So I have a BK, it has a problem where it locks up in attract mode, a solenoid will kick then it locks.. on reboot it will sometimes blow the solenoid fuse.
a power cycle normally fixes and sometimes it wont...
sound works all the time, I can diagnose and it plays sounds like it should, till reboot.
+12 +5 look ok from the power supply, checked on testpoint TP1 and TP9 for +12,+5 respectively
I pulled the MPU, hooked up to my bench power 5v and booted the board up.. jumpered the (test points)TP8-TP8 to simulate the reset circuit ...
here is where things get wacky... about 10% of the time the board will reset with no issues, '0' on boot... jumper TP8-TP9 '0' clears out and everything good. I can hit diagnostic and things all good (all good = nothing on LCD and nothing on LED)
about 85% of the time I get a 0 for CPU lock, I then need to reset MPU and try again... (remember I am bypassing the reset-circuit and jumpering test points TP8-TP9 using nothing but 5v clean from a trusted source)
sometimes it will throw a random number error about 5% of the time
so any help would be awesome