It is indeed a 26 pin connector, by the drawing it refers to a ribbon connector. It appears that the fluid(possibly water) sensors detect the level and induce a trigger to the 555 timer ICs. Creating an astable pulse out pins 3 of each of the timers. The signal is developed over the R2's respectively and sent out pins 1 and 2 of the connector to whatever board it connects to. Pin 25 is used as a common ground point between the secondary board and the timer circuit. It appears that the off page connection handles the processing of the high and low signals and returns the error signal back through pin 15 to adjust the output of the transistor to cause the speaker to resonate.
The thing that clued me that it wasn't a microprocessor (other than the 'CON1' designation) was the lack of a second supply line (it only has a ground connection). If that's a microprocessor, then where is it getting the power to run?
