Friday December 15, 2017


Smart Ball Alley Fixed!
  Posted by: AceBHound on Nov 4th, 2012 9:38 AM
I finally got a chance to pull the MPU board again from the Smart Ball Alley and tried replacing a few components I had bought end of last year to fix the missing sound on the game. I had already replaced the power amp & pre-amp, couple of capacitors, ROM socket and a logic IC that was bad. So I decided to order a a 24mhz crystal oscillator used in the sound circuit & also a DAC (digital analog converter) IC. I replaced the oscillator first and still had no sound. Then I replaced the DAC chip (which was basically the next IC down the line from the pre-amp). After that sound was restored!

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