Circuit Board Repair and Rework Guide > 2.0 Basic Procedures > 2.6.2 Legend Marking, Hand Lettering Method

2.6.2 Legend Marking, Hand Lettering Method

Printed Board Type: R/F/W/C | Skill Level: Intermediate | Conformance Level: High | Rev.: C | Rev. 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 References
CTC	1.0	Foreword
CTC	2.1	Handling Electronic Assemblies
CTC	2.2.1	Cleaning, Local
CTC	2.2.2	Cleaning, Aqueous Batch Process
CTC	2.5	Baking and Preheating
CTC	2.7	Epoxy Mixing and Handling
IPC7721	2.6.2	Legend/Marking, Hand Lettering Method
Tools and Materials
Cleaner Color Agent/Epoxy Ink Ink Pen Microscope		Oven Knife Wipes Wood Sticks

Procedure

Damaged Legend

Apply legend using a wood stick dipped in epoxy ink.

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

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.	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.

Figure 2: Completed legend repair.

Evaluation

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