43 AM   #4
DjLeco is offline DjLeco  Romania
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U4 is LM7915, 15 volts negative regulator.
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Old 14th November 2012, 12:24 AM   #5
ultra is offline ultra  Greece
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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.
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Old 14th November 2012, 01:18 AM   #6
DjLeco is offline DjLeco  Romania
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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!
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Old 18th November 2012, 04:48 PM   #7
gatabil is offline gatabil  Turkey
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hi. if interested!!!

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