mike86325
New member
I just purchased a Ms. Pac-Man upright as my first cabinet, but I have had zero luck getting it to work. I have no signs of life - no sound, video, door lights. Marquee lights up and the monitor does sound like it powers on as well.
I'm completely new to this, but here is what I've done so far:
1) First, I replaced all of the fuses with brand new ones and turned it on. Coin door lights flicked on for a second before going off. Other than that, no other progress. I turned it off and noticed both of the new 1A fuses blew.
2) Disconnected everything, replaced the 1A fuses, and reconnected things one by one until the fuses blew again. Doing this singled out that the fuses were blowing when the board was connected. Also of note, the edge connector appears to be a bit burnt (see pic). I'm not sure if this would lead to the game being completely "dead" or not, but it's the only thing I can easily pick out with my limited knowledge.
3) Checked voltages of the transformer:
120V input: 124.7V
7VAC: 7.59V
7VAC: 7.58V
Combined: 15.21V
12VAC: 12.89V
12VAC: 12.89V
Combined: 25.80V
4) I then measured the voltage at pin 18, C2 and C3 caps, and all of the 7V pins:
7V pins all looked good: ~7.5 on each
pin 18: 2.216 VDC
C2: 2.195 VDC
C3: 2.208 VDC
I know the board has worked in the last few years since I have played it before. This cabinet was owned by my in-laws friend who recently passed. He had it in his house and under his possession since 1993 so it shouldn't be a total hack job situation.
Hoping I can diagnose (and possibly fix!) the issue on my own. If it seems outside my skill, I'll probably hand it over to a pro, but I'm treating this as an opportunity to learn as much as I can about the cabinet. Thanks to this site, I've been able to do a lot of reading this weekend!
I'm completely new to this, but here is what I've done so far:
1) First, I replaced all of the fuses with brand new ones and turned it on. Coin door lights flicked on for a second before going off. Other than that, no other progress. I turned it off and noticed both of the new 1A fuses blew.
2) Disconnected everything, replaced the 1A fuses, and reconnected things one by one until the fuses blew again. Doing this singled out that the fuses were blowing when the board was connected. Also of note, the edge connector appears to be a bit burnt (see pic). I'm not sure if this would lead to the game being completely "dead" or not, but it's the only thing I can easily pick out with my limited knowledge.
3) Checked voltages of the transformer:
120V input: 124.7V
7VAC: 7.59V
7VAC: 7.58V
Combined: 15.21V
12VAC: 12.89V
12VAC: 12.89V
Combined: 25.80V
4) I then measured the voltage at pin 18, C2 and C3 caps, and all of the 7V pins:
7V pins all looked good: ~7.5 on each
pin 18: 2.216 VDC
C2: 2.195 VDC
C3: 2.208 VDC
I know the board has worked in the last few years since I have played it before. This cabinet was owned by my in-laws friend who recently passed. He had it in his house and under his possession since 1993 so it shouldn't be a total hack job situation.
Hoping I can diagnose (and possibly fix!) the issue on my own. If it seems outside my skill, I'll probably hand it over to a pro, but I'm treating this as an opportunity to learn as much as I can about the cabinet. Thanks to this site, I've been able to do a lot of reading this weekend!
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