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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.

Posted by spooky 1 on


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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.

Posted on Sep 08, 2012


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SOURCE: Technics SU-V2 keeps cutting out

An amp will cut out if the output protection circuit kicks in. This circuit compares output power against the preset level. Each channel has it's own, independent protector. There are calculations that can be done, but for a novice the rule of thumb is to "never use a speaker with a power rating less than the amp AND a lower impedance than stated". Typically using a 4 ohm load on a 8 ohm system is inviting disaster. Even if the system does not become a smoke generator, you might notice that though "louder", the sound quality is deteriorated. Many "audiophiles" often hook up some combinations of speakers to have "surround" without really understanding that the collective impedance actually changes (generally lowers).

Posted on Jan 21, 2008



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SOURCE: technics su-a808 amp & sh-ge70 graphic equaliser.

connect your media source(dvd-cd player)to equalizer in-connect equalizer out to amplifier line in-or aux in-connect amplifier out to your loudspeaker.

Posted on Jul 16, 2008


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SOURCE: Technics amp su-vx800 goes in to protection mode

yes it can, it sounds like its over heating, make sure that your product is able to get fresh circulated / cooler air
if it already is, then it probably is a faulty product.

Posted on Nov 23, 2008

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2 dead amps, am I dreaming that I could ever fix them is it even worth it... Sansui Au-101 & Technics SU-X302

it is always good to take on a project from which you will learn a lot
everything is fixable and in the case of electronics it takes a fair amount of electronic knowledge before you begin
You are obviously very keen to do this so you have to start from the right angle to have any chance of success
first you will need a full schematics of the circuitry so that you can see what works what and what is happening after the next component
next get beginner electronic books to get the right ideas and approach because if you know what each component is supposed to do in the circuit it makes it easier to understand a result when you do something
finally all electronic shops uses an oscilloscope when testing circuitry as it shows the wave pattern produced and the voltage after each component
example --- a capacitor shows a stop/ start pattern , ac current shows a wave pattern, dc current a flat line and much more
keep at it but be aware that the project will take time and if you surround yourself with technical publications and the right equipment you will get it working
remember it takes a qualified electronics technician around 5 years of learning to do what you hope to achieve at home

Nov 17, 2016 | Technics Audio Players & Recorders

1 Answer

I have a technics hifi su-ch900 everytime I play a cd or cassette or have the tuner the sound cuts out when its slightly loud, on low volume its fine. I have checked the cables and they are correctly...

I found a link to a CH900 that switched off completely.
If you are not a technician, please don't open the amplifier.
But I think it will be a simple repair. It is not the same problem, but it looks a little simelar.

Also found a service manual, but not complete. Still here is the link

Oct 30, 2013 | Audio Players & Recorders

1 Answer

I have a Technics ammplfier SU-V4X after playing for about 5 mins it cuts out , it gets over heated . what can I do to stop this.does it have a fuse I can remove

you will have to cleac dust or debris from fan exhaust and filter, can cause it to go into shutdown. Amps will do this to protect them from damage. Regards, meder's tv service

Oct 01, 2011 | Technics SUV500 2-Channel Amplifier

2 Answers

Following a split from my boyfriend I really need some help in how to connect up my hifi system. It's all technics Tuner Receiver ST 610L Equaliser SH GE70 Amp SU V470 CD Changer SL...

the amp should have an in and out for the cassette player also,, so you would go from the Out on the receiver, to the in on the cassette,, and out of the cassette to the in on the receiver, I don't have nor can I locate that EQ , but basically,, you need to come out of the eq and back the same way you would a Cassette player,,

Jun 14, 2011 | Technics SH-GE70 Home Equalizer

1 Answer

SU-G86PP-K Technics Amp speakers just quit works good, sounds good, and then goes quiet sometimes wait 5 - 10 minutes and they come back on other times, wait till next day ??????

Check for wire shorts as this changes the impedance and will over heat the thermal cutoff. Too long of wires or too small diameter can do this. If no joy with this, suspect bad speaker or blown amp...

Nov 28, 2010 | Technics Audio Players & Recorders

1 Answer

SUV500 2-Channel Amplifier: Hi! can I connect another technics cd-player,sl...

yes you can connect another cd player to the DAT input of your amp.
input connections like DAT, TUNER, CD, AUX etc (except phono) is just to differentiate between what sources are connected, the amp cannot tell what source is connected and will output the sound no problem.

as for the remote operation, if the 2 technics cd players are switched on at the same time they're going to do what you command from the remote together but you'll obviously be listening to 1 at a time.

May 17, 2010 | Technics SUV500 2-Channel Amplifier

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I have a technics SU-CH7 mini hifi. There is now

Hello I have exactly the same problem did you have an answer since your question.
We think that the problem is power supplier...
Best regards,

Nov 22, 2009 | Technics Audio Players & Recorders

1 Answer

Amplifier goes open after operating for 15 - 20 minutes, no sound

It's probably a solder joint that's intermittant. I see a lot of these in my work.
Have a tech with good eyesight give the main circuit boards a once-over for solder joints that dont look right.

Apr 10, 2009 | Technics Audio Players & Recorders

2 Answers

Technics SU-G70 clicks but doesn't display or sound

I just got mine back from repair shop, same symtoms, they replaced power supply, in your case it was hit and miss for a while, so maybe bad power supply connections inside.

Jan 04, 2008 | Audio Players & Recorders

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