Blown tracks on sys 11 interconnection board

[beaky]

I went over the flippers on my bk2000 and after cleaning and adjusting all the eos's, cleaning flipper button contacts + cleaning all the grease off the plungers & replacing sleaves. (just getting the flippers going to the best that can be untill i put flipper kits through it).

i was curious why there was an added cable that went from the flipper power on the aux board to one of the solder lugs on the right flipper coil.
So i cut it and of course the right flippers stopped working. after tracking the fault to the interconnection board. none of the plugs where burnt or showing any sign of heat stress.
So i removed the board from the pinnie and found the track for the right flippers burnt and the one for the left burnt but has been repaired with a jumper wire soldered from the top plug to the bottom plug under the pcb. so of course i did the same for the left.
i removed the added cable from the aux driver board. the bare end of the cable was just pushed in to one of the holes in the bottom of the plug and then the plug had been pushed on to the headers on the board (as per sample pictured below) and removed the wire from the pinnie.
powered it up and presto the right flippers work.

I have made sure the right value fuses were in the fuse sockets.

I have never seen this fault on a system 11 before but i am assuming others have had it.

I am assuming at one stage it has had faulty coils or faulty diodes on the coils and some one has put higher value fuses in because the fues was blowing. 

any way the flippers have more power and are working properly now so until i strip the whole pin down and then (after the restore)install the new flipper kits.


I have set up the picture below to show you how the wire was connected to the aux board

[johnwartjr]

I believe that's the aux power driver board, the interconnect would be the long skinny one under the CPU.

Blown traces are almost always related to overfusing or poor rework. I'd bet overfused and/or bad diodes on the flipper coil.

It always amazes me how people will do more work to hack something than it would take to do it right!

[beaky]

I believe that's the aux power driver board, the interconnect would be the long skinny one under the CPU.

Blown traces are almost always related to overfusing or poor rework. I'd bet overfused and/or bad diodes on the flipper coil.

It always amazes me how people will do more work to hack something than it would take to do it right!

that is the aux power driver board pictured. they totaly by passed the interconnection board all together (the board and wiring loom in the picture are spares as i didn't take a photo of the 'repair' before i removed it)