Good day to everyone.

I am in the middle of trying to bring a 1980 Gottlieb Panthera back to life. In it's efforts to thwart me, the machine decided to blow a transistor (hopefully that is all) on the solenoid driver board at power-up. As I am not the best at working through an electronic road map, I was hoping for a little troubleshooting assistance.

First, does any one have a replacement part number for this transistor?

The transistor that released its magic smoke is located at Q53. As far as I can tell, this is the knocker solenoid. I tested the resistance at the coil and got about 5 ohm which isn't great but should be functional (again, I hope). It does not appear that any other coils in line with this. Is there any way to test back to the board to make sure everything is working correctly? I would hate to fix the board only to turn it back on and let out more smoke.

Thanks for any and all advice.
Justin

There's no mistaking Q53 has gone kablooey - it's melted and cracked. I also just found that Q54 is also gone - two of the legs are broken. Still working on finding the proper replacement.

Thanks for the tip on testing the coil. That will come in handy when I solder the replacement parts onto the board.

Thanks for all the good advice. I have managed to find a cross with Mouser but $42 for a transistor is ridiculous. I'm ordering the NiWUMPF replacement but I am still going to try and fix the problems with the original just to have it as a backup.

I plugged everything back in (with bad transistors de-soldered) but now notice none of the coils are firing. No time to test the power right now but I wonder if a wire is loose some where. The machine has all new fuse blocks and fuses that do test out correctly. I'll post an update when I have some time to test.

Again, thanks to all for the advice.