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 a brush or roller technique. A stencil is used to outline the characters.

ACCEPTABILITY REFERENCES
IPC-A-600	2.0	Externally Observable Characteristics
IPC-A-610	8.0	Marking
PROCEDURE REFERENCE
CTC 7721	1.0	Foreword
CTC 7721	2.1	Handling Electronic Assemblies
CTC 7721	2.2	Cleaning
CTC 7721	2.5	Baking and Preheating
CTC 7721	2.7	Epoxy Mixing and Handling
IPC 7721	2.6.3	Legend/Marking, Stencil Method

TOOLS & MATERIALS
Cleaner
Color Agent/Epoxy Ink
Ink Roller
Ink Plate
Microscope
Oven
Knife
Stencil
Wipes

PROCEDURE

1. 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 stencil or have a special stencil made up. (See Figure 1).



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. Position the stencil on thecircuit board surface and hold in place firmly



6. Roll or brush the ink onto the stencil. Do not smudge characters or apply excess ink.



7. Cure the epoxy ink per the manufacturer's instructions.