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Old 22nd September 2012, 01:18 PM   #1
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Default Faulty Sony TA-F6B

Hi guys new member here, just registered but have been browsing for a few weeks now.

I've just bought one of these amps which arrived from Germany this morning from a seller on ebay.de with the intention of it replacing a pre-power (Croft/Sugden) set up that I currently have.

I also have the Tuner that accompanies this amp, the FM only ST-A6B and which was another reason for buying the amp.

I've also read the excellent thread below last week in it's entirety because the amp I've bought has faulty VU meters and I was looking for some pointers re repair etc.

Anyway as I said the amp arrived this morning and when I opened the box the amp was delivered in there as a smell of electrical burning and I immediately feared the worst however the amp was sold with the description below (translated with Google translate).

I would like to keep the amp as it really is in beautiful condition cosmetically and I'm not keen on looking for another one I have however contacted the seller and I'm just waiting on his response.

Anyway to the point of the post. I'm not going to try to do a repair myself unless it's fairly simply. I'm just trying to pinpoint where the problem might be in order that I can perhaps get a price to repair the amp or to find out if it is indeed worth keeping and having it repaired here in the UK (I'm in Glasgow BTW).

I have some basic electrical skills and I can use a multi-meter. I've never soldered a PCB before however I am a plumber/heating engineer by trade.

I have a soldering iron which I;ve never used and which is a fairly basic one but I'm more than willing to give it a go if needs be.

I hooked the amp up to to a kettle lead and turned her on and absolutely nothing, no lights on the VU meters or inside either so I removed the top and checked for 240v at the on and off switch which there was on the brown wire to the terminal on the right front of the switch then I operated the switch and there was 240v on the orange wire directly in front of the brown wire terminal.

There is also 240v on the orange wire at the top right of the power supply board above one of the fuses and both fuses are fine and that is as far as I've gone.

I've traced the wires from the power supply board and there are three wires coming from it (blue, grey and black) connecting to the board (bottom left side of the amp) with the two large black caps.

This board has five terminals with those three wires from the power supply board connected to three of the terminals then the wires going to PLPS, which are black and grey, are connected to the other two terminals on that board.

I've no idea of the voltages for those five wires so I didn't want to attempt to test those terminals.

Hopefully someone can help me try to identify where the fault might be, I suspect that it might be the power supply board, I had it out of the amp and there is an obvious dry joint on the rear of the board or what looks like one but it may just be corrosion or flux.

Thanks for reading this.

Regards,

Tony

"Hello! Offer is a vintage stereo amplifier from the goldsmith Sony, a very elegant device with a super sound.

Where technically sound only the lights on the VU meters is on the pale and the right VU meter is defective, otherwise it works fine, optical condition in a super collectible condition."

Sony TA-F6B PSU repair
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Old 23rd September 2012, 02:01 AM   #2
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A caution for newbs and anyone not familiar with the Switchmode power supplies as used in the F6 and identified in the linked thread (a good one):
They are dangerous beasts and obsolete parts you read about can be difficult to substitute so this may not be an easy fix at all. Look at the length and duration of the thread you linked to. It was a long process, even just to get it working properly with Mooly's necessary experience and guidance. I would seek his advice first.
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Old 23rd September 2012, 08:52 AM   #3
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Quote:
Originally Posted by Ian Finch View Post
A caution for newbs and anyone not familiar with the Switchmode power supplies as used in the F6 and identified in the linked thread (a good one):
They are dangerous beasts and obsolete parts you read about can be difficult to substitute so this may not be an easy fix at all. Look at the length and duration of the thread you linked to. It was a long process, even just to get it working properly with Mooly's necessary experience and guidance. I would seek his advice first.
Thanks Ian, yes I kinda realised that there is a lot of high voltage stuff flying about inside the amp.

I've contacted a hi-fi tech as I know my limitations but I would still like to do some more basic tests even if that's just to help inform the tech.

The seller, BTW, is refusing to take any responsibility thus far so it looks like I may be stuck with an expensive ornament unless I can get the amp functioning or I may have to cut my losses and sell it on for spares.

Kind regards,

Tony
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Old 23rd September 2012, 09:17 AM   #4
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Quote:
Originally Posted by twotone 2 View Post
Thanks Ian, yes I kinda realised that there is a lot of high voltage stuff flying about inside the amp.

I've contacted a hi-fi tech as I know my limitations but I would still like to do some more basic tests even if that's just to help inform the tech.

The seller, BTW, is refusing to take any responsibility thus far so it looks like I may be stuck with an expensive ornament unless I can get the amp functioning or I may have to cut my losses and sell it on for spares.

Kind regards,

Tony
Start Paypal dispute!
If you payed by banking transfer you are lost.
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Old 23rd September 2012, 09:28 AM   #5
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Quote:
Originally Posted by QSerraTico_Tico View Post
Start Paypal dispute!
If you payed by banking transfer you are lost.
Thanks, I've opened an e-bay resolution case on both ebay.co.uk and on ebay.de.

I did pay by paypal so I'm going to contact them this morning however I tried to open a dispute last night but paypal just redirected me to ebay.de.

The seller obviously knew that the amp was faulty, I believe he tried it before sending it to me and something blew inside the amp, I can smell an electrical component burning smell which clearly occurred before the amp was put in the packing box, but I think he just took a chance that I would keep it because it is in fantastic condition cosmetically, like new actually.

I knew that the VU meters were faulty before I bought it he sold as working with excellent klang (sound) and said that he accepted returns, he has also over 350 positive feedbacks a lot of which is for selling old hi-fi gear.

A faulty amp sold on ebay uk earlier on this month for 55 plus postage however I paid about 180 inc postage for a working one (sic).

Here are the links to both amp sales.

Tony

Sony TA-F6B Vintage Highend Stereo Amplifier | eBay

SONY TA-F6B INTEGRATED AMPLIFIER FAULTY | eBay
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Old 23rd September 2012, 09:52 AM   #6
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Soon make it a Paypal claim on the sellers Ebay site. (escalate the dispute if the seller does not respond or denies)
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Old 23rd September 2012, 10:19 AM   #7
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Quote:
Originally Posted by QSerraTico_Tico View Post
Soon make it a Paypal claim on the sellers Ebay site. (escalate the dispute if the seller does not respond or denies)
Thanks again.

I opened a case on ebay.de but the case there is now 'closed' on the basis that the seller has refused a return, he is saying that because I opened the amplifier to check fuses and power etc that I have damaged the amp and therefore he has no responsibility now. His answer to the resolution centre is below in quotes.

I've opened a case on e-bay.co.uk and have to wait until Oct 1st before escalating the case on there however how can I escalate the case on e-bay.de?

I called ebay.de customer services last night but the operator told me that they can't support non-German speakers and that I have to go to e-bay.com, presumably he meant e-bay.co.uk which is why I opened a case there.

Regards,

Tony

"I can not accept that the amplifier is to be broken, Auserd would even tinkered."
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Old 23rd September 2012, 04:30 PM   #8
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Hi guys a bit of an update for those interested.

First thing is that the HiFi tech has been in touch and he said that worse case scenario would be that the transformer (PLPS?). He indicated a price for repair which seemed fine but obviously he will have to have the amp to confirm the repair.

There's a couple of threads (below) on Audiokarma one of which mentions the thermal fuse which I've checked and it appears to be okay.

I tested for OC on the soldered terminals on the back of the Power Supply PCB to which it's connected and got a closed circuit.

I'm trying to source two Sony VU 11 meters but not having any luck at the moment however perhaps the existing ones can be repaired or maybe the fact that they didn't work and only light up faintly, according to the seller, is down to the power problem?

Thanks

Tony

Project Amp - AudioKarma.org Home Audio Stereo Discussion Forums

Sony TA-F6B Resto - AudioKarma.org Home Audio Stereo Discussion Forums
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Old 23rd September 2012, 04:48 PM   #9
johnm is offline johnm  United Kingdom
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Sorry to hear of your Ebay problems - hope it gets resolved to your satisfaction, and you at least get a partial or full refund.

This amp is fantastic, when working. Unfortunately mine has stopped working too. Quite gutting after all the effort detailed in that long thread. Can't find anything obviously wrong, but I'm sure it's something to do with that annoying PLPS supply. Incidentally it's VERY common on these amps to have the PLPS capacitors go south and take the amp down. Get your tech to replace all PSU caps with low esr types before doing anything else, though I'm sure if he knows his stuff that'll be the first thing he does. Often that'll solve the problems if everything else is ok, and before anything further was damaged.

Would be nice to come up with an alternative diy psu board that would fit into the same space, and still allow the amp to function to full spec. Those PLPS pcbs are not great quality, especially after all these years and the high temperatures within. Traces can become detached from the board.

Hope you get yours up and running - great design when working as it should.

John.
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Old 23rd September 2012, 04:56 PM   #10
johnm is offline johnm  United Kingdom
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P.S. Regarding the meter, all you can do is keep an eye peeled for the following part number on Ebay:

Sony 1-520-314-00 or 1-518-273-00
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