Sansui 551

Carlosraj · 7th December 2010, 11:26 AM

Dear Everyone,

I am working on a Sansui 551 Stereo Receiver belonging to a friend. Its left channel was dead. One output transisitor (2SD315) and One Driver (2SA697) were shorted. I replaced both the parts but within seconds they blew up again. One further checking, I realised that a Diode mounted on the heatsink has open. From the schematic, I realised that the diode part number is SV-03F. I cannot get the datasheet for this part as it is obselete. I guess it is a NTC diode to increase the resistance and control the current as the heatsink heats up. I cannot get this part from any electronic parts dealers locally. Can someone advice me on a replacement part number or how to modify this circuit and the actual function of this part. Please help as I am still a junior as far as repairing is concerned.

Thank you

Carlosraj

7th December 2010, 11:26 AM	#1
Carlosraj diyAudio Member Join Date: Jan 2010	Sansui 551 Dear Everyone, I am working on a Sansui 551 Stereo Receiver belonging to a friend. Its left channel was dead. One output transisitor (2SD315) and One Driver (2SA697) were shorted. I replaced both the parts but within seconds they blew up again. One further checking, I realised that a Diode mounted on the heatsink has open. From the schematic, I realised that the diode part number is SV-03F. I cannot get the datasheet for this part as it is obselete. I guess it is a NTC diode to increase the resistance and control the current as the heatsink heats up. I cannot get this part from any electronic parts dealers locally. Can someone advice me on a replacement part number or how to modify this circuit and the actual function of this part. Please help as I am still a junior as far as repairing is concerned. Thank you Carlosraj

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