Quoted from mikeflan:Hey gang-
Having an issue with my Seawitch. This is a little complicated so here goes:
1) Putting in a coin does not give a credit.
2) In switch test, dropping a coin does activate the correct coin credit switch (Switch 3 I believe)
3) Swapped out another PIA chip in U10 as a shot in the dark: no change.
4) Switched out the MPU with another and the same thing.
Any ideas? Problem came out of nowhere. Would lead me to think it is a wiring issue but I have no idea where to start. In the schematics I noted that one of the coin switches is supposed to have a diode and none of mine have one. But I checked another Seawitch I have and it doesn't have diodes on any of the coin switches either.
Thanks for any info.
Mike
OK, Joe Shadetree, I see you also own a Nine Ball. Beyond thinking that your problem is electronic, the only troubleshooting guide I can offer is one you have already started. Parts swapping; Or when parts become troubleshooting tools.
* Since swapping the MPU offered no change try swapping the SDU.
* Did you swap your Seawitch ROMS into the replacement MPU? Did you reset the DIP switches.
* Disconnect and reconnect all of your wiring connectors.
*If that offers no change, try swapping the rectifier/transformer.
* Disconnect the sound board maybe?
* Disconnect and reconnect all of the LDA connectors.
These are wild ass guesses, I admit. But since you are asking...
I am dealing with an MPU problem on one of my Sterns. Swapping MPUs did not solve the problem and then the (electronic) problem went away on its own but left a different electronic problem that has me scratching my head. I feel for you.