First off I want to mention that I am new to this, but have some electronics background. I picked up a Ms. Pacman Cocktail and 4 other machines for about what it cost to feed my dog for a month, but they all have serious problems.
I have attached some pictures of what Ms. Pacman is doing. I have read several forums and posts about common Ms. Pacman problems and have decided, I need some help. Here's what I have checked and replaced.
The 6 MHz bus at chips 2A - 2D is running at 6.137MHZ. I did replace 2B. All outputs from the previous mentioned seem to be running fine and riding on the 6 MHZ line.
After connecting the monitor to Golden Tee 3d and recieving similar symptoms I have decide this is a montior problem and not a board problem, although the board does still have some issues. (I am all ears if there are some other thoughts.) There is a sigifinicant humm out of the speaker and a high pitch squeal out of the monitor. (Per the pics, I am running this as Pacman for troubleshooting purposes.) All sounds work, and the coin mechs initiate a credit. I can play the game, just cant tell what is going on.
This appears to be a WG 4900 series monitor, but the Ms. Pacman book I have shows a 4600 series. I did install a 4900 cap kit from Bob Roberts and it did seem to help broaden some of the adjustments on the back of the monitor chasis. I am all ears and will post what ever pics needed to point me in the right direction. That is to say pictures of the game, not anything that I will regret in 10 years or so.
thanks,
MC
I have attached some pictures of what Ms. Pacman is doing. I have read several forums and posts about common Ms. Pacman problems and have decided, I need some help. Here's what I have checked and replaced.
The 6 MHz bus at chips 2A - 2D is running at 6.137MHZ. I did replace 2B. All outputs from the previous mentioned seem to be running fine and riding on the 6 MHZ line.
After connecting the monitor to Golden Tee 3d and recieving similar symptoms I have decide this is a montior problem and not a board problem, although the board does still have some issues. (I am all ears if there are some other thoughts.) There is a sigifinicant humm out of the speaker and a high pitch squeal out of the monitor. (Per the pics, I am running this as Pacman for troubleshooting purposes.) All sounds work, and the coin mechs initiate a credit. I can play the game, just cant tell what is going on.
This appears to be a WG 4900 series monitor, but the Ms. Pacman book I have shows a 4600 series. I did install a 4900 cap kit from Bob Roberts and it did seem to help broaden some of the adjustments on the back of the monitor chasis. I am all ears and will post what ever pics needed to point me in the right direction. That is to say pictures of the game, not anything that I will regret in 10 years or so.
thanks,
MC
