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Integrated Amp will not switch on - SONY TA-V715


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Hi guys,

 

Well, as I mentioned on my intro, I received a SONY TA-V715 stereo integrated amplifier and a CDP-V715 CD Player as part of a package deal. 

 

Unfortunately, while the CD Player works perfectly, the amplifier just refuses to switch on. 

 

I'm positive that I have the correct transformer (240>100V - 300W), so IMO that can't reasonably be the problem (I consulted with TorTech before buying). 

 

It could be that I've done something stupid, like not connect it properly in the first place, although admittedly it is hard for me to see how. Then again, I am a 'noob', so what I know about this could fill a postage stamp. ?

 

I suspect that the amp might be faulty - perhaps it was damaged during transit. Not sure. Perhaps a fuse blew? Who knows?

 

My instinct says to scrap it if I can't get it working - it is insured and the two devices only cost $220, so it hardly seems worth the cost of repairing it (I can still use the transformer to power the CD player if absolutely necessary - currently I use a voltage converter to power it). That said, older and wiser heads might disagree and I'm open to contrary opinions. 

 

The amplifier is 100V, 92W, 50/60 Hz, and dates back to the late 1980's. 

 

The back is in Japanese, but I've uploaded an English translation. 

 

I do have the schematics, which I'll show if necessary, but that's trickier to upload. 

 

Any advice would be much appreciated. Cheers. 

 

 

 

 

 

 

 

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Edited by DaRick
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I managed to find a schematic for the 710 model, as it may have similarity. The 710 has a integrated circuit arranged to protect the amplifier from faults, its part is a uPC 1237H and the way it blocks faults,  is to trigger a relay.  There are also fuses fitted to the 710 model

 

There should be a Sony Service Centre in Brisbane that can advise further. You might need to take along your step down transformer to assist

them to test.    

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Depends if you are confortable taking voltage measurements on a live unit
(warning, lethal voltages inside). First step would be a basic health check of the power supply. Put the schematic on a (google?) shared drive, I'm looking at the TA-V715T, it shows the power amp with STK modules and uPC1237HA based protection circuit.


I assume there is no faint click 4-8seconds after hitting the p-on button.
Possibly the front panel lights are out. Looks like a 1.25AT fuse and a thermal fuse in transformer primary.

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