PACMAN Coleco repair : component information

Clarky

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Help needed for a PACMAN Coleco repairing

Hello !

First i'm Stef, and i'm new in that forum. I'm very glad to be here :)

So, i've a 1981 handheld PACMAN Coleco game, like this:

coleco-tabletop-pac-man-front.jpg


....and i've a problem: a component is missing on the PCB, so i've not its reference and i'm not able to replace it.

I've searched the schematics but unsuccessfully.

It's the commutation transistor that you can se on that photograph:



If someone has that information, or the schematics, it would be very cool !

Best regards,

Stef.
 
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No one can help me please?

I really would like give another chance to my poor Pacman game :)
 
Without seeing this, it's really hard to tell - I don't have one of those tabletop games, nor have I been inside one... but is this in the power circuit, by any chance? It seems like exactly the kind of place to find a 7805. Look at the circuit, follow the power input, see where it goes, and if it goes directly to this. Similarly, if there are any conventional TTL logic chips, check the 5v pin and see where that goes.

Do you have a good photo of the board?

-Ian
 
I have a few of these tabletop mini arcade games..including one pac-man thats just for parts. I'm getting ready to move soon...but if I can dig them out I'll post up an answer if I can.
 
Its not a 7805 vr, its a 2SCXXXX transistor...cant read the number. Post the number thats on it and lets go from there. If all else fails I have a couple of these games here I could pop open and take a look.
 
Good morning !

And thanks to all of you for your help.

--> Retrohacker, Riptor: unfortunately that photograph is not mine. On my PCB, the component is missing.

--> That80sGuy : thanks for your help!


So, i've finally took the time to understand the role of that transistor by stuying the PCB connections. That transistor is the slicer of the power supply, which is coupled with the transformer.
So, i've searched the doc of the processor and the screen in order to know the Voltage and current needed, and i've wired a common NPN transistor TIP41C that i had on one drawer.

I've finished the repair late in night, i was very very happy (but not my wife because of the huge sound the piezzo produces, i had forgotten it !).

Again thanks to all, i'll be around that forum now to help someone too.

Best regards,

Stef.
 
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