Powersoft K8

[ultra]

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]

any have a service manual ?????

 

[tomi]

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]

U4 is LM7915, 15 volts negative regulator.

 

[ultra]

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]

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]

hi. if interested!!!

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

 

[Rudi76kediri]

hi all..!!

any have schematic powersoft 5000/7000..?
i have trouble with this device.

thank's for all member..!
please send for file to my mail.
joerudi1976@gmail.com

 

[adishor_2005]

hello do you still have this powersoft amplifier? i have a problem with mine there are 2 blown zener diode and i cand't see the value, the position of the diodes in the board it's marked on the picture...

 

[rivulet]

Powersoft Digam 5000-7000

hi,

any have schematic powersoft 5000/7000..?

thanks a lot

mail: rivulet@volny.cz

 

[marslideniz]

hi all,
any have schematic powersoft 5000/7000..?
please send for file to my mail.
marstangelenadam@gmail.com
please send for file to my mail.
thanxs.

 

[mgee]

Can anyone help with quality pictures to see k-cntrl component side. Both side of kfrnt the display and buttons. The top card board and components. I'm also struggling with the kalsu for PSU. I also need clear picture s of both side to see tracks connections. Please email me at mgee626@gmail.com

Thanks you guys

 

[NMOS]

Sorry cant help but have a question

Is Powersoft K8 Halfbridge or Fullbridge Amp ?

Pictures look like Halfbridge with very much Elko Capacitors to avoid Bus Pumping

What is Rail ?

 

[mgee]

It's half bridge

 

[NMOS]

It's half bridge

Any idae how much Rail +/- ?

what output mosfets ?

 

[mgee]

+/-175v remember there's step up to upgrade k series

 

[mgee]

The upgrade is not done by increasing output voltage supply from PS. It is done by sort of out put attenuation limit. It is between input attenuates or volume control and the amp power input circuit

 

[NMOS]

+/-175v remember there's step up to upgrade k series

+/- 175V very high with huge switching losses in IDLE

Amp perfect for bass

But High Voltage Mosfet will be slow with high rise and fall times

clarity will decrease in Mid and High


I like to know switching Frequency ?

I think something between 200 - 250 khz.

Does somebody want have schematic from K series ?

 

[kipman725]

I believe at least some powersoft amplifiers use variable rail voltage:
R&D Stories: Future Shock. Powersoft Audio’s Amplifier Technologies | audioXpress
so even if your measuring +/-175 this might be reduced before the output transistors?
would be interesting to see a schematic.

 

[mgee]

Please share with us schematics
mgee626@gmail.com