We have circuit card having MC68302CFE16Care working for repairing it. Although everthing EXTAL, XTAL, DISCPU, HALT, RESET, CS0-3 ..etc and input clamping diodes All of them are OK but there are no signal on address lines. We tested output buffers connected to the address bus found that they are OK too . We disconnected one address line from the buffer and saw still there is nothing on that address output .
Could you advise us what can be the problem or any idea why our CPU cannot start to operate?