Hello,

All 4 buttons used to work fine. Then the button to enter the menu and the vol up button both stopped working. I have done the following (please note this is my first pinball and I am not very experienced)

even if I short the switch or wires directly it still does not work

All the below have made no different
- Rewired the original switch
- Replaced the switch
- using a multi-meter I checked the connectivity from the vol 5 wire to the socket. confirmed its OK. Did the same for the menu button and the 2 working buttons all the same. All good
- removed the board they connect to and checked the tracks from the pins from the buttons to their corresponding pins connected to the bigger wiring loom

I don't know where the bigger wiring loom goes and I was unable to trace the wires.

Any ideas where I might look ?

Also I think this is related, if I do a slam tilt with the coin door open the volume just keeps going up to MAX or until I turn the machine off. This is how I have to turn it up when needed.

Any suggestions would be helpful

Oh I also looked for Acid damage where the batteries are. whoever had it before me swapped the batteries with a coin type battery. I do not see any leakage or old damage

I will get some pictures in the morning. I used the multi meter to check if everything is earthed ok and it seems to be. None of hte coin lights are working either, but i put that down to rust. They never worked. Pics to follow in about 12 hours.

Thanks for the reply's

Which board had the damage and how did you repair it ?

Hello,

Thanks for the help. I have checked all the LEDs on all the board including LED1. They are all normal as detailed in the getaway manual. LED1 is on. I also checked the voltages look OK

I think it is time I call a pinball repair man. It really sucks not being able to access the Menus.

Thanks for all the helps guys

Testing this tonight. Sorry for my delay. I will keep you posted.

Perfect. Did you use a real paperclip or it a type of wire you can purchase ?

I did as you said.. and it looks like its the CPU. I checked the High Speed II WPC Schematics Revised May 17 1993 (see attachment), and I am not sure how to read Schematics, but mine looks to be wired different. Pin 5 and Pin 11 are not wired at all. Pin 10 had a black cable running to it, which I am guessing is ground.

If it is the CPU is there much I can do ? As I cant see any damage.. do I need to look into getting a replacement board ?

Hs2 (resized).png

I will remove the board tomorrow, but it looks good to me.. I will investigate more and confirm

Thanks for the tips. I just purchased a Elenco LP900/625 Logic Probe. Started to watch a few youtube videos on how to use one. I did not know what these things were or did until yesterday, so it will be an interesting experiment using this to help confirm the issue

progress - I have found some resistors that are not working. I will replace them.. I am now building a desk powersupply. Just waiting on the plug.

I got this working. It was the LM339 chip on U16. It was replaced and then started to work.

Thanks for all the help guys