Question about Technics SU-G75 Amplifier
I have no sound found R703 and R-705 are burned out how can I fix this? I believe they are transistors on the main board is this why there is no sound?
Posted by Anonymous on
when the resistors are burned,means that the transistors are damaged, or the power module is damaged.
and in your case its the power module.
Hope this helps.
Posted on Jan 02, 2016
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Posted on Jan 02, 2017
This happens when one or more components in the power amplifier section has failed.
The protect circuit keeps large DC voltages off the speakers.
The only thing you can check for before finding a tech is that the speakers are firmly connected at both ends. If they are ok, you need a tech
PLease rate my help if this helps
Posted on Nov 09, 2009
Usually this is a defect in the output amp IC. If you have no experience with repairs of these types of units, have it checked by a service shop. If the output AMP IChas failed, it will cost about $75 for a replacement. This unit uses an RSN3306P IC .
Posted on Mar 15, 2010
It's simple I had the same problem , all u need is terminal compound. Here is what u do , open ur receiver inside u see huge heatsink and RSN3305 AUDIO MODULES H are on the heatsink rite , so u do this umscrew them off the heatsink and rest of stuff that is connecter to the heatshink , then when everything unscrewed from heatsink , then u umscrew heatsink its self from the unit , pull the heatsink out and put terminal compoud on it put nice amount and make is nice and smooth its urfinger do that in spot the audio modules were located , then u look and the back of the audio modules and apply terminal compound to the back of them also and also smooth it out with ur finger , make sure its all covered up and smoothly , make sure u didn't leave not even a tiny peace not covered , and after that put it all toghwter , the reason it happens after many years of use the compound that was put there by technics at factory probobly dried out by now and audio modules starting to overheat due to lack of compoud comecctiong to the heatsinck , after that process it will work as new , till terminal compound dries up ... It's simple fix and it will work just as it did out of the store
Posted on May 12, 2012
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