Teenage Mutant Ninja Turtles pcb won't accept coin1

smalltownguy2

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Teenage Mutant Ninja Turtles pcb won't accept coin1

I picked up a 4 player TMNT board in a trade deal, and the player 1 coin input does nothing. I tested the cabinet wiring with a Simpsons board and it's fine. I moved the TMNT board to another jamma cab and P2 coins up fine, but P1 will not coin up.

I pulled the pcb and followed the coin1 trace all the way from the edge connector to the first through hole component, which I believe to be a resistor array? I can't tell since it's one of those black coated chips. I think they call those a resistor array. Anyway, I have continuity all the way from the edge finger to the leg on that chip.

What should be looking at next?

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http://gamesdbase.com/Media/SYSTEM/...nage_Mutant_Ninja_Turtles_-_1989_-_Konami.pdf

Page 17- Looks like there is a 005273 IC that is used for P1 coin. I would check that next.

Thanks, that's the chip that I circled above. Since P1, P2, and P3 left movement is also affected by that chip, I'm inclined to say that this chip is not the problem, since the other players' movements are not affected. P2 and P3 can both move left no problem. I guess there's a slight possibility that a chip leg is broken above the board hole somewhere going into the chip, but that's a pretty low probability.

Can these chips be sourced?

EDIT: found a source for them. They are indeed resistor arrays, or more properly called "resistor capacitor input array."

http://www.andysarcade.net/store/index.php?act=viewProd&productId=583
 
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Thanks, that's the chip that I circled above. Since P1, P2, and P3 left movement is also affected by that chip, I'm inclined to say that this chip is not the problem, since the other players' movements are not affected. P2 and P3 can both move left no problem. I guess there's a slight possibility that a chip leg is broken above the board hole somewhere going into the chip, but that's a pretty low probability.

Can these chips be sourced?

EDIT: found a source for them. They are indeed resistor arrays, or more properly called "resistor capacitor input array."

http://www.andysarcade.net/store/index.php?act=viewProd&productId=583

Ahh...I didnt realize that chip was the one you had circled. I figured it would look like an IC. Other than swapping it for one that is working, or busting out a logic probe, I am out of ideas :(
 
Ahh...I didnt realize that chip was the one you had circled. I figured it would look like an IC. Other than swapping it for one that is working, or busting out a logic probe, I am out of ideas :(

It's OK...the more I think about it, the more ideas I get. It's entirely possible that part of that resistor array could be malfunctioning and part of it is working OK. I think what I'll do is swap it for another one next to it that controls player 2 start and the right controls - location A21. If my problem follows the resistor pack, then we've isolated the issue.

It's problems like this that make me very happy to own my Hakko 808 desoldering gun. I should be able to remove these two ICs and swap them no problem. Before I bought that tool, the thought of desoldering and resoldering 20 legs of IC's really freaked me out. Now I'm like, "whatever...it'll take 10 seconds" LOL
 
Same here. I don't know how I ever got along without the 808. Good luck. Let us know if that fixes it.
 
I have a bunch in the bins here if you don't want to pay international shipping.
 
Follow the traces. They have to go from the edge connector to the SIP device to a chip.
 
I'll start walking through traces. Right now, here's what I know:

P1 coin does not work
P2 right does not work

I believe everything else P2-P4 works. I cannot test any other P1 movements, since I cannot coin up P1.

EDIT: looking at the schematics, this doesn't seem right. A different location is responsible for handling all the "right" functions, CRA2. I'm fairly certain I had P2 right before, and now I seem to have lost it. Swapping the 005273 from its original location and putting another one in may have moved the problem after all.

The reason that P1 cannot coin up may be due to more than just the 005273 being bad. The associated chip beyond the SIP may be damaged too. It could also have been damaged BY the malfunctioning 005273.

I'm going to move the 005273 chips back tonight, and see what happens. If I get back to square one, then I may have to replace a bad 005273 AND find the next problem downstream on the P1 coin circuit....
 
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OK,

I replaced the 2 SIPs.

Now for the bad news. I had to patch 2 traces that were damaged when you pulled the SIPs. You tore the top of the solder pad where the trace met it for both P2 Right and P1 Coin.

After I patched those I replaced the 74LS253 at A27 as the pin for the input for P1 Coin was stuck low.
 
Yeah, I knew my fat fingers shouldn't have been working on those pins. I've got a pretty fine tip for my Hakko 808, but I'm thinking the only reliable way to get those SIP chips off without damaging anything would have been to clip them from above and pull the legs through one at a time. Lesson learned. Hey, at least I dove in and tried.

We'll settle up after you've had a chance to burn test it. Thanks for taking it, and thanks for fixing it. I really appreciate what you do to fix our boards in this hobby.
 
It's done and all boxed up & ready. I played a couple of games on it as P1 and P2. :)
 
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