#31
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Quote:
Ed I did some more checking today, it seems the ETF Riders schematic for the TS-4J is for the early version. I added a picture of the schematic for the late version power and filament supply. Last edited by EdKozk2; 07-18-2018 at 07:03 PM. Reason: More info |
#32
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Added a schematic to the previous post.
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#33
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Quote:
Quote:
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"If it isn't broke, you aren't trying hard enough" Last edited by Zsuttle; 07-19-2018 at 11:26 AM. |
#34
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You can download Motorola service info from the Early TV Foundation here: http://www.earlytelevision.org/tv_sc..._motorola.html
I belivebe the only mistake with the Sams is showing some of the filament bypass caps going to B- when they should be the chassis. They changed the ballast tube and the contrast control circuit from the early to late TS-4J. There may be other very minor differences. The power supply circuit is the same. |
#35
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Alright, I've gone over the schematic with a fine tooth comb and determined that every component is in its proper place. (I'll give it to Motorola to make things difficult) Both diodes were installed correctly and the same with all of the caps. Any advice?
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"If it isn't broke, you aren't trying hard enough" |
Audiokarma |
#36
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If all you are saying that diodes and caps are correctly installed then it may be a good idea to trace the ac to find out if any part of the ac was moved in the filiment string to any of the b+ and or b++ by accident or simply a mistake. The only place in the DC circuit that will have ac would be on one side of the diodes to change ac to DC .
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#37
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Another thing to beware is heater to cathode shorts...
Also, you are sure your diodes are installed correctly, right?... May want to double check with a DMM in DC volts mode connected between B++ and B- during power up...
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#38
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It may also be worth checking to chassis ground because who knows what was done to the chassis already and what may have been bad or shorted out already like possibly the filiment caps to ground or maybe a carbonized .470 resistor to chassis. It is a stretch but being the problem is becoming a headache, why not.
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#39
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Well I can definitely confirm that some of the caps going to chassis have shorted. Curious, because on my meter they still show the proper capacitance, however the resistance is just a few ohms. I think this could be the issue causing the diodes to blow. Still on vacation, once I return I’ll be able to tell if that’s been the only problem.
Cheers, Zach
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"If it isn't broke, you aren't trying hard enough" |
#40
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You have to lift one leg of the capacitor befor you check capacitance or ohms.
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Audiokarma |
#41
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Yeah, I’ve made a habit of doing that or completely removing components to test them
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"If it isn't broke, you aren't trying hard enough" |
#42
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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
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"If it isn't broke, you aren't trying hard enough" |
#43
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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 .
Last edited by timmy; 02-10-2019 at 02:53 PM. |
#44
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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 |
#45
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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
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"If it isn't broke, you aren't trying hard enough" |
Audiokarma |
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