Funky switches in Sony KV-4000 TV

[Phil Nelson]

Another KV-4000 owner noticed my article and asked whether I still have any spare switches. Sorry! I have donated the extras that I got from Jim.

But I might as well ask . . .

Has anyone else with a KV-4000 found a source for these switches? They all seem to go bad, so a reliable source would be helpful to know about in future.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[zeno]

Dont remember who but someone had a ton of
TAC switches in there catalog years ago. Try a
search for TAC switch & see whats out there. May
not find the exact ones but maybe something that can be moused.

73 Zeno

[WISCOJIM]

I like the switches that NoPegs found. Looks like they could just be soldered in a bit above the board, and then need no shims. NoPegs - do you have an ID on those?

.

[Popester]

Deja Vu on this thread. Thanks to Phil Nelson and his excellent write up of this switch issue. I bought this set brand new on 1-28-83 for whopping $456 wholesale. Mine was manufactured in June of 1982. I know Sony brought this out in 1980 and at the time was the worlds smallest CRT color television. Here is my record of the repair.

[Popester]

Taking the six underside screws out reveals this board. But switch board is still a bit underneath. Having problems posting more than one photo at a time.

[Popester]

Repair went nicely. I must have had same type of switches Phil did as I had to cut two of the ends off and mount it diagonal. Taking out four screws lets this piece remove so you have some additional room to work.

[Popester]

Now that that is repaired I wanted to test my B&K 1246 color generator I purchased on eBay more than a year ago. These Sony KV-4000 sets have solder pads that you either remove solder at one place or add it at another place on the B board to do vertical and horizontal Centering. My horizontal is slightly to the left of horizontal center. I'll try the adjustment called out in the manual.

[Popester]

Here is a close up of the B board with a toothpick end showing where the solder pad that you short to move the horizontal centering more to the right. The one directly underneath it you can see is already shorted. This would be the pad pairs that center it more to the left of horizontal center.

[Popester]

Set has slight overscan, which I believe was somewhat common. I wish the adjustment had moved it a little more to the right side. But overall I think I'm done. My avatar is this set on color bars after the centering. Here is crosshatch pattern after all my adjustments. Unfortunately there are no pin cushion or barrel adjustments on this set. This is already quite compact and Sony probably made some circuit cuts where they had to for space.

[Popester]

Did this all on the dining room table. Glad I bought the manual when I worked at the shop. I bought a lot of Sony gear and always made a point to also purchase a manual. Here's a shot of my limited workspace last night.

[Popester]

Live off of digital converter inputting into video input on rear of tv. ME tv channel. Batman.

[Popester]

Live off of digital converter inputting into video input on rear of tv. ME tv channel. I dream of genie.

[Popester]

Fox networks cartoon Bobs Burgers.

[Popester]

And finally some last thoughts. This tv is 34 years old. Nothing out there for sale as far as tv goes today would be even working. I'm amazed how well sets from the 40's up to late 80's are still able to work and be repaired and enjoyed as projects today. My last picture is of Johnny Carson. The tonight show was king when he was host. I liked Leno, but Jimmy Fallon I don't find his kind of humor funny. Conclusion is this. I'm getting older and I appreciate a time that was better when I was younger. May all you fellow tv and video buffs keep this great age of electronics running for many years to come.

If anyone can explain why I can't download more than one image at a time I'm all ears.
Editorial note. My photos were taken with an iPhone 5S. These live shots off the air introduce a slight moire effect of colors that aren't on the tv screen. I wonder if my DLSR camera would be a better choice in pictures in the future.

Live off of digital converter inputting into video input on rear of tv. Antenna tv channel. Tonight show starring Johnny Carson.

[Phil Nelson]

Thanks for supplying those additional notes & photos, Popester. I hope this info will help other KV-4000 owners keep their sets alive.

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html