Soudcraft Spirit M12 mixer schematic please

[zen]

Hi all

This is my next project .

Rebuilding PSU & require values of R36 & R47

Both measuring around 650R .

[zen]

Re: Soudcraft Spirit M12 mixer schematic please

Pcb no - sc4105-05 legend

[zen]

Re: Soudcraft Spirit M12 mixer schematic please

Found this site

Looks like they have been replaced using 680R types

http://studiorepair.com/gallery/Soun...612145982.html

[zen]

Re: Soudcraft Spirit M12 mixer schematic please

R17 also cooked . Connected to pin 6 of IC6 ( UC3842AN ) , which is faulty as well .

Can anyone help with the value ?

I'm guessing 22R or 220R ( see picture )

[zen]

Re: Soudcraft Spirit M12 mixer schematic please

Pulled datasheet for the UC3842AN & pin 6 is the gate drive output to FET .

Diagram shows resistor as 22R ( see link )

https://pdf1.alldatasheet.com/datash.../UC3842AN.html

[zen]

Re: Soudcraft Spirit M12 mixer schematic please

R24,r27 & r35 , all 1r o/c

[zen]

Re: Soudcraft Spirit M12 mixer schematic please

Last , but by no means least FET 1 ( P7NB60FP ) , S/C . Manufactured by ST Electronics .


With PSU in stand alone , gradually increased AC supply using the variac .

No big bangs which is good & all secondary supplies seem to be present .

Will fit PSU back into mixer next week , when i have some free bench space to test fully .

[zen]

Re: Soudcraft Spirit M12 mixer schematic please

Also , before i forget , the two 47MF ,50V electrolytic caps on primary side of chopper required replacement due to poor ESR .

[redwire]

Re: Soudcraft Spirit M12 mixer schematic please

D2 looks cracked, broken and possibly part of the snubber network

[zens electronics]

Re: Soudcraft Spirit M12 mixer schematic please

Hi redwire , yes it does in the picture but it's absolutely fine .

[Khron]

Re: Soudcraft Spirit M12 mixer schematic please

Anything useful here?

https://elektrotanya.com/showresult?...a=All&kat2=All

[zen]

Re: Soudcraft Spirit M12 mixer schematic please

Thanks Khron , will check it out , although seems to be all sorted .

Just need to fit PSU back into mixer & test .