Terminator 2 - Testing power supply? (Noob questions)

BullWeivel

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Terminator 2 - Testing power supply? (Noob questions)

I have a Termnator 2 which wont boot up. So I am thinking first thing lets check out the power supply.

Symptom: contstantly reboots. Even gets to some type of check screen than reboots. Garbage constantly comes onto the screen as well.

Getting out my multimeter I am wondering if I am doing this correctly.

First off the multimeter should be DC, so I set it to that. See the picture of how I have the multimeter setup (ignore the reading though as I had nothing connected) Which I think I have that part correct, and the cables plugged in correctly.

Now here is where I dont get it. In my head I am thinking I need a - and + to check the voltage coming out the device. I checked the AC from the wall and see 122ish, and that made sense because the only inputs were side by side, but the DC ones are all over the place.

See the picture but it appears to me that going from the AC inputs you have:
(+12V) (EmptyPin) (-5V) (Two pins-+12V) (5 pins ground) (Two pins +5V)

Okay in my brain I am expecting a - and a + somewhere like you would see in a car battery, but that isnt true here. So am I to assume that where I stated Two pins, one is + and one - ?
From what I could tell the Two pins +5V were showing about 4.98V DC, but the two 12V pins were not showing that and fluxuated. Now keep in mind I am not sure I setup the multimeter correct.

What are the pins which are on their own with +12V and -5V for? From what I can tell though neither are used.

Now look at the power supply with the connector hooked up. Why is the connector longer than the power supply? One pin which has a wire in it, doesnt even connect. Surely that is not correct?

So I am wondering what I am doing wrong here. Obviously I am a newbie and I expected to see + and - signs and be able to just easily grab voltages, but this is not showing what I thought it would and the marking I expected to see are not present.

Just want to make sure the power supply is correct before I move onto the next task of breaking down the board and figuring out whats wrong there.
 

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I just replaced the power supply on my t2 machine as well. Judging from the taito ps in a midway cabinet, and the pin hanging out in the open air there, you may just want to pick up a new supply anyway. If you decide to go that route, I can upload pictures of how my supply is wired in.
 
Please do post your picture of how your using the power supply.

Have another one sitting by I can use. Would be great for reference even though I think I found the wiring diagram.
 
you want this: http://na.suzohapp.com/powersupplies/80006400.htm

you will also probably want to pull out the main board and give the JAMMA edge connector a cleaning too. household pencil eraser should do. make sure the little rubber fragments get pushed off the board, don't leave them on there. :) the smaller portion of the JAMMA edge is where all the power connectivity is, I would particularly focus in that area.

if you want a how-to on how to rig up the new power supply just ask me. get the little fork terminals and crimp them on your wires. make your life easier.
 
Has a friend come over an school me on the issues this game was having.

Here is where my brain was confused:
See the picture but it appears to me that going from the AC inputs you have:
(+12V) (EmptyPin) (-5V) (Two pins-+12V) (5 pins ground) (Two pins +5V)


Okay, well I was thinking where you see two pins +12V if you put the neg/pos there it would show 12V on the multimeter. Did not occur to me that two pins are BOTH + and the - should be coming from the part where it says (5 pins ground).

In the end he pushed on the rom chips, turned on the game, and done.

Hrmm... now to decide what to clean up next in regards to the board in this beast. Thinking of pulling the entire board, and all the chips, and cleaning them up.

Maybe even running the boards through the dishwasher like I keep hearing about.
 
In the end he pushed on the rom chips, turned on the game, and done.

Hrmm... now to decide what to clean up next in regards to the board in this beast. Thinking of pulling the entire board, and all the chips, and cleaning them up.

Maybe even running the boards through the dishwasher like I keep hearing about.

glad to hear you got it up and running, this is pretty typical for midway boards (chip creep/oxidation). Personally i think your on the right track I might not go and wash the board unless it's really filthy. Instead of washing it tho i'd just pull the chips and clean the legs with some fine grit paper, then clean the edge connector on the board with a pencil eraser (watching the shavings ofcourse).

That alone should stop any further issues until that taito power supply goes out (is that even original???)
 
Looking at your photo, you had one of your test leads in the wrong place in the meter.

The postive was in the correct hole.

The other lead typically goes in the COM jack, unless you are measuring amps (which is why the jack on the left side is labeled AMPS). The left side jack is for higher load readings, and has a maximum use time listed on the legend.

This could explain why you were seeing some wild readings.

When you check a power supply, you check the DC voltage on the DC setting, and then remove the test leads, swap to AC, and test the DC power supply for AC ripple. It should generally be fairly low (less than 0.02 millivolts) but it can vary on the power supply.
 
Re: board cleanup.

Before you go with the dishwasher route, post a picture of the board. You need to give it a good look, to make sure nothing is on the board that will be damaged by exposure to water first, or you could turn your working board into a dead one.

One of the first things I learned as an Arcade tech is "If it isn't broke, don't mess with it. Don't worry, it will break soon enough, and you'll have time to mess with it then."

If you are really hot to get into repairs, go find a game that is a basket case, and bring it back to life. That way, you can work on a nobel effort, and gain some experience.

Better yet, take a night job at an arcade, and learn there if you can find one. They don't pay well, but it's a good place to get your arms into a bunch of games in a short period of time, and see what is inside and what fails.
 
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