crazykong72
New member
Hi,
I'm new to these forums, but am hoping somebody can help me.
I'm over in the UK and have a cocktail Ms Pacman with what looks like a geniune Midway unmodded PCB. Problem is the machine has run fine for years, but since moving it, the following has happened.
The graphics are corrupt, more specifically the score line is show in reverse vertically left of middle. The maze also wobbles and looks corrupted, kinda transposed 2 or 3 times in the wrong postion. It is very similar to this fault on Pacman here. The main difference is that the screen is a bit more garbled and sometimes fixes itself and then goes wrong again...
http://www.mikesarcade.com/arcade/images/pacpix/pacprob-squares.jpg
I've ruled out the monitor being at fault, as the boot up is displayed fine until the cross hair grid appears.
I've taken a look at the board in situ, and it seems to be an untouched Midway board, with MsPac daughter board, the VRAM 284 card, and the Sync Buss 285 card.
First point of call was to remove both the 284 and 285 card, brush with toothbrush, and reseat them. This did not appear to have any effect.
Next tried looking for chip A8, as suggested at Mikes Arcade, it is at the far right from the P1 control panel. Looked at the feet of this, and they dont seem corroded. Gently touched it to see if it was a contact problem, nothing.
Next I removed the edge connector off the PCB loom to see if was a problem here. Again nothing.
After pulling the board out of the machine and visually inspecting it, giving it a slight clean and refitting it, the problem is still there.
The only thing I have spotted is that around the A8 area, some of the green board layer has come away. I will take a close up photo of this later and show it.
Currently I've attached some pics of the problem, and upload a vid a youtube here:
http://www.youtube.com/watch?v=Zu7x3cjsnc0
I'm a newbie with no prior board repair experience, dont have a logic probe, but can use mulitmeter and solder.
Any thoughts or help would be most welcome.
Thanks.
I'm new to these forums, but am hoping somebody can help me.
I'm over in the UK and have a cocktail Ms Pacman with what looks like a geniune Midway unmodded PCB. Problem is the machine has run fine for years, but since moving it, the following has happened.
The graphics are corrupt, more specifically the score line is show in reverse vertically left of middle. The maze also wobbles and looks corrupted, kinda transposed 2 or 3 times in the wrong postion. It is very similar to this fault on Pacman here. The main difference is that the screen is a bit more garbled and sometimes fixes itself and then goes wrong again...
http://www.mikesarcade.com/arcade/images/pacpix/pacprob-squares.jpg
I've ruled out the monitor being at fault, as the boot up is displayed fine until the cross hair grid appears.
I've taken a look at the board in situ, and it seems to be an untouched Midway board, with MsPac daughter board, the VRAM 284 card, and the Sync Buss 285 card.
First point of call was to remove both the 284 and 285 card, brush with toothbrush, and reseat them. This did not appear to have any effect.
Next tried looking for chip A8, as suggested at Mikes Arcade, it is at the far right from the P1 control panel. Looked at the feet of this, and they dont seem corroded. Gently touched it to see if it was a contact problem, nothing.
Next I removed the edge connector off the PCB loom to see if was a problem here. Again nothing.
After pulling the board out of the machine and visually inspecting it, giving it a slight clean and refitting it, the problem is still there.
The only thing I have spotted is that around the A8 area, some of the green board layer has come away. I will take a close up photo of this later and show it.
Currently I've attached some pics of the problem, and upload a vid a youtube here:
http://www.youtube.com/watch?v=Zu7x3cjsnc0
I'm a newbie with no prior board repair experience, dont have a logic probe, but can use mulitmeter and solder.
Any thoughts or help would be most welcome.
Thanks.
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