Circuit Board Repair Guide > Basic Circuit Board Repair Procedures > 2.6.1 Legend Marking Using Stamping Method

Legend Marking Using Stamping Method

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The stamping 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 an ink stamp to place the legends on the printed circuit board surface in much the same manner as taking a "finger print".

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 2.6.1 Legend/Marking, Stamping Method

Tools and Materials
Color Agent/Epoxy Ink
Ink Plate
Ink Roller
Peg Stamps

2.6.1 Legend Marking, Stamping Method

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

Damaged legend

Damaged Legend

Apply legend using a peg stamp

Figure 1: Apply legend using a peg stamp.

1. Clean the area.
2. Scrape off any remaining character or legend with a knife and clean the area.
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. 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.
Completed legend repair

Figure 2: Completed legend repair.
1. Visual examination for proper characters, positioning and legibility.

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