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In my technics amplifier a- voltage is coming every parts in the amp section is ok

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Sorry I don't want to sound rude or ignorant but I do not understand you, could you please explain in more detail in your own language and I will try and translate it and I will try help you further.
What is the model number of your amplifier.

Posted on Aug 09, 2010

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I have a technics amplifiers SU-G90 After it is on for a few minutes I think something gets hot and it will go off. Any Help ?


check for bad solder connections on the amp IC's and voltage regulator - really common problem with technics amps

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My amplifier gets quite warm after10 miuites of turning it on .


resnoble is a subjective term so I assume it is mid range. They should get warm but not hot. Check if there a fan that is not working.

If you do not have the proper test equipment it can be difficult. One thing that causes this is a high frequency noise going through the output section. It would be above audio so you would need a scope to check.

Here are some llinks that may help:



Troubleshooting Repair Guide

This amp is hot Audio and aftermarket electronics

http://www.diyaudio.com/forums/parts/172936-amp-gets-very-hot.html

http://www.harbeth.co.uk/usergroup/showthread.php?1624-Leaving-amplifier-on-and-effect-on-speakers

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1 Answer

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1 Answer

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You can apply the Buzz test! Being careful not to touch the power supply parts, touch the two channels in various places with a srewdriver. On the right you should get a buzz showing the signal is there, so touch the left in the same place! And so on...PS don't short anything with the screwdriver!

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1 Answer

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HI...
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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

Nov 05, 2009 | Technics Audio Players & Recorders

1 Answer

Same problem


The overload indication tells us that there is a problem in the final stage of the amplifier section. This model uses an AMP-PAC or large amplifier IC (part number RSN-3305) which is now defective. If you can solder, try resoldering the pins on this IC. Sometimes a poor solder connection can cause a voltage offset that will be detected as a fault and shutdown the system like this. If the resoldering fails, the IC will need to be replaced. Parts cost will be in the $75-$95 range.

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1 Answer

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The most common cause of this is defective coupling caps inside. These allow some DC voltage to pass through to the final amp stage. This DDC voltage is detected by the protection circuit and the unit shuts down. This unit will require service. Please note that this should be a simple and inexpensive repair. The cost should be less than $10 for parts.

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

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1 Answer

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Hello, is this a Radio Shack PA amp or Jamo amp? The unit is probably in "Protect" mode. Is this a PA system or a receiver...receivers have a protection circuit that will not let the speaker relay activate if the amplifier output section is shorted and sending voltage towards the speakers...so they won't fry!!The speaker relay should activate within 3 to 5 seconds if your output section is ok.

barneyluc

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1 Answer

Parts for Technics SE A900S Audio Power Amplifier


Here ya go.
http://www.vancebaldwin.com/products/?MSCAN7062

Mar 13, 2008 | Audio Players & Recorders

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