hybridfree/eevblog-posts huggingface dataset:
Tektronix TDS7104 Sdram Memory Modules - Page 1
Forum section: electronics / repair

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 30, 2019, 03:20:27 pm
content: I have my TDS7104 open for Cmos battery change, what a PITA, I want to upgrade memory amount but I am confused about specs of modules.I have done this in another unit a few years back and can't remember what I learned.Some modules only show half of installed memory if they are wrong type.The present memory (in Pic)is marked NEC PC100-322-620 168 Pin.I have found PC100-222-620 256MB memory module that looks similar with that space between Ram chips.But will this work?

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 30, 2019, 05:32:31 pm
content: I think I am OK.Found Datasheet for Infinion memory showing only difference between numbering is MHz speed.

author: Jwalling
author_rank: Unknown
timestamp: December 31, 2019, 10:02:31 am
content: 256MB memory modules must have 16 chips on them to be compatible.

author: Johnny10
author_rank: Frequent Contributor
timestamp: December 31, 2019, 01:30:59 pm
content: Thanks JwallingI ordered two 256MB modules with 8 chips each side.

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 08, 2020, 01:32:40 am
content: Got my new chips and all is fine.I now have 512MB main memory on 440BLX board.Now I am wondering what TDS7104 Series Oscilloscopes think of adding memory to PPC board?Does it make any difference?

author: Jwalling
author_rank: Unknown
timestamp: January 08, 2020, 01:33:48 pm
content: Quote from: Johnny10 on January 08, 2020, 01:32:40 amIt won't make a difference.

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 08, 2020, 02:14:15 pm
content: Thanks Jwalling for sharing your knowledge of this scope.
Tektronix TDS7104 - Page 1
Forum section: electronics / repair

author: Yerffoeg
author_rank: Newbie
timestamp: August 10, 2023, 12:11:25 pm
content: Looking for some help with a late Tek TDS7104. It died last year while I was using it. The Dallas ram battery finally discharged. So it now hangs trying to load the scope application. I have fitted a new battery module but looking at the debug output it tells me the boot file is corrupt. Nothing new there. However during the boot it gives me a count down from 7 to hit any key to stop auto-boot. Nothing I do will stop the boot process which eventually just cycles round. My RS232 key input goes to the MAX232CPE on the Power PC and comes out of pin 9 on the chip as TTL. Is there something I am missing. (No not buy a new scope)

author: coromonadalix
author_rank: Super Contributor
timestamp: August 10, 2023, 05:40:53 pm
content: you should have searched the forum here before postingthere is some dedicated thread for tds7k serieshttps://www.eevblog.com/forum/testgear/tek-csa7404-repair-project/ask a mod to move your thread there ...

author: Yerffoeg
author_rank: Newbie
timestamp: August 10, 2023, 08:59:10 pm
content: Thanks. New here. Did not want to use someonelses topic but I can now see you are correct.Can someone move this to the TDS7K section pls?
Tektronix TDS744A trigger level encoder replacement - Page 1
Forum section: electronics / repair

author: the_fpga_stig
author_rank: Newbie
timestamp: September 07, 2022, 03:26:58 pm
content: I recently acquired a TDS744A in very good condition and recently calibrated.The only problem is a broken trigger level encoder (probably knocked by someone).I want to replace the encoder, but I can't find the part number of it. I also don't want to disassemble the broken one because it still works (a royal pain, but works).Does anyone knows where I can find the part number? The service manual only lists the entire front panel assembly.Cheers!
Tektronix TDS754A Error? - Page 1
Forum section: electronics / repair

author: sampler1
author_rank: Regular Contributor
timestamp: March 16, 2020, 03:27:03 am
content: Hi,I picked up a Tektronix TDS754A and the first thing I did was to run the self tests. All seems quite good but I get this one error message;error cal meas clipped at min dig ou (0@B0010: -5.119 divsWould anyone have an idea what this message is? I was told when I bought that the acquisition board should be recapped..Any ideas at all would be greatly appreciated.Best regardsGarry

author: ArcticGeek
author_rank: Regular Contributor
timestamp: March 17, 2020, 12:46:58 am
content: I doubt that recapping the Acquisition board will help much. While it is true that Tek had serious problems with caps leaking on early TDSXXX units like the TDS520A, 544A, 644A, and the like, the newer units didn't really have that many issues. I assume this is because the quality of the caps improved by the time the newer units came along.Do you get this error during the self test or during SPC calibration? The reason I ask is that this error is common when running SPC - this is usually fixed by replacing the relays of the attenuator hybrid. I haven't seen this during diagnostics, but I suppose it is still possible.One thing that would be helpful is to attach a console port to the main board when you boot up and when running diags and/or SPC. This will spew out errors when it encounters them and that is usually a good clue. At the very list it may help to determine which channel is having issues.

author: james_s
author_rank: Super Contributor
timestamp: March 17, 2020, 04:35:03 am
content: I would certainly start by taking a close look at the boards, if you see dull corroded solder at any of the SMT electrolytic capacitors then they are leaking. Leaking caps are the most common cause of faults like this, none of the models that use them are immune.
Tektronix TDS754C digDataFormatDiag error and option 2M - Page 1
Forum section: electronics / repair

author: hackwell
author_rank: Contributor
timestamp: April 29, 2020, 09:24:50 pm
content: Hi,this post is to share some intersting things I found while repairing my TDS754C ACQ board.It was showing digDataFormatDiag errors which means there was some defective SRAM in the ACQ memory.The error from the console port looks like this :ERRORID: 162 diagnostic test failure digDataFormatDiag1MMemERROR!!in demux 199 ,i= 6 memBaseAdr 0x734000e= data = 300, expectedData= 5500the DMUX numbering and addresses are :demux 198 : U400 base address 7300000 memory chips U401 to U416demux 199 : U300 base address 7340000 memory chips U301 to U316demux 200 : U200 base address 7380000 memory chips U201 to U216demux 201 : U100 base address 73C0000 memory chips U101 to U116The i = x (where x = 0 to 15 in decimal) is very interesting. It tells you which chip is bad by adding 1 to it.ex : i = 6 points to U307 chip in the line aboveor you can as well divide by 2 the least significant byte of the given memBaseAdrex 0x0e / 2 = 7 -> U307The test routine writes 2 bytes to each memory chip the reads back the result. The expectedDataword changes for each tested chip.I've noticed 0x0 , 0x08001 , 0xFF00 , 0x0a00 , 0x5500 and 0xFF00. Not very useful though.Another very intersting thing I found is the digDataFormatDiag error itselfit comes in to flavors : digDataFormatDiag1MMem and digDataFormatDiag2MMem depending on the size of the total ACQ memory.My board has 512 Ko but some board have 1 Mo or 2Mo depending on the version and revision I guess.This is about options 1M and 2M.the size of the ACQ memory is detected by the power up routine at the beginning:Limit to 1GS/sec presenceOpt Math Package presenceOpt Telecom Masks presenceOpt 3C presenceOpt 4C presenceOpt RS232/ Cent presenceOpt 1M presenceOpt 2M presenceAcq Intlv Cal Id presenceOpt TvTrig presenceOpt TvTrig indexand set automatically regardless of the NVSRAM contents. So if you enable option 2M via GPIB and if your board has only 512Mo it'll be ignored.I noticed this when I replaced the memories in channel 1 . The 2M option appeared in the banner and I got an error in channel 2 which I knew was working so far.I don't know how this happened exactly but it was caused by a bad brand new chip in channel 1.Hope this helps

author: alessandrocorv
author_rank: Newbie
timestamp: December 02, 2024, 08:13:28 am
content: Hi hackwell, your post is extremely helpful but I have the following error:digDataFormatDiag, ERROR!!BYTE mode, in demux 199 ,i= 22 memBaseAdr 0x734002e= data = 7c00, expectedData= 7800"but no there is a U323 chip in the memories.how can I figure out who is causing the error?Thank youAlessandro
Tektronix TDS784A - acquisition borard test Fail - Page 1
Forum section: electronics / repair

author: Mgelderland
author_rank: Newbie
timestamp: January 21, 2025, 01:42:11 pm
content: Hi all.I have a TDS 784A with a problem and I hope someone can point me in the right direction where to start to solve the problem. The error is as follows(digPixelatorConf ............... ***FAIL***..error details:ERRORID: 153 diagnostic test failure for DEMUX ABad pixelation, 2 errorsERR, in pixelator, pipeB, demux 198ERRORID: 153 diagnostic test failure **Error count in 1 pu_diag seq passes:ERRORID: 153 diagnostic test failure .. 1 = AcquisitionERRORID: 153 diagnostic test failure thermistor = 107)I welcome any input

author: m k
author_rank: Super Contributor
timestamp: January 24, 2025, 05:56:06 pm
content: First part seems to be a bit misleading.DEMUX A can be the same for many things.Second part thermistor then being one of those the DEMUX A is demuxing and showing a value out of range, high or low.

author: Mgelderland
author_rank: Newbie
timestamp: January 24, 2025, 10:12:12 pm
content: thanks for your answer.at first glance i don't see anything special and everything seems to work fine. regarding the alarm (thermistor) i only get to see it when i put the dipswitch on extended error report.

author: m k
author_rank: Super Contributor
timestamp: January 26, 2025, 05:03:38 pm
content: So it's possible that the machine has another thermistor or several that can vote the erroring one to be problematic by itself.
Tektronix TDS784D - Page 1
Forum section: electronics / repair

author: tektronixman
author_rank: Newbie
timestamp: April 04, 2023, 12:24:54 pm
content: Well here we go again another faulty one. This one has the usual acquisition failure on start up but the fault is strange. Ch2 seems not to be working at all just noise until I select a timebase of 12.5 or 25ns . The signal path test takes about 20mins to run and ends with faults All the four traces are vertically misplaced from there associated curser numbers Has anybody seen this before and any suggestions of where to start looking
Tektronix TekProbe BNC Level 2 Spring Contacts Replacements - Page 1
Forum section: electronics / repair

author: calibrationfixture
author_rank: Regular Contributor
timestamp: May 19, 2024, 06:33:56 am
content: Hi to All,I am searching direct replacements for the Spring Contacts on TekProbe BNC Level 2 Connectors used on P6231, P6243, P6245 e.a. Active Probes. Defective Probes are a source, but on eBay I saw:https://www.ebay.com/itm/375279376433For your reference:https://www.tek.com/en/support/faqs/what-tekprobe-interfacehttps://w140.com/tekwiki/wiki/Tekprobe_BNC_connectorAnybody?Calibrationfixture

author: pac1085
author_rank: Regular Contributor
timestamp: June 16, 2025, 06:13:06 pm
content: Working on this myself. I picked up a P5210 differential probe that had some pins broken off inside of it. I can't think of any way to get them out, let alone find loose replacements. I ended up buying a 012-1605-00 Tekprobe BNC cable to salvage parts from. It's not here yet but I think it will do the trick. The video clamp was another option to salvage the pins from, but I'm glad I bought this other cable assembly in case I end up having to swap the whole connector. your ebay link doesn't work due to the age of the post, did you manage to find loose pins?

author: calibrationfixture
author_rank: Regular Contributor
timestamp: June 17, 2025, 06:22:50 am
content: Hi pac1085,I didn't find suitable replacements and yes you can cannibalize the 013-0278-00 Video Display Clamp and 012-1605-00 Interface Cable for these. By the way the 012-1605-01 Version has less Pins. There is also a 012-1372-00 Predecessor (OCP5002/ORS2488 Accessory).Calibrationfixture

author: pac1085
author_rank: Regular Contributor
timestamp: June 17, 2025, 02:12:02 pm
content: Oh no, looks like I actually bought an 012-1605-01. It’s not here yet. That’s a bummer because it’s looking like I’m going to need to salvage the entire black piece with the 7 pins from the donor connector. Two of the pogo pins are broken off deep inside the p5210 and I can’t figure out any way to remove them. Thank you for the infoedit: managed to extract the broken pogo pins, so good to go.
Tektronix THS710 Cal Error - Page 1
Forum section: electronics / repair

author: giovannirat
author_rank: Regular Contributor
timestamp: June 23, 2019, 04:23:54 pm
content: Due to a higher offset in both of the channels (which I could not eliminate with SPC) I tried to calibrate the oscilloscope part as described in the service manual.But the first step (with a square wave signal of 1kHz with 300mVpp) did already not pass.In the error log of the scope there were a lot of failures visible afterwards (nvram error, etc..).Also in the start menu is a "Cal initialization" failure visible now (was not the case before calibration), followed by "Consult service manual...". But in the sevice manual there is no failure description available.The scope seems working correctly, also the SPC works, but calibration is not possible..My only assumptions is that the flash memory (U1 ?) is corrupted......Any other idea?Is it possible to change the flash memory and copy the content to a new flash memory?Any information welcome.....Thank you very much
Tektronix THS710 strange issue - Page 1
Forum section: electronics / repair

author: kontour
author_rank: Newbie
timestamp: September 27, 2025, 12:59:22 pm
content: Got a bit excited on EBay and overpaid for a “parts or not working” THS710 scope and now find myself completely out of my depth.Upon receiving the scope I found the battery pack itself was quite corroded so removed that and thankfully doesn’t look like the corrosion did any damage.Plugged it in to the bench supply through the barrel jack and gave it 12V, it instantly started drawing 420ma. Buttons on the front panel do nothing and no change to amp draw when I push any of them.Pulled the unit apart and found the multimeter input jacks disconnected internally as well as the SMD caps in the PS section replaced with standard can types. No other damage that I can see. Checked for shorts to ground and couldn’t find any in the PS section.Spent a couple of hours poking around and found a few of the wires to the inverter board have been crushed however still have continuity, and aren’t shorted. Also discovered that after plugging everything back in the LCD backlight now worked however is very dim. Still nothing on the screen but the unit was now only drawing 120ma. Shorted the power on pins and no change to screen or power draw.Using the basic isopropyl spray test I can’t find anything that’s getting abnormally hot on the board either.Unplug everything and the main board draws no current at all so I don’t suspect a short on there.Without schematics I’m at a bit of a loss as to where to even start with this and if it’s even repairable, given the backlight powers on straight away and the buttons don’t do anything I’m beginning to think it possibly has a bad CPU or some other fatal failure.Anyone have any advice as to where I should start?

author: Jim Narem
author_rank: Contributor
timestamp: September 29, 2025, 02:23:37 am
content: Start with checking out the TekWiki THS720 article, that has most of the diagrams for the THS series (https://w140.com/tekwiki/wiki/THS720). Unfortunately if someone has already replaced some of the power supply caps, they've probably left you with a bigger problem.

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 29, 2025, 04:33:08 am
content: You can find schematics here:https://w140.com/tekwiki/wiki/THS710
Tektronix THS720 (NOT THS720A) power supply issues - Page 1
Forum section: electronics / repair

author: JdTech47
author_rank: Newbie
timestamp: April 29, 2021, 03:02:19 am
content: Hello,I have an Tektronix THS720 (NOT THS720A) with power supply issues. I found the links the the THS720A schematic but my THS720 seems to be a bit different. Anyone know if the THS720 schematic available?Thanks!
Tektronix TLA 704 714 715 711 720 721 plugin module latching tab - Page 1
Forum section: electronics / repair

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: March 20, 2024, 02:32:02 pm
content: Hi, does anybody know if there is ready 3D print model of the latching tab for TLA logic analyzer modules somewhere there.I broke both of mine trying to slot module in my frame and they are not used often but you need them to seat the module properly in the frame.
Tektronix TLA5204B boot error 3 long beeps - Page 1
Forum section: electronics / repair

author: Zigortxu
author_rank: Contributor
timestamp: September 29, 2021, 08:47:34 am
content: Hello,I have a tektronix TLA5204B, I have not used it in 2 years and now when I connect it, the instrument emits 3 long beeps but no appers nothing in the screen and only work the fans.It makes the 3 beeps as soon as I press the button, and the button is in red.Anybody know which is the problem? and how to solve it?I hope anybody could help me.Thanks very muchSorry for my englishZigor

author: RomDump
author_rank: Regular Contributor
timestamp: September 29, 2021, 11:54:34 am
content: CMOS battery is probably dead. Plug in an external monitor.There is YouTube similar to your problem:https://youtu.be/ir8ijmDURv4

author: Zigortxu
author_rank: Contributor
timestamp: September 29, 2021, 06:07:09 pm
content: Hello,Today I have connect a keyboard, a mouse and an external monitor and now works fine. I dont know why but it works well.Thanks very muchZigor
tektronix TPS2000 BNC replacement kit - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: September 28, 2020, 06:40:35 am
content: Hi Alllooking for tektronix 050-3598-00 bnc replacement kit for TPS 2000 SCope . as it is discontinued not availableAny alternate solution ?Thanks in advance

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: September 30, 2020, 02:22:37 am
content: Do you know if it is the same as used in tds210/20. If so, I have a handfulEdit: I just saw a picture of the acquisition board and they don't look the same.

author: bdunham7
author_rank: Super Contributor
timestamp: September 30, 2020, 03:40:40 am
content: I believe the insulated shells may be the same as in the kit for the TPS2000B series, 050374800. I have not been able to confirm that yet. I've been putting off buying a set so if they are now unobtanium, that's not good.

author: hitecelec
author_rank: Regular Contributor
timestamp: October 22, 2020, 06:19:16 am
content: thanksno. they are insulated.
Tektronix TR210 Curve Tracer - Page 1
Forum section: electronics / repair

author: feridunb93
author_rank: Newbie
timestamp: May 14, 2025, 12:19:42 am
content: Hello everybody , I bought a second hand Tektronix Tr-210. It is in very bad condition and is not working at the moment. The seller tried to repair it but made the situation worse. It does not have a T101 transformer. I want to have this transformer rebuilt but I could not find any information about it. In some documents, only the DC resistances of the primary and skonder ends are specified for transformers. For example, in the 2000 model, the primary is 1 ohm and the secondary is 4,2,27,178 ohms respectively. I think my device is the same, but how important are these values? If I rewind a transformer and for example it corresponds to 100 ohms instead of 178 ohms, what happens? I am having difficulty finding the transformer. I can more or less guess the primary voltage, I think it is around 10vpp, but what should be the power of the transformer, is also important, 1 watt or 5 watts? Can you help me with this?Transformer(06-6080)

author: squadchannel
author_rank: Frequent Contributor
timestamp: May 14, 2025, 03:42:08 am
content: from the schematic, it appears to be a simple transformer with single secondary tap.I think a common 15V transformer can be used.for typical E core transformer, the output power ratings can be inferred from the size.
Tektronix TSG 601 SRAM fault - Page 1
Forum section: electronics / repair

author: TEKhacker
author_rank: Newbie
timestamp: October 16, 2023, 03:57:11 pm
content: Hi All,I have a Tektronix TSG 601 Serial Digital Generator which does not function, I have managed to get it to power up but there is an error message "Faulty SRAM"Has anyone repaired one of these devices and could they suggest a repair path?Many thanks TH.

author: fzabkar
author_rank: Super Contributor
timestamp: October 16, 2023, 08:53:19 pm
content: Service manual:https://elektrotanya.com/tektronix_tsg601_digital_picture_serial_generator.pdf/download.htmlA1U21156–6794–00 IC,MEMORY:CMOS,SRAM;32K X 8,15NS,5C2568,SOJ28.300 TK2519AS7C256–15JCA1U26156–6794–00 IC,MEMORY:CMOS,SRAM;32K X 8,15NS,5C2568,SOJ28.300 TK2519AS7C256–15JC

author: TEKhacker
author_rank: Newbie
timestamp: October 23, 2023, 08:25:42 am
content: Thanks fzabkar for the links,
Tektronix TX1 / Fluke 183 need dump - Page 1
Forum section: electronics / repair

author: DK ekectro
author_rank: Contributor
timestamp: April 25, 2022, 09:45:55 am
content: Hello everyone!I bought a used Tektronix TX1 with a problem ... It needs calibration ... The instrument normally works but there are deviations when measuring AC and DC voltage, when measuring resistance it is within normal limits. As far as I researched the only way calibration is possible is through a computer and infrared port ... Since I don't have the proper equipment for the job I would ask if anyone might have a valid dump file for Tektronix TX1 or Fluke 183 ... Thanks everyone in advance

author: giosif
author_rank: Frequent Contributor
timestamp: April 25, 2022, 11:00:32 am
content: I suggest looking here:https://www.eevblog.com/forum/testgear/fluke-185-review/msg3643726/#msg3643726

author: DK ekectro
author_rank: Contributor
timestamp: April 25, 2022, 11:43:52 am
content: Thanks for the answer, but unfortunately I couldn't find on any link that someone offers a ready-made dump file for Tektronix TX1 or Fluke 183 ... Maybe I missed something somewhere ...?

author: giosif
author_rank: Frequent Contributor
timestamp: April 25, 2022, 11:47:19 am
content: Look again, towards the bottom of that particular message (there's a file attached named Fluke_183_original_working_dump_25LC160.hex).

author: DK ekectro
author_rank: Contributor
timestamp: April 25, 2022, 11:48:48 am
content: Great apology, I found a dump in the topic you suggested to me. Big thanks!!!

author: giosif
author_rank: Frequent Contributor
timestamp: April 25, 2022, 11:56:38 am
content: No worries and good luck!That fixed my "No Cal" message issue.And, yeah, there is currently no info available on the commands to calibrate these meters.

author: DK ekectro
author_rank: Contributor
timestamp: April 25, 2022, 01:42:56 pm
content: Just to thank you because I finally solved the "UNCAL" problem, before the readings of AC DC voltages were in the deviation of about 500mV and now about 100mV. if I take into account that the factory itself is not as accurate as the slightly stronger Tektronix TX3 / Fluke 185 model, then I am satisfied. Only if someone knows where I could get a well-preserved case for Fluke 183 or 185 because that TX1 I bought is in a very bad condition ...? Thanks again!
Tektronix Type 106 rebuild - Page 1
Forum section: electronics / repair

author: Zenwizard
author_rank: Regular Contributor
timestamp: August 28, 2020, 12:31:57 am
content: I am rebuilding a Tektronix type 106 and I am hoping to change out the jacks from GR874 to BNC. I have a plan for the high amplitude output but I am hoping to convert the fast rise and fall outputs as well does any one have recommendations as to how this can be done?

author: George Edmonds
author_rank: Frequent Contributor
timestamp: August 28, 2020, 01:20:33 am
content: HiPersonally I would not disturb the existing connectors, just use GR874 to BNC adapters, much safer than changing themGeorge G6HIG Dover UK
Tektronix VM700T option codes - Page 1
Forum section: electronics / repair

author: tektronixman
author_rank: Newbie
timestamp: March 04, 2023, 09:10:59 pm
content: Does anybody know how to generate the three groups of four numbers xxxx xxxx xxxx option codes to re activate the vm700t after an nvram reset has been applied .There is no sticker on the back

author: danpoarch
author_rank: Newbie
timestamp: January 24, 2024, 08:32:24 pm
content: I wanted to ask you why you had to reset the firmware? Were you replacing a CMOS battery? I might be diving into one of these at some point and I'm interested to know how you ended up in this situation.

author: danpoarch
author_rank: Newbie
timestamp: January 24, 2024, 08:47:03 pm
content: I found this in a photo on the internet. I assume that this only enables the options on this unit.
Tektronix VM700T options enable - Page 1
Forum section: electronics / repair

author: JimS
author_rank: Contributor
timestamp: September 05, 2021, 08:41:07 am
content: I repaired a VM700T and need to re-enter the code to enable it's options.One manual says to look on the back for a sticker, unfortunately there is no sticker on this VM.I contacted Tektronix and they no longer have the computer/software to recreate the option key.The code looks to be 3 sets of 4 digits, xxxx-xxxx-xxxxI have enabled options on a upgraded TDS754D -> TDS784D scope.Does anyone know of a way to enable options on a VM700T?Thanks

author: tektronixman
author_rank: Newbie
timestamp: March 04, 2023, 08:59:46 pm
content: Hi Jim I have the same problem did you ever find out how to get the option codesRegards Colin
Tektronix WFM 1761 - Page 1
Forum section: electronics / repair

author: PaulG1
author_rank: Newbie
timestamp: February 22, 2025, 02:03:53 pm
content: Hello,could anyone help? I have a Tektronix WFM 1761 with an odd problem. The on screen menu has disappeared. The waveforms display fine.When switching on the unit, there are a couple of dots which appear on the screen and within a few second they slowly drift off to the top rhs side. Pretty sure these are whats left of the on screen menu display.Anyone had this? any help appreciated.ThanksPaul , UK
Tektronix WFM601i Calibration Software? - Page 1
Forum section: electronics / repair

author: TEKhacker
author_rank: Newbie
timestamp: October 30, 2023, 10:31:42 am
content: I am looking for a source of the Calibration Software (cal.exe & .prc files) for a Tektronix WFM601i waveform monitor.I have the Cal.exe for the WFM601A, E, M series but it does not work with the 601i model.Thanks

author: Swake
author_rank: Frequent Contributor
timestamp: November 01, 2023, 06:12:19 pm
content: On the Tek site apparently:Where can I get the WFM601i calibration software?https://www.tek.com/en/support/faqs/where-can-i-get-wfm601i-calibration-software

author: coromonadalix
author_rank: Super Contributor
timestamp: November 02, 2023, 12:14:24 am
content: this is a dud there is no download link
Tektronix WFM601i Power Supply Repair - With pictures - Page 1
Forum section: electronics / repair

author: TEKhacker
author_rank: Newbie
timestamp: October 27, 2023, 09:09:58 pm
content: I have just fixed a Tektronix WFM601i Standard Definition Digital Waveform Monitor, fault was no power.Initial inspection revealed a sticky substance that had removed some of the coating over the tracks, under a 5v output capacitor, these capacitors were changed but still no power.Power input resister was very burnt, according to the diagram it should be 3 ohms, on test it was nearly 3k ohms, resister replaced still no power.I worked through the Service Manual section on power supply all as it should be.With the device on an isolating transformer I carefully checked the operation of the UC3842 controller chip.It was working fine, the 16v supply would fire up the chip, run for a short time then shut down as the supply dropped to 10v, this is how it should be.With a scope probe on the UC3842 pin 8 (+5V OP) as the positive trigger and another probe on pin 3, I could see the shutdown logic switching correctly, with the power on button latching the output on & off. Pin 4 the timing pin had a good sawtooth but there were no drive pulse on the output pin 6. My attention focused on pin 2 the Error Voltage, this should be 2.5v, it was over 3v, this will force the output drive off.The error voltage comes from the transistor side of the feedback optocoupler, the collector is at +5v Primary.Looking carefully I could see green slime creating a path between collector & emitter of about 2k2 ohms, this is enough to raise the error voltage above the operating point.With the optocoupler removed, cleaned and re-installed the power supply sprung into life.The +11v & -11v were a bit noisy, causing the menu overlay display to jitter, new capacitors fixed them.I don't know what the green slime was, I suspect it came from a leaking capacitor, the optocoupler is at the bottom of the board so it may have just drained there?
Tektronix 1225 keypad - Page 1
Forum section: electronics / repair

author: Floopy
author_rank: Regular Contributor
timestamp: April 27, 2019, 09:10:53 pm
content: I have a tektronix 1225 logic analyzer. I like it, but the keypad is driving me insane. It seems to have extreme bouncing on the switches. When I press them it will register as pressed twice or three times.I took the keypad assembly apart and started probing around. See the picture for reference: the first ones are the output to the I/O board and the second one is the switch and the output of the Schmidt trigger along with a good switch.On top of that I took one apart and the switch jumped out and decided to hide. I think that I should replace these switches. I don't know where to find replacements though. Anyone would know?

author: Floopy
author_rank: Regular Contributor
timestamp: April 27, 2019, 09:13:18 pm
content: I'm currently looking, but finding the right switch on mouser is like trying to find needle in a hay field.
Telecom Aust, 807 SI/501 STC pushbutton phone 1985. wire colour code ?  - Page 1
Forum section: electronics / repair

author: wilfred
author_rank: Super Contributor
timestamp: July 03, 2025, 06:57:58 am
content: I found this old phone with the cable cut. I want to connect in to my NBN modem. My other phone has a two wire connector green and red, But this one has a 3-wire cable with colours red yellow blue. The other phone is a Tandy/Radio Shack one, not a lot younger, that also had a hard wired old style Telecom wall plug that I had to splice a new end onto but it was easy because the number and colour of the wires matched.My question is firstly can it work? It doesn't seem old enough to have pulse dialing. Mostly I say that because it is a push button and not rotary dial unit. There is no pulse/tone switch. And secondly which two wires do I connect to?I'm hoping I can just install a double ended RJ11 type green/red two wire cable but the socket in the phone has 4 connectors.Thanks.
telecom DC power supply connector - Page 1
Forum section: electronics / repair

author: oliver602
author_rank: Regular Contributor
timestamp: November 13, 2022, 12:25:57 pm
content: Does anybody know what connector this is?

author: ingalopez
author_rank: Contributor
timestamp: November 14, 2022, 08:50:49 pm
content: Did you investigate that REMA brand?Otherwise, it may be a propietrary type connector, not unfrequent in Emerson products, and the like

author: oliver602
author_rank: Regular Contributor
timestamp: November 15, 2022, 12:46:56 am
content: I had a look at the datasheets on their website and I didn't find anything. Perhaps it is proprietary. I think a 5mm pin goes into the socket.

author: fzabkar
author_rank: Super Contributor
timestamp: November 15, 2022, 01:48:32 am
content: I found the patent:https://register.dpma.de/DPMAregister/pat/PatSchrifteneinsicht?docId=DE000019950084C1&page=1&dpi=300&lang=en&full=truehttps://register.dpma.de/DPMAregister/pat/register?AKZ=199500843&CURSOR=44
Teledyne Lecroy Wave Runner (M)Xi-(A) (i945+PC104 black case)  BIOS NEED!! - Page 1
Forum section: electronics / repair

author: smaultre
author_rank: Regular Contributor
timestamp: April 30, 2021, 01:31:07 pm
content: Need BIOS dump, and photos of jumpers settings and rear side of the board.My-one have a strange soldered "wire-jumper" on the rear side, near the ATX connetor.
TELEVISORES SONY KDL32CX527 Y OTROS - Page 1
Forum section: electronics / repair

author: quinoara
author_rank: Contributor
timestamp: September 11, 2019, 01:59:51 am
content: Señores del foro, pregunto alguien a investigado como deshabilitar las protecciones que genera la main board mostrando un codigo de error ; que se presentan en los televisores LCD de sony por ejemplo el KDL40cx527 etc..etc. Saludos

author: bsfeechannel
author_rank: Super Contributor
timestamp: September 11, 2019, 02:06:15 am
content: ¿Qué?
Telling when an Li battery in an old phone needs replacing - Page 1
Forum section: electronics / repair

author: Infraviolet
author_rank: Super Contributor
timestamp: December 20, 2022, 07:47:28 pm
content: I have an old phone with a removable battery for which had been able to get a replacement copy. The phone's battery life today is much shorter than when new, and the battery must have eben through >1000 charge cycles in its life, I'm trying to work out when I should swap to the spare battery though. The battery is a dumb, or mostly dumb, type with 3 pins (+V, Gnd and one which I think is temperature sensing), the phone itself contains all the charging controlling chips. Are there any multimeter tests I could make of the battery which would determine when it is time to swap the old one for new? Or should I just keep using it until it won't charge at all (I've seen that happen to a laptop battery many years ago). Do phone batteries ever spontaneously ignite just from age *there's no swelling or mechanical damage or anything like that involved in this matter), would it therefore be wise to swap over to the new battery soon and dispose of the old (but semi-working) one ASAP? The new one appears genuine and seems to take charge fine turing some test runs, but I can't be 100% sure about it. I do not have any kind of specialised internal resistance meter or milliohm-meter, except to the extent that such could be formed by building up other circuits to feed signals/voltages to a mutlimeter or oscilloscope.Thanks

author: RoGeorge
author_rank: Super Contributor
timestamp: December 20, 2022, 08:28:16 pm
content: - A swollen battery is a good sign to replace it.- Phone batteries won't stop taking charge like a laptop battery.- Old phones batteries do not spontaneous combust or explode, never seen or heard of such failure mode.- There is no test to make other then measuring the battery capacity and compare that with the original.- As long as you are happy with the running time, and as long as the battery is not swollen, you can use it no matter the age and no matter how many charging cycles it took already.Charge the new battery, leave it in the phone, and measure how long does the new battery last. Do the same with the old battery and compare the results. To measure correctly, avoid taking or making calls during these measurements (during calls the battery drains significantly faster than in standby).
Telonic 2003 Sweep Signal Generator circuits or manual? - Page 1
Forum section: electronics / repair

author: Andrewausfa
author_rank: Contributor
timestamp: November 07, 2023, 11:22:26 pm
content: Does anyone have any information, particularly the power supply circuits on the Telonic 2003 Sweep Signal Generator please? This was recently acquired and is a mid-70s mainframe and plug-in style of system only fractionally smaller than the USS Nimitz.Any information gratefully received on this behemoth as one of the power supply boards looks as if it got bit toasty in the past and I want to review expectations before it gets 240 up it again. Linky to a similar unit below on Radio Museum.https://www.radiomuseum.org/r/telonicind_sweep_signal_generator_system_2003.htmlThanks - Andrew

author: saipan59
author_rank: Contributor
timestamp: December 29, 2024, 02:37:25 pm
content: In case you still need this, I just acquired a 2003, and I have schematics.Pete

author: Iwnug
author_rank: Newbie
timestamp: July 16, 2025, 08:57:29 pm
content: Hello Saipan59,If you still have these circuit diagrams and/or the manual:I can get one of these devices – and the documentation would be really interesting for me, even helpful in making a decision.GunWi
Temperature rating for KSD301 thermal switch used in fog machine - Page 1
Forum section: electronics / repair

author: Samuel43
author_rank: Newbie
timestamp: September 08, 2021, 03:11:38 pm
content: Hi,So I was attempting to repair this fog machine I've had for a number of years and figured out in the process that the thermal switch used to control the whole show was probably bad as it should be reading about 0.05 Ohms but when I have it disconnected my meter reads anywhere from 0.2 to several hundred Ohms. The issue I'm having is knowing what the switching temperature of the KSD301 switch in my fog machine is. I attempted to contact the manufacturer and they weren't helpful. On the bottom of the switch there are the markings "B240" and "CM". Would this suggest the switching temperature is 240'C?Thanks

author: floobydust
author_rank: Super Contributor
timestamp: September 08, 2021, 06:31:41 pm
content: KSD-301series is a bimetallic thermostat.This was talked about here:https://www.eevblog.com/forum/repair/replacing-thermal-fuse-in-a-fog-machineAntari F-80Z uses 220°C and Big Clive mentioned 200-300°C operating. So your 240°C marking is reasonable.

author: fzabkar
author_rank: Super Contributor
timestamp: September 09, 2021, 02:38:41 am
content: I couldn't believe the number of variations in the part marking that turned up in my Google Image search.This one appears to be a 110C version (marked "B110 PM"):https://www.ebay.com/itm/352623366855

author: Samuel43
author_rank: Newbie
timestamp: September 09, 2021, 03:03:52 am
content: Okay. I think I may try finding a 240c KSD301 then. My only other concern is that my fog machine contains a thermal fuse that is marked with 133'C and I really don't want to blow that if I choose the wrong thermostat. But it is placed a little bit away from the heater and has some insulation so I guess it works for this design of fog machine. Any chance the 240 means 240'F, or am I just way overthinking this.

author: floobydust
author_rank: Super Contributor
timestamp: September 09, 2021, 03:22:08 am
content: These come in many different mechanical and electrical configurations, literally 100's and everybody and their dog is making them, with their own part numbering and labelling scheme.The main danger is confusing the thermostat with the high temp safety limit switch. To make it worse, they can be located in different places e.g. one at the heater or enclosure bottom, another at the fluid exit. One keeps the heat right and another prevents meltdown.240°C = 464°F
Tenma (Korad) power supply fan sounds sickly - Page 1
Forum section: electronics / repair

author: JohnAdriaan
author_rank: Newbie
timestamp: May 08, 2020, 12:22:03 pm
content: Hi all,I have a new Tenma 72-2645 power supply (rebranded Korad KA3305P) where, as soon as I power it up, the fan starts.According tothis Korad 3305P teardown, that shouldn't happen: it's supposed to be silent until it actually starts to deliver current.But worse, although it's running, it sounds like it's "growling" - it's not a smoothly humming fan. I opened it up and the fan is definitely turning: it's not "twitching" in place like I've seen some fans do. So Irecorded the sound.I doubt it's the fan itself, since that spins fine. It's more likely to be the fan controller or temperature sensor: it kind of sounds like the fan is being turned on and off many times per second.But any suggestions are welcome!In the following picture from the above post,at the top left behind the large cap you can just see a trimpot (trimcap?). I was wondering if this could possibly be an adjustment to the temperature sensitivity? It's the only adjuster that I can see on the whole PCB.

author: TheMG
author_rank: Frequent Contributor
timestamp: May 09, 2020, 01:03:57 am
content: Really difficult to hear in the recording, but I'd say it's either motor commutation noise from the fan being operated at reduced voltage, or perhaps they are controlling the speed with a very low frequency PWM. Have an oscilloscope handy?

author: Gyro
author_rank: Super Contributor
timestamp: May 09, 2020, 10:00:25 am
content: I had something like this on an Instek PSU. The fan was basically being driven by low frequency PWM squarewave from a 555 timer and drive transistor. I cured it with an RC filter - lowish value resistor and electrolytic cap. It was quiet after that.https://www.eevblog.com/forum/repair/cured-my-gps2032-psu-rattle/
Tenma 72-1005 Univ. Test Cntr AKA Metex 9150 SJ Mk1 Schematics, Etc GitHub Link - Page 1
Forum section: electronics / repair

author: t1d
author_rank: Super Contributor
timestamp: January 19, 2021, 02:44:47 am
content: Re: This EEVBlog Forum Thread;https://www.eevblog.com/forum/reviews/metex-universal-combined-test-instrument-systemsstations-a-look-inside/It is my practice to secure extra consumables (fuses, etc.) and service documentation (manuals, schematics, etc.), upon the purchase of new equipment. Here is what I dug up, for my Tenma 72-1005, when I bought it. I still get requests for this information, so I thought it easiest for folks to just get it from GitHub. Of course, additional information may have been posted on the web, in the interim.https://github.com/TeeOneDee/Tenma-72-1005Let me know, if the link does not work. I am a GitHub noob.
Tenma 72-1030 Oscilloscope  - Page 1
Forum section: electronics / repair

author: dos_cat
author_rank: Newbie
timestamp: March 02, 2016, 03:50:45 am
content: So I just got a really good deal on a Tenma 72-1030 4ch. 100MHz Oscilloscope. The outside is a little rough, but it looks good on the inside and all the buttons and knobs seem to work. ch. 3 & 4 seem to work pretty good, but 1 & 2 might be a little funky. There seems to be some intermittent problems,but considering the age and outside condition its probably just some worn solder joints. Now I've been searching for some manuals or other info but haven't had much luck, so if any of you guys have some info that would be really great. Also any help on some calibration tests I should do would be very helpful. Seems like this is going to be a nice first scope.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: March 02, 2016, 04:35:00 am
content: ko4bb.com/manuals, elektrotanya.com

author: gearhead
author_rank: Contributor
timestamp: March 04, 2016, 01:31:25 pm
content: I would send an email to MCM Electronics Customer Service and request a manual.https://www.mcmelectronics.com/content/en-US/contactThey have sent me manuals and schematics for some of my older Tenma gear.

author: tautech
author_rank: Super Contributor
timestamp: March 04, 2016, 07:45:00 pm
content: Welcome to the forum.Better cabling will result in a cleaner waveform display and use only enough trace brightness to get your job done.CRT screen burn can be the outcome of continual high brightness settings.Enjoy your new (old) CRO.

author: bentjensen@yahoo.com
author_rank: Newbie
timestamp: June 24, 2022, 03:47:17 pm
content: I realize your posting is old, but I just got a used TENMA 72-1030A. I've been searching for a user manual, but so far not any luck. I saw your post asking for the same, so I am wondering if you had any luck and can point me to where I might find one. The link that gearhead sent didn't work, unfortunately.

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: June 26, 2022, 12:56:33 pm
content: search for Tenma they are the manufacturer.MCM is long gone now.Jeff
TENMA 72-10495 Output voltage too low - Page 1
Forum section: electronics / repair

author: Dag_Muc
author_rank: Newbie
timestamp: August 03, 2025, 01:49:21 pm
content: Dear all,this is a small report of a successful repair dual channel TENMA 72-10495 power supply, similar hardware to Korad ka3005p.Intermittent behaviorThe output voltage of one Channel was limited to app. 7.5V no matter if higher voltage has been setup.E.g. 20V set, switch on output.One relais can be heard, the voltage rises "slowly" to 7.5V and not to 20V.ErrorThe collector-connection of one output transistor D1047 was invisible interrupted due to a broken conductor path.It was near the soldering of the C-pin on the backside of the board.Measurediassamble the board from the heatsink. Remove coating near the soldering by about 2mm. Resolder the connection.yippee, power is back again...Dag
Tenma 72-1095 Isolation Transformer Face-Lift - Page 1
Forum section: electronics / repair

author: Smoky
author_rank: Frequent Contributor
timestamp: May 24, 2020, 04:02:48 am
content: On my long-list of small things to do was to replace the cruddy feet on this Tenma isolation transformer. I bought the replacement feet 11 months ago!The original rubber feet turned into something I can't even describe. I even had to dig out the Phillips head screw to get them off, and even that, they were bonded to the chassis by years of its weight and probably heat. The isolation transformer would rock on my work bench.What made this small project go even slower (2+ hours) was that the new feet are larger than the old ones and I needed to drill new holes. Some of the holes were very close to important components too.All I can say is.... It's doneShe sits nice and flat and I see no deflection in the new feet. They have a hard foam core that looks to stand up to the weight of this machine (~30 pounds). The feet are a little pricey but they look to be up to the task!The interior looked nice and clean too. I just dusted things off and put the top back on:

author: Dacke
author_rank: Regular Contributor
timestamp: May 24, 2020, 01:51:56 pm
content: I have the same model, the original feet were trashed on it as well. I simply used some sticky feet. The previous owner had also stacked multiple of these units on top of each other, and because they are so heavy it began to crush the chassis of the ones underneath so I had to beat the metal back into shape. Just be aware that it has a pass through earth connection: the earth on the outlet in front is bonded to the one on the mains power cord through the chassis.