Did I connect this wire correctly to CRT neckboard?

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Brad251
Posts: 270
Joined: Tue Mar 22, 2016 8:06 pm

Did I connect this wire correctly to CRT neckboard?

Post by Brad251 »

https://imgur.com/a/Cbpm5dS

In taking my CRT PCBs out of my JVC D-Series, I had taken this white wire coming from the flyback transformer, out of this white enclosure. I wasn't sure how to reconnect this wire to the metal base inside the white enclosure but thought I might have it? I have the wire clamped between the two sides of the metal base. Based on my picture, does the wire look like it is connected to the metal base correctly?

Also, how do I embed imgur images in a shmups post?
MKL
Posts: 407
Joined: Wed Feb 02, 2005 9:33 pm
Location: Pordenone, Italy

Re: Did I connect this wire correctly to CRT neckboard?

Post by MKL »

Not connected well. Those sockets expect either a solid wire or a stranded wire that is made like a solid wire. You need to cut the end and strip the necessary length. Then twist it so it's as thin as possible and tin it without leaving any excess solder on it. This is done by holding the wire with the end pointing down so that the solder blob eventually slides off. Lastly you clean it with alcohol or contact cleaner as it must not have flux on it. Insert it all the way in the socket contact and when the cover is closed it will squeeze the contact and the wire will be held securely.
Brad251
Posts: 270
Joined: Tue Mar 22, 2016 8:06 pm

Re: Did I connect this wire correctly to CRT neckboard?

Post by Brad251 »

MKL wrote:Not connected well. Those sockets expect either a solid wire or a stranded wire that is made like a solid wire. You need to cut the end and strip the necessary length. Then twist it so it's as thin as possible and tin it without leaving any excess solder on it. This is done by holding the wire with the end pointing down so that the solder blob eventually slides off. Lastly you clean it with alcohol or contact cleaner as it must not have flux on it. Insert it all the way in the socket contact and when the cover is closed it will squeeze the contact and the wire will be held securely.

I'm confused because all I did was take the wire out of the enclosure and now I have to tin it? The wire seems like it was already tinned. Did I possibly mess up the wire when taking out of the enclosure. You can see in the photo that I have the wire resting between that metal flap and one side of the metal base. Where I inserted the wire into the socket, you can see that metal flap in the middle where it forms a triangle below the wire. Should I insert the wire into the base on the outside of that triangle or inside of the triangle?

Also, what is this wire for and what is that white enclosure called?
MKL
Posts: 407
Joined: Wed Feb 02, 2005 9:33 pm
Location: Pordenone, Italy

Re: Did I connect this wire correctly to CRT neckboard?

Post by MKL »

I have that socket. I'll show you how it's done.
MKL
Posts: 407
Joined: Wed Feb 02, 2005 9:33 pm
Location: Pordenone, Italy

Re: Did I connect this wire correctly to CRT neckboard?

Post by MKL »

That's the CRT socket and the wire is the focus voltage wire. It's about one third of the anode voltage so depending on the tube size it's in the 8-9KV range.

Here's a few pics showing what I meant in the above post. Wire is stripped, twisted and tinned:

https://i.imgur.com/SqkVxWY.jpg

The focus contact has a hole in the side so that the wire can go all the way through it, which is possible only if the wire has been twisted and tinned properly:

https://i.imgur.com/An5R6Jx.jpg
https://i.imgur.com/qGDVgac.jpg

At this point the wire is not tight. What makes the connection tight is the cover. When it's closed the tab underneath presses the contact and the wire in between is held tightly:

https://i.imgur.com/6bOUX4F.jpg

It seems to me that your wire doesn't go in enough due to being not well twisted. It's possible that it's making contact but it's not a state of the art connection. You can leave it like that or make it better, it's up to you.
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