I found the microscopic part number and it is a PB1685 This board was in a FT301S. . any schematics for this one?? relay control is provided by a quad 2 input nand gate which drives a npn transistor and in turn switches another? npn transistor on which then activates the relay. I had to sub out the 2sc372 and 2sc735 with 2n2222a. it worked for a while then quit, so I am getting some where. Now, it hangs in tx. I will undo what I did and check the output of the gate.
