Xenon Issue

[John Price]

I recently acquired a sadly neglected Xenon. It had no battery so I installed a NVRAM (MPU has no corrosion) and reprogrammed the settings. A couple of things are going on,
every now & then the machine "blanks" out & resets during game play. The other thing is that when the Mota bonus reaches 40K the machine starts adding 100 points like crazy. Any ideas on what's going on?

 

[sylvain]

For the machine that "blanks" out & resets during game play, it could be many things:
o +5V supply too low from Solenoid Driver board (could be filter cap, regulator)
o J4 connector on MPU may have some corroded pins, or MPU J4 header might have cold solder joints
o bad sockets for chips on MPU
o missing diode on a flipper coil causing spike confusing/resetting MPU
o SLAM switch

For the adding 100 points like crazy, probably a 100 pt switch gapped too close (on any of the pop bumpers)
or a leaky/bad 0.05 uF disc capacitor across these switches.
o Placing the machine in diagnostic switch test mode would reveal any detected-closed switches.

Good luck!

 

[John Price]

UPDATE: Source of blanking out has been traced down to the sounds plus board, sent to Tommy for repair. 100 point issue has been traced to a bad capacitor on one of the switches. The machine is fine now, thanks for the help.

 

[sylvain]

Thank you for having posted the fixes.
Well done!

 

[John Price]

New playfield has arrived. Installation to happen at the end of September.

 

[John Price]

Oh no! Machine was blanking out again. Sent my solenoid board to Tommy for repair. He replaced that old capacitor that's on the 5 volt line among other things. Just played a marathon session, all is good now. Unlike the Old Chicago, I will replace the playfield entirely by myself to save on some cash.