Go over the PCB again and check thoroughly for incorrectly placed components,
shorts or open circuit joints.
If all is well, turn off the power again.
Next, mount the 7406 hex open collector inverter, U4, and the ICL232 chip, U3,
taking care of chip orientation as it is very hard to remove these chips once
soldered. Remember about chip handling and static.
Now comes the time to insert the wire link LK1 near the
power jack. This can be a discarded pigtail from a
resistor or capacitor. This link completes the power
connection to the USB chip and its circuitry.
Now insert the PIC16F628 into its socket. Pin 1 is towards the power jack.
Image of the finished PCB.
Connect a serial cable between the board and your PC. This cable is a straight
through type, NOT a null modem cable. In other words, pin 1 at one end
connects to pin 1 at the other end, pin 2 to pin 2 etc.
Make sure the switch is operated towards the [SERIAL] side.
