Williams Black Knight 2000 (Williams, 1989) Reset Problem

[peter cull]

problem when playing the game it will all of a sudden reset the game ,any help with this would be grateful thanks...also notice it not holding the memory would that be the cpu roms?and when i turn the marchine on it says ajustment failure .pulled the cpu roms and reseated them, it stopped the[.. reset] the memory gone back to old score memory on the marchine when i first got it .

 

[pinballdaveh]

Resetting of a machine is often a 5 volt problem. Recapping of the power supply often helps a reset problem. Reseating of cpu roms will often loose their stored info and go back to factory settings. Batteries and holder should be checked if haven’t been done yet.

 

[peter cull]

i have anew power supply board got it last year ,and what do you mean 5 volt problem

 

[pinballdaveh]

A 5 volt problem is when the power supply doesn’t put out the correct voltage. About 4.9 to 5.25 is a good range. I checked the online site flipperwinkel, they suggest you test or change the flipper diodes. If the diodes are bad or not soldered properly the surge will be felt in the cpu board, causing resets. They say that other coil diodes being bad could cause problems also. Check out the site for more info.