Color Change SWF 1204-A/UK

Hi
I have a problem with the color change
SWF 1204 A / UK
ENGINE CRAWLING
And replace by a new engine and the fault persists
I already tried without heads and follows the failure

Someone who can help me find fault
I think that is the card but no longer manufactured
I think it replaced with a new but do not have the part number
Thanks for watching

Location: 
United States

You means When color change , it makes grind sound and no change ?

If yes , You need replace the power board.

I had a same problem on single head.

check on e-bay . search "circuit board repair"

It could be the power board but it is probably the joint board. I have a B series 4 head doing this right now. It has a bad transistor on the board. Good luck finding a joint board for a A Series. The revised board SWF now has doesn't have the right connectors and correct number of plug ins.