(Topic ID: 308524)

Solenoid issues Bally Rolling Stones

By setzkor

2 years ago


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  • 17 posts
  • 7 Pinsiders participating
  • Latest reply 2 years ago by barakandl
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#12 2 years ago

Logic probe during solenoid test will quickly show if the decoder is ok. These pulses are slow enough a DMM on volts DC is fast enough. Make sure all inputs from the MPU reach the decoder chip A B C D pins. Basically make sure each ones changes state at points during solenoid test. If it is always 5v, then the connector for that signal is likely bad somewhere between the MPU and driver.

If I would guess driver J4 has cracked solder joints based on my history. The decoder very rarely fails, even when solenoid transistor burn holes in the board.

#17 2 years ago
Quoted from setzkor:

I can confirm that was the issue. I did also notice the other spot it was lifting and reinforced that as well. It seems as though the copper just pulled away from the board, I'm assuming due to flexing.
Thanks all for the assistance

single sided PCB with out the plated through holes helping to anchor. TO220 transistor vibrating eventually pulls off the glue of the trace. Maybe re-tin and try and super glue the trace back down.

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