Question about Technics SA-DA10N 5.1 Channels Receiver

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Technics/Panasonic Sa-Da 10 A/V reciever

I've lost my right and left channel but, not total sound loss. The switching relay for those channels, one of five doesn't hold. When I slightly flex the board or tap the relay, it will make contact and I will get a very faint sound. I believe I lost the power module for the front right and left channel. I ordered a new relay from electronic goldmine as a good measure. I have worked on ab amplifiers before and have replaced power transistors before. When locating the power amp module I am assuming that they are on the heat sink like power transitors of older amps. Just to be frank where are the power mods, what exactly do they look like and what is the part number and where can they be bought? Back in the day it was so easy, If I lost a channel I'd locate the power transistor for that channel and replace it or if it had static after that I'd replace the affected filtering capicitors. When I opened this thing up it, looked a little different. There are 3 black bars on the heat sink and they have 2ch labeled on them are those the power modules and are power modules the equivelant to power transisitors? There are only 5 powered channels on the sa-da 10 but, there are 3 of those bars = 6ch? There isn't any power for a subwoofer. It has an lfe single for an active sub. Anyways, I have 3 of these amps and I really like them regardless of their badging.
thanks for your help, Thommy

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Those 'black bars' are the integrated preamp/output stages. This has benefits from a production standpoint and even from a quality standpoint since these modules have all the necessary feedback internal to them so using them, one can expect consistent performance without a a bunch of tweaking at the end of production.
If you would post any nomenclature you can uncover on the exposed side, one of us will be able to source them and they have typically not been that hard to find or expensive to purchase.
They are made by a number of different semi houses like National Semiconductor, Texas Instruments, Maxim and several asian houses particularly from Taiwan. The highest power module I've had to deal with was 40+40 watts but I don't recall the PN or maker.
They do die, but often, if you can extract the PN from them, you can find schematics of the innards from the manufacturer on line and use them for troubleshooting. Once you've seen the diagram, they are not all that exotic. PNs typically start with letters and end with numbers such as TDA 1657. Four digit numbers most often are the approximate date of manufacture; 3804 = 38th week of 2004.      

Posted on Dec 13, 2008


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