Ta-F270 1ch dead, SA1684 + SM availability??

hiwiho · 17th January 2007, 12:21 PM

I just received a dead Sony Amp of the mid90's that's two generations younger than the 210 i already own. As the 210 has sort of an inbuild failure of two 2.2ohm resistors, I thought i could fix the 270 very easy.

No, it is a complete redesign and my service manual of the 210 doesn't fit to it at all :-(

Very very obvious one channel has burned out, without having measured anything, all flameproof resistors in one channel have blackened the pcb so i assume both driver and power transistors are gone. However, one of the drivers is not available anymore: Sa1684 from NEC.
What can i use as a spare? Does anyone have a SM of the 170/270 Sony TA-F lying around - where to measure the bias??? My older 210 has two tp connectors for that, this one ain't...

The Sony uses:
SA988 / SA1684 + SC4431 + SD2012 / 2SA1491 - 2SC3855

http://www.listmember.de/diyaudio/ta...esistorbbq.jpg

hiwiho · 26th January 2007, 05:53 PM

Cmon folks, I know you can help

17th January 2007, 12:21 PM	#1
hiwiho diyAudio Member Join Date: Sep 2004 Location: Berlin	Ta-F270 1ch dead, SA1684 + SM availability?? I just received a dead Sony Amp of the mid90's that's two generations younger than the 210 i already own. As the 210 has sort of an inbuild failure of two 2.2ohm resistors, I thought i could fix the 270 very easy. No, it is a complete redesign and my service manual of the 210 doesn't fit to it at all :-( Very very obvious one channel has burned out, without having measured anything, all flameproof resistors in one channel have blackened the pcb so i assume both driver and power transistors are gone. However, one of the drivers is not available anymore: Sa1684 from NEC. What can i use as a spare? Does anyone have a SM of the 170/270 Sony TA-F lying around - where to measure the bias??? My older 210 has two tp connectors for that, this one ain't... The Sony uses: SA988 / SA1684 + SC4431 + SD2012 / 2SA1491 - 2SC3855 http://www.listmember.de/diyaudio/ta...esistorbbq.jpg

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26th January 2007, 05:53 PM	#2
hiwiho diyAudio Member Join Date: Sep 2004 Location: Berlin	Cmon folks, I know you can help

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