You mean the coil is staying energized after it tries to reset the bank? Or is the reset mechanism just jamming in the up position? If the transistor is bad, the coil will usually pull in as soon as you turn on the power. Rick
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You mean the coil is staying energized after it tries to reset the bank? Or is the reset mechanism just jamming in the up position? If the transistor is bad, the coil will usually pull in as soon as you turn on the power. Rick
I dont think ive ever seen a momentary driver kick on and stay on like an SCR. Lets see what he says. Of course we gotta remember the coil was burned to start with.
yes and thats about the most common problem you can have on those. Since the old coil was burned up, you will need to replace the shorted driver. should be transistor Q5 if this is the upper left bank, and you should be good. Check make sure you have correct fuses on the solenoid power cause it should have blown instead of smoking the coil. may be a fuse under the playfield too.
You have some MPU bus issues as well as some connector problems. Your MPU may need a rework. Try carefully reseating chips on the MPU with the battery removed. Connectors to suspect are lower left on MPU, and both connectors on the right side of the regulator driver board. If any of these reseats change things, you probably need to replace some terminals in those connectors and reflow the pins on the boards. There could be some old battery damage that is just starting to affect some components. U8 and U13 cause strange symptoms in that stern system since it uses them in a different function than bally or earlier stern boards (not just for memory backup, like it stores controlled lamp status data during operation, etc)
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