Southern Indiana Ms Pacman needs help

[kstillin]

It doesn't sound like he has read this post clearly, so I'll bump it up.

Do exactly as is written below. Stick one probe in one side of the monitor plug and stick the other probe in the other side. At the same time. Measure for AC voltage.

Treat the monitor's power plug like an outlet when testing. Stick one probe in one side and the other probe in the other. I'm willing to bet that the monitor is ok if you have no sound also. Did you try putting a quarter in and hitting start to see if there is sound. If they set it to free play there will be no sound until in the game.

Show us some pics of your power supply.

 

[Jarvis]

Ok, from the book it looks like this lug should have 115 volts.... brown wire with orange. Mine doesn't... so is the transformer bad?

Ok, i checked it like you said. If you check it like a plug yes it has 115 volts. Coin stuff doesn't do anything.
Question is on the brown/orange wire where i have pointer going to above... the book says 115 volts so why do i have 60?
Why does the fuses on the left that should have 115 volts, 1 has 115 and 1 has 60?

When i got the machine 1 of the 4 fuses were missing and another blown. Not sure if it was 5 or 12 volts that were blown.

The screen just shows what looks like white dots.

I am to the point i think the main PCB board is bad and i might have a bad transformer. I would like to keep the game as original as i can but if i have to buy a power supply box i will. Any good place to get the PCB boards repaired?

 

[ELutz]

Ok, i checked it like you said. If you check it like a plug yes it has 115 volts. Coin stuff doesn't do anything.
Question is on the brown/orange wire where i have pointer going to above... the book says 115 volts so why do i have 60?
Why does the fuses on the left that should have 115 volts, 1 has 115 and 1 has 60?

When i got the machine 1 of the 4 fuses were missing and another blown. Not sure if it was 5 or 12 volts that were blown.

The screen just shows what looks like white dots.

I am to the point i think the main PCB board is bad and i might have a bad transformer. I would like to keep the game as original as i can but if i have to buy a power supply box i will. Any good place to get the PCB boards repaired?

Your transformer sounds good, but you very well could have motherboard issues.

Regarding your voltages....these are AC voltages. You're trying to measure them like they're DC voltages....two very different beasts.

OK, the one fuse that reads 115V is probably your input voltage...the line voltage...basically voltage straight from your wall outlet. On your wall outlet...one side is "hot", the other side is "neutral", and the lower third prong is "earth" ground. Earth ground and Neutral are connected together at your home's breaker box. So, earth ground and neutral are the same.....reading hot from neutral or earth ground will both yield 115V.

Your fuse that reads 115V is the same point as the hot from your wall outlet....and you're reading it from earth ground (I assume). Somewhere in your cabinet is this 115V corresponding "neutral". If you want, follow your line cord...you'll find it.

The 115V fuse that reads 60V is the monitor's input voltage. This voltage has gone through an isolation transformer....thus, "isolating" it from the primary 115V. You are reading this voltage (also) from earth ground....but this voltage has been "isolated"....so, you're only reading half the wave. Half of 115V is approximately 60V. To read the full wave (re:115V), you need to find the other half. The other half is that top wire beside the wire you keep arrowing to. Put one lead on the arrowed wire...put your other lead on the wire beside it. With your meter set to AC volts...you probably get around 120V....or 60V + 60V. Remember, this is AC not DC.

Edward

 

[Jarvis]

Edward, I am following you. I just thought from the print this wire has 115 volts.

Where is a good place to get the motherboard repaired or exchanged?

 

[Jarvis]

Well i think my power supply is ok but may have a bad motherboard. I ordered a power supply kit from arcadeshop.com and he said if my power on the motherboard is bad this will fix it which happens ofter. I understand the new power supply kit is more stable? Talk with a guy that said he puts them in all his machines. When it comes and if it doesn't fix it than i will need to get the mother board repaired.

 

[Jarvis]

Ok, I ordered a power supply from arcadeshop.com and put it in tonight and nothing. Guy told me this is something he puts in his machines even if they work. So i took the main board out tonight and seen some what looked like bad contacts on the far left side of the plug, grounds maybe? So i pluged it back in but didn't push it down all the way and it worked. Now it works and looks good but the screen has a little "wave" to it? Looks like it's in the lake waving around... any ideas there?

 

[Jarvis]

another question is... my main board has another board pluged in the top of it then the main connector pluged in it. Seeing pics i don't see anything else with this board.

 

[Riptor]

another question is... my main board has another board pluged in the top of it then the main connector pluged in it. Seeing pics i don't see anything else with this board.

Sounds like the ground pins of the edge connectors are toast. It is repairable, thats not a problem. This is most likely whats causing the waviness on the screen as well.

The small board between the harness and the pcb is a filter board. Take it out and throw it in the trash, its not needed and causes problems. Simply removing this might take care of your waviness but that edge connector needs to be repaired, its only going to get worse.

Im against putting a switcher in pacs, the original power supplys are pretty bulletproof once the fuse holders are replaced. It cost alot less to repair the existing power supply than it does to install a new switcher.

 

[channelmanic]

You can use copper trace tape to repair the board edge connector.

I documented it in my repair logs here:
http://newlifegames.net/nlg/index.php?topic=61.msg13852#msg13852

I'd recommend repairing the connector then replacing the socket on the wiring harness as it will be damaged too.