Lescell
Active member
Hey guys, figured I'd start a thread since I've spent lots of hours on this as a noob and not much luck at all.
I have a Robotron that I want to play so bad but it's got a few issues.. One, no video. Two, RAM error.
Lets start with the video..
First thing was to play with all the color/screen/hold pots on the neck and flyback. I can get colors and brightness to work but no game image. I've swapped out the chassis for a working chassis because of a whoops I had and get the same issue, colors and brightness, but no game image. The only thing I didn't try was swapping out the complete monitor, should I?
I'm not sure what would cause no video so this is where you guys come in. Let me know what else I can check, etc. I've rung out the purple video wires from the board to the monitor and all check out good for continuity, as far as the cable goes.
Next issue is a RAM error. I was getting RAM error 1-3-1, and noticed that chip 31 was literally missing. I pulled a 4116 from my Defender, put it in the empty spot and then got a different RAM error, I think it was 1-2-8 or something, but it seems like every time I power down the game and unplug something or swap a chip, I get a different RAM error. So, I had to order some things from Arcade Shop so I decided to order the 4164 chips and the adapter. They sold 4116 in bulk but were more than the 4164 so i decided i might as well upgrade. So I did and now get a 1-1-2 RAM error. I've cleaned a few other socketed chips with no luck.
I'm also getting only 4.79V which is on the low end but should still be ok? This is tested at the chips, but all the way back to the power supply, I get 4.92V or so. I've replaced all of the caps on the power supply expect the large one (not in stock at GPE) and the essential connectors.
So, with all of that said, what are some things I can look at to fix the no video and RAM error?
Thanks!
I have a Robotron that I want to play so bad but it's got a few issues.. One, no video. Two, RAM error.
Lets start with the video..
First thing was to play with all the color/screen/hold pots on the neck and flyback. I can get colors and brightness to work but no game image. I've swapped out the chassis for a working chassis because of a whoops I had and get the same issue, colors and brightness, but no game image. The only thing I didn't try was swapping out the complete monitor, should I?
I'm not sure what would cause no video so this is where you guys come in. Let me know what else I can check, etc. I've rung out the purple video wires from the board to the monitor and all check out good for continuity, as far as the cable goes.
Next issue is a RAM error. I was getting RAM error 1-3-1, and noticed that chip 31 was literally missing. I pulled a 4116 from my Defender, put it in the empty spot and then got a different RAM error, I think it was 1-2-8 or something, but it seems like every time I power down the game and unplug something or swap a chip, I get a different RAM error. So, I had to order some things from Arcade Shop so I decided to order the 4164 chips and the adapter. They sold 4116 in bulk but were more than the 4164 so i decided i might as well upgrade. So I did and now get a 1-1-2 RAM error. I've cleaned a few other socketed chips with no luck.
I'm also getting only 4.79V which is on the low end but should still be ok? This is tested at the chips, but all the way back to the power supply, I get 4.92V or so. I've replaced all of the caps on the power supply expect the large one (not in stock at GPE) and the essential connectors.
So, with all of that said, what are some things I can look at to fix the no video and RAM error?
Thanks!

