MJLJ V4 kit assembly guide

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Surface mount Components

The soldering portion of this kit was NOT designed for beginners!

The Megajolt Lite Jr. makes extensive use of surface mount components. 
Hand-soldering SMT components requires advanced soldering skills and a steady hand. 
Individual parts are tiny, and are therefore easy to overheat and damage.

If you are not comfortable assembling this kit after reviewing the instructions, we recommend you purchase a ready-made and tested unit from our online store, offered at a reasonable price.

Before you Begin


Read the instructions completely before soldering your first component.

Do not lose parts

  • Leave the parts in their bags and protective tape: Remove them just before soldering.
  • Tiny flying parts: Be careful when extracting the parts from the tape- they can go flying if the protective tape is removed too quickly. Also, ensure you have a good grip on the part with your tweezers- a missed tweezer grab can send the part flying.
  • Work surfaces and floor: Work in a clean and open area, preferably with hard floors: if a part falls off the bench or flies away from a missed tweezer grab, it will be easier to find.


Use lots of good lighting- best is to use bright overhead lights combined with an illuminated magnifying glass.

Note part orientation

Some components, such as diodes and capacitors are marked with a band indicating their orientation. The markings on these components can be faint- especially with the diodes. Be sure to positively identify the component orientation before soldering- good lighting will help this tremendously.

Do not overheat

Small parts are easy to damage- use minimal heat required for soldering components. It is essential a recommended low wattage, fine-tipped soldering iron be used for assembly.

Assembling the kit

Tools you will need

Below are the essential tools you'll need for this project:

Essential smt solder tools.jpg
Illuminated magnifying glass.jpg
The essential tools for SMT work

  • A fine-tipped, low wattage soldering iron is necessary for precision work.
  • Probably the best tool - a cross-action set of tweezers. This tool is normally closed, allowing you to hold parts with a relaxed grip and reduced tremors.
  • Solder wick. Too much solder and you'll create ugly blobs and solder spikes. use this to clean up your joints by drawing away excess solder.
  • A magnifying glass, preferably illuminated, is useful for identifying package markings and inspecting solder joints.