This method can be used to add, change or replace legend and markings on printed boards or printed board assemblies. This method uses epoxy ink and an ink stamp to place the legends on the printed board surface in much the same manner as taking a "finger print".
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Minimum Skill Level - Intermediate
Recommended for technicians with skills in basic soldering and component rework, but may be inexperienced in general repair/rework procedures.
Conformance Level - High
This procedure most closely duplicates the physical characteristics of the original, and most probably complies with all the functional, environmental and serviceability factors.
Precision microscope with stand and lighting for work and inspection.
General purpose oven for drying, baking and curing epoxies.
Peg stamps for application of inks to replace text and markings.
Nonabrasive, low-linting wipes for cleanup.
Images and Figures
Figure 1: Apply legend using a peg stamp.
Figure 2: Completed legend repair.
Clean the area.
Scrape off any remaining character or legend with a knife and clean the area.
Abrasion operations can generate electrostatic charges.
Select the appropriate characters from the peg stamp set or have a special stamp made up.
Mix the epoxy ink. White is the most common color. Spread a thin even coating of the epoxy ink on the ink plate or on a smooth surface.
Gently press the peg stamp into the epoxy coating to coat the character surface.
Gently press the peg stamp onto the desired location on the circuit board surface. (See Figure 1)
Cure the epoxy ink per the manufacturer's instructions.
Visual examination for proper characters, positioning and legibility.
Procedure for reference only.
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