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- เผยแพร่เมื่อ 27 เม.ย. 2022
- I picked up a BK Precision Oscilloscope that was on its way to the city dump. Today we diagnose and repair it and
have a quick look at its functionality
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A seized Trig knob, what a result !...cheers.
Good result. From dead to working nicely with just a bit of time and TLC.
I got all excited thinking we had an Artie equipment repair video! Really like the equipment repair video's as I am sure a lot of folks do. It was interesting anyhow. Thanks for your time to entertain us.
You voice a common complaint the I agree with. But I take whatever the universe has to offer, and if all it needs is IPA then so be it.
@@artifactelectronics I am not really complaining, I just really like your repair videos. And your right, why fix what's not broken! Again Thanks for the videos.
Another stunning vid.
We see so many fixes that start with a teardown, complete re-cap, resistor ohm check, control clean then:-
Oh! Look it now works.
Good diagnosis gets to the root cause of the issue and saves time and money.
This vid is a master class in diagnosis good practice.
Thank you.
It's the same with CRT monitors. Some say let's recap it and see what happens. Pointing the parts cannon at a defective piece of equipment may work, but there's not a whole lot you learn from that.
excellent video showing how to properly diagnose a fault before even opening the case, so much information can be gathered by twiddling the knobs and switches, helping you to locate the circuit or switch at fault.
Thanks for the video! Glad you saved it from the garbage bin. Even though no parts were needed, the diagnosis by the symptoms was educational.
Thannks for making this video!
Very (very) COoL. It so easy to "think the worst".. Even when you got to CH B I thought; Uh Oh! I really don't like that about myself :O) Thank you for the video.
Hey, thanks for this video. I pick up trash for a living and some guy was tossing this, so I grabbed it. I know nothing about this unit but I'd like to learn and get this working (I really did't even plug it in yet). By the way I pick up lawn mowers and Dyson vacuums also. Those I can fix. Up to 21 mowers and 12 Dysons now.
Nice find. I wonder how much kit gets trashed that just needs a little cleaning of the controls. I suppose people just want newer and, supposedly, better.
Instead of trying to sync the scope cal wih an external modulated sig from a sig gen, use the output of the sig gen then modulate it from it's internal modulator. Good luck
Tek scopes have a trigger source mode of Norm or Vert. that allows stabilization of signals operating at slightly different frequencies. Basically it triggers based off of the vertical setting, in the case of two signals, that would be Alt or Chop.
Looks to be a newer made and different color version of my older 1474. It looks the exact same on the front panel controls as my 1474 and even the same 30mhz type. Wonder what is different between the two models then? Now I see two differences. It has a video button that my 1474 doesn't have and you have an adjustment for the astigmatism that my older model lacks and I have to actually turn the CRT from the back of the unit to adjust that. And yes they aren't fun to tear down. I went through that when I recapped mine a few years back. BTW the auto trigger function you are seeing is the exact same way it works on my 1474. Accept that with both channels set to GND I still see a solid trace line to a adjust with regardless of the trigger knob setting. BTW I actually called the local Tektronix here to see about getting mine calibrated certified and let's just say the cost quote... was more than a more functional basic digital scope runs these days so I opted to adjust it myself as best I could and feel it is more than accurate enough for my uses.
I use scopes light this to see analog waveforms, without too much concern for accuracy. And I can also test video game boards that output XY signals.
What I've found is that 99% IPA is pants as a cleaning agent, you need significant water in your IPA to get effective cleaning. IPA is a surfactant, or wetting agent, that does the same job as soap or detergent but doesn't leave a residue. Pure soap or detergent on its own doesn't clean very well, you need water to make the cleaning process work.
That makes a lot of sense. Would you go as far as using 70% IPA?
@@artifactelectronics For internals, definitely. For my LCD monitors I prefer 50%. You just need to make sure all the water is gone before anything gets corroded. One simple trick there that I picked up in chemistry class is a dry solvent that will dissolve in water can wash water away. The high purity IPA will do this nicely, then evaporate easily. Of course, right now IPA, especially the high purity stuff, is really hard to find. If there's nothing that it will attack, high purity acetone will do the same thing. (That's what we used in chemistry class to remove water from glassware.) Just be careful about the vapor, acetone is even more volatile than IPA.
I have a Tektronix 2235 that's doing the same thing.
I have a 2246 that used to be my workhorse for many years. But it was well take care of in its previous life and still works like a champ.
ARTIFACT, Can you make a video lesson on giving a bunch of examples on what types of signals would you use for the external trigger input port?
Let's say you wanted to measure several signals on a CPU board. If you use the CPU clock signal as an external trigger you can get stable displays of every signal that is derived from the clock.
@@artifactelectronics What type of signals would be "Derived" from the clock signal?
Address, data and control signals, for example.
@@artifactelectronics Why are Address, data, control signals "referenced" to the clock signal? When measuring address signals, data signals how does an Electronic Technician know the signals are referenced to a clock signal?
@@artifactelectronics Since all the IC chips have the Enable Pin which the clock frequency is clocking in/out the data on all the IC chips. The Oscope can't AUTO trigger from the ch#1 probe when measuring data signals and address signals because of why? If you tied directly all the IC chips enable pins to +5vdc then the data signals won't be clocking data in/out of the IC chips so what will happen?
Wow nice but no fun .. we didn't get to see the guts, but then there are many fars-eners to remove...
I hear you. I'll make sure that the next one I get has an electrical fault requiring open case surgery.
An analog scope is better for looking at curve traces, as I am sure you are aware.
There are many situations for which I prefer pure analog scopes. For electrical artifacts I'll take a CRT screen over an LCD every time.
Isn't there a phase adjustment on your function generator to get the two signals in phase?
The proper way to do this is to trigger the FG with the same signal that is triggering the scope. This would sync the both signals for a stable display.
can anyone link me where to buy the input cords for this exact model
also if you can find one that has an adapter for auxiliary that'd be nice
Any standard scope probe rated at 30MHz or better from amazon or ebay will do the trick.
FOCUS!! All your vids are pretty blurry.