joetechbob
Member
Asteroids Playing Blind--DC Voltage Only from X/Y Outputs
So, I'm kicking myself right now. I had repaired my cocktail Asteroid's game board and had it working great. However, last night I was tinkering with my A/R board and after having pulled the A/R board, closed the side door to my cabinet--thus closing the interlock switch. This caused the game to turn on without an A/R board installed, and run this way until about an hour ago (roughly 24 hours).
Much to my dismay tonight, I found that when firing the game back up with an A/R board installed the game only plays blind. Luckily, after swapping in my other working Asteroids board I found that the monitor appears to be ok. However, after taking the cocktail game board and installing it into my upright I found that it was basically just drawing a spot at roughly half-way between the center of the screen and the upper right corner (not sure why spot killer isn't kicking in).
I put the board back in the cocktail and measured roughly 0 VAC and 13-14VDC on the X & Y outputs. The good news is that the game does play blind.
I haven't really had to get deep into the vector generation circuitry on Asteroids on the first couple of board repairs I've done, but I suspect that the issue is related to a component(s) that receives unregulated power via 36 VAC (seeing as the A/R board wasn't present).
Anyone have any good tips for debugging this?
So, I'm kicking myself right now. I had repaired my cocktail Asteroid's game board and had it working great. However, last night I was tinkering with my A/R board and after having pulled the A/R board, closed the side door to my cabinet--thus closing the interlock switch. This caused the game to turn on without an A/R board installed, and run this way until about an hour ago (roughly 24 hours).
Much to my dismay tonight, I found that when firing the game back up with an A/R board installed the game only plays blind. Luckily, after swapping in my other working Asteroids board I found that the monitor appears to be ok. However, after taking the cocktail game board and installing it into my upright I found that it was basically just drawing a spot at roughly half-way between the center of the screen and the upper right corner (not sure why spot killer isn't kicking in).
I put the board back in the cocktail and measured roughly 0 VAC and 13-14VDC on the X & Y outputs. The good news is that the game does play blind.
I haven't really had to get deep into the vector generation circuitry on Asteroids on the first couple of board repairs I've done, but I suspect that the issue is related to a component(s) that receives unregulated power via 36 VAC (seeing as the A/R board wasn't present).
Anyone have any good tips for debugging this?