(Topic ID: 209291)

NBA Fastbreak Shot Clock Not Displaying

By mrdude

1 year ago

Topic Stats

  • 7 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by OLDPINGUY
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#1 1 year ago

I picked up NBA Fastbreak with the Shot Clock known to be not displaying. I've done minimal troubleshooting at this point but I wanted to have a thread regarding it since I didn't see anything in my search.

The only thing I've done so far is check the voltage which it is getting, but I need to check the manual for the proper voltage. I registered about 15vdc at the connector. I'm going to start checking the boards for simple stuff like continuity at the moment. There is a transistor on that board as well which I'm horrible at remembering how to check. I swear I have to look it up every time.

If anyone has any tips, please feel free to let me know.

#3 1 year ago

It displays nothing. I checked the voltage and it's supposed to be 12v, but it's coming in at 15v. In my opinion that's too high, but I'd think that it should still display?

I found a crispy resistor on the Power Driver board, R249. But that looks like it's in the circuit for the Coin Counter. Although, I could have read that schematic wrong.

I checked continuity on the LED board (not the one with the displays) where the header is and continuity seemed good. I can reflow the header, but I doubt that's the issue at this point.

#4 1 year ago

So far I've reflowed the headers on the LED display and driver boards with no luck yet.

#5 1 year ago

I just checked voltages.

Pin 1 - 12v (unregulated?) - 15v [mine]
Pin 2 - Ground - Good
Pin 3 - Blank
Pin 4 - Shot Clock Enable (12v) - 11v [mine]
Pin 5 - Shot Clock Count (12v) - 11v [mine]

So as far as I can tell, everything is coming in the way it is supposed to, so I'd say I can relegate the problem to either the display or the driver board which they have listed as solenoid #39 and #40.

All of the header pins on J1 & J2 (the connector that directly connects both boards, 16 pins.) had 11v going to them except for the grounds.

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