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pcbetching [2015-11-09 18:49]
miek [Developing] Fix typo
pcbetching [2019-11-10 17:38] (current)
mike
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 ===== Equipment ==== ===== Equipment ====
   * [[http://​www.megauk.com/​uv_exposure_units.php|LV202E UV Exposure Unit]]   * [[http://​www.megauk.com/​uv_exposure_units.php|LV202E UV Exposure Unit]]
-  * [[http://​www.megauk.com/​chemical-applicators.php|SN110 Developer Applicator]]+  * <del>[[http://​www.megauk.com/​chemical-applicators.php|SN110 Developer Applicator]]</​del>​ - These are all used up, get Mega Electronics 600-009 Seno 4007 Photoresist Universal Developer Crystals instead.
   * [[http://​www.megauk.com/​pcb_processing_tanks.php|PA104 Bubble etch tank]]   * [[http://​www.megauk.com/​pcb_processing_tanks.php|PA104 Bubble etch tank]]
   * [[http://​uk.farnell.com/​mega/​3204959/​pcb-fr4-100x160-ds-photoresist/​dp/​3204959|Photoresist-coated PCB laminates]]   * [[http://​uk.farnell.com/​mega/​3204959/​pcb-fr4-100x160-ds-photoresist/​dp/​3204959|Photoresist-coated PCB laminates]]
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 Place the printed design toner side up in the UV exposure box, peel off the protective cover from the PCB laminate and place it copper side down over your design. Place the printed design toner side up in the UV exposure box, peel off the protective cover from the PCB laminate and place it copper side down over your design.
  
-Close the box and expose for ~10 minutes. After exposure the design ​should ​be visible on the PCB but can be very hard to see.+Close the box and expose for ~2.5 minutes. After exposure the design ​may be visible on the PCB but can be very hard to see.
  
 ==== Developing ==== ==== Developing ====
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 This step removes any photoresist that has been exposed to UV light in the previous step. This step removes any photoresist that has been exposed to UV light in the previous step.
  
-Place your PCB in the '​Dev'​ tray and use the SN110 applicator to apply the developer. Press firmly ​to open the internal valve and release some of the developer, then scrub the board gently for somewhere around 30 seconds. Be very careful of damaging the applicator sponge on the edges of the PCB. +Immerse the PCB in a solution of the developer ​crystals (mixed according ​to the instructions)The design should ​show up clearly ​within a few seconds. Agitate for about a minute then remove ​the PCB and rinse with plenty of water.
- +
-Once developed, your design should ​be clearly ​visible on the PCB with a slight green tinge.+
  
 ==== Etching ==== ==== Etching ====
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 Plug in and turn on the etch tank, give it some time to warm up. Plug in and turn on the etch tank, give it some time to warm up.
  
-Put your PCB in it, it takes somewhere around ​minutes to etch. It's finished when all the unwanted copper is gone. If left too long then you'll start getting rough edges and/or breaks in small tracks.+Put your PCB in it, it takes somewhere around ​12 minutes to etch. It's finished when all the unwanted copper is gone. If left too long then you'll start getting rough edges and/or breaks in small tracks
 + 
 +After a short dip in the etchant, all copper to be removed should turn a dull pink. If not, the PCB is either under-exposed or under-developed. You can try rinsing the PCB with plenty of water and returning to the develop step for 10-20 seconds, before continuing with etching.
  
 Once etched, remove the board and rinse with lots of water before touching the board. Once etched, remove the board and rinse with lots of water before touching the board.
pcbetching.txt · Last modified: 2019-11-10 17:38 by mike