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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Philips Fa 951 (2sd1895 and 2sb1255)
Hallo, I'm "burning out" half of the final transistors. Can someone
tell me what am I doing wrong? Should I verify something? I checked already all the components on the board and everything looks OK, but after 5-6 minutes the transistors show a B-E short, and nothing works anymore.Thank's for your time. Best regards. Criss |
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Philips Fa 951 (2sd1895 and 2sb1255)
"crissmuty" bravely wrote to "All" (22 Nov 03 08:47:55)
--- on the heady topic of "Philips Fa 951 (2sd1895 and 2sb1255)" cr From: (crissmuty) cr Hallo, I'm "burning out" half of the final transistors. Can someone cr tell me what am I doing wrong? Should I verify something? I checked cr already all the components on the board and everything looks OK, but cr after 5-6 minutes the transistors show a B-E short, and nothing works cr anymore.Thank's for your time. Best regards. Criss This is an audio amplifier right? Put 100 ohm power resistors (or a lamp) in series with the collectors to limit the current until you can determine which voltages are wrong. It may be an idle current or a DC balance problem. Don't connect speakers until you are sure it is fixed. .... Is reactance then illusory? No, it just appears that way... |
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Philips Fa 951 (2sd1895 and 2sb1255)
Thank you for your answer.
Yes it is a Amplifier. I think also there is a dc current balance problem. The only problem is that the transistors are very expensive and I don't want to try again without a good advice. |
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