Pac Man Troubleshooting Web Page Help

[phillymadison]

Hi I found this pac man trouble shooting web page here on the forums

http://www.arcadegameover.com/pactrouble.html

It looks real helpful but I need some help translating from what it says to what to do

For example for the problem that matches what I have it says "1E or 2E bad or removed"
So I guessing the chip in either of the two spots is bad and needs to be replaced
Thats pretty straight foward

but then it says "1E p15 short to p16" this is where I'm lost
How do I know which one is p15 and p16?
Once I know which is which how would I fix that?

Any help would be very appreciated Thanks

[Ken Layton]

1Ep15 would mean Chip located at position 1E on the circuit board and pin 15 of that chip.

[phillymadison]

Kool Thanks

Would I just count 15 pins from the top of the chip to the bottom left to right to find p15?

also would I have to change the entire chip when p15 has a short to p16?
Or is there a way to fix that

Thanks again

[Kevin Mullins]

This should give you the idea on the pinout.
http://www.tranzistoare.ro/datasheets/90/375443_DS.pdf

Pull the chip in question and do the same check on the board itself to make certain it isn't something else causing the short.

Check the chip itself while it is out of the board.

And yes..... you have to replace the chip if it is bad.

[phillymadison]

Thank you very much =)

the link helped a lot

but how can I tell if the chip has a short?

I have a volt meter, I just don't know what i should set it to and what im looking for.

Again thank you very much for all the help guys =)

[Kevin Mullins]

You should have a continuity setting, diode setting, you can even use a low ohm setting like 2K. (I don't reccommend the ohm method if you are unfamiliar with using it)
Basically if you touch your two leads together and get something like .000 or .001 then that represents being "shorted".  Infinite continuity.
If you have a digital with the beep, use that setting.
When it beeps.... it's shorted.
If you have an analog meter the needle will try to peg out.

Once you get the jist of that, probe the pins and spots on the board with one lead on each place mentioned.

I hope that makes sense.... I'm no electronics whiz by no means, especially for teaching.
Someone else here may have a better method of explaining it.

[phillymadison]

I have an analog meter and I'm understanding everything you said except for the term "peg out"
whats would that look like?

sorry for all the question but again Thank you very much for all the answers =)

[NightGod]

Peg out means it will jump all the way to the top of it's range (and hit the little stopper peg that sticks up there).

[Kevin Mullins]

He... yeah, gotta love the slang...sorry about that.
Touch your meters leads together and you'll see what it means.