I just picked up a nonworking Asteroids game and would like some help to see it I can get it going. I seem to have all of my voltages and when you turn the game on the player1 and 2 buttons flash but nothing else. You can not coin the game up and it you hit the test switch you get one low tone and then a deeper one. The monitor only has one small dot in the bottom right corner. I switched big blue with one out of a parts Pole Position PS and the game acts the same when turned on. I know the replacement big blue was just as old but I was hoping for a different result to tell me that was the problem. When you power the game on the LED on the main board comes on and stays on. The LED on the deflection board starts off dim and works its way up then stays lit.
Are the tones telling me that in need a new ROM at E2 and where is the best place to get them? Is this how my monitor should act if the game board is not working correctly? I have a logic probe and a DMM as well as an oscilloscope (not quite sure how to use it yet). I can solder and have no trouble replacing parts...it is just finding the bad part on these game boards that always has me lost. Where should I look or test next?
Thanks for any help you can give.
Scott
Are the tones telling me that in need a new ROM at E2 and where is the best place to get them? Is this how my monitor should act if the game board is not working correctly? I have a logic probe and a DMM as well as an oscilloscope (not quite sure how to use it yet). I can solder and have no trouble replacing parts...it is just finding the bad part on these game boards that always has me lost. Where should I look or test next?
Thanks for any help you can give.
Scott