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HEATHKIT ID-29 AUTO TEST INSTRUMENT SCH

OTHER - SERVICE MANUAL
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SERVICE MANUAL
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  • Also known:
    HEATHKIT ID-29 TEST INSTRUMENT ID29 AUTO ID 29
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Relevant OTHER forum topics:
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Sziasztok mesterek ! A gyermekem keresett meg azzal , hogy itt a Tanyán kérdezzelek meg benneteket, kinek van és milyen tapasztalata a fenti szerkezetekkel. Ablak csere előtt állnak, akkor már nem szeretnék kifúrni az új ablak keretet, de redőny is kellene. Tehát : 1., Ajánlott típus ? Olasz , Amerikai , stb. 2., Szerviz igény ? Havonta , évente , esetleg több évente ? 3., Az Alumínium és a műanyag közötti előny hátrány ? Főszempont a hangszigetelés !! 4., Külső belső tokozás előny , hátrány ? 5., Egyenkénti /ablakonként / vagy több csatornás távirányító ? Szívesen vennék minden tapasztalatot , ha megosztanátok velünk ! Köszönet mindenkinek az esetleges tapasztalatok átadásáért előre is !
Battery charger with EM78P41 IC
Working on a speed charge battery maintainer for small engines battery. Heat sink had (2) S2025R T0-220 type components on it. Seems they are an SCR and I have 57 ohms on 1 and 3 pin, so seem they are short. Cant get these anymore but installed S4025R which seems to be better replacement. Before replacing, heat sink seemed to be really hot after replacng on on 
board 10 amp automotive slot type fuse, so seemed these SCR were bad, getting hot woth no load.

Standby LED not lighting with new SCR's installed. Old ones did not have heat sink compound on them, so I used some to better transfer heat. I saw the input of the 7805 1 amp
regulator IC has short, so removed it, and its not shorted, but the feed to it comes from the IC chip on board, a EM78P41 BWD20J. Data sheet for EM78P41 is online. They have pin 16 going to pin 1 of the 7805 regulator. Actual reading on pin 16 to ground is 2.5 ohms. I suspect this IC is shorted output. Is there chance to replace IC or is this repair finished?
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