Hopefully someone can help provide some insight on this on-going Ms. Pac issue:
I have a Ms. Pac machine that played blind when I got it (tube neck was busted). I got a working tube and put it in, and had the monitor chassis rebuilt.
I hooked up the game with the new monitor chassis and tube, and the board stopped working. I sent the board off and it needed repair, it has been repaired and tested and is supposedly working fine. Upon install of the board, I'm just getting a black screen. The monitor is getting 122V AC according to my DMM.
I checked the caps at C2 and C3 on the board while the game was powered up, and they are only reading 2.5V. Bungy was down over the weekend and looked at the machine with me, and said the edge connector looked fine, and he checked voltages at the connector and they appeared to be fine.
I have a switcher supply for the board, but when I hook it up it blows all 4 fuses on the right-side fuse holder (2 fuses are 1A, 2 are 5A). I replaced the fuse holder a few months ago and the problems mentioned above still persist. The switcher board will only go in one-way, so I'm certain I am not hooking it up backwards.
I'm not sure how else to troubleshoot the issues this machine is having, which surprises me because I thought Ms. Pac's were pretty simple in design and troubleshooting. My questions are:
1. could it be the power brick itself?
2. is there a way that I can wire up the switcher to bypass the power brick completely, just to see if that's the issue?
3. what other troubleshooting can I do?
4. will providing a pic of the power brick help anyone here in diagnosing?
I have a Ms. Pac machine that played blind when I got it (tube neck was busted). I got a working tube and put it in, and had the monitor chassis rebuilt.
I hooked up the game with the new monitor chassis and tube, and the board stopped working. I sent the board off and it needed repair, it has been repaired and tested and is supposedly working fine. Upon install of the board, I'm just getting a black screen. The monitor is getting 122V AC according to my DMM.
I checked the caps at C2 and C3 on the board while the game was powered up, and they are only reading 2.5V. Bungy was down over the weekend and looked at the machine with me, and said the edge connector looked fine, and he checked voltages at the connector and they appeared to be fine.
I have a switcher supply for the board, but when I hook it up it blows all 4 fuses on the right-side fuse holder (2 fuses are 1A, 2 are 5A). I replaced the fuse holder a few months ago and the problems mentioned above still persist. The switcher board will only go in one-way, so I'm certain I am not hooking it up backwards.
I'm not sure how else to troubleshoot the issues this machine is having, which surprises me because I thought Ms. Pac's were pretty simple in design and troubleshooting. My questions are:
1. could it be the power brick itself?
2. is there a way that I can wire up the switcher to bypass the power brick completely, just to see if that's the issue?
3. what other troubleshooting can I do?
4. will providing a pic of the power brick help anyone here in diagnosing?

