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ToolsEdit

  • Anti-static mat
  • Work area at "T-shirt" temperature. Cold room may inhibit solder paste adhesion
  • Bright light and magnifying glass
  • Low temperature lead-free solder paste[1]
  • Electric skillet (designated for non-food use) [2]
  • (Optional) glass cover for skillet improves heat retention and permits visual inspection
  • Non-magnetic stainless steel tweezers to "pick and place" PCB and components [3]

Method 1: Solder Paste SyringeEdit

  • Clean PCB SMD pads with alcohol on cotton swab to remove oil/dust which would prevent solder paste from sticking to pads
  • Apply solder paste to each SMD pad on PCB using syringe. When solder paste melts, solder will pull itself into place on SMD pad. Minimize paste on each pad--too much paste will create solder bridges.
  • Use tweezers to place SMD components on PCB, applying slight pressure to "set" each component.
  • Preheat (covered) electric skillet to 300F in well-ventilated area
  • Put PCB in skillet (and cover)
  • Wait till solder melts (~30 seconds)
  • Carefully remove PCB from skillet with tweezers. Solder is molten, so parts will be dislodged unless PCB is handled very gently.
  • Let cool before handling

Special ConsiderationsEdit

Applying solder paste with a syringe:

  • Large Pads (>2mm x 2mm): easy
  • Small Pads (>1mm x 1mm): possible with practice
  • Tiny Pads: not attempted and assumed to be very difficult

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