The Syil X4s were usually fitted with a Tonman BoB, which I also had on my machine. I gave up with the charge pump. It never worked however I set the jumpers and Mach3. Then the BoB just failed for no apparent reason and I had to replace the BoB and the drivers as the drivers were connected by a ribbon cable. All this is in my post http://www.mycncuk.com/threads/7658-...down-like-this.

The point is that if you have the Tonman BoB, you might as well bite the bullet and put in a new BoB and drivers.