I am struggling to repair my G05 on my Asteroids game and would appreciate some advice. I just installed a cap kit and replaced the following additional components:
D607 & D708
Q605 & Q606
Q705 & Q706
I tested every other part (mostly in circuit) and they all seemed OK as far as I could tell. The sad part was that it worked for a while. I was feeling pretty good that I got it working after all of component testing and research. I played a few games and ran it for about 45 minutes without issue. I even had shut it on/off a few times during that period. On the last time, I opened the coin door to go into test mode. As expected, the interlock killed the power. So, I pulled it out the interlock and got into test mode just fine. I exited test mode and things continued to work. Then I shut the door. Upon doing so, the game restarted (as expected), but the monitor never came back on. I checked and found F600 was blown and the spot killer was on. Hoping it was a fluke, I replaced F600 and it immediately blew again. FYI: The game plays fine if I plug it into my V2000.
This is the symptom (F600 blowing) that caused me to recap and check for other components. So, I'm back to square one. Any suggestions on what to try next?
I read something in the B&W vector guide about testing the voltages from the frame to F600 and F700 without the yoke and XY inputs connected. It says it's supposed to be zero or less than 10 volts...if not Q706 may is shorted. I just replaced Q706. I'll pull the chassis (again) and see if Q706 is shorted. If so, what could be causing that? I don't want to give up, but after testing every component and having it actually work for a while, I'm pretty disheartened at the moment. I thought I'd be moving the game to my basement tomorrow. Now, it's still broken in the garage :-(.
Thanks, Chris.
D607 & D708
Q605 & Q606
Q705 & Q706
I tested every other part (mostly in circuit) and they all seemed OK as far as I could tell. The sad part was that it worked for a while. I was feeling pretty good that I got it working after all of component testing and research. I played a few games and ran it for about 45 minutes without issue. I even had shut it on/off a few times during that period. On the last time, I opened the coin door to go into test mode. As expected, the interlock killed the power. So, I pulled it out the interlock and got into test mode just fine. I exited test mode and things continued to work. Then I shut the door. Upon doing so, the game restarted (as expected), but the monitor never came back on. I checked and found F600 was blown and the spot killer was on. Hoping it was a fluke, I replaced F600 and it immediately blew again. FYI: The game plays fine if I plug it into my V2000.
This is the symptom (F600 blowing) that caused me to recap and check for other components. So, I'm back to square one. Any suggestions on what to try next?
I read something in the B&W vector guide about testing the voltages from the frame to F600 and F700 without the yoke and XY inputs connected. It says it's supposed to be zero or less than 10 volts...if not Q706 may is shorted. I just replaced Q706. I'll pull the chassis (again) and see if Q706 is shorted. If so, what could be causing that? I don't want to give up, but after testing every component and having it actually work for a while, I'm pretty disheartened at the moment. I thought I'd be moving the game to my basement tomorrow. Now, it's still broken in the garage :-(.
Thanks, Chris.
