APPLE gs IIgs INTERNAL POWER SUPPLY REPAIR KIT: DYNACOMP, $3.50 + $4.55 s/h

Description: Presented to Apple II expertsat 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, madein 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 $4.55 shipping (Shipping is FREE if shipping combinedwith any other larger purchase) NO WARRANTY, BUT ODDSOF SUCCESS ARE GOOD Ordinarily, I offer a 60-day money-back warranty on items I sell. Butfor this power supply repair kit, I cannot give a warranty, beyonda guarantee that all my capacitors are brand new and have notbeen taken out of other equipment. Failure could be a result from faulty soldering. It could also be a result of failure ofother 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 solderinghas been done properly. So, do it! SHOULD THE TWO CAPACITORS BEREPLACED IN ADVANCE, IN ACURRENTLY WORKING POWER SUPPLY? No! Wait until the power supply actually fails! My repair philosophyis, "If the unit hasn't yet failed, then don't fix it." Due to faultysoldering, you could end up with a dysfunctional unit. But it wouldbe prudent to buy one or more of my repair kits now, to set asideuntil 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 markedon its painted casing with a negative (-) lead. Be sure that the newcapacitor's polarized position on the motherboard matches thatof the old capacitor. When viewing into the power supply fromabove, both capacitors have their NEGATIVE lead closer to thepower 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. Withthis approach, it can be difficult to identify visually the correctpins beneath the circuit board. A mistake made here would mean that the wrong component could be loosened anddesoldered! A second problem with direct desoldering is thatDynaComp 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 professionalsoldering station, in which the tip temperature can be chosen directly. My guess is that a tip-temperature of approximately420 degrees Fahrenheit would be best. But a complication ofhigh-temperature desoldering is that the components themselves are exposed to high temperature, potentiallydamaging the components with high heat. Second, use a tiny round twist drill, spun by a Dremel precisiondrill, to bore a tiny hole at the positions of the two old leads, drillingthrough the old solder. Then the old leads are clipped off, the two newleads are inserted through the two drilled holes, and the newcapacitors' leads are fixed with fresh new solder. Apply verticalpressure slowly, to avoid separating the solder trace on thebottom of the motherboard. If the trace becomes separatedfrom the motherboard, this can be repaired successfully bysoldering tiny insulated wires to reconnect any traces thatwere accidentally separated from one another. Third, the soldering technique that I now favor, as thebest, is to use a pliers or small vice-grip to crush eachof the two older capacitors, and then use the two oldwire-leads as "stalks" on which to solder the newcapacitors. This technique guarantees that the correctwires are used, and it allows normal low-temperaturesolder to be used, thus avoiding heat damage to components. The downside of this approach is that it can be tricky toposition the old lead and the lead from the new capacitor,close together so that they are bonded by the fresh solder. $3.50 plus $4.55 shipping (Ground Advantage 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 articlesin Apple II magazines during the 1990s. My Apple II inventions werefeatured at Apple II conferences KANSASFEST 1996, 2013, 2014,2015, 2017, 2018, 2019, 2022, and 2023 at Rockhurst University, Kansas City MO. ============================== INTERNATIONAL: SALESTO OTHER COUNTRIES I will ship to other countries, but specialconditions will apply: Insurance is included whenshipped by medium or large priority mailboxes, internationally. Payment must be viaPayPal, in U.S. dollars. I will retain the postoffice receipt as proof of mailing. The "extra itemsshipped combined are shipped free" rule appliesonly on shipments in flat-rate boxes; forweighed shipments, the shipping cost is based onthe actual combined total weight. Also, I mustguess at the weight / postage cost. I will guessslightly high, but I will refund any excessamount paid for shipping/postage, tothe buyer's PayPal account, afterthe item has been mailed. ======================================= Stephen Buggie, psychology professor, UNM-Gallup Gallup NM 87301

Price: 3.5 USD

Location: Gallup, New Mexico

End Time: 2025-01-07T18:21:36.000Z

Shipping Cost: 4.55 USD