Data East Star Wars CPU Board Repair and Upgrade

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Repairing a Data East Star Wars pinball CPU board that was unable to boot and initialise. Whilst repairing the initial fault, I also sorted out some transistor issues and finally upgraded the software to the latest 20th anniversary edition ROM (which is a huge improvement!)
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Very interesting!  I noticed there towards the end some purple looking beams going straight up, is that IR from some sensor or something?  It got me wondering if its possible to see CD or DVD lasers side on using a camcorder...  I would think that anything in the IR range might show?

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please, what tool is that pen you use to test the transistors?

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