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Hi. I have a HP54502A in fairly good condition I want to fix for my workbench. It fails on A/D test (pass D/A and rest) on CHANNEL 2 only. I have no schematics, just the SM, and if anyone knows of link to any it would be appreciated. Anyway, have anyone else successfully fixed this error before and what was it? I did see a blog online with at short in PS but ALL voltages seems OK and 5.2 adjusted according to SM. I have swapped the 2 ICs with heatsink around just to eliminate that. In lack of a schematics does anyone knows which IC is the DAC (A/D converter) so I at least can have a look around it and compare channels (CH 1 works perfect). Any hints are welcomed......... PS. the Dallas chips has been replaced before I got the scope with a DS1230Y so guess that is not the reason? I got the schematics for a 54601a is that too far off or similar in chip sets used? Cheers

Hello, I have a Tek P6248 differential probe, on which the micro wires in the head have unfortunately broken off. Unfortunately, the pinout of the wires, or the "Cinch" plug, is no longer recognizable and I haven't found anything online, even though this seems to be one of the most common problems with the probe. https://1drv.ms/f/c/a3cea52fd4e3ee5e/Ql7u49Qvpc4ggKM_AwAAAAACGN3PbgU5dBZXAw Perhaps someone here can help me. Best regards, Eric

Hi everyone, Yesterday, while working with my Tektronix 2465, I suddenly heard a strange noise from inside, followed by a very unpleasant smell. There was no smoke, and the trace was still visible on the screen. I immediately turned it off and haven’t tried powering it on since. I suspect it might be a Rifa capacitor gone bad, but I need to inspect the boards to be sure. After removing the cover, I realized that I can’t clearly see how to remove the A2 (Horizontal) and A3 (Vertical) boards. My main question is: Can I remove the A2 and A3 boards without taking out the A1 (Main Interface) board first? Or is there another trick to access them more easily? Any tips or advice from those familiar with the 2465 would be greatly appreciated! Thanks in advance!

Looking into a 465 S/N B260137 and trying to determine what seems to be causing the additional trace in background of triggered wave forms. Power supplies all look good for voltage and ripple. Suspecting trigger board but exactly unsure. Any thoughts would be welcome Added photos to album : 465 Scope with Ghost trace Craig

Hello I am at a standstill with figuring out why the CRT of my 2465A is blurry and won't focus. I purchased this unit from Government Planet last summer with the idea that I would probably have to troubleshoot it. I turned it on and it made a screeching sound and had no display. I thought the sound was coming from the fan but no it was the high voltage board. Checked the voltages on J119 and they were all good with the exception of the -15V rail which had high ripple. Decided to recap the LVPS with a kit from Condor Audio. This fixed the -15V rail. Turned it on and there was a blurry dispay but intermittent screeching from the high voltage board. Looked closer at this and discovered that the ceramic of T1970 was cracked in several places. Purchased a new high voltage board from QService and installed it. Now no screeching but the display remains blurry with the Read Out letters wider and taller than they should be and the same for the traces. I have uploaded 2 pictures to the file Amberwave 2465a that shows what I'm talking about. I checked voltages to the CRT socket at pins 8(31V), 12(-108V to -186V) and 13(-192V to -224V) and they look reasonable. DAC reference is right at 10V. When I input a signal into the scope I can just make out that it is a sign wave. I just don't know where to go from here. I have invested a lot of time and dollars in this scope to just give up. It would seem that this isn't a HV board issue as both boards gave a blurry image. Could this be the CRT tube itself or one of the IC's? I would really appreciate some guidance on where to go from here from someone more experienced with these scopes than me Rusty Hilliard W0RGH

Hello people of TekScopes, I have a Tektronix 7B92A that needs repairing. It has a very severe horizontal deflection off to the right of the display, but the sweep is also jittery and not stable. I've probed the sweep generators and I've confirmed they are not the problem as the sweep waveforms are beautiful. I'm pretty sure the problem is in schematic No. 6, the output amplifier for the plug-in. The only problem is, this part of the circuit is on a section of the A6 main board that is under the A7 logic board. Because of this I can't reach any of the points I need to test. I've tried removing the logic board and probe the A6 board that way, but that stops the plug-in from sweeping, which is useless for testing points on the output amplifier. I could just solder a tiny wire to every point I need to check and do it that way, but some of the points I need are on socketec transistors and I don't want to risk solder filling up a socket. Any tips? Benjamin

Just a quick one which might help anyone whose scope boots fine but then has no display.. Obviously there are several reasons this might happen, however whilst working on one of these last week, this problem was created by a faulty U950, Z-Axis Hybrid chip. 155-0242-00. Swapped the chip and the display came back perfectly. James

Gianni Becattini <Giovanni.becattini@...> added the photo album Bewitched voltage divider (11302) ( /g/TekScopes/album?id=300803 ) : see my emailò

--I have designed a Male to Female Extender Card designed to install between a flexible Extender cable (067-0645-02) and the Plug-in being tested. It uses a 4-pin, 0.1" pitch header on each line jumpered between pins 2 and 3 to connect through, but removable to measure current. etc. With the jumper installed pins 1 and 4 are available as test points on the line. The board is 2.5" long not including Female connector, and 4.5 inches wide to accommodate the 28-position Female connector and PCB edge fingers It will have 4 slots between the fingers in the standard keying locations for the TM500 series modules. The cost to make the board properly with hard gold over nickel fingers is more than I want to spend for the 2 boards I need ($300). If anyone else is interested in a well made pcb like this let me know. I used Sullin for my Female connector -- they are excellent. Steve

Fellow techies, I got this Email tonight. The sender is in Oregon, which means I'm not in the best position to help. Could someone a little closer to the 503 area code step up? It sounds like a good opportunity to try and make sure an estate full of test gear gets properly redistributed instead of trashed. The sender's return Email is nogreenpeppers@... Thanks! -------- Forwarded Message -------- Hi, I have no idea if you can help me or not so here goes... My name is Kristin and I am the executor of my uncle's estate. He has a significant amount of specialized electrics equipment (oscilloscopes, multimeters, and other stuff that I am not sure what it even is). I have someone that has offered to purchase the entire lot of it. However, I'm looking for someone that I can look at the stuff and give me an idea of what a good price might be. As the executor, I can pay for your time to do an assessment, if this is something that you can do. If you are interested, or know someone who might be, please let me know. By the way, I found your email by looking up the TEK Country Store. He used to go there a lot and I assume that people who are familiar with the place might know what some of this stuff is. Thanks for any help you can provide. Best, Kristin (503-840-4458)

I had one cracked knob on a 2465, so I pulled another to be able to use that pot, and the pulled one lost most of its spring clip that keeps it on the shaft of the pot. What methods are known to work well for using knobs like in my photo that have lost some of their spring clip parts? Does epoxy putty help a knob stay on? Does epoxy putty work too well and never come off? https://www.ecosensory.com/tek/tek-2465-2446-2336-knobs.jpg

Does anyone know what is going on with ko4bb,com? If you click on manuals than any link it just takes you back to the main page. Sam W3OHM

A photograph that was used for the cover of EDN magazine was posted to the Tek wiki site today. The photograph was published in November 1982 to support the introduction of the 7D20 and to reinforce the modularity of 7000 series. I apologize for the color balance. The photograph was badly faded to orange. I made a color correction but with my yellow cataract vision, I over emphasized the blue. Thank you Kurt R. for posting the photograph. https://w140.com/tekwiki/images/thumb/5/5b/EDN_ModularInst_7D20.jpg/1505px-EDN_ModularInst_7D20.jpg

Hi. Has anyone got an sma coax transfer switch for a 49x series SA. There are up to 3 in each unit depending on what options are fitted. Switches S11, 12 and 13. As far as I can tell they are all the same so any will do. All the best Nick

Hello people of TekScopes, I have a TM503 with a disintegrating handle. The blue outer sheath for the steel inner core has become brittle and ripped open. This just leaves the thin strip of rusty steel in its place, which is not exactly comfortable to hold and may give me tetanus. I often carry this unit around back and forth between school and home, so the handle is functionally important for me. I've tried various solutions such as cardboard and tape, but they always fail prematurely. Has anyone here experienced and found a solution to this problem? Thanks, Benjamin

I was going to attach screenshots from my 11801/SD-32 comparing one of Leo Bodnar's new LBE-1322 pulsers to the calibrator in the 11801. Seems I'm not allowed to do that. Don't know why or care. I'll simply state the result. My 11801 calibrator output has a 15 ps rise time averaged over >4096 measurements. I measured 19 ps for my LBE-1322. The calibrator signal proves that the head is faster than the DUT. If you have an 11801 family instrument which either has a failed or the slow revised model calibrator, this is a superb instrument. You want it! Have Fun! Reg

Anyone know if there is an equivalent for this Tek part number, listed in the TG501 parts as 'Hot Carrier, 4V' ? It's used as a frequency multiplier to generate the 1nS markers from the 2nS signal. My TG501 has working markers down to 2nS but no signal on the 1nS output, so it would appear the diode is faulty.

Greetings, What would cause this? Thank you! /g/TekScopes/photo/300558/3883505?p=Created%2C%2C%2C20%2C2%2C0%2C0

All are used. Some work, some need work, not checked in several years. Item US$ 067-0885-00 50 MHz + 30 dbm source to drive microwave comb generator,etc SN b010367 $50 7a11 Amplifier SN B082381 $40 7a11 amplifier SN b040484 $40 7a13 differential comparator SN B243884 $25 7a13 differential comparator SN B225690 $35 7a17 amplifier with the Proto board area as designrf by Tek SN B041317 $40 7A18 dual Trace base SN B118843 $20 7a18 dual Trace amplifier SN b160649 $15 7a18 dual Trace amplifier SN b110715 $25 7a18a Dual Trace amplifier Option 6 SN B011943 $30 7a21n direct access module SN b020429 $50 7a26 dual Trace amplifier SN b191049 $15 7A29 1GHz amplifier SN 100129 Guernsey UK $90 7b50a Time base B052778 $25 7b53a Dual time base B243371 $30 7b70 time base SN b152520 $30 7b70 Time base B226240 DPO-b041208 $30 7b85 delaying time base SN b088272 $20 7B92 dual time base SN b041907 $40 7d11 digital delay SN b113139 $49 7d13 digital multimeter SN b051601 other has four pin probe Lemo Jack $30 7K11 broadband .89 GHz preamplifier 30 to 890 MHz SN b030653 $80 7m13 read out unit no SN tag $95 7S11 sampling unit SN b149244 $40 7S11 sampling unit SN b124351 $40 7S11 sampling unit SN b135366 $50 7S11 sampling unit SN b148430 $65 S-3a sampling head SN B074046 with cable and probe, DL502 digital latch SN b010148 7T11 sampling sweep unit SN B201915 $150 7T11 sampling sweep unit SN B212039 $125 WR501 word recognizer delay module SN b021094 $95 Shipping $15 per plugin to USA zipcodes. Items ship from Allen, TX USA PayPal or Zelle for payment Shipping to Canada OK at cost if you contact Canadian Customs for import documentation and process it. For other international inquire by PM offlist. All items, as-is. Many were purchased as working, some in need of the proverbial knobs. INQUIRIES by P.M. offlist, photos available. Thanks, Ron

Greetings! I am working on restoring an SC504. It is cosmetically perfect, but has other issues. Channel selection is not working. Channel 2 is always selected. The vertical positioning is also not working. I have experienced different symptoms over the last few days. Channel 1 would move both traces while Channel 2 functioned properly. At this moment Channel 2 is displayed regardless of the channel selector. Channel 1 is not displaying at all. Any ideas?