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Ajutor depanare sursa SMPS de imprimanta

Guest rirazvan

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Guest rirazvan

Salut pe toata lumea.Am o problema cu o imprimanta, are o sursa in comutatie booster converer cu PWM, forward converter la 24V, restul tensiunilor sunt scoase cu buck converter din cea de 24V. Sursa cred ca are 400W maxim.Imediat dupa alimentare se aude cum condensatorul din alimentare se incarca si descarca periodic la 1/2 secunde. Sursa nu intra in comutatie.Este facuta cu UC3854A, UC3844AD.Am verificat diodele si condensatorii si sunt OK.Ma poate ajuta cineva cu vreo idee?Schema este atasata. Multumesc

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