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You cant buy one unless youre an authorized Apple repair center. Finally, I turned to the MacTutor advertisers and called Computer Quick. Least helpful was the service department of the local Apple dealer -Sorry, theyre made exclusively for Apple.
Local hardware, auto supply, appliance service, and specialty tool stores (I tried at least fifteen altogether) failed to produce a long-shafted Torx T-15 screwdriver. I returned this immediately for a refund. The readily available MacSnap Toolkit is not worth the expense -a long piece of allen wrench stock, which fits only some of the screws, is supplied in lieu of a Torx screwdriver. I found that the hardest part of the repair was locating the appropriate tools to open the Macs case. Note that none of these problems were plainly visible to the naked eye -a magnifying glass was required A quick check of the solder joints on the remaining showed a potential problem on the end pins of the ten-pin power connector. In this case, it looked like the original connection suffered from either improper cleaning of the coil lead, or too little flux and heat during soldering. I also found a bad solder joint on one of the leads of a coil in the same horizontal sweep circuit, and resoldered that as well. Its no wonder there was local heating leading to a joint failure!
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Thus, the contact area was limited to a very thin film of solder bridging the connector pin to the foil on the PC board. What surprised me was that I found that NO solder had flowed between the pins and the(Im assuming -too late to check) plated through holes in the PC board. I removed the old solder with a solder bulb and carefully resoldered all four pins.
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I found a crack around J1 pin 4, just as indicated in the earlier articles, and signs of developing cracks around the other pins of J1.
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It is tricky to solder the full range of these components on a wave solder machine -too little heat and the leads of the large components dont get properly soldered, too much heat and the delicate components get fried. The Macintosh power supply board (which also provides the circuitry to operate the display) contains a wide range of parts, from integrated circuits to high-power components.
Id like to shed some additional light on the subject, since I suspect that many owners of older Macs will face the same problem eventually. I recalled that there was a discussion of these symptoms in Mactutor, and found a detailed description of the problem and its cure in the June and July 1987 issues. Over a period of a couple weeks, under light use, my screen went from an occasional blink (accompanied by a snapping sound) to a thin vertical line.
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Thanks to MacTutor, my Mac is alive and well at minimal expense following a sudden failure of the power supply board. NOTE: See Mar 89 Lettersfor bug fix and comments about this code.
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Moveq #1,D0 set return code to Rts return Move.B (A0),D1 length of the first string In my routine, the Pascal string length fields are compared as just another character in the comparison loop instead of separately.ĬompareString Moveq #0,D0 initialize flase return code My routine to compare two Pascal strings uses substantially less code than the optimized routine published in Donald Koschekas HyperChat column in November, 1988 issue of MacTutor. Putting this together, we get $276 for SE and $178 for the Mac II The high order byte is 0 for the 128K ROM, 1 for the Mac II and 2 for the SE, while the low order byte is the ROM version number. In fact, the routine in the ROvr resource checks against the version word at location 8 higher than the start of the ROM. For the SE and Mac II, it would be reasonable to assume that the version numbers listed in IM V-xvii would apply, $76 and $78 respectively. The first word of a ROv# resource is the version number of ROM to override, and is $75 for the 128K ROM. This resource startup scans the system file for ROv# resources of any ID, which indicates what resources to override. As described in IM IV-20, one needs an ROvr resource ID 0, which my system file (4.3) already had. If one is designing a resource that is to replace one in the ROM, merely placing the new resource in the system file is not sufficient. This saves time in that these resources arent loaded from the system file when needed, and saves space in that RAM isnt taken up by them. When Apple upgraded to the 128K ROM, some of the extra space was filled with ROM resources that were previously only held in the system file. Jan 89 Letters Volume Number: 5 Issue Number: 1 Column Tag: Lettersīy David E.