Question about Technics Audio Players & Recorders

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Hi there .......my sa gx303P stereo amplifier/tuner technics ...the cooling fan for the power amplifier works only on a somewhat strong signal .....if you play soft music at low volume the cooling fan doesn't get triggered on ......sounds ok but if you forget to shut amplifier down it's already overheated severely because of the fan staying idle with the power amp still active ........can I modify this condition and see that the fan is always on ?

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  • jg4238jc Dec 03, 2008

    I thank you for your assistance in this most important matter .....Currently I am testing the unit at low volume and monitoring the heat generated by the output section .......It worried me because I usually play this unit at a low volume and consequently the fan isn't activated .....

    Have a great holiday season to you and all your family ........


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I followed up on a tip on fixya .......I am currently monitoring the problem to see if further work is necessary ..

This unit has a fan that only works under a relatively high volume setting , ........it would be perfect if the user played the unit on a high volume setting........nevertheless low volume settings should not cause the unit to overheat........The heat detector circuit may be defective if it does so .......or you may have a speaker mismatch causing a high load on the output thereby causing it to work harder and eventually overheat

Posted on Dec 03, 2008

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These units are designed to only run the fan when necessary. If the unit is overheating, there is a problem in the detection circuit. This is a relatively inexpensive repair. If you are getting overheating when running at a low volume, it suggests that the speakers are not matched to the amp. In other words, the amp is expecting an 8 ohm load and is being presented a lower ohm load. This makes the amp work harder and generates more heat. Check the speaker wires and make sure that they are not frayed or crossing in any manner. Also, verify that the rating of the speakers is correct.

Update this with what you find.

Thanks,
Dan

Posted on Dec 02, 2008

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The make of the amplifier is Technics stereo tuner amplifier and the model No is...


Quite often a receiver or amplifier will show the message "protection" or "protector". Other times, the unit will return to the standby mode and possibly blink the standby light. This is a protective mode that causes the shutdown of the unit to "protect" it from further damage.

Most modern electronics contain additional circuits that monitor the state of the unit. If a problem is detected, the unit is shutdown and a message of some type is displayed as detailed above. This is done to prevent further damage to either the unit itself or any external speakers or equipment.

Lets determine whether the problem is internal or external:
1) Disconnect any external equipment (speakers are the most common).
2) Power off the unit.
3) Turn it on again (this will reset the protection circuit)

If the protection message clears, the external equipment is the likely cause. Crossed speaker wires is the most common cause. If the unit continues to display the protection message, then the problem is internal and the unit will require service.

The most common internal cause is a failure of the output transistors. These can be easily replaces by an experienced service tech. Some units have complete amplifier sections contained within amp-pacs or large ICs often called STKs. They are so called because the generic part numbers for tehm are often STK-xxx. Panasonic uses large ICs with part numbers that start with SVI as well. If you are experienced with audio repair, a simple check of the transistors and the voltage regulators within the same circuit can often reveal teh cause of the problems.

Hope this helps,

Dan

on Dec 30, 2010 | Audio Players & Recorders

1 Answer

Older technics SA-GX100 sometimes left or right speaker will not work until volumes is cranked up


buy some turner cleaner or electrical contact cleaner(radio shack) with the power off take the volume knob off spray into the area where the knob goes(the little metal post) turn the post back and forth with your fingers or needel nose plyers several times (over time dust and dirt build up makes a bad connection) you may have to do this a couple of times dont worry this stuff drys realy fast this should do the trick

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The manuals for these are on paper not electronic files. Is there are particular problem you are trying to solve?

Dan

Jan 06, 2010 | Technics Audio Players & Recorders

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Over heating


make sure there is nothing within several inches of it to start off. if need be, use a small house fan pointed at the amp to help cool it, if all else fails and/or you don't want to hear the noise from the big fan; get a computer fan the same size as the one in the case. connect it in place of the fan that does not work(may have to cut/splice the wires). that should work. oh, check the voltage and whether the fan is AC or DC from the stereo. this makes a huge difference!!!! if the fan says "DC" DO NOT CONNECT AN AC FAN TO IT!!! the fan will short and BLOW UP!!!

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1 Answer

Hook up pioneer stereo amplifier model SA-1270


for audio system always you have left and right channels.
get the output (left&right) from tuner---go to equalizer input left&right.---from equalizer output go to amplifier inputs.and certainly from amplifier output to speaker.

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