TEST 9
    This does two things:

    a. It puts 0V on pin 14 of U3. This causes it to program the EEPROM
       with A5-5 (address 5 reply Frequency TZ5). This occurs
       automatically as soon as the micro is reset.

    b. A circuit within the test box checks that the Blocking period
      U2A is within the correct limits. If the LED flashes then it is.
      When it flashes it also indicates that the micro has been reset.
      and hence the EEPROM has been programmed. Let it flash twice
      to be sure.

