ManCave 002 - Tektronix 2201 Oscilloscope Repair Attempt (Part 2)
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- čas přidán 11. 09. 2024
- Part 1 - Troubleshooting: • ManCave 001 - Tektroni...
Part 3 - Power Supply Description and Repair: • ManCave 003 - Tektroni...
Part 4 - Calibration: • ManCave 004 - Tektroni...
In this second part of the troubleshooting Filip swaps the TL494 chip and powers up the oscilloscope to see whether that fixed the problem or not.
Datasheets:
TL494 - www.ti.com/lit/...
TL594 - www.ti.com/lit/...
Disclaimer:
Please do not assume anything being said or shown in this video to be correct! Always check for yourself and learn and follow correct safety practices while you work on any electrical equipment!
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Thank You!!!
I think You should have put all circuit boards back before measuring the power supply output voltage. Any way I also think you did a very good troubleshooting. GOOD WORK....
Thanks for such a concise diagnostic and repair. Well worth the time to watch and learn.
I have 40 years fault finding experience. This was good to watch. WELL DONE.
You should check the ESR of the caps on the supply rails. That trace is very noisy.
+SiliquaeSid Thank you! I'll check the ESR (if I ever get to actually finish the repair) :)
Good video and repair. I picked up a scope much like this model at a thrift store and it had very bad focus. The problem was a 510K ohm resistor in the focus circuit that could be seen charred. As you mentioned in your first video, a good visual inspection for burned parts is a good first thing to do. In my case that is all it took. Thanks for posting.
You were very thorough and I enjoyed the way you explained every thing you tested. I learned a lot. Thanks.
You slowly went through it, good work. When I started working as a tech I worked with an old timer, he taught me to slow down and check things carefully like you did here.
Bri G. Thanks for comment. You do usually get further going slower. ...I wish I always remembered that :)
I too started my electronics learning through an old timer, it was a 555 lol
I enjoyed that, it was good to see your process of elimination and to get a good result of a working scope makes it all worthwhile. Cheers
Well done sir! Thanks for putting it in layman's terms...
Corvette Coupe Pleasure! :) Thank you!
Nice! Good that you warned about explosive components. When I resoldered with hot ear gun14 legs ic from pc-motherboard, the near condensator exploded. Fortunatelly nothing game to my eyes. Now I use safety glasses in future.
Nicely done. Im guessing the higher than spec voltages were no load voltages ! Needed the boards in the rectify that.
I second that; well done on the diagnosis.
Excellent, good practice and procedure followed.
Excellent video young man !
+Jeff Jones Thank you Jeff!
Thanks!
That was awesome. Safety First!!
You bridged some gaps in my knowledge of things.
The commonality of the chip you replaced and its pin mapping and that C1 C2 (are collectors) and E1 E2 (emitters). Ref. pin.. Oh! that PC scope. Is that what they call the "sound card" oscilloscope? If not, who, what, where and how much?
Also, the other thing I learned... the saw tooth (perfect) and the chopped off one.
Then just noise. I am going to watch your next vids now. Get more stuff to fix! :-)
The scope is a PicoScope and is not cheap. If I was to suggest a scope for you, it would not be a USB scope but a proper bench scope. Something like Rigol DS1054 for example...
Great vid, very clear, we should all do the goggles bit when powering up an unknown, 'cos you never know! By the way don't we all love those words ' spares or repair'
I do like your video i undertand the explanation. I think that you have feelling to be a teacher. Good luck.
Great job! Thanks for sharing!
Yo never seemed to come to a conclusion about the voltages and their setting.
Thank you for your great video.
Great Explanation...!!
Excellent Video. Thank you. One question - Why didn't you fit a socket for the regulator in case the replacement blew due to some other fault?
Good job, congrats.
Witek, sp5taa
+Witek TAA Ham Thank you!
TP: I noticed voltage level little high at TP without full load (no digital and interface PCB connected)
just picked one of these up for 15$ on craigslist today. Any chance you still have yours 5+ years later? I am really interested in some good pics of that serial board, tinkers gonna tink you know?
Mine had a open filter cap on the power and a cigarette smoke and cat hair caked fan. probably thermal is what took it down. Anyways thanks for the videos and the schematics you put out there, hope to hear from you.
A job well done.!
satandree mephisto Thank You!
From the Dot to the actual line trace. What did he do ? He messed with voltage Pot. But then he put it back to normal value
. He the re assemble the unit. And the trace was there. So wat did he change. Was it the fact that. With the dot. It was partially assembled. With the trace he put all parts and fully assembled it ?
Good video thanks
Mancave i have a Topward 7045 oscilloscope, and in the trace it have some noise even with the levers on GND it have some noise on the green trace ,can u help me plz
Electronics rule No1. You forgot the obligatory "fingers crossed" before switching on. : )
Nice videos man. :)
Thank you!
HONESTLY! you should invest in a single light bulb!! this would have been an excellent time to be using a dim bulb tester (current limiter)!
You should have used an IC socket.
Great video. Very methodical. Question...what would cause a sine wave to walk on the display?
Triggering isn't locked in.
Why did you not check the caps in the power supply.
I would make sure all the caps are good and you have a smooth
DC voltage coming out of that power supply before going any further.
MrMac5150 You are right, I should've hooked a scope to the output before continuing, too late now:) But thanks for comment! Always open to suggestions.
ManCave
I would like to see more of that scope repair
and calibration, I have one and would rather wait, till I see you go threw yours.
:) ...what are the symptoms of the fault with yours?
abnormal vertical lines, osculating up and down.
sounds like you might just need to give your rotary switches a clean.. I would definitely start with that.