We have a Mega Electronics PB710S PCB Production line etching station, obtained by a Pledge Note : see Pcb for other references Manual: File:PB BENCH Line and PCB Labstation instructions.pdf Controls for the PCB station The leftmost button on the control panel is mains power. If you see it lit up when no-one is using the tank, please turn it off (but if someone _might_ be waiting for it to warm up, please check first!). Probably a good idea to switch off at the mains as well. Each tank and rinser then has a control section. Working from left to right, these are: The spray bars work best if only one is on at a time (and unless you're making a lot of boards at once, you probably only need one). Working SENO4006 (concentrate, fresh as of 20-FEB-2016) Now contains CuCl2 etchant at ~3M strength. (Heater does not seem to shut down by itself so make sure not to overheat the solution, being worked on) DO NOT put Ferric Chloride in this tank !!!

In fact, please don't use ferric chloride at all - it silts up the tank and is really difficult to clean up. If there is some reason why we wish to use it again, it may be possible to use the 4th tank for it. The bath for Cupric Chloride etch was prepared using the slow method : leave some copper in acid, allow corrosion to occur generating some oxides, add further copper and acid as required. Water, acid, copper and hydrogen peroxide (if used) should be noted as it's easy to over-dilute if you just add stuff randomly. The preparation so far contains 540g copper, 2900ml 38% HCl, 1750ml water. This is ready for use - air has been bubbled through it and it has reached the bright green colour indicating it has converted copper to cupric chloride. The acid concentration appears to be correct and I have reconnected the heater. If the etchant is not bright green, please leave the small fishtank bubbler running. The bubbles will regenerate the etchant. DO NOT ETCH ANYTHING EXCEPT COPPER IN THIS TANK

See File:CuCl.pdf for maintenance instructions. These are basically : Check colour. Titrate against 1 molar NaOH to check acid concentration (this only requires a check for precipitate, no need for acid indicator). fish tank snails babiesAdd HCl if necessary.fish tank heater protector If you use it, don't rely on the small bubbler to provide agitation - keep it moving the whole time (and be careful your board doesn't walk out the end of the basket when you do that). fish tank gravel rakeThe small bubbler is really only there to re-aerate the solution after use, as it's quiet enough to leave on. Currently contains clean water (mainly to protect the heater if accidentally switched on Stripper can be resupplied with:

The pump was replaced with a heavier duty medical unit mostly because it was cheap & available. The original was a fishtank pump and is still mounted on the front of the tank. It worked, but seemed not to have enough pressure available to overcome backpressure if the aeration tube had partly filled with etchant. Fitting it involved a few peculiarities, though. The piping requires some care. Because of the increased pressure available from the pump, if the bubbler is blocked it's possible for the pump to blow the pipe off the bubbler. This can then lead to etchant leak. At present, there are cable ties around the most important joints but NOT where it links to the pump. This tends to result in that joint breaking rather than any other, which is good because it's easily accessible and doesn't cause leaks. If there are problems with it blowing off too regularly, look into the cause : just fitting it more solidly is likely to lead to etchant leaks. Originally, I restricted the airflow into the tank (to avoid excessively vigorous bubbles) by pinching the air tube with a clamp.

This often caused the pump connector to come off, prompting the use of cable ties. When the bubble tube silted up, it was that joint that came undone instead of the pump joint. This was a bad thing. A new configuration places a T joint near the pump with the clamp fitted to the additional open outlet. The idea is to make a controlled leak so that excess pressure is bled off rather than overpressurising the joints. It's likely that this will need to be adjusted as the bubbler silts up. The low-volume pump used for aeration is now teed into the bubbler pipe, so it will either bubble slowly from that or fast from the big pump. I had to add another non-return valve so the aerator air didn't all leak out the restricted leak. { diagram needed } The tank was previously in a school and there is a laminated sheet with usage instructions. It may not be applicable to our use but is worth looking at.learn moreAllDogsCatsFish & AquariumPet FoodCanidae Dry Dog Food for All Life Stages, Chicken, Turkey, Lamb and Fish, 44-Pound ORGANIC & ALL NATURAL ADVANCED HIP & JOINT HEALTH SUPPLEMENT FOR DOGS OF ALL BREEDS, AGES & SIZES,130 SOFT CHEWS, FISH OIL, MSM, CHONDROITIN & GLUCOSAMINE FOR DOGS, MADE IN USA, HUMANE SOCIETY DONATOR Kaytee Koi's Choice Premium Fish Food, 10-Pound Bag EmoursTM Aquarium Sinkable Driftwood Fish Tank Decoration (XLarge( 11 to 14 inches in length)) SPORTMiX Wholesome Fish Meal and Rice Formula Dry

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