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I have a problem with horizontal display showing double or distorted image . It happens on both channels and I uploaded a photo in the album named : 485 Problem If anyone has seen something similar or has any suggestion, any advice would be appreciated. Thank you

I'm trying to format a MFD-2DD floppy on a 370A . press 'FAST/SHIFT' screen says... press 'SAVE' I press 'SAVE' and then the 370A displays ' FORMAT BUSY' goes about formatting the floppy 1 to 80 . The floppy drive light turns on during formatting as would be expected. When it gets to 80 , the display screen ' FORMAT ERROR. ' I have tried multiple 1.44 MB floppies as well : old ones and new ones. I bought a low density floppy from AMAZON as well with the same errors . I get the same results, 'FORMAT ERROR' once the 370A gets to track 80. Has anyone ever experienced this problem ? Is it a bad drive ? I'm new to the equipment. It was gifted to the school where I am the lab assistant. Any help would be appreciated. William Foley

Kind of an unusual request to the group. I am repairing a 300 watt stereo amplifier, and found a bunch of bad high power output transistors during the debug process. All of these transistors are no longer produced, and also the package style (MT200) is no longer being produced. I don't wish to modify the mechanical assembly to use modern replacements. I have found a source of supposedly replacement transistors which carry the same part number and package style. The problem is that many of these transistors have be "bastardized" and being sold as original spec. Many of them are not. If one had a curve tracer you could compare the so called replacement with the original type, of which I have several. My request is this. Is there anyone in this group who owns one of the Tektronix curve tracers, would be willing to run a series of tests comparing the so called replacements against the original types???? I would send the batch of transistors to you to evaluate. That would at least give me some hope that I can use somewhat original parts to facilitate the repair. I have spoken to a person who has been down this road before and they have indicated that even if I were to use the knock of type of transistor, the amplifier would probably work for a few months and probable die the same type of death. What say the assembled masses???? Regards, Karin Anne Johnson P.E. K3UU

Hi, I am trying to revive a bricked TDS540 that refuses firmware updates. There are useful troubleshooting diagrams in the TDS520 Component Level Diagnostic and Repair Manual Vol 2 available on TekWiki. I suspect that the Byte Decoder PAL U1048 is defective ( signal LLBE irregular ). The Byte Enable Decoder Troubleshooting Procedure refers to a diagnostic called cpuDRAMMem diagnostics, that is not part of this volume. The equations of the U1048 PAL are listed on " Table 6-22 ". Where can I find this information ? Are they part of a "Vol 1" ? Any help / hint is welcome ! Thanks Hans

How can I make a dual XY and time display like appears in page 11 of this issue? https://w140.com/tekwiki/images/5/55/Tekscope_1973_V5_N3_May_1973.pdf /g/TekScopes/photo/131745/3881503?p=Created%2C%2C%2C20%2C0%2C0%2C0

Hello everyone, I would like to tell you about the error. The oscilloscope can be switched on, the fan is running and the Key lighting stays on permanently. On the A11 DRAM Processor/Display Board number 8 lights up on the segment display. The device had a problem with all SMD capacitors. Then I replaced all the capacitors and cleaned all Circuit boards. Unfortunately, this action did not fix the error. I then started troubleshooting using the service instructions. Here are the links to it: Volume 1: https://w140.com/tekwiki/images/6/62/070-8312-01.pdf Volume 2: https://w140.com/tekwiki/images/4/48/070-8313-00.pdf I carried out the diagnosis on Volume 1, page 187. The fan is running and after 30 seconds the key lights doesnt turn off. Thereupon According to the instructions, I troubleshooted the processor/front panel procedure (Volume 1 page 195). I checked all the required voltages on connector J2. all OK. The clock signal (3.125Mhz) is also present. According to the instructions, the communication link between the A11 Display/processor board and the A12 front module is faulty. The A12 Front module is most likely defective and should be replaced. There are a lot of troubleshooting instructions described in volume 2 but I think Unfortunately not one applies to me. I think there are missing a few pages. I have measured the processor on the A12 board (Volume 2 page 218). Unfortunately the 3rd page is missing there. I noticed that there was no 2Khz signal on pin 2 of the processor (U1). This means there is no 1Khz square wave signal to set probe. The operating voltages are OK. The clock signal from the A11 board is also present. Does anyone have an idea what this could be? Does anyone know how I should proceed? I wish everyone a merry Christmas! Greetings from Germany Paul

Hi , new member here. And new to Tektronix scopes after just upgrading from my Tenma 20MHz to a very nice (and mostly functioning) 2465. Does anyone have a board layout for the Attenuators for the 2245 scope? Specifically, I am looking for the location of the 50 Ohm resistor inside the attenuator. I have the service manual which shows the electrical schematic for the attenuator, but I cannot locate the 50 ohm resistor on the attenuator ceramic board. My channel 1 input impedance setting works for the 1 Meg-ohm AC and DC settings, but the signal flat-lines on the 50 ohm DC setting. I suppose the problem could be the latching relay. But still, I'd like to check the resistor. Channel 2 is fine. Cheers!

I picked up a 475 at a swap meet Saturday. It needs some TLC and a new set of 4 feet. Does anyone have feet, or a recommendation where to get some? I'd be willing to cobble up something if I had an idea how.

Has anyone here ever adapted anything to replace Option 25? I have been searching for a long time, no luck in finding one. The only thing I've come up with it the right hand side of a TR502 with missing parts.

Calling Tektronix repair experts. I have a TDS340A where the ZYTEC 2291739 Power Supply literally blew/burnt like 5 component beyond recognition. A little hard work looking at a lots of post and pictures I manage to find all values except for one ZENER DIODE - VR9. Does anyone have an idea of what voltage this should be? (I assume due to the VR that it is a Zener diode).

Hello *, is there a way to the set the probe attenuation manually on that scopes which dont't have a "Probe Functions" menu like the C or D models? If there is no digital way are there any solutions on the WWW for building my own "Tekscope" connector?

In case anyone is interested, I have created artwork to replace my faded 130 L-C scale. /g/TekScopes/photo/300288/3879649 I cut a 26SWG brass backing plate, preferring to keep my original for another day.

hello friends, I need a HV transformer for a Tek 502A Part No. 120-0150-00 greetings Martin

Does anyone have a scan of "24X58/2467B GPIB (Option 10) instrument Interfacing Guide" that they can share? I've not found one on-line so far. thanks, Michael

Hello *, I just got a TDS684A. Basically everything is working but the bandwith is a too low (~800MHt). Can there anything be done to increase it?

Richard Kelly <richardjkelly@...> added the photo album 130 L-C Meter (Late model) ( /g/TekScopes/album?id=300288 ) : Photos regarding the tektronix 130 L-C Meter (late model)

Hello again Have a working Tek SA 492, SN B05 1984 , 2500 hrs. to check power supply for RIFA caps, lytic and tants, the. PSU remove procedure in manual is vague on the location of connectors before you pull it. Any tips or diagrams ? caps to replace or change ? Your thoughts and advice appreciated Many thanks Jon

I have a 455 with a defective HV Multiplier (part of U550). The TEKTRONIX specification calls for a 1 1/2 times multiplier with a "3M Series Resistance". I have built a 1 1/2 times multiplier (that is pretty simple), but am unsure of how to properly get that 3M of series resistance? If this is a simple matter of soldering a suitable sized resistor into the Anode lead? What watt rating for the resistor? I have a 3M Ohm carbon composite resistor, but it is only 1/2 watt. I'm afraid this resistor is too small to do the job. I suppose I just do not completely understand the principals involved? How to get the right answer is the bigger question? -- Michael Lynch Dardanelle, Arkansas

I need to restore my Tek 130LC meter scale - the red has unsurprisingly 95% disappeared. I've crafted the artwork, and boy did that take some time as each of the five scales is cunningly non-linear and no two appear the same! It's now about print and apply, but apply to what? I'd rather keep the original aluminium-backed scale safe as I may have a way to restore it without removing/affecting the existing visible print. What I do have to hand is plenty of suitably thin brass sheet. I'd need to buy aluminium in. Am I correct that brass is equally suitable, will have an equal impact on meter calibration/accuracy, but might possibly confer slightly more damping? However, having spent SO long producing the exact artwork, would be shame to undo that with the wrong material! I just don't have the practical experience here, so would value your thoughts. Thanks.

Hello! Sometimes ago i obtained a TDS640A Acq. board. I found on w140.com Wiki, what TDS544A uses the same Proc. board as TDS644A. And bought it too. Today i have a TDS544A Proc. which working with TDS540A Acq., but when i try to connect TDS640A Acq, processor doesn't see it and give me an error. I think, i need to flash TDS640A firmware to my Proc. board. It right? Second question: I bought a PCII/IA GRIB board to make field adjustments later. This ISA board runs on PIII with Win98SE. I thought I could flash the oscilloscope using this board, but I read that the macbook can only work normally in Win7/10. Does anyone know about Win98/DOS Tek flasher? Thanks, Peter