WOZ power supply board defects

This is one of those repairs that reveals something… in this case a manufacturing defect.

My WOZ started smoking one night and then stopped working. After examination, we found this..


What apparently happened was a choke/coil on the power supply board overheated and failed, taking out miscellaneous other components with it. This happened around the same time I did a new software update, so I was concerned it might have been triggered by software, but upon further investigation, this was not the case and just a coincidence.

Upon talking with the folks at JJP, they are aware of the problem and it’s a defect in the power supply board, using an under-powered choke.  Supposedly they fixed this but some games got out with the old choke.  It’s not a question of “if” it will fry, but “when.”  What’s worse is, if this goes out, it apparently has a tendency of taking out numerous other boards including the CPU and the display driver board.

New and old boards

You can see the difference in the size of the choke on the newer (left) power supply board verses the older one (on the right).

Unfortunately, for many of us, the game is likely to be out of warranty by the time you find out you have the old board.  You should check and see, and contact JJP before it costs you much more.  They may replace boards even if they’re out of warranty.

First Look: Game Plan Sharp Shooter II pinball


Lately I have been adhering to a self-imposed moratorium on picking up any more pinball machines. Honestly, I’ve really been doing my best to avoid it, and the fact that so few show up in my area makes that easy, so when a friend-of-a-friend said they knew someone with a game in their garage they wanted to get rid of, it was worth a look… here’s the video and info on my acquisition of a relatively rare game, albeit in questionable condition…

Game Plan’s Sharp Shooter II is an interesting game… I have never owned a Game Plan game before so this is all new to me and the technology is different. Watch along with me as I fumble around seeing what the deal is with this crazy garage pickup…