Circuit Technology Center
 
No. 2.6.2
Legend Marking, Hand Lettering Method

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
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 2.6.2 Legend/Marking, Hand Lettering Method

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

PROCEDURE

  1. Clean the area.


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


    3. 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

  1. Visual examination for proper characters, positioning and legibility.
  
Solutions Across the Board TM

Product Class:  R/F/W/C
Skill Level:  Intermediate
Conformance Level:  High
Revision:  C
Revision Date:  Jul 1, 1997 
Repair Service Charge

  
Damaged Legend

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

  
Figure 2: Completed legend repair.
Tricks of the Trade
 A little artistic talent is called for. Try using a sharpened wood stick vs. a small paint brush to apply the ink. The epoxy ink used is specifically designed for legend application.
 
 
Home · Services · Guidebook · Products · Training · Top

Circuit Technology Center, Inc.