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Problem: The unwanted resist washes off in the developer with the artwork.
Solution: The artwork is too porous. When you hold your artwork up to the light, you should not be able to see through the dark sections. To correct this, you can try “doubling up” your artwork (have two pieces of artwork 1 on top of each other).
It has been our experience that the best way to print the design is to have the pattern right on the board without even the thickness of the Mylar to cause a possible undercutting of the design. Most important, however, is that the lines and lands be 100% opaque. We recommend using an exposure guide, like our PC50A, so you can see what the density of the artwork must be. As long as the design is lightproof and the artwork has an airtight contact onto the board, then your chances of undercutting will be greatly reduced.
Problem: When making double-sided boards, had to remove background with water. When making single-sided boards, background didn’t move at all.
Solution: Deteriorating situation and must check light source. Whenever the background turns a dark color and is visible and the background remains dark, the problem is probably the UV exposure. The fact that it turned dark is because the Photo resist was only partially activated and not fully activated.
Problem: Background only turns a light color even though the exposure and distance and fixture were correct. The board did not etch when placed in the etching solution.
Solution: When setting up the fixture, the plastic protective shield that comes with the fixture was not removed. This shield must be removed to expose boards because it blocks the ultraviolet light and the resist is not properly activated.
Problem: Used 15-watt blb bulbs.
Solution: The blue in the blb bulb blocks the ultraviolet so that you’ll get partial exposure because the resist is only partially activated. It is important that the bulb is a bl so that the 350-nanometer range is hit and the board will be properly exposed.
Applying Photo Resist Yourself
Question: Can I apply Photo Resist myself?
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visitors to this page since Last Modified: December 11, 2003