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Technics SU-X9920D amp cuts out due to overheating unit gets very hot fan motor has been replaced there is also scorching to the PCB

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Keep a fire extinguisher handy and never walk away from it while it's turned on.

If you're NOT overdriving it and it has sufficient all around clearance for coolign airflow you should take it to a competent technician for evaulation before you burn the house down.

Posted on Apr 06, 2011

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I have the same TECHNICS SU A900 MKII as you are talking about and it always runs warm I think using 4R speakers instead of 8R speakers should solve the problem and actually I am thinking of switching to 4R as well.

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You seem to have the answers to your question. I would just resolder the connections anyway without checking. If it solves the problem you have saved yourself a lot of money. If it doesn't follow the other steps in order of cheapness!

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Yes the unit will get fairly hot. If you can keep turning it up at some point the fan should kick in, if it doesn't then it need looking into further.

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Fan quit working. Is it likely the board, or the fan? Currently have a Radio Shack fan mounted; it's 120v, plugged into the AUX power on the back of the unit. It's noisy, otherwise unit works and runs...


Hi, Have got and still use a Technics SA-GX910 Dolby Amp. It had an overheating problem too due to Air temp and power drain etc and the internal fan only engaged at certain volume level. Overheating was overcome by adding another internal fan.
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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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Have you checked the fuse in the unit?

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I have a technics su x502 amp & it works for a while then goes off & then comes back on after about 5 mins,the rest of hifi stays on its just the amp.


take out the cooling unit (the fan) and use a cpu fan out of a pc connected to an external power source like a 12v dc/ac adaptor and use it to blow constant cool air through the hole onto the heat sink. i know it sounds like a ruff job but it does work, my amp doesnt even get hot and it plays all night long without cutting out once. you will get noise from the fan constantly on but i just turn it up louder. this is just a ruff quick fix.

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1 Answer

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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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Sound cuts when volume is turned up


check that power amplifier rating(how many watt)must be more than total speaker rating by 20% at least..
exampel:if speakers watts are 100 watt-amplifier watt must be 120 watt.

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