Monstermug
Active member
- Joined
- Mar 21, 2011
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I got a Asteroids pcb that has a slight glitch. It was working one minute, switched off. Turned on again and this happened.
Firstly, large saucers are showing up as small saucers. There are also no medium size meteors either. Only Large and Small. When a large meteor is blown up it turns into a small meteor and when the small meteor is blown up it then split into 3 other small meteor. Points are still awarded the same as if working.
Also, which seems to be related, some of the text shown is not centred. (The high score table, High score congratulation message, press start, insert coin). The main score and Atari logo inc is centred though. The texts looks smaller than what they should be and shifted left of the screen.
Things I have done so far:
Replaced all 3 program roms and 1 vector rom. No change.
Replaced aging Rom sockets. No change.
Checked capacitors.
I have all correct sounds, and everything else function correctly.
No errors in test mode.
No visual damage on board. No missing components. No dry solder joints. (I went through this pcb with a fine tooth comb) (PCB looks brand new and untouched)
If you could point me to which part of the schematics this might be related too? I was thinking a slight glitch in the addressing circuit? However probing the entire circuit against skats, revealed nothing interesting. (I could have missed something out though)
If you have read this far then thank you!
Firstly, large saucers are showing up as small saucers. There are also no medium size meteors either. Only Large and Small. When a large meteor is blown up it turns into a small meteor and when the small meteor is blown up it then split into 3 other small meteor. Points are still awarded the same as if working.
Also, which seems to be related, some of the text shown is not centred. (The high score table, High score congratulation message, press start, insert coin). The main score and Atari logo inc is centred though. The texts looks smaller than what they should be and shifted left of the screen.
Things I have done so far:
Replaced all 3 program roms and 1 vector rom. No change.
Replaced aging Rom sockets. No change.
Checked capacitors.
I have all correct sounds, and everything else function correctly.
No errors in test mode.
No visual damage on board. No missing components. No dry solder joints. (I went through this pcb with a fine tooth comb) (PCB looks brand new and untouched)
If you could point me to which part of the schematics this might be related too? I was thinking a slight glitch in the addressing circuit? However probing the entire circuit against skats, revealed nothing interesting. (I could have missed something out though)
If you have read this far then thank you!
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