Printed Board Type: R/F/W/C
Skill Level: Intermediate
Conformance Level: High
Revision: D
Revision Date: Jul 1, 1997

OUTLINE
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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Damaged Legend

PROCEDURE

1. Figure 1: Apply legend using a peg stamp.

   Clean the area.
   
   
2. Scrape off any remaining character or legend with a knife and clean the area.
   
   CAUTION
   Abrasion operations can generate electrostatic charges.
   
   
3. Select the appropriate characters from the peg stamp set or have a special stamp made up.
   
   
4. 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.
   
   
5. Gently press the peg stamp into the epoxy coating to coat the character surface.
   
   

6. Figure 2: Completed legend repair.

   Gently press the peg stamp onto the desired location on the circuit board surface. (See Figure 1).
   
   
7. Cure the epoxy ink per the manufacturer's instructions.

EVALUATION

1. Visual examination for proper characters, positioning and legibility.