Mad planets issues

CharlesD4341

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Having issues with my mad planets

Have random letters and numbers on the screen but the board boots up and games can be played.

also trigger wont work,fire is automatic and stays on. joystick was taken apart and everything is fine switch etc......, game plays fine otherwise.

ideas?

Interconnect board sauter reflowed
all roms reseated
 
For the trigger, get a copy of the manual and work back from the trigger input to the board... probably a stuck pin on a buffer or something similar.
 
don't those have those special interface boards that run from like a ribbon cable to one of those IC plugin things? (like a Ms. Pac daughtercard to Z80 socket)
 
don't those have those special interface boards that run from like a ribbon cable to one of those IC plugin things? (like a Ms. Pac daughtercard to Z80 socket)



The interface board does have a separate ribbon cable, but that only controls the Spinner, not the joystick.

I would start by tracing out the Fire button wire and make certain that the ground wire for the joystick is also attached.
 
The Fire button should be connected to A9-P2-8 and follow all the way through to the edge connector (A1-J1-21). Usually it's a blue wire coming from the joystick to the control panel molex.
 
The interface board does have a separate ribbon cable, but that only controls the Spinner, not the joystick.

I would start by tracing out the Fire button wire and make certain that the ground wire for the joystick is also attached.

ah that's what it was. don't have a Mad Planets of my own, or any to even work on. I just remember a friend of mine telling me about that board.
 
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