SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

[Jeff Pepin]

hi members !

today i work on an old technics amplifier with blowed SVI3206 IC ,, everyo0ne know theses IC become pretty rare , here this amp is sold for about 75$ the price of the SVI IC ,, here is the standard trouble of thechnics engineering , ( failed cooling , PNP power transistor unsoldered themselves and shorted out ,

so my plan is not to replace this HYbrid board , BUt REPLACING ONLY POWER FETS ON IT by subtilise it with standard PNP/NPN power transistor mounted directly on heatsink ,, a lot of time to lost here but if all this become to work , it will be an usefull way to recover Blowed SVI/STK Powers modules .. i will post somes pictures of my devlopment soon , if anywone hane any info to point me in a good direction it will be really appreciated , KEEP In mind i do dat in priority for RESEARCH AND DEVLOPPEMENT , no need to say y will lost some time on that ! but its my plan !
thanks

[stj]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

sounds good, i would try it too with the cost of those hybrids.
dont forget to meter he base-drive transistors incase they are aso damaged.

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

i think the big deal with theses IC's is to solder a wire on it because its not copper based but alloy pcb . i will check if it is possible to solder a wire directly on a SMD resistor or simply The AMP PCB without toutching at the SVI directly , probably i will only need to Tap the 4 Collectors connections that is not identified on my picture im happy if at this point the idea of concept is possible

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

i have a made a noob moove ive unsoldered all 4 before identify it . but if im right , i only need to identify one of these to know the rest i love this project is like reverse engeenering

is the worst Case scenario

[stj]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

if you mean geting the base-drive signals, you could use spring-loaded pins on a bit of stripboard over the module.

you can solder though, you just need a good iron - it's metalised-ceramic substrate.
it acts like a heatsink.

[stj]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

i have a made a noob moove ive unsoldered all 4 before identify it . but if im right , i only need to identify one of these to know the rest i love this project is like reverse engeenering

is the worst Case scenario

lol
maybe you can work out the NPN from the PNP by the polarity of the power rail.

[stj]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

btw, put one under a good magnifier to make sure there is only one transistor and not a darlington.

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

sorry i learn in same time on that , im not sure to know what you mean by Getting the Base drive signal ( if you mean Check for Pin who have Power Supply and pin that receive Audio signal i will be ok for check it out . for the darlington , ive just read about ''Darlington Configuration'' ( fet 1 out thru fet2 in then fet 2 out is cumulative of both ) it look pretty like this configuration but again , Sa m'embete un peu pour l'instant , ''le temps de me démêler avec tout sa ''

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

according to diagram of SVI ,

pin3=ch1 out
Pin4 = +60V
Pin5 = -60V
pin6 =ch2 out

so on my ''mspaint artwork''
both yellow 1'S marks Are +60V
Both Red 4's marks Are -60V
Both Orange 3's marks Are channel 1 Output
And
Both Green 2's Marks Are Channel 2 Output

it leave 4 Connection that is for the signal


SVI

[budm]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

'1' are NPN (Collectors of both Transistor '1' are connected to +VCC pin 4)
'4' are PNP (Collectors of both transistors are connected -VCC pin 5)
BTW, what is the model of this amplifier?

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

Technics Su-G50

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

thanks a lot !! so now , just need to find somes candidats the PnP device returned P-jfet , with 64Volt look like legit info ,

the orange home made box is nothing more than a simple atmega168 electronic device tester found on ebay for 17$ i love it

[stj]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

something is not right.

the transistors should all match,
you should not be seeing bipolar(regular) transistors and J-Fets.

maybe the readings are wrong or one of the parts is damaged.

[budm]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

So far I cannot tell if the output devices are just plain NPN/PNP or MOSFET, cannot find the spec of the module to verify, they do not look like MOSFET.
You also have some ICs in that module too.

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

its probably because one of the PNP ( fake j-fet?) device that not completly blowed , other one is burned , , the 2 other one ( npn look just fine )

[stj]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

chase this guy!
http://www.oocities.org/technicshifi/IC.html

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

So far I cannot tell if the output devices are just plain NPN/PNP or MOSFET, cannot find the spec of the module to verify, they do not look like MOSFET.
You also have some ICs in that module too.

yeah ! and these parts have nothing writted on it , its probably under the solder

npn pair is still intact


but pnp pair is destroyed , i was able to test only one ant its one that returned a JETTE FETTE

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

chase this guy!
http://www.oocities.org/technicshifi/IC.html

if this guy was capable ! i will be capable too , it not need much more to get it work , in the worst case , un capaciteur dans loeuil un peu de fumée , une histoire a raconter ahahah desoler si mon anglais fais dur je m'force beaucoup!

[Jeff Pepin]

Re: SVI3206D Hybrid IC ( BC POWER MODULE BY SANYO)

something is not right.

the transistors should all match,
you should not be seeing bipolar(regular) transistors and J-Fets.

maybe the readings are wrong or one of the parts is damaged.

yep affirmative pnp devices are exploded this amp is an heat victim , pnp devices sliding trip