Hi All -

I'm not the most electrical-inclined, and I'm experiencing quite a frustrating issue with my NBA Fastbreak. With social distancing in full effect, I feel this would be a great time for me to dive in and try to learn!

I picked up this NBA Fastbreak not working, so it's not acting up because of an issue or mistake that I have made. Upon start up, I noticed that F103 kept on blowing. I started to disconnect some of the coils feeding that fuse, and it seems most of my high power coils are locking on. Upon disconnecting one coil, the next coil starts to lock on. Now, the fuse will not blow, but coil 6, which is the upper loop gate stays engaged upon starting the machine.

If one coil was locked on, I would suspect I would check out the specific 'Q' transistor on the driver board, but this issue seems more widespread as it's affecting every coil being driven from connector J116.

Any help, guidance, or attention of any kind if appreciated! Apologies if above was hard to read - I've been self-handicapped having friends much more gifted than me, but what a time it is to be self reliant!

Thanks for the quick reply, Lloyd. I got excited, as if it was as simple as a ribbon cable being connecting wrong, that would have been a huge relief. I reseated every ribbon cable, checked to ensure they were aligned with the pins, etc., but same issue. I understand ribbon cables can sometimes fail, which my be the issue here, but anything else to check?

Also, I noticed that one leg on U7 is jumped to U8 on the Power Driver board. Not sure if that is a hack and is part of my issue, or if it's considered normal.

Hi Lloyd -

I actually didn't know about the red stripe until I read your comment again and check it out. Red stripe on all ribbon cables are on 1. For good measure, I reseated all ribbon cables again to ensure they were aligned. Same issue

Also, just swapped the ribbon cable going from the CPU to the Driver Board from my Scared Stiff, and same issue when all coils all hooked up, the left ramp diverted locks on and causes F103 to blow. If I disconnect the diverted, it moves to the next coil in the sequence.

Still struggling bump

Thank you both! Upon inspection, U7 is jumped to U8, and as that drives these coils, I’m thinking this is the culprit. Photos attached. This might be beyond my repair
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Yeesh, this might be beyond my comprehension. I also have a history of doing more bad than good when it comes to more invasive boardwork. Might be a job for a pro