Motorola TS-4J
Can someone confirm what should attach to the selenium rectifiers? Someone replaced mine but there are a lot of loose connections and I'm not sure what goes where. The schematics don't match the spare chassis I have (TS-4J as well).
Thanks, Zach |
I've restored several of these and the published schematics are correct. What differences are you seeing in your spare chassis ?
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2 Attachment(s)
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Attachment 197382 Attachment 197383 This is the actual wiring of the spare. I realize this isn't in proper schematic form, but I didn't wanna confuse myself. |
Right the positives do not touch - the rectifier goes in between. Your spare isn't wired right. Maybe someone was trying to fix it ?
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We can only guess. The spare had numerous evident repairs. It blew both the diodes when I installed it in the main chassis, but hopefully all of the caps are still within tolerance.
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Yeah, today I purchased new electrolytics for all but one of the caps.(The only two that tested good were either before the diodes, or not in the power circuit.) Since I elected to restuff, it should be fairly easy to replace them without unsoldering the whole can, just cutting and resoldering the leads. My parts store didn't have some of the values, so I'll have to make do with a few caps that are higher value (eg a 150uF instead of a 120uF) but it should be alright until I get permanent replacements.
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Well this is intresting, the tubes failed to light, but then I found out that the grounds on the caps weren't connecting properly. After a quick fix, still no high voltage, but all of the tubes were once again lighting properly. When I test the Caps after a quick power on they test alright, but after sitting for some time they test way out of specs. What keeps blowing my caps? How do I troubleshoot this? Both of the diodes appear to have shorted once again as well.
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Start from scratch with the schematic. There are 2 diodes, maybe one was put in backwards. The grounds go to different places so they cannot be tied together. IIRC one cathode end of one diode goes to the ballast, pin5 , and the other to pin 4 of the ballast provided you are using the correct ballast . The cathode end of the diode going to pin 5 now continues to the positive end of the second diode. Check that schematic it's all there as it could be a simple mistake or a wire in the wrong place. I have 7 of these sets and had my share of stupid mistakes. :smoke:
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http://www.videokarma.org/attachment...2&d=1531347472
I might have found the culprit. If C79 has failed that would be enough to short the circuit, right? Its capacitance is way off and it tests at 190ohms. What type of cap should I replace this with and with what voltage? |
If C79 shorted the 200 ohm part of the ballast resistor should of burned up very quickly.
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What should the voltage coming off of pin 4 and pin 3 be? |
I don't find a c79 power supply cap on the ts4j schematic.
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