Motorola TS-4J - Page 3 - Videokarma.org TV - Video

timmy · #1 07-29-2018, 04:46 PM

You have to lift one leg of the capacitor befor you check capacitance or ohms.

Zsuttle · #2 07-29-2018, 05:20 PM

Quote:

Originally Posted by timmy

You have to lift one leg of the capacitor befor you check capacitance or ohms.

Yeah, I’ve made a habit of doing that or completely removing components to test them

Zsuttle · #3 02-10-2019, 01:57 PM

Alright, well finally managed to get a HV up and running as well as isolate a short. I was able to get a decent picture as well, though it has a slight horizontal jitter. Any thoughts? What's the best way to isolate the source?

Besides the few size adjustments, not too bad.
20190210_145005.jpg

EdKozk2 · #4 02-10-2019, 02:58 PM

The test pattern looks good.

Glad to see you stuck with it on the TS-4J. You may want to try swapping tubes for the horizontal oscillator and afc tube. Maybe corroded sockets and ground connections, rivets. Try the easy solutions first.
Ed

Zsuttle · #5 02-10-2019, 09:54 PM

Tried swapping tubes and cleaning a little bit to no avail. I don't have many mica caps, so I'll have to order them. Hopefully that should work.

Thanks all,
Zach

timmy · #6 02-10-2019, 02:41 PM

I have 6 of these Motorola sets and 2 of them are ts4j chassis and it don't matter early or late, there are Micas in the horizontal and verticle change them you may be surprised at the result as I was with my sets as all my sets but 2 I had to change the Micas in both horiz and vert , they were bad. I had jitters from both sides of deflection as well as verticle would not lock to the horizontal not being right. OH and also look into resistors around the verticle and horizontal circuits they will probably be out of tolerance .

timmy · #7 02-11-2019, 06:25 AM

You will see in the schematic the values of the Micas, IIRC there a couple of 100mmf and I think one 250mmf but check the schematic. What did you use for the hv defection caps.

Electronic M · #8 02-17-2019, 09:48 AM

I've had Tin whisker issues in pots in TS-4 Motos before. Also the Mica caps in the sweep can be problematic.

Zsuttle · #9 02-17-2019, 10:26 AM

I changed the value of the resistor on the wiper of the vertical lock form 3.3m to 4.7m and was able to get a lock on the vertical. However, by replacing other components, the image now looks like this and this.
20190217_111017_004_01.jpg
20190217_111017_005_01.jpg

I think it's something in the video sections affecting the sync signal before it gets stripped?

I've replaced most of the components in the vertical and horizontal sections, though that's made the video worse than what it was before.

timmy · #10 02-17-2019, 02:01 PM

There is also a mica under the 12sn7, horizontal sweep, don't know if you changed that one but if you didn't be careful when changing make sure it's the right value and don't make a mistake putting the legs back in the correct position otherwise the horiz won't run and it will burn up the horiz hold pot. At one point I had changed the resistor to get vert to lock only to realize that I missed a mica in the verticle section and once changed I put back the right resistor and it was fine. Look in the schematic at the vert and horiz section and write down all the caps that are marked MMF those are the ones to change. The one under the horiz tube looks like a dogbone. Although some look like dog bones and others look like a domino.

timmy · #11 02-17-2019, 04:46 PM

Just for the heck of it run the set and turn the horiz hold pot all the way to one end then start back to get the best pic because you can get a pic but will have distortion if turned to much in the opposite position, it's happened to me .

TonyP · #12 02-17-2019, 05:59 PM

Ive recapped my VT71 and it has a case of slight horizontal and vertical jitters. then again, every tv where i use the dvd plaver has the same jitter issue. i wish i had ann over the air signal to use. maybe it the video source causing the jitters

timmy · #13 02-17-2019, 06:29 PM

Quote:

Originally Posted by TonyP

Ive recapped my VT71 and it has a case of slight horizontal and vertical jitters. then again, every tv where i use the dvd plaver has the same jitter issue. i wish i had ann over the air signal to use. maybe it the video source causing the jitters

did you try one of those 75-300 ohm transformers where it has the threads on one end and the 2 wires on the other, that's what I use and it's perfect.

Zsuttle · #14 02-19-2019, 02:52 PM

Well, I had replaced all of the caps in the sweep circuits. Later today I'll try injecting a composite signal and seeing where that gets me.

~Zach

timmy · #15 02-19-2019, 03:43 PM

Quote:

Originally Posted by Zsuttle

Well, I had replaced all of the caps in the sweep circuits. Later today I'll try injecting a composite signal and seeing where that gets me.

~Zach

It may be possible that the alignment is out just a little, if you check the schematic you can very slightly move the channel 3 adjustment on top of the chassis, but do make sure you have a good signal to start with.