ST70fan
New Member
Hi folks!
I have just received a very nice condition Sony TA-F6B, for the price of postage & a donation to a charity, from a very generous guy. It's sold as unworking. The seller said it made a loud popping noise (from within the amp) one day and was dead from that moment on. He gave it to a local tech who declared he couldn't fix it...
Having read a couple of the superb & very helpful TA-F6B threads here I thought I'd give it a go. I'm not a pro by any means, but possess good soldering skills and am adept at basic level measuring and adjustment of amps. Have rebuilt Quad IIs from scratch, as well as a ST70 'kit' and a GB150D amp so hopefully I'm good to go with this project.
I've checked the part which usually goes first according to some threads here - the thermal fuse on the input of the mains. I get a continuity reading on my multimeter so I guess in this instance it hasn't blown.
I need to take out the PLPS next and replace all the caps - got some Panasonic & Rubycon 105Cs on order. At a cursory glance with the top of the PLPS off, it looks like the two small value (C606 & C608) caps have been replaced, and the voltage adjustment pot replaced by a quality bourns item.
I've noticed that the original Hitachi output transistors (2SB655 & 2SD675) have been replaced by modern OnSemi parts (MJ21193 & MJ21194) which is a little disappointing. I'll order the original items if/when I manage to get it working so it's all functioning to original spec.
I've also noticed that the relay (RY801) on the mains inlet board (marked PSU Board 'B' in the service manual) has been replaced by an item lacking a cover, unless the tech just lost the original cover. Could someone let me know a suitable replacement for this part please as it appears Sony part number 151527800 is no longer stocked anywhere. Not sure how competant the original tech was as many of the screws are burred, or even of a different type to the originals, so I think he was quite heavy handed. Hopefully he overlooked something simple.
Will post some pics one the camera has charged up
Cheers,
- John
I have just received a very nice condition Sony TA-F6B, for the price of postage & a donation to a charity, from a very generous guy. It's sold as unworking. The seller said it made a loud popping noise (from within the amp) one day and was dead from that moment on. He gave it to a local tech who declared he couldn't fix it...
Having read a couple of the superb & very helpful TA-F6B threads here I thought I'd give it a go. I'm not a pro by any means, but possess good soldering skills and am adept at basic level measuring and adjustment of amps. Have rebuilt Quad IIs from scratch, as well as a ST70 'kit' and a GB150D amp so hopefully I'm good to go with this project.
I've checked the part which usually goes first according to some threads here - the thermal fuse on the input of the mains. I get a continuity reading on my multimeter so I guess in this instance it hasn't blown.
I need to take out the PLPS next and replace all the caps - got some Panasonic & Rubycon 105Cs on order. At a cursory glance with the top of the PLPS off, it looks like the two small value (C606 & C608) caps have been replaced, and the voltage adjustment pot replaced by a quality bourns item.
I've noticed that the original Hitachi output transistors (2SB655 & 2SD675) have been replaced by modern OnSemi parts (MJ21193 & MJ21194) which is a little disappointing. I'll order the original items if/when I manage to get it working so it's all functioning to original spec.
I've also noticed that the relay (RY801) on the mains inlet board (marked PSU Board 'B' in the service manual) has been replaced by an item lacking a cover, unless the tech just lost the original cover. Could someone let me know a suitable replacement for this part please as it appears Sony part number 151527800 is no longer stocked anywhere. Not sure how competant the original tech was as many of the screws are burred, or even of a different type to the originals, so I think he was quite heavy handed. Hopefully he overlooked something simple.
Will post some pics one the camera has charged up
Cheers,
- John
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