Centipede Trackball Problem

SpookySpaceKook

New member
Joined
Sep 11, 2006
Messages
246
Reaction score
4
Location
Manistee, Michigan
Hey, I have a Centipede cocktail with a trackball issue. The player 2 trackball works fine but the player 1 trackball the archer goes to the top of the screen and stays there. You can bring the archer to the bottom of the screen by quickly rolling the trackball down but the archer moves to the top again and stays there. Left and right works fine. During the test mode instead of the trackball cursor moving around on the screen when you move the trackball the cursor instead flies up and down across the screen at full speed and resembles what it looks like when you hold the thrust button down on an Asteroids machine. I have already socketed and replaced the 2 4584's at E/F10 and E/F11, the LS157 at D/E11, the LS74 at D11, and the 2 LS191's at B11 and C11. I also swapped the Pokey and CPU chip with no change. The last 2 chips in the trackball circuit are the 2 LS257's at D/E10 and D9. Does anybody think that this is where my problem is? There must be a signal either stuck high or low to cause this problem? The board has been tested in 2 different centipede machines and the problem stays with the board. Any ideas? Thanks, SpookySpaceKook.
 
Centipede also has inputs for a joystick along with the trackball inputs. I would look at the LS257 at D/E 10 as it deals with the player one joystick inputs. It could also be a broken pull-up resistor in the joystick input section of the schematics also.

Brian
 
Hey, I have a Centipede cocktail with a trackball issue. The player 2 trackball works fine but the player 1 trackball the archer goes to the top of the screen and stays there. You can bring the archer to the bottom of the screen by quickly rolling the trackball down but the archer moves to the top again and stays there. Left and right works fine. During the test mode instead of the trackball cursor moving around on the screen when you move the trackball the cursor instead flies up and down across the screen at full speed and resembles what it looks like when you hold the thrust button down on an Asteroids machine. I have already socketed and replaced the 2 4584's at E/F10 and E/F11, the LS157 at D/E11, the LS74 at D11, and the 2 LS191's at B11 and C11. I also swapped the Pokey and CPU chip with no change. The last 2 chips in the trackball circuit are the 2 LS257's at D/E10 and D9. Does anybody think that this is where my problem is? There must be a signal either stuck high or low to cause this problem? The board has been tested in 2 different centipede machines and the problem stays with the board. Any ideas? Thanks, SpookySpaceKook.

Have you swapped the trackballs to make sure it's the CPU and not the trackballs themselves? You can just pull one out and connect it to the other's input to see what's up.
 
Back
Top Bottom