Friday, 10 January 2020

Pinball judge dredd repair : too many balls

Here's a little post about my judge dredd. Issues as follows :

  • Two balls at start of games 
  • Judges mission does not end
  • Issue report on optocoppler 83 and other through ball chest
Apparently this is an issue for counting balls. Let's look at the pcb for the ball chest.

There are leds on it, called optocoupler. I connected 12V, to check if they work. Take your cell phone and check if they light up. Picture shows that 1, 4 and 7 are faulty.

For led 1 led resistor was broken at the end of the leg
For led 4 the led leg connects was broken.
 Led 7 was just detect.

After replacing the defect parts all described issues was solved.

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