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Now downloading free:Samsung MM-B5  [report bad file]  

Download Samsung MM-B5 docs - Audio equipment,digital audio, home audio, professional audio systems service manuals and repair information


File information:
File name:hi-fi_repair_217__.pdf
[preview MM-B5] new window
Size:53 kB
Extension:PDF
MD5 Checksum:53ba73caeb7bdcdf7653744d32ea6f42
Mfg:

Samsung

Model:

MM-B5

Original Chassis:by ''il Cinescopio''
Descr:Mini hi-fi repair - Guasto: manca audio [C1-3.3uF/50V]
Group:Electronics > Consumer electronics > Audio >
Uploaded:2009-01-03 18:43:13
User:salvacolnome
Multipart:No multipart

Information about the files in archive:
Decompress result:OK
Extracted files:1
File nameText
hi-fi_repair_217__.pdfAUDIO FLASH N. 217 MARCA / TIPO MODELLO SCHEMA ELETTR. DIFETTO LAMENTATO PROVE EFFETTUATE SAMSUNG / Mini compatto MM-B5 Manca l'audio su tutte le sorgenti selezionate Effettuando prove oscillografiche abbiamo riscontrato la presenza del segnale audio in ingresso al pin 7 e 11 dell'IC JIC3 (TDA 7269A), ma non sui pin 4 e 10, cio in uscita. Al pin 5 del TDA 7269A erano presenti circa 27,5 V contro i normali 16,7 V. Dopo varie ricerche si evidenziata una cattiva polarizzazione alla base del Q1, che provvede a cortocircuitare la base dell'AQ6 tramite il diodo AD29 e la resistenza AR51. Infatti, sulla base di Q1 era presente una tensione inferiore a 0,6 V. Il componente trovato in netta interruzione il C1 da 3,3 F/50 V che, una volta sostituito, ha riportato il prodotto al perfetto funzionamento. (Carmine Santoro) MATERIALE SOSTITUITO C1 - 3,3 F/50 V Dicembre 2005 - Il Cinescopio 63

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