Technics SU-V2 keeps cutting out

Hi Les, as a first step, I would disconnect the speaker cables in the Technics su-x501 and test if the same thing happens, if so, there could be a problem with the power supply or also with the speaker output
If it does not turn off, then I would start checking the speaker cables, along the way, in case there is any peeling, which could cause overheating
Once the cables were checked, I would connect the speakers one by one and test with each new reconnection until the source of the fault was detected
I hope you can solve the problem
Regards Franco Dosil

Hola Les, como primera medida, desconectaria los cables de los bafles en el Technics su-x501 y probaria si pasa lo mismo, si es asi, podria haber problema en la fuente de alimentacion o tambien en la salida de parlantes
Si no se apaga, entonces comenzaria a revisar los cable de los bafles, en su recorrido, por si hay alguna peladura, que podria generar un recalentamiento
Una vez revisado los cables, iria conectando de a uno los parlantes e iria probando con cada nueva reconexion hasta detectar el origen de la falla
Espero que puedas resolver el problema
Saludos Franco Dosil https://elektrotanya.com/technics_su-x501_sm.pdf/download.html https://elektrotanya.com/technics_su-x501_sch.pdf/download.html

Sounds like the safety circuit is tripping cutting off the power. Most probable cause a short circuit on the main power amp board, causing an overload.

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.

Being a 500W amplifier, you need to connect speakers with 300W each. The correct method to connect speakers is red terminal of speaker should be connected to red terminal of amplifier & black to black. The left side to left side speaker & right to right speaker. There may be main & remote terminals. Main speakers are the speakers at local place of the amplifier & remote for remotely placed speakers. I do have Technics SU-V85A which is somewhat similar. Enjoy! A nice piece to listen.

If you went so far as looking at the wires on the tweeters you could have taken an ohmmeter to them to see if they're blown.

Is there a back story to this? What preceded the investigation?

usually meens it is protecting itself from destruction
check your wires and speakers for problems

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.

Dan

try rehooking up speaker wires. make sure no bare wire is showing and positive and negative are aligned correctly

hello. we cant help if we dont know what music source you are using.

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.