$3.5 Buy It Now or Best Offer
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Location: Gallup, New Mexico, United States
Ships to: US,
Item: 325490980508
Seller Notes:“Capacitors are completely new, and they have NOT been removed from used equipment.”
Compatible Brand:For Apple
Country of Manufacture:Taiwan, Province of China
Type:Keyboard
Apple:Apple
eBay Presented to Apple II experts at KansasFest, July 24, 2014. APPLE IIGS /IIe POWER SUPPLY REPAIR KIT FOR DYNACOMP INTERNAL POWER SUPPLY IIgs model # 699-0126 or for IIe model # 699-0133 DYNA COMP CORP. of Redwood City, CA made internal power supplies for the Apple IIgs and IIe during the last years of Apple II production. Dyna Comp Corp. was founded in 1987, and Apple II power supplies were among its first commercial products. These power supplies, made in USA, tended to fail suddenly, without warning. Thousands have been discarded, unfortunately. But 80% of those failures happen because of two small electrolytic capacitors. The IIgs power supply can be restored to life, merely by replacing those two capacitors! I first learned of this at KansasFest 1996, from someone else’s presentation; the 1996 speaker at a IIgs color monitor session described this specific IIgs power supply repair. Note that this repair is specific for the DynaComp IIgs power supply; it does NOT apply to the Astec brand IIgs power supply, made in Hong Kong. The solution is simple: Open the power supply, and identify the two bad electrolytic capacitors (1 mfd, 35 volts), then desolder them, removing them from the motherboard. Replace the two bad capacitors with these: (1 mfd, 50 volts). Viola! In most cases, this solves the problem and the power supply is restored to life. WHAT YOU GET FOR $3.50 PLUS SHIPPING (1) Two electrolytic capacitors: rated at (1 mfd, 50 volts) (2) Two spare capacitors of same type (Total of four capacitors) These capacitors are top quality! They are certified to function well at temperatures up to 85 degrees centigrade (185 degrees fahrenheit). The power supply is unlikely to reach that high temperature level (2) Four 4″ x 6″ clear color photos, close-ups to guide your soldering (3) Two photocopies of my detailed instruction sheet $3.50 plus $4.10 shipping (Shipping is FREE if shipping combined with any other larger purchase) NO WARRANTY, BUT ODDS OF SUCCESS ARE GOOD Ordinarily, I offer a 60-day money-back warranty on items I sell. But for this power supply repair kit, I cannot give a warranty, beyond a guarantee that all my capacitors are brand new and have not been taken out of other equipment. Failure could be a result from faulty soldering. It could also be a result of failure of other components besides these two capacitors; after all, the IIgs and its power supply have been around since 1986, making them more than 30 years old. Still, this repair work has an 80% chance of success, when soldering has been done properly. So, do it! SHOULD THE TWO CAPACITORS BE REPLACED IN ADVANCE, IN A CURRENTLY WORKING POWER SUPPLY? No! Wait until the power supply actually fails! My repair philosophy is, “If the unit hasn’t yet failed, then don’t fix it.” Due to faulty soldering, you could end up with a dysfunctional unit. But it would be prudent to buy one or more of my repair kits now, to set aside until the day when they are actually needed. Get the kits now; My age is now 74.4 years (8-1946), so it is difficult to predict whether I will be around years later, when your DynaComp power supply really needs this repair kit. 😉 Be prepared, get it now. Apple II forever! SOLDERING TECHNIQUES: THREE OPTIONS NOTE that these electrolytic capacitors are polarized, each marked on its painted casing with a negative (-) lead. Be sure that the new capacitor’s polarized position on the motherboard matches that of the old capacitor. When viewing into the power supply from above, both capacitors have their NEGATIVE lead closer to the power supply end that accepts the AC power cord and switch; i.e., towards the left end of the unit. First, you can desolder the leads of the two capacitors directly, removing the old capacitors from the printed circuit board. With this approach, it can be difficult to identify visually the correct pins beneath the circuit board. A mistake made here would mean that the wrong component could be loosened and desoldered! A second problem with direct desoldering is that DynaComp Corp. used a high temperature solder, and it is difficult to liquify that solder with an ordinary small soldering- pencil. This approach is most feasible if you use a professional soldering station, in which the tip temperature can be chosen directly. My guess is that a tip-temperature of approximately 420 degrees Fahrenheit would be best. But a complication of high-temperature desoldering is that the components themselves are exposed to high temperature, potentially damaging the components with high heat. Second, use a tiny round twist drill, spun by a Dremel precision drill, to bore a tiny hole at the positions of the two old leads, drilling through the old solder. Then the old leads are clipped off, the two new leads are inserted through the two drilled holes, and the new capacitors’ leads are fixed with fresh new solder. Apply vertical pressure slowly, to avoid separating the solder trace on the bottom of the motherboard. If the trace becomes separated from the motherboard, this can be repaired successfully by soldering tiny insulated wires to reconnect any traces that were accidentally separated from one another. Third, the soldering technique that I now favor, as the best, is to use a pliers or small vice-grip to crush each of the two older capacitors, and then use the two old wire-leads as “stalks” on which to solder the new capacitors. This technique guarantees that the correct wires are used, and it allows normal low-temperature solder to be used, thus avoiding heat damage to components. The downside of this approach is that it can be tricky to position the old lead and the lead from the new capacitor, close together so that they are bonded by the fresh solder. $3.50 plus $4.10 shipping (first class package) Generous combined shipping discount On hardware purchases, you pay mainly the single largest shipping cost. Other hardware items in same parcel, will be shipped with minimal extra cost. Weighed shipments will be the actual cost. Free local pickup at Gallup NM 87301. I am a self-proclaimed Apple II expert, having authored five articles in Apple II magazines during the 1990s. My Apple II inventions were featured at Apple II conferences KANSASFEST 1996, 2013, 2014, 2015, 2017, and 2018 at Rockhurst University, Kansas City MO. ============================== INTERNATIONAL: SALES TO OTHER COUNTRIES I will ship to other countries, but special conditions will apply: Insurance is included when shipped by medium or large priority mail boxes, internationally. Payment must be via PayPal, in U.S. dollars. I will retain the post office receipt as proof of mailing. The “extra items shipped combined are shipped free” rule applies only on shipments in flat-rate boxes; for weighed shipments, the shipping cost is based on the actual combined total weight. Also, I must guess at the weight / postage cost. I will guess slightly high, but I will refund any excess amount paid for shipping/postage, to the buyer’s PayPal account, after the item has been mailed. ======================================= Stephen Buggie, psychology professor, UNM-Gallup
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