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Having repaired a couple of Doctor Who (Bally, 1992) machines, I've found that the Time Expander mini playfield always needs to be rebuilt. There are two main parts to this:
This is a small write-up of how I approach these repairs and what the end result looks like.
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Up until recently I had been putting up with some strange display issues on my Doctor Who (Bally, 1992) and Judge Dredd (Bally, 1993). Each game worked well enough but there were artifacts on the display that should not normally be present. Since I was about to sell the Doctor Who, I decided to finally figure out the issues with both display driver boards. I also figured it would be a good opportunity to write a general instructional post about integrated circuit replacement on a circuit board.  The WPC dot matrix display driver board. |
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Here you will find logs of our pinball machine restorations, repairs, discussion about general pinball topics, and recounts of our random pinball adventures.
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Running this website is a hobby for me, just like pinball. I like being able to show my restoration work to everyone so that others can learn from it and learn to fix their own machines. If you enjoy reading the content, please consider donating to offset some of the website's operating costs.
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