Do
not touch the transfer film by fingers.
Photocopy
or Laser Print circuit image onto transfer film. (You can not use
ink jet printers)
Prepare: Clothes Iron, Steel Wool #00 and a touch of liquid soap (or SOS ,
Brillo), Packaging Tape, Photocopy or Laser Printed Circuit Image.
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Cut
transfer film, leaving a 1/4" border around the circuit image. Cut
board to size.
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Clean
copper board with steel wool, Scotch Brite© or Brillo© pads. Rinse
cleaned board with soap and water. Be sure to remove all soap residues.
Dry thoroughly with lint-free cloth. Be sure to scrape any burrs that
appear on the edge of the board that may have resulted from the
cutting/shearing process. Burrs tend to keep the iron from making solid
contact with the transfer film. Do not touch the board by fingers
after cleaning.
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Place
transfer film with image face down onto clean copper board. Iron the
transfer film to the board. Some users prefer placing a piece of plain
paper between the iron and the film to reduce friction. Temperature
setting on the iron is critical, and dependent upon your laser printer or
photocopier. Suggested starting temperature is 275-325 degrees F. Iron
settings generally are between the "acrylic" and
"polyester" settings. Time varies with the size and thickness of
the board. Generally this is 1.5 to 4 minutes. DO NOT USE STEAM!
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Quench
the board/film combination under cold running water. Peel the film off.
To remove, if necessary, small "fills" in between traces
and "filled donuts", cover the imaged copper board with clear
packing tape, and then remove. This will pull all unwanted filled areas
off the board.
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After
removing "fills", trim the board (if necessary) to the final
size. Wash the board in soap & water before etching to remove surface
oxidation. Etch with any standard copper board etching solution --
Ammonium Persulfate, Ferric Chloride, etc.
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Using
steel wool, scrub the transfer peel image off as to reveal copper traces.
This is best done under running water. Suggestion: Do not do this until
you're ready to drill and populate the board. The peel transfer
resist protects the board from oxidation.
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