Soldering the Main Board
1. Part A – Water Washable Flux
Start with the back side (opposed to the front side which is oriented towards front panel).
1.1. SMT parts (back side)
Start with soldering the SMT ICs U2 and U5.
NOTE: PLEASE use extreme care!
Should this goes wrong, there is no point in continuing.
It’s important to take care not to destroy the PCB pads. It’s a 4-layer PCB and mistakes can
not always be MacGyver’ed in every case. Correct only using hot air or if you use solder wick,
use very narrow ones suited for SMT.
Recommended steps:
1. Place IC and align with an ESD pin
2. VERIFY: silkscreen dot marking pin 1 is aligned with the chip and all pads are aligned
correctly
3. Solder the pin 1 at the dot
4. VERIFY: alignment of pads/pins
5. Solder the pin diagonally on the other side
6. VERIFY: alignment of pads/pins
7. Apply flux
8. Add tiny amounts of solder (if you use too much, you risk bridging pins)
9. Apply flux
10. Use hot air gun to reflow
11. VERIFY: there are no shorts between using the continuity testing function of your
multimeter
OK! You did it! Awesome!
From now on, it’s a piece of cake.
Continue with the remaining back side SMT parts :
1. D3, U3, 0805 SMT Caps).
2. VERIFY: there are no undesired shorts against the
schematics using the continuity testing function of
your multimeter
