I suppose you could always bend the metal flap on the coin door that pushes the switch closed, a little more.

LTG : )

Or tighten the screws.

No screws, it's welded on Shadow.

LTG : )

Forget the high power, it's working. Different switch.

Work on the memory protect. Wires on it tight ? If you push it in, does the message go away ? If so, it wants to be pushed in more.

LTG : )

Hey Jazzmaster, I had a similar problem with my No Fear which is close to TS (both made in 1995)
I ended up blowing a transistor (u20) on the CPU board. Luckily Williams had it socketed in so I just pulled it out and put in the new chip, fixed.

The pic below was what my dmd was saying:
Hope this helps!
image.jpg

The same symptoms were happening to me, drove me crazy!!

Sounds like you are having the same problems. If its the same socketed chip (u20) on the CPU board it's an easy fix.

@Castro28, thanks for the advice. Pulled the transistor out of a working machine and popped it in my machine which had this coin door open when it was not open, and it fixed that problem and another problem i was trying to figure out with a row of switches which were not working.

Thanks again for the post and knowledge, really helped me out.

U20 on a WPC is a 2803 column drive for the matrix. If that was bad; you would have had other switches on the column acting up too.

It's not a transistor, it's actually 8 darlingtons. I also have *never* seen one with a socketed U20; someone has changed that along the way. U20 was always getting popped.

It wouldn't be ground. One of the switches is connected to the switch matrix; used to detect if the door is closed. The other just has one side of the solenoid secondary going through it. If the switch that detects the door being closed failed; machine thinks it's open but the solenoids continue to work; the CPU/driver doesn't control the voltage; the interlock physically disconnects the AC before it gets to the driver board.

At least that's how I remember all the WPC machines I had my head in worked.

I had this exact problem on my JM, and it was a corroded connector. The battery box on WPC-S is mounted above the cabinet switches harness connector, and some previous owner had let the batteries leak on to it. That made the memory protect switch start reporting intermittently.

I did a write-up on it here:
http://quinndunki.com/blondihacks/?p=1737

Thanks Blondie, I had the exact same problem with the coin door. Repinned it and fixed the problem