开云体育

Thank you Ben for the detailed info - I really appreciate it! Here are my measurements for the reference points you listed: Junction between C369 and L369: 12.04V L343 (any side is fine for just

Thanks for the reply. Today I unsoldered about 20 chips that were near the capacitors to see if there were any interruptions in the conductor tracks. I didn't find any interruption. How do you think

- Adjusted Ch1 var and the "uncal" light is off, as I mentioned in post #207706 - The var for A & B time base is in detent, as you can see clearly in my video. That said, I cleaned the pot and it

Jeffrey, The uncal lights and x5 lights are still on. The uncal lights should turn off when you go to the detent position which you will feel. As others have said, the switch could be dirty making

Still trying to get a bit further without having to take measurements may yield more info. If both channels show the same behavior: Since bad contacts are rather frequent with old equipment like

[email protected]> wrote: If this is your first scope repair, you might want to read through this wonderful document: https://w140.com/tekwiki/images/5/5d/068-0315-00.pdf. This is from a time when

Also I doubt it's user error. Cal lights are likely from bad switch contacts as it looks like the knobs are indeed in the dented position. Sure but since OP did not mention it… Raymond

That means, no trace without beam finder unless external trigger.… No it doesn’t because auto-trigger is on… Did you try channel 2? same result? Did you play with vertical positions? Both

You can begin troubleshooting the vertical amplifier by chacking voltages at specified test points. They will tell us a lot. Go to https://w140.com/tekwiki/wiki/454 and download the 454A manual, not

Center the vertical positioning control with the sensitivity at 1 volt/cm or greater (minimizes signal pickup). ground vertical input. at the vertical deflection plates, measure the voltages.? They

Steps I did on my TDS8000, I hope it might be useful to somebody in the future: ==================== #PPC

From your settings, it’s my impression that user error still plays a role here: - Ch1 ampl. still shows “uncal”. Not a cause for no trace but you don’t seem to know it does not match what you

I shot another video to demo the current situation: https://www.youtube.com/watch?v=W_pNMTIXrTc How do I troubleshoot the vertical amplifier board?

Thank you for the info. I shot another video to demonstrate the issue. I have virtually tested all vertical and horizontal sensitivity combinations to no avail. I just realized that the UNCAL light

Hello Gianni, maybe Dorit and I can get you the paper, if it is helpful. But it will take some time. If yes, please let me know via a private email. Tam -- With best regards Tam HANNA Enjoy

Hi Anita, While you are at it, if you haven't already done them, you might want to take a look at the Tek list of "factory updates/mods" for the 575. There are a BUNCH of them. I'm wading my way

?ann mán., 23. des. 2024 kl. 03:39 skrifa?i Jeffrey Wang via groups.io <xwsunrise@...>: For most of the video your vertical sensitivity was set to 20mV/DIV, which is way too

To me it looks like the beam is being vertically deflected a lot. You mentioned yoy adjusted "position", but in your video the channel 1 vertical position is all the way counter clockwise, so the

Got a Tek 454A the other day and did a quick test. It turns out that the only way to see a trace on the screen is to hold down the “Beam Finder” switch. As soon as it was released, the trace was

Hi Barry, My comments are inline below. Ozan Noted. At -15.1V this test doesn't say much about Q8051 (output is not completely cut off even if Q8051 was fully on) but see the note below for