My hair would be pulled out after working on this intermittent. Good job, Trevor. Going by a few quick glimpses, I see you still have yours on your head.
Intermittent faults are no fun but it's very satisfying when you do fix them ! I always enjoy looking over your shoulder and trying to figure out what the problem is as you work through it but I did not imagine that one, I was thinking it was a loose wire in a connector block or maybe a loose pin in a connector. At one point I was even thinking a partly broken track on the board, I had all kinds of scenarios running through my head until you discovered the pins through the vias.
Nice work Trevor! Always enjoy "working" along with you, and learn a lot from your T-shooting skills. I noticed on that trouble board that it flexes a lot! That can't help the bad via pins problem any. They should have designed in better support for it. Just pushing the connectors on looks like it could crack joints. Thanks for sharing this video! - JRH
I have had this problem with a B&O Beomaster 3-in-1 set. Cost me 3 days. At any given moment, could be 5 minutes, could be 2 hours, the cassette would shut down. No schematic, only household methodes available. Tracked it down to a wire IN a connector. When they crimp on the little spring connectors on the wires, the do that by poking the two sharp sides of the wire holder through the isolation, they bent and poke it towards the core of about 12 individual strands. THAT one wire was probably the end of the bobbin in the factory, and the last centimeter of the wire had only ONE core strand left to connect to and failed.
This video gave me terrible flashbacks. Sony used the same "technology" in their top-of-the-line turntable (PS-8750), and fixing that cracking and oxidizing mess is not fun. JVC also used rivets/eyelets for connecting two sides of the PCBs in some of their products, as did Philips in their early CD players.
Wow, How old is that unit? Through hole plating has been around for ages. I do work on some instruments that don't have through hole plating on vias, but they are from late 60's to early 70's. I charge double on repairs for those because of problems like you are having there.
My hair would be pulled out after working on this intermittent. Good job, Trevor. Going by a few quick glimpses, I see you still have yours on your head.
Intermittent faults are no fun but it's very satisfying when you do fix them !
I always enjoy looking over your shoulder and trying to figure out what the problem is as you work through it but I did not imagine that one, I was thinking it was a loose wire in a connector block or maybe a loose pin in a connector. At one point I was even thinking a partly broken track on the board, I had all kinds of scenarios running through my head until you discovered the pins through the vias.
Have a Nakamichi 582 was FedEx shipped and badly packed. It was a cracked solder mess. Wore a chopstick out tapping and soldering. Well done.
Hey Trevor, good job! I have a Miele washing machine which had the same issue with a "via" like that. Took me ages to figure that out...
Nice work Trevor! Always enjoy "working" along with you, and learn a lot from your T-shooting skills. I noticed on that trouble board that it flexes a lot! That can't help the bad via pins problem any. They should have designed in better support for it. Just pushing the connectors on looks like it could crack joints. Thanks for sharing this video! - JRH
I seem to remember Sansui having a similar issue. The fix was running wires through like you mentioned.
I have had this problem with a B&O Beomaster 3-in-1 set. Cost me 3 days. At any given moment, could be 5 minutes, could be 2 hours, the cassette would shut down. No schematic, only household methodes available. Tracked it down to a wire IN a connector. When they crimp on the little spring connectors on the wires, the do that by poking the two sharp sides of the wire holder through the isolation, they bent and poke it towards the core of about 12 individual strands. THAT one wire was probably the end of the bobbin in the factory, and the last centimeter of the wire had only ONE core strand left to connect to and failed.
Ahhh the joys of working on cassette decks. Just rebuilt my Tascam 112r mk2 bad gears yeah !! ..TERMITEAUDIO
Now THAT is a Boomerang!
Sansui CA-3000 has about 60 of these connections without any pins to connect both sides. Fun times
Ugh, love watching these but they give me anxiety. No wonder why I love older gear! Still bends my brain but usually I can figure it out.
This video gave me terrible flashbacks. Sony used the same "technology" in their top-of-the-line turntable (PS-8750), and fixing that cracking and oxidizing mess is not fun. JVC also used rivets/eyelets for connecting two sides of the PCBs in some of their products, as did Philips in their early CD players.
Great troubleshooting on this one; intermittents are the devil.
Wow................thought you had this whipped. That hidden board looks horrible, surprised it even ran. SONY, they always make things difficult.
I would never found that.
I had a Teac machine years ago that when I used metal tapes I could go up to 12+ DB with DBX
Wow, How old is that unit? Through hole plating has been around for ages. I do work on some instruments that don't have through hole plating on vias, but they are from late 60's to early 70's. I charge double on repairs for those because of problems like you are having there.
Early vias 🤔
At 26:00 what is that green capacitor on the left. Above the 2 yellow ones. It reminds me to those chinese ChongX caps. Or I'm just trippin'
You should pay bud for his gas money
Bad board design that requires vias and not through hole plated. Cheap cheap! Good find!
UHGGG! HATE intermittents! 🤦♂
Look at the third pin
imsai guy youtube channel
Sony jigsaw
Obsolete technology , can't get OEM parts, Can't get no service data, has no value ! Thanks for watching
A sony model to never buy!