Circuit Board Repair Guide > Basic Circuit Board Repair Procedures > 2.6.2 Legend Marking Using Hand Lettering Method

Legend Marking Using Hand Lettering Method

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The hand lettering method can be used to add, change or replace legend and markings on printed circuit boards or printed circuit board assemblies. This procedure uses epoxy ink and a pen to hand letter the legends on the printed circuit board surface.

IPC Acceptability References
IPC-A-600 2.0 Externally Observable Characteristics
IPC-A-610 8.0 Marking
 
Related Procedure References
CTC 1.0 Foreword - Circuit Board Repair Guide
CTC 2.1 Handling Electronic Assemblies
CTC 2.2.1 How to Clean a Circuit Board
CTC 2.2.2 Cleaning Circuit Boards, Aqueous Batch Process
CTC 2.5 Baking and Preheating of Printed Circuit Boards
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

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

Damaged legend

Damaged Legend


Apply legend using 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.
 
Completed legend repair

Figure 2: Completed legend repair.


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




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