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zal

Denon PMA-790

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Alt amplif greu ?i prost ?ntre?inut, din p?cate. E murdar ?n interior, miroase ur?t... Dintre problemele electrice: un canal zgomotos, dar se aude bine, cel?lalt e mut dar se aude distorsionat ?i mai ?ncet ?i un fenomen bizar: c?nd se ascult? muzic? pe celelalte intr?ri, la ac?ionarea selectorului ptr tipul de doz? de pick-up, ac?ioneaz? protec?ia ?i nu mai revine.  :cursing:  
Dup? demontare s-a constatat c? cond masivi de filtraj au curs, astfel s-a corodat placa cu redresarea de for?? ?i ?asiul, leg?turile de mas?. Cineva l-a mai desf?cut o dat?, dar n-a intervenit corect, a schimbat doar becule?ele arse de pe masc? care s-au ars din nou. Am mai v?zut ?nc? un cond electrolitic umflat pe placa cu corec?iile. 
Am ?nceput demontarea ?i aici e primul set de poze:


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Nu credeam sa vad asemenea condensatori morti la datorie  :smile:

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A fost alimentat la 230 pe priza de 120 ?

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Nu, are trafo ptr 220V/50Hz din fabrica?ie. Dar e posibil s? fi primit mai mult din re?eaua ??rii din care a sosit. Cum ?i la noi s-au apucat unii s? schimbe ce era bine odat?, trebuie s? iau m?suri de prevedere la alegerea unor cond din sursele de alimentare.

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Numai trafo are vreo 10 kile. F?r? el, ?asiul ?l ridic cu degetul mic. 

Edited by zal

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Treaba terminat?. 
Demontat, cur??at, desinfectat, ?nlocuit absolut to?i cond electrolitici, ?nlocuit cablul de alimentare, g?sit cu mare greutate ?i trei becule?e de 16V/40mA, cur??at ?i ?lefuit contactele celor trei relee, verificat reglajele.


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Edited by zal

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