Step 1:
Populate DC-DC Converter
1. IC2 (AAT1217)
Make sure to have correct orientation. Pin 1 is marked by the small dot on the part's surface print.
2. R5 (360k)
4. L1 (4,7uH)
3. C4/C5 (10u)
6. check, if DC-DC converter works: Apply 3V external power.
7.Use Volt meter to see, if 4.5V-5.0V are generated (at C5. Then Remove DC cables again.
Now Continue with Step 2.
5. R3/R4 (1M)