Tektronix FG 502 Resurrection and Repair
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- Опубликовано: 16 авг 2023
- A huge thank you again for all that continue to Join us in the lab for repairs and alignments. The channel would not exist with out all of you so thank you again for dropping by.
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In this video we take a look at a FG502 That has not stood up well against the test of time. After almost calling this one and consigning this one to part out we were able to give it another lease on life! LOTS of mechanical faults in this one and TERRIBLE assembly process makes repair very difficult. But hey we will give it a shot.
** Repair exposes the Tech to mains electric and should only be done by trained personnel. Errors can be fatal. ** 
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I worked on the same unit about 2 months ago. The cosmetics of the front were perfect, no cracks or broken casings. I had a failed IC Gate that went bad. Actually it was temperature sensitive, and between my heat gun, and Cold Spray figured it out, but took about 4 hours.... I also replaced the capacitors, more routine then needed. These are nice vintage units and worth restoring for sure... Thanks for the video, learned a few tricks along the way. Funny how some companies took into count with the design, repairing an item and how to take it apart, English, Germans. But others make it a challenge to disassemble and repair, USA Companies... One USA Exception is General Radio, love working on their equipment!! Working on Phillips and Eddystone and Grundig equipment is just a pleasure.. When Tektronix gear shows up, I get this OH NO feeling... Maybe it is just me!!! 🙂 Robert
Thanks for the video! Any idea why they did the output resistors that way, two 47 Ohm paralleled on the PCB in series with the two 47 Ohm in parallel to the BNC? I get that it ends up being 47 Ohms output impendence but not the need for more than one resistor. Anyway glad to see another unit saved from the trash!
Glad to see you are back to Tektronix devices! There is a guy in japan, he is getting the plastic frame replaced with metal frames, he ordered from a PCB manufacturer, this looked very good.
I think, the pullknob can be also unlatched somehow, but might also be, that I mix this up with the 7k series, I am not fully sure.
I am not sure of that is unique to this plugin or this age. This one was a relatively low serial number. I do need to see if I can order some of the face plates that @NearFarMedia designed as I would like to replace some like on my 505 and 502. He and I correspond frequently via e-mail. The issue with this pull tab, It is one solid piece usually they will separate but on this one for some reason it will not. Even the ones that are put tougher weird there is a roll pin that you can knock out and pull the front part off. It was really weird.
it looks like, the Tektronix Community is rather small 🙂
You say “probably a working unit” about a min in and I Iook at the length of the vid. I’m guessing it isn’t a working unit. Lol. The longer the better as far as I’m concerned.
LOL fair point. I wont spoil anything.
You're not lacking that 1000uF capacitor anymore! Cheaper by the 100, right?
Indeed the price break is significant. I do stock quite a selection so I don't have to wait on shipping. Flat rate shipping is nice but I hate paying $7.99 to ship 2 caps. I am finishing up a descent parts storage system at the moment the lab parts inventory only needs 3 shelving units. Not counting the tubes.
@ZenwizardStudios I just spent close to $200 getting necessary caps for two units. I have been fully testing caps I removed because I'm switching to method of selectively replacing caps, evaluating unit performance again before continuing. Slower, but I'm irked by pulling so many caps that are just fine(lcr and leakage tested). I'm learning how to better understand testing in place with lcr meter. I know it's a continuing debate about recapping approach, but these caps have lasted almost 50 years already!
As usual, youtube tells me 3 days late.