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Team, I have over the past few months acquired 5 7844 scopes, none of which worked. Good thing it was just the cost of picking them up. I have repaired 3 of them so far, one of them still has the power supply on the bench, one was the parts source. On the latest project a R7844, after replacing caps in the power supply, replacing beam 1 vertical amp twice, original was very noisy, first replacement gain was very compressed on the positive side. Working very well now, calibration done. Discovered one last problem. Intensified sweep using a 7B92A. Beam 1 works perfectly, beam 2 the delayed intensified sweep is very dim . Intensity control does control it but at max you can just discern on the screen. Reducing the separation until it corresponds with the main trace it works perfectly. Now for the weird part if I use the older 7B92, intensified Alt trace, it works perfectly Thoughts? Mark W7HPW Real Radios Glow in the Dark

Hi folks. I recently purchased a Tek 2247A scope and upon testing it for the first time, it locked up when testing the B sweep with a msg that said 'INVALID INTERRUPT FROM 0993:F082' When I rebooted, the screen has an indecipherable error message that appears to read something along the lines of 'Part Number 100-xxxx-00' with a bunch of exclamation marks. I couldn't clearly read what the part number as it was out of focus and could get it to focus well enough to read the numbers. The 'Auto Level' and 'Auto' LEDs were flashing which indicates both a RAM and ROM problem according to the service manual. The SGL SEQ LED was also flashing but there's nothing in the service manual that mentions that LED, or at least nothing that I've found. I let the scope sit for 10 minutes and it booted back up in service mode and gave a failed battery warning, and ran through self calibration. I left the unit on and it locked up after about 10 minutes with the same error as before. After the reboot I went into the service menu and ran the self test 'until fail' and the test ran for 30 minutes without issue. I also ran through the self calibration once more. It's now been powered on for a few hours without any problems or locking up and all functions 'seem' to be working as expected. Thoughts? Would something like this be caused by a battery issue? That seems like an easy fix but if it's something deeper, I'm not sure if I'd want to chance it. Thanks! Jay

Greetings from Louisiana! I have had several damaged shipments of the SC502, SC503, SC504 scopes. The Slope / Level switch-pot is damaged along with the knob. In a similar way the Volts/Div and Time/Div knobs were broken. In one case the shafts on all 3 knobs were broken. I decided to have shafts built in plastic and 316L Stainless steel. I took the original knob with the printed skirts and drilled out the original shaft and replace with the custom shafts I designed and had manufactured. The plastic shafts are as good as the original, and the 316L stainless steel shafts are far better than the original. I am also working on having the skirts manufactured out of 1/16" acrylic and printed with UV Ink. So now for the question(s)... 1) Does anyone have any SC502, SC503, SC504 knobs with broken shafts that need to be repaired. I can provide the shafts or repair your broken shaft. 2) Does anyone need new skirts for SC502, SC503, SC504. So far I have restored several of these scopes (more than 10). Initially I got plenty of help / suggestions from the group. Many thanks for that. Regards, Barry

I use Google Translate. I don't have brightness adjustment and the reverse path of the beam is visible on my 2337. The A15 board is defective. A15 Vertical Output / H.V. Power Supply board. When I replace it with a working one from another 2337, everything is OK. Where should I "dig"? Thanks!

Barry Breaux <groupsio@...> added the photo album SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) : If your SC503 or SC504 Volts/Div or Time/Div knob shaft was cracked or broken in shipment you can use these to replace the shaft. --- The following photos have been uploaded to the SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) photo album of the [email protected] group. * IMG_2567.JPG ( /g/TekScopes/photofromactivity?id=3909069 ) *By:* Barry Breaux <groupsio@...> --- The following photos have been uploaded to the SC503 and SC504 Volts/Div and Time/Div Knob Shaft ( /g/TekScopes/album?id=302038 ) photo album of the [email protected] group. * IMG_2570.JPG ( /g/TekScopes/photofromactivity?id=3909070 ) *By:* Barry Breaux <groupsio@...>

Is anyone else having issues with TekWiki today? I attempted to look up an instrument, but received a message stating that a login is required. I don’t have an account, so I can’t access anything past that.

hey folks I plan to open up my Tek T922 scope in the next couple days to hit all the contacts with contact cleaner & reseat the boards & connectors . It looks like 3 screws on top spine & another 3 screws lower spine . Is there any other fiddleing I need to worry about with the front or rear cover ? thanks animal

Anyone have a manual for the 1424? Wiki Down? Sam

2465B s/n 57xxx When I first powered it up, the lights would all come on for a split second, then they would go out, then it would cycle through the self-tests, failing at TEST 05, so I cleaned up the A5 corrosion and replaced a few components there. I also replaced the RIFAs on the power supply. Following that, when I turn it on, the lights all come on, but they don't go out. All J119 points are well within spec. I am a little confused at times when following the service manual, for example the troubleshooting procedure said TP201 should be +10v, but the schematic seems to indicate it should be +5v, which is what I'm getting. I'm not sure how to proceed at this point. I'd like to go as far as possible before I am forced to buy a new oscilloscope to repair this one. Thanks

<https://www.mill-max.com/products/new/zero-profile-press-fit-receptacles> Cheers, David

Found several at Mouser that I don't know which to order The specs look the same and Mouser couldn't tell me the difference CM7152 CM7153AS15 The first one is 30% cheaper.. Thoughts?

I recently acquired a TDS3054C that appears to be functional in all regards, except that I've had trouble accessing the built in web-server with modern browsers on my Windows 11 laptop or my Apple silicon (M3 Max) MacBook Pro. I've updated the firmware on the 'scope to v 4.31, the most recent available on the Tektronix website. On the Windows 11 laptop (an i7 Lenovo ideapad) recent versions of the Microsoft 'Edge' browser and the Google 'Chrome' browser simply wouldn't render the display windows served up by 'scope. Same for current Safari or Chrome browsers on my Apple silicon MacBook Pro. As a sanity check, I tried viewing the 'scope pages with Internet Explorer and Chrome browsers running on a virtual Windows XP environment (hosted with VMWare Fusion on an i7 iMac). With that setup, I could view static screen-shots of the 'scope display, and the 'scope status window. Also, I could download and upload waveform data. However, I found that the tek.com 'cgi-bin/connect' service doesn't appear to be available. After confirming that the 'scope was actually serving screen-shots and waveform data, I started looking for other 'legacy' browsers that would let me access the 'scope from the Windows 11 laptop. I found that the mypal browser (https://www.mypal-browser.org) did the trick. For accessing the 'scope from my Apple silicon MacBook Pro, the Firefox browser v129.0.2 does a great job. Now, if there was just some way to download the cgi-bin/connect scripts from www.tek.com, or the tek 'escope' site was working, I'd be a happy camper. Mark

There has been some discussion over the years as to how to disassemble the knobs for repair/cleaning. I got mine fully apart (thanks to the photos others uploaded when they got stuck) and uploaded photos. For knobs designed like mine, the black cap pops off and there is a screw underneath. Until the screw is removed, the smaller knob cannot be separated from the larger. The clipped off leads on the LED package allow testing each LED individually if desired; mine have a Vf of ~1.5v. Alternately, 7.5v across the array results in them just starting to glow. The center pin on the left of the array (as oriented in close-up) is common. It seems the transistor on the lower left pin in the array is bad, as it doesn't respond to light; the others do. Does anyone know where to find a 1x5 phototransistor array with spacing of ~1.175mm c-c? The schematics don't show much beyond the fact that the array is biased with +/-15V, and nothing shown in the opto section of the 1982 common design parts catalog looks even remotely close. Regards Mark

mark999 <mpictor@...> added the photo album Tek 7L5 resolution & frequency knob disassembly ( /g/TekScopes/album?id=301996 ) : 7L5 knob encoder disassembly

Greetings! I need to re-letter the skirts for some of my scope knobs. Has anyone done that here? I am thinking that black vinyl reversed letters on transfer stock would work. I found a few sites that provide that service, but I am not sure if they can deal with the small size that would be required. Not sure if a design tool is available online. Other suggestions are welcomed! Thanks, Barry

have a trio of Tek 453's. Two are MOD 703K and the other is MOD 703H. I have had one of the 703K's on my bench for many years. Of late, it has developed trigger issues. I can only get a stable waveform if feed it a square wave. It will not trigger on a sine wave. The other 703K triggers fine, but has a few other issues, chief among them it is missing the center control knob for the sweep control. Not just the knob, but the center shaft. Not clear what is actually missing internally since that control is fairly well buried (as is everything else on these). The 703H has many other issues, stability wise, so it may become a donor for missing knobs/controls, feet etc. Thoughts on the trigger issue?

Hi Group Members! Got a broken TM5006 Mainframe and found a few damaged parts showing a short on my Multimeter. Here the original part #, and now I’m looking for x-Types for those parts. I’d be nice if someone could give me a hint or confirm about the parts I found are fitting! 151-0632-00 some people use MJE13007, or some the MJE13009? 152-0655-00 A115AX39 ??? Can not find this type of rectifiers at all… 152-0400-00 1N4936 152-0686-00 MR821 Any help welcome! Best, Joe

I've got an SG503 on my bench that seems to be working fine on all ranges with nice leveled output, etc. However, the finger contacts under the cam switch need to be cleaned as I have to fiddle with the switch a bit to make contact at some settings. It is my understanding that the best way to clean the finger contacts is to get a piece of paper/cardstock with a bit a 99% isopropyl under the contacts and gently pull it across the contacts. For those who have done this before, my question is what is the best approach to do this with a SG503? Is there a way to do this without a major disassembly? I'm not adverse to disassembling the module but I don't wan't to overcomplicate things if I don't have to. Thanks! Jay

Hi. I've got a faulty MSO4104 here (not the B version) and it has a bit of a history. Someone at work blew up channel 1 on the 1Meg input many years ago but the scope was still useful on the other three channels (and on 50R input on channel 1). So it has been in use like this for several years. However, someone at work recently upgraded the firmware on it to V2.68 and this caused it to report a failed SPC self calibration. So it halted the SPC after a few seconds. This left the scope in a bit of a mess with lots of sampling artefacts on the traces and some trace distortion on all four channels. So it became fairly useless. I've had a look at channel 1 and restored normal operation on the 1 Meg input (a resistor was blown open circuit) and so I was hoping that it would now pass the SPC. However, it still fails although it gets a lot further into the SPC before failing. I think it might be failing on channel 3. Does anyone know what the format is for the error log file? It gives a date and some words and numbers on each line. I think there may be an issue with channel 3. I also have my own MSO4104 here to compare against. It is running V2.68 FW but it is a newer instrument. Is it possible to go backwards with the firmware to an earlier version of FW? Any other suggestions to get any meaningful debug info from it during the SPC process? Can it be logged remotely whilst doing it? I've looked through the user and service manuals for stuff about the error log but can't find anything.

no personal connection https://sacramento.craigslist.org/ele/d/sacramento-tektronix-2445b-oscilloscope/7843398888.html