Replace the old leaky capacitors before (or after) they damage your precious vintage Macintosh motherboard. I'm am selling sets of new capacitors for reworking old Mac logic boards. A set of fifteen capacitors is $10 shipped in the USA.
Tantalum capacitors will not leak corrosive goo onto the motherboard the way that conventional surface mount electrolytic caps do when they get old. You may choose any assortment from the following choices: Surface Mount (tantalum): 47 uF 16V AVX TAJD476K016R Size D 1 uF 35V KEMET T491B105M035 Size B 10 uF 20V AVX TAJB106M020RNJ Size B Axial (with leads coming out the ends): 220 uF 35V Axial Electrolytic Capacitor. 470 uF 16V, 105C Axial Electrolytic Capacitor (approx. 3/4" long X 3/8" diameter) 470 uF 50V, 105C Axial Electrolytic Capacitor (approx. 1" long X 1/2" diameter) Additional capacitors beyond the first fifteen are $.50 and do not add to the shipping cost. If you need two sets, do not double the $10 per set cost, just add additional caps at $.50. So, for example, if you want 30 capacitors total, your cost is $10 for the first fifteen plus 15 X .50 = $7.50, for a total of $17.50 per 30. If you're outside the USA the cost will be $10 plus postage to your location by 1st Class international, which will usually be under $3, i.e. <$13 total. These caps are good replacements for the old leaky electrolytic surface mount capacitors (look like tiny fuel storage tanks on your logic board) of the same values. The larger "fuel storage tanks" are usually 47uF and the smaller tiny ones are either 1 uF or 10 uF. For example, the SE/30 contains ten 47uF surface mount electrolytic capacitors, one 1uF surface mount electrolytic capacitor, and one each of the 220uF and 470uF axial capacitors. The IIci contains eleven 47uF and two 10uF surface mount electrolytic capacitors and three 470uF and one 220uF axial electrolytic capacitors. That's actually seventeen total, so for a complete IIci set you would need to add two additional capacitors to the $10 set of 15 for a total of $11.00 for 17. In my experience, the easiest way to remove the old caps is to use two soldering pencils at one time. That way you do not put mechanical stress on the circuit board (as you do when you heat one side at a time). A grounded 15 watt soldering pencil is available from Radio Shack for under $10. So, if you already have one soldering pencil, go pick up a second one and make this job easy for yourself. If you try to use just one pencil, by the time you can heat the second pad, the first will have cooled. With the one-pencil-method you are forced to either get the entire cap and board so hot that the solder will stay melted while you move the pencil from side to side, or you end up bending the cold solder on one side, while lifting the other side. That over-heating and/or bending is what typically leads to lifted pads on the circuit board. With the two pencil method, you just apply a pencil to each end of the cap to be removed and wait until you can gently lift the cap with little to no resistance. It's useful to have a damp sponge on hand, as sometimes the cap sticks to one pencil tip or the other and it can be wiped off on the sponge. Jeff Walther 8107 Hillrise Dr. Austin, TX 78759 t...@io.com -- You received this message because you are a member of the LEM Swap group. To post to this group, send email to lemswap@googlegroups.com To unsubscribe, send an email *from your subscribed address* to lemswap+unsubscr...@googlegroups.com LEM-Swap is not a discussion list; it is for buying & selling Mac stuff. Reply directly to the person who posted, never to the list. Software piracy is illegal and not allowed on LEM Swap. Except for freeware and software originally provided with computers, no software is to be left on hard drives unless the original installer (not a burned copy) is included, along with any required registration number, password, etc. Shipments valued at US$100 or more should be insured, and shipments valued at US$25 or more should be shipped so they can be tracked. See the list FAQ http://lowendmac.com/lists/swap.html for guidelines on postings, feedback, and dispute resolution. Seller feedback at http://groups.google.com/group/swap-feedback
