Sttng, tie back wire

[Thomas Allcott]

Hi
Could someone take a look at these pics and confirm that the tie back wire is on the wrong coil please ? I've recently bought this machine and since I replaced the switch on the Borg drop down I've been having coil burn . After looking on the web I found out about the tie back wire . Strange thing is I've not moved that wire and the machine was not burning the coil when I first got it , Any help would be greatly appreciated
One other thing , when I test a transistor from the metal tip to earth should there be continuity , I'm not sure on the point to test on the transistors ?? I have a feeling there may be a few faulty on the 8 driver PCB assembly

Thank guys

Tom

 

[strobey]

Hi Tom,

The tie back wire can attach to ANY of the 50V lugs on any coil, but the drop target area is the closest, which is why they're used. So for you, either is fine.

Since the tieback wire is a smaller gauge, it tends to break off the coil. The tieback wire is required to keep 50V on the AUX8 pcb (upper right corner of the backbox) and was a nasty last-minute hack by Williams.

If the 50V is not fed to the AUX8 board, the transisters get damaged and start to fail, locking on coils permanently.... then meltdown ensues.

Even though your tieback looks good, it is likely you have a bad transister on the AUX8 from when it previously became disconnected.

Pull that board out and meter out the trannys.

The recommendation for this factory bodge is to remove ALL of the purple wires from the coil which hosts the tieback, crimp them all together, then run a SINGLE wire back to the coil lug. That way, if the wire breaks away from the coil again, the tieback remains connected and the AUX8 is safe.

This is the only pin that uses an AUX8 board and features this factory-bodge.

Hope that helps,

Tim

 

[Nickbs]

Hi Tom,

The tie back wire can attach to ANY of the 50V lugs on any coil, but the drop target area is the closest, which is why they're used. So for you, either is fine.

Since the tieback wire is a smaller gauge, it tends to break off the coil. The tieback wire is required to keep 50V on the AUX8 pcb (upper right corner of the backbox) and was a nasty last-minute hack by Williams.

If the 50V is not fed to the AUX8 board, the transisters get damaged and start to fail, locking on coils permanently.... then meltdown ensues.

Even though your tieback looks good, it is likely you have a bad transister on the AUX8 from when it previously became disconnected.

Pull that board out and meter out the trannys.

The recommendation for this factory bodge is to remove ALL of the purple wires from the coil which hosts the tieback, crimp them all together, then run a SINGLE wire back to the coil lug. That way, if the wire breaks away from the coil again, the tieback remains connected and the AUX8 is safe.

This is the only pin that uses an AUX8 board and features this factory-bodge.

Hope that helps,

Tim

One of the great great things about this forum is that you can come across helpful posts like this, read it and be pretty certain it contains helpful, authoritative advice to those who understand it whilst actually understanding very little if what is actually being said