Got for repair this (never seen before) War of Aero PCB, a shooter released by ALLUMER in 1992.
Board was in very good condition :
But it was dead, no sign of life on power up.As first thing I went to check with a logic probe the 68000 CPU (in SDIP64 package) and found the clock input was stuck low :
I traced the clock pin back to a 74HC368 that drives the 16MHz signal generated by the nearby DIP14 oscillator :
Probing the output of the oscillator with a scope confirmed it was dead, no square wave from it :
I promptly removed the part :
And installed a spare :
This brought board back to life :
No other issues found so another board succesfully repaired.
