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Technics SA-400 home audio. The recierver was

Technics SA-400 home audio. The recierver was working fine and stopped with noone fooling with it and it wasn't playing very loudly( turned down) Upon inspection the fuse inside theunit nextot the power supply above two other fuses was blown. the other fuses were OK. I replaced the blown fuse with another 4 amp I found as the external speaker fuse. with nothing connected to the reciever and the volume turned all the way down I turned the unit on and the fuse blew instantly. Is the unit worth fixing? Is the power supply blown? I bought the unit new in 1979. and it did this once before and I don't know what was done to fix it and the place that did the repairs is gone now.

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  • John P Schwantes Jr Jul 05, 2010

    The last answer did'nt tell me anything i DID'NT ALREADY KNOW. The term radionic wasn't known to me. The power supply disconnected from the board still is showing a dead short. Is there a good supplier of power supplys for this unit technics SA-400 ?

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  • Master
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Hello,

the fault is from the output of the amp. The output is bad that's why its blowing the fuse.

Take the amp to any electronic repair store and it will be fixed for you. I think its worth fixing. Any electronic tech should be able to fix the fault.

I can bet that you cannot fix this fault yourself. Take it to an expert and it will be fixed for your.

Good luck.

Posted on Jul 05, 2010

  • John P Schwantes Jr Jul 05, 2010

    If the problem is in the output and the power supply is diconected from the board and is on the bench away from the unit and it still shows dead short how can the out put be involved when its disconnected?

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  • Master
  • 1,561 Answers

Hello,

It is still worth fixing if you are still very much in love with it, otherwise get a replacement for it.

The power supply is not blown, it is only the fuse in this case that is blown, that is the work of the fuse, if it notice any abnormal wiring, it cuts off.

The problem with your device is that some wires or the board is short circuit, to trace this, i would suggest you get a radionic to help fix the problem because it is not what you can do all alone in other not to complicate issue, the wires need to be inspected to ensure there are no bridges on any wires, and the board will need to be check as well to see if there are defective resistor or capacitor on the board, in this case, i advice you get a radionic to help diagnose it.

Take care.

Posted on Jul 05, 2010

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