One problem at a time, please.
You allege that your timer does not advance even though you replaced the timer. Despite the fact that a TV guy looked at the ATC board does not mean it passed inspection. He has no way of checking the EEPROM chip.
The board controls the Neutral curcuit to the timer motor. If the timer does not advance, chances are a new board will make it happen.
Let's not worry about couplers until the time comes...that's a whole nother avenue...