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The following items have been added to the Files area of the [email protected] group. * /070-6860-00.Tektronix.2465B-Operators.Manual.pdf ( /g/TekScopes/files/070-6860-00.Tektronix.2465B-Operators.Manual.pdf ) *By:* vk2bea <vk2bea@...> *Description:* 070-68860-00 2465B / 2455B / 2445B Oscilloscope - Operators manual (high quality scan with navigation links)

Hi, I could not find any explanation about how to set this semi-fixed front panel control on the 7633. Manuals say: ? FAST LEVEL CENTER adjustment is provided to separately adjust the fast mesh voltage for the desired tracking of the STORAGE LEVEL, on the two meshes. ? FAST LEVEL CENTER-Adjusts the voltage level of the FAST target relative to the viewing target and, therefore, the tracking of the STORAGE LEVEL for the two targets. But it is not clear to me how must I adjust it, besides some empirical attempts. Does someone know more?

Although not 100% accurate schematics for the TDS400 series have been posted to the files section of this group as well as TekWiki. They were scanned from "C" and "D" size engineering drawings and then converted mostly to "A" legal size. These were late pre-production drawings and did not contain the power supply (not Tek made). I did not have access to final engineering drawings. No manual was ever published by Tektronix for the TDS400 series which contained schematics or parts layout drawings or pictures. Being the first all digital oscilloscope which relied extensively on microprocessor control, it was new territory. The next series, TDS500, had manuals which were similar to past Tek manuals complete with schematics, theory of operation, and pictures. I have no background in manual writing or compiling, just a technical background working at Tektronix for about 30 years. I was able to obtain the drawings from one of the engineers who designed the TDS series, now passed on. I tried to post on TekWiki but was not savvy enough to figure out the posting process. I had sent a couple of the trigger related schematics to Tim Wright who was having triggering issues with his TDS420 in hopes it would help him find his problem. I then posted all my jpg files to the cloud and informed Tim that they were available for him to use. Kurt Rosenfeld at TekWiki has also been informed of the existence of the schematics. Both Tim and Kurt have assembled my jpg images into a single pdf file. I thank them both for doing something that I had been unable to do which resulted in my work to be available to those who may need it. The TekWiki availability is here: https://w140.com/tekwiki/wiki/TDS420 - or: https://w140.com/tekwiki/wiki/TDS460 The schematics are available in the Group files section here: /g/TekScopes/files/Tektronix%20TDS420_460%20Schematics.pdf Best regards, Ferrous Steinka

Having does the necessary restoration on my T130L-C, I am now running through the calibrations. I have an issue with the 0-3 and 0-10pF calibrations. The controls, R100 and R99 respectively., have the 'range' but it's clear that the points at which they were set have become 'burnt in' for want of a better description. At those very points where it is almost correct the control loses its authority and idle goes full scale. A spot of cleaner I figured. But no... On inspection, they both seem, uniquely amongst the rest of the pots, to be wax-sealed or similar. I'm assuming in pursuit of stability, but sadly now working against that at 50+ years on! Anyone come across this issue, and therefore recommended resolution? Before I extricate then and attempt to clean.

I know this is a long shot, but doesn't hurt to ask. I want a P11 phosphor tube for my 570/575. I know the pitfalls of them vs regular green P1/P2/P31 phosphor for day to day use, but I still want one. Can trade a working P1 tube from my 575 if you wanted a green one in exchange (slight burn in, at the bottom lower left corner where the dot must have remained idle for some time). Located in Rochester, NY.

Here’s my story, Tek 485, a ham fest purchase, it was dirty and nonfunctional. It's a pretty common issue with ham fair test equipment. After cleanup of the 485, I found it had a shorted Tant in the -15v rail, a quick fix, and it was all operational. Then a few hours later, another Tant shorted, this time it was C1748 through a small choke. The resistance was the hint, it wasn’t 0v to ground but about 0.26 ohms to ground, so I knew it wasn’t a direct to ground, this helped locate C1748. Even though now all rails are up where they should be (I won’t list them all here but they all came up fine from +-5v to +180v). However, now there’s an issue with the Z axis. I’ll try to describe it, the trace is Z axis modulated, as in a dashed line ~!~ Strangely, the frequency of dashes appears to change a bit in accord with the intensity control. If I turn the trace intensity down the trace disappears completely. Here’s the kicker: if I touch the case (Collector) of Q1772 or Q1752 as they're common, the modulation disappears and the trace looks fine and intensity has full control. There might be other issues but the trace modulation is the first I’ve ever seen and needs to be put to bed first. How do you suppose changing the brightness changes the apparent frequency of the spacing of dashes on the trace? I’ll post a short clip, let me know if it’s best here or in the files section.

Hi! I have an old Fluke 105B Scopmeter Series II. I have its serial cable, but I have the chance to access its floppy disk with the FlukeView app. Is there anybody who can help me with the app or a compatible one? Thank you!

My 2465B suffers from a miss-tracking of focus with intensity. When the intensity is turned up (75 to 100%) I have to re-adjust focus. When I do this the readout is out of focus (because it is a lower intensity). Is this a problem that can be corrected by the "High Drive Focus" adjustment or is it likely to be a component failure in the z-axis amplifier?

Hi Folks, I made a 3D printed cover for the front of my Tek 7704A. I was worried about accidentally harming the switches while I move it off/on the shelf. I could clean it up and share it but that would mean a large reprint to test it and I wanted to gauge interest before wasting that much plastic and electricity. PS: I am planning to do one for the 11801 as well. Though I will probably have to line that with copper tape or something. Evan

I have a few Tex 453 scopes. Two are oddballs in that they are MOD0703K so they differ a bit from the manuals available, although folks here pinted me at a doc that lists changes. The biggest difference is that it has the larger CRT 8x10, same as the 453A. https://w140.com/tekwiki/images/c/c1/Tek_453_703H_703K.pdf Serial numbers are prefixed with a B, e.g. B021516 and B021836. Most docs seem to indicate teh major family change was serial number >20,000. The other one is a 453 MOD0730H, serial number 0600794. Is there a "decoder ring" for Tek serial numbers correlated to date? I assume these are all non Nuvistor variants (I do not see any Nuvistors on board, but these are very dense circuit wise, and I have not really looked where all boards and devices live. One of the MOD0703K is missing the center red knob on the sweep selector. Knob is missing, along with the shaft, which appears to go very beep in to the inside. The mechanical drawings of the manuals posted on line are not very clear to show how the shaft coupled to the pot. Looks a bit different than the shaft collars with set screws that are on other pots and dials. Any insights?

The following items have been added to the Files area of the [email protected] group. * /Tektronix TDS420_460 Schematics.pdf ( /g/TekScopes/files/Tektronix%20TDS420_460%20Schematics.pdf ) *By:* Tim Wright <al7ds@...> *Description:* Factory schematics for the Tektronix TDS420/460 Digital Oscilloscope. Said to be 100% accurate with the exception of the Power Supply (Lecroy schematic of the same third party supply)

All SMD caps replaced, board cleaned and inspected, via's reflowed if showing corrosion signs. Still getting trigComparatorTest FAIL, ERROR ID 151 diagnostic test failure trigComparatorTest, TRIGA status after trigger: exp = 1, act =0. ** alpha trigger (XTRIG), on the RS232 Debug port. This tells me that there is still an open via somewhere. Since schematics appear to be un-obtanium, I am wondering if anybody with experience on these scopes can at least identify the part of the ACQ board I should look at closer under the microscope. What chips handle the triggering? should be close to the EXT trigger BNC connection on the PC, Yes? Only reason I am fooling around with repairs on this "Antique" (Not so antique as my 511A though) is for the challenge. It has become a big one. It would be great if someone, ex-Tek repair tech, had the schematics on these things, but I am not holding my breath.

I read Alan Hampel's article on restoration of the above. He asserts that "Surprisingly, electrolytics C99 (5?F) and C100 (25?F), factory originals, were installed backwards! Not surprisingly, they each had only about 10% of their rated capacitance and were very leaky". (These caps are in parallel to meter shunt resistors on 3p and 10p ranges). The original Tek schematic does not label the meter +/- but it is clear that the RED wire (sorry you need the schematic to follow this) is the +ve. I have confirmed for sure that the meter operates correctly, with circuit disconnected, when the requisite ?A are applied to the this terminal of the meter Having looked at my (original) 130, the electrolytics do indeed have their +ve going to what is declaratively the NEGATIVE of the meter as well. My S/N is 120xx Has anyone been through this restoration? I'd be comforted for someone more experienced to confirm this apparently repeated build and documentary error by Tek. Thank you.

Hello, some time ago I have acquired TDS744A in unknown condition. Whet it arrived it didn't turn on. I have checked main fuse and it was blown. I have dismantled the scope and found that power supply had catastrophic failure, specifically in section of standby power supply. Both NTCs exploded and created complete mess. I was checking what else was bad, BU508A power transistor had B-C short, CR10, CR11 diodes and VR1 zener shorted. I have cleaned all dirt and swapped blown components, including VR4 and VR5 TVS diodes and famous C17 capacitor. However power supply was still not working. Then I have been checking T3 transformer and found that it is unfortunately broken. It has inter-winding short on primary winding (using my Bob Parker ring tester). I borrowed similar scope from my friend who was kind to allow me to temporarily desolder T3 transformer from his scope and use it in mine. After the swap my power supply started to work without any problem. This confirmed that really T3 is a culprit. I have also measured inductance, good transformer had 18mH on primary winding, bad one had just 1mH. I would like to ask your help if anyone has power supply for parts and would be willing to desolder and send T3 transformer (I will cover all costs). It has label 22900937 REV M (it is small 3x3x3cm cube). I have been checking pictures on internet and the same transformer was used in several different Tektronix TDS scope power supply models, not just in TDS744A. Thank you very much. Vladimir

Been at this scope on and off for sometime. Learned a lot about Tek scopes and the 465M in particular. Initially, no trace, no +5V, no 95V. Currently have all three and the unit seems to function normally. Reading some of the circuitry wave forms, they appear close to what the manual depicts. Exercising the scope on a few pieces of gear also seems normal. Replaced CR582, Q742, C741, CR552, Q552 and VR552 and Vr553. Read out, in or out of circuit, all of the components related to the Q552, Q556, and F558 circuit. Also did the same with the Q544 and Q548 circuit as well as the VR533 area. All seemed well. My problem: The above operational status and troubleshooting was done with one lead of CR552 lifted. When I make that connection F558 blows and transistor Q552 seems to go south. VR552, VR553, CR552 and Q552 appear to come into play when the HV regulator malfunctions. Purpose being to provide over-voltage protection. Don't understand why unit performs like it does if HV regulator is bad and with CR552 lifted. In over my head on this one and not sure if the answer is right there in front of me or what. Thanks for listening. Look forward to any comments. Harrison N1FAM

Bonjour, we recieved a fine TEK 492 SA, circa 1980s..1990s, fine condition CAL in 2007. SN B055xxxx Will post photo album. Q: Do these have the notorius SMD lytics on some PCB that leak and corrode ? Which PCBs are suseptible? WTB: For nonprofit museum , restoration to original condition: Original TEK front cover small knob (intnesity, etc) complete service manual (2 vol, binders) original printed version MANY THANKS !! Have an absolutely fantastic day! Jon

I have a recently acquired 465M with option 93. I can't seem to find and info on what that option is. Does anyone here know?

I've a Tek 2465B that I recently acquired, it was described as 'no trace' and that is true, when powered up various leds flash for a bit but no trace is visible, with or without the beam finder pressed. It's a 1996 model but no surface mount caps. The first thing was to check the power supplies via the main board test point (actually a 14 pin DIL socket) J119. Measuring the voltages I get: Pin Measured Spec 1 -14.95 -15.0 2 3.940 5.0 (digital +5v) 3 -18.66 (-15v unreg) 4 10.00 10.0 5 -4.986 -5.0 6 15.01 15.0 7 0.0 0.0 (gnd) 8 87.0 87.0 9 42.47 42.4 10 0.008 (unused) 11 -8.03 -8.0 12 0.761 5.0 (analog +5v) 13 -1.365 (?) 14 -1.363 (?) So from this it looks like the +5v for digital is low, and the analog +5v is very low. Looking at the PSU boards there is no evidence of either bad/leaky caps or overheated components. Whats the next thing to test?

Cross posting from Equipment For Sale group https://test-equipment-for-sale-wanted-or-exchange.groups.io/g/main/topic/fs_tektronix_575_w_mod_122c/110600766 Clean insde & out. The selenium stack was open, I bridged it with 3A rated diodes. The variac had open windings, I replaced it with a corrrect one. Prior to me the front panel CB was replaced with a fuse holder. I replaced the handles. Otherwise stock. I ran through the calibration and most adjustments were spot on. The one picture shows the tracing of a 2N2369. There is some warmup drift, and the intensity doesn't seem as bright as I would expect. Not sure if this is a HV transformer issue or ? $250 includes manual (w/122C mod info) and cart. Local pickup preferred, I'm located in Waukesha WI 53188.

Cross posting this from the Equipment For Sale group https://test-equipment-for-sale-wanted-or-exchange.groups.io/g/main/topic/fs_tektronix_577_d1_177_w/110601072 Clean inside and out. Serial #s 577: B108477, 177: B059426 Option 10 is a 10 x 10 cm display with an extra cm L & R edges. Storage works, upper & lower. I did an "Etch-A-Sketch" in storage mode with the H & V position controls, see picture. I have not run through a calibration. Collector Supply knob is cracked. Display is a tracing of a 2N2369. Transistor fixture is not included. $550, includes 577 & 177 manuals (with Option 10 info) and cart. Local pickup preferred, I'm in Waukesha WI 53188. I can ship but will need a firm purchase commitment and time to construct a box. Shipping will be expensive!