Question about Technics SU-G75 Amplifier

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Technics SU-G75 has no sound

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?

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Hello
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.


Technics SU-G75 has no sound - 23392686-biweyzzz1swyjlxgbbebmoak-5-2.jpg

Posted on Jan 02, 2016

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Posted on Jan 02, 2017

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SOURCE: Technics SU-G75

I had the same problem. The solution to me was presoldering transistor Q708. http://www.flickr.com/photos/37147023@N03/3511227679/?edited=1

Posted on May 08, 2009

petraman7
  • 1175 Answers

SOURCE: Technics su-Z750 Intergrated Amplifier stays in Standby

HI...
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

  • 4234 Answers

SOURCE: Technics SU-G95 Amplifier and no sound on left speakers

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 .

Dan

Posted on Mar 15, 2010

  • 1 Answer

SOURCE: my technics su-g86 has no sound but has power?

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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Greetings
the power module is damaged and the components ... as you described, resistors burned and other components are over heated .
you need a service technician if you are still hanging on your baby :)
unless you are a technician .i will be glad to send you send you schematic.
i cannot post it as(PDF).

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