Printed Board Type: R/F/W/C
Skill Level: Intermediate
Conformance Level: High
Revision: C
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 a pen to hand letter the legends on the printed board surface.

ACCEPTABILITY REFERENCES
IPC-A-600 2.0	Externally Observable Characteristics
IPC-A-610 8.0	Marking
PROCEDURE REFERENCE
1.0	Foreword
2.1	Handling Electronic Assemblies
2.2	Cleaning
2.5	Baking and Preheating
2.7	Epoxy Mixing and Handling
IPC7721 2.6.2	Legend/Marking, Hand Lettering Method

Damaged Legend

TOOLS & MATERIALS
Cleaner
Color Agent/Epoxy Ink
Ink Pen
Microscope
Oven
Knife
Wipes
Wood Sticks

PROCEDURE

1. Clean the area.
   
   

2. Figure 1: Apply legend using a wood stick dipped in epoxy ink.

   Scrape off any remaining character or legend with a knife and clean the area.
   
   CAUTION
   Abrasion operations can generate electrostatic charges.
   
   
3. Mix the epoxy ink. White is the most common color.
   
   
4. Sharpen a wood stick and dip the pointed end into the epoxy ink. Hand letter the legend or markings as needed.
   
   
5. Cure the epoxy ink per the manufacturer's instructions.

EVALUATION

Figure 2: Completed legend repair.

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