Why my PAC-MAN credits up to 99 ???

[BUCKETHEAD]

My PAC-MAN cabinet recently started giving me 99 credits with one Quarter.

And it is not set on FREE PLAY.

The real annoying thing about this is.  It credits one number at a time

until it reaches 99.

It has all the original wiring in it.

Any guess what my problem may be?

Thanks!

[RayB]

Ghosts.

Sell it on Ebay. You'll make a killing.
Don't forget to write a 2-pager explaining how your grandpa used to play the machine and then he died in the same room.

[Q*Bert_OP]

Wires crossing? Bad coin switch?

[brophog]

That's my guess is a faulty coin mechanism.

[BUCKETHEAD]

Both coin switches on each side have the same effect ( 1 - 99 )

But i can press the RED credit button, On the inside right of the coin door

and it will add one credits like normal.

This is what confuses me

[DarkKobold]

Is it clicking on the coin counter as well? It might be a TTL chip stuck at high, or something, since the test credit is a seperate input, I believe.

[tbombaci]

From Usenet:

>>If I had to guess given your symptoms I'd say 8E should be replaced.
>>This chip inputs both the Rack Advance and the Coin 1 lines.
>>
>>Given that you said the inputs are high I believe that the RM8 resistor
>>network is probably good.
>>
>>Kev

The whole post:
http://tinyurl.com/bovtf

-Tom

[BUCKETHEAD]

I will check the COIN COUNTER tomorrow.

What exactly is a  TTL chip ??

If it does happen to be

[Thenasty]

if you think the COIn COUNTER is shorted, just disconnect it and try again. This will illimate your Coin Counter issue and you can now check the COIn SWITCHES. The best thing really to do is just disconnect the wires from the COIN SWITCH and test it that way without using the coin switch or counter. Just simply rub the 2 wires together and see if still gives you 99 credits. Hope that made sense. If it still gives you 99 credits, then its somehwere in your PCB (TTL Chips).

[BUCKETHEAD]

Disconnected the Coin Counter today.

Same result  99  Credits   

Even replaced it with another newer Coin Counter i had lying around.

It didn't even work.

Didn't try the rubbing of the two wires together.

I will try that this week sometime.


I did disconnect the wires from the chip on the right side of the cabinet.

The side opposite of the PCB.

I believe that chip is a COIN advance pcb?

Maybe im wrong?

But it will not coin up at all with that unplugged.

But still will from the RED credit button.

[quarterback]

Are the coin switches hooked up as NO or NC?

[BUCKETHEAD]

NO  or  NC ?

Sorry my friend!

You have lost me there!

I haven't been in this long.

What exactly does that mean?

And i can answer your question.


Thanks!

[SirPoonga]

Normally Open, Normally Closed.  The lugs on the microswitched are labelled that.

[BUCKETHEAD]

Gee,  I keep on learning all kinds of

useful info here! 

I will check tomorrow.

It is out in my garage.

And im in for the night.

Thanks!

BUCKET ...

[quarterback]

Gee,  I keep on learning all kinds of

useful info here! 

I will check tomorrow.

If a switch is "NO" (normally open) then it will only "close" when a button is pressed (or, in this case, when a coin goes through)

If a switch is "NC" (normally closed) then it will "open" when a button is pressed.   

You want your switches to be hooked up as "Normally Open", so they're only activated when a coin goes through.   If they're hooked up "NC" then they're constantly 'telling' your PCB/computer/whatever that a connection has been made, as if a coin were falling through an "NO" switch.

It seems like this could be the source of your problems.

Some coin mech wiring pictures are on this page for more info: http://www.retroblast.com/articles/token-convert2.html

[BUCKETHEAD]

Thanks for all the help,

In trying to help me solve this problem.

I could never find out the cause,  It has OLD SCHOOL coin switches in it.

Which made it hard to figure out the NO / NC

So i finally had enough     And wired the Coin switches to the CREDIT BUTTON

on the inside of the Coin Door.


That made everything work PERFECT!   

Just the way i liked it.  Before it screwed up!


One day i wanna yank out the Original wiring harness

and replace it with a JAMMA harness and a JAMMA to PAC adaptor.


Again thanks for all the help!

[Thenasty]

So i finally had enough

[BUCKETHEAD]

Nope the COIN SWITCHES are working fine! 

I get 1 CREDIT for 1 QUARTER.

I was getting  99 CREDITS for 1 QUARTER.

I wired the COIN SWITCHES to the CREDIT BUTTON wire.

Now, there could have been a short or a break somewhere in the

Coin Switch wires before i cut them from the switches.

I really didn't want to trace the break or short all the way through the cabinet.

And so i thought of this easy fix, For my problem.

But like i said,  This is the way i like it to Coin up.


So i'm gonna leave it this way.

Until i Jamma it one day.


I really to appreciate everyone's input on this problem.