hybridfree/eevblog-posts huggingface dataset:
TASCAM MK3 tape deck repair questions - Page 1
Forum section: electronics / repair

author: Pete66
author_rank: Regular Contributor
timestamp: December 13, 2019, 04:48:10 pm
content: HelloI have a TASCAM MK3 tape deck I am trying to repair. I cannot find the fuses. If you look at the attached schematic the 240V models have actual glass fuses.The US/CANADA model has what is called WB01, WB02, and WB03 in place of the fuses.The question is what is WB01,WB02 and WB03? Are they spark gaps or something? Did they really replace the fuses with spark gaps in the 120V models?

author: oPossum
author_rank: Super Contributor
timestamp: December 13, 2019, 06:03:47 pm
content: Jumper wires.

author: Pete66
author_rank: Regular Contributor
timestamp: December 13, 2019, 06:09:02 pm
content: I thought about that but why would they remove the fuses?

author: oPossum
author_rank: Super Contributor
timestamp: December 13, 2019, 06:22:23 pm
content: Possibly because the fuse inside the transformer is sufficient for operation at 100 to 120 VAC.
taut band meter movement repair - Page 1
Forum section: electronics / repair

author: Andyb1234
author_rank: Newbie
timestamp: December 29, 2022, 02:30:24 am
content: Hi ALL,I have a AWA G231 audio osc with a faulty meter . I think it is a taut band meter movement as the movement is suspended by a thin wire between two points. I have fixed it once but the wire has broken again and now is too short.Has anyone any information on sourcing about 5cm of this wire or a possible substitute.Cheers Andy

author: Kleinstein
author_rank: Super Contributor
timestamp: December 29, 2022, 08:44:39 am
content: From the looks the meter movement is driven by some amplifier and likely with a series resistor to convert a voltage to current. So it would not be that bad when the sensitivity would change. Sensitive movements may have a thin ribbon instead of the wire (gives better ratio of tensile strength to torsional spring constant). I don't expect this here.The restoring force goes up quite fast ( AFAIK 3rd power of the diameter or width times thichness squared for a ribbon) and the replacement should thus not be much thicker. Flattening the wire would be a last resort.So one could get away with a different, easy to solder and hard (to avoid drift of the zero) and ideally non magnetic thin wire. The main alloys in mind would be brass and bronce (e.g. manganin).Pure copper is a bit soft and likely not working (can cause drift of the zero) - maybe flattened to a ribbon or a pealed off PCB trace for more cross section.

author: Andyb1234
author_rank: Newbie
timestamp: December 29, 2022, 10:17:14 pm
content: Hi KleinsteinThanks , you are correct it is a flat ribbon soldered at each end

author: robert.rozee
author_rank: Frequent Contributor
timestamp: December 30, 2022, 01:40:27 am
content: you could perhaps try the hairspring from an old mechanical clock or watch?cheers,rob :-)

author: floobydust
author_rank: Super Contributor
timestamp: December 30, 2022, 04:49:59 am
content: I find vintage mention of Westinghouse taut-band wire 0.005"x0.005" for 1mA full scale deflection movements.Then many meter manufacturers came up with their own special wire. I think you'd have to bridge the gap from an analog panel meter manufacturer and a wire manufacturer to find a source. Or get a same make/size meter as a parts donor.The original panel meter is 100uA 2kΩ AWA 94771W52Master Instrumentsand maybe ask them (if they still make panel meters i.e. Linesman's test set looks like they do) for a piece of wire, or look for other surplus equipment that uses the same style meter.
TC-1 and TSM8N testers - Page 1
Forum section: electronics / repair

author: lionelkjh
author_rank: Frequent Contributor
timestamp: February 23, 2023, 10:07:04 am
content: Hello everyone! I am looking for the fuses to program the TC-1 and TSM8N testers (the microprocessors are: ATMEGA 324 and ATMEGA 168), (see photos of the testers). My programming software is AVRDUDE. Thanks for your help!lcr-tc1-lcd-transistor-tester-diode-resistor-capacitor-esr-npn-pnp-uniqfactory-1703-10-uniqfactory@4.jpg
TCL P715 Television goes blank a few seconds after turning on - Page 1
Forum section: electronics / repair

author: d3javu
author_rank: Regular Contributor
timestamp: April 03, 2022, 04:02:07 am
content: The mentioned tv is more than a year old so basically it is out of warranty. The tv has sound and apparently only the screen having issue which happens all of sudden.Whenever i turn on the tv, the tcl logo appears before the entire screen goes black. Tried a few different input source, it shows up on screen for a few second before goes blank but the sound works as per normal.I’m planning to take it apart to see if it is repairable, so just want to get tv gurus’ opinion on which circuit/board could be the culprit. Do let me know if any other details needed.

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 03, 2022, 03:08:36 pm
content: Most common problem for your symptoms is one or more defective LEDs in backlight.Try confirming bringing up a menu and lighting the screen with a bright flashlight while picture is lost.

author: d3javu
author_rank: Regular Contributor
timestamp: April 04, 2022, 12:53:14 pm
content: This is how it looks like, the screen comes on for a few seconds before goes blank. Notice there is back light but i can't much with flash light.https://youtu.be/2ie6mQo4BlA

author: keymaster
author_rank: Regular Contributor
timestamp: April 04, 2022, 04:59:08 pm
content: i don't thing you will see, anything with the flash light . The backlight controller is detecting one to many dead leds , and is sending a signal to shut down the tv . this is an assumption . You will have to reach the led bars, in the tv to fix and see if this is the problem .

author: james_s
author_rank: Super Contributor
timestamp: April 04, 2022, 08:11:46 pm
content: I have seen this a few times too, usually one bad LED in the backlight. Most of the time the TV keeps working but the backlight controller shuts down so with a bright enough flashlight you will normally see something on the screen.
TCL TV 75P8MR no backlight, LED strips OK - Page 1
Forum section: electronics / repair

author: Ozzitech
author_rank: Newbie
timestamp: February 25, 2024, 01:22:26 am
content: Hi, have just joint this great forum and would appreciate any hints to repair the power board of my TV. Sound and faint image when lit with a torch, but backlight not turning on. Board number is 40-L402H8-PWD1CG.The LED strips are all good, tested individually and all draw the same current at identical voltage; so guess the problem might be in the LED driver. Have just started to look into the board on the bench and will report back once I detect the problem, but in meantime any time-saving hints and schematic diagrams of this board would be great. Thanks!Update: just found the driver OZ9976 presents a short circuit from Pin15 (VN) to ground. Faulty external components are excluded, as the short is still there with the pin isolated by cutting a small gap in the PCB track. At this stage I assume the IC is damaged, reason unknown.The datasheet of the driver is very basic, anybody else experienced a similar fault or found a better datasheet ?

author: Ozzitech
author_rank: Newbie
timestamp: February 25, 2024, 04:23:14 am
content: Update: just found the driver OZ9976 presents a short circuit from Pin15 (VN) to ground. Faulty external components are excluded, as the short is still there with the pin isolated by cutting a small gap in the PCB track. At this stage I assume the IC is damaged, reason unknown.The datasheet of the driver is very basic, anybody else experienced a similar fault or found a better datasheet ?

author: Ozzitech
author_rank: Newbie
timestamp: February 25, 2024, 07:19:27 am
content: Update and correction - Pin15 is connected via an invisible track under the chip to GND, so back to debugging other problems..

author: markusdd
author_rank: Contributor
timestamp: February 25, 2024, 01:38:32 pm
content: I think you narrowed it down already.check all the inputs that are ground and supply to the IC as per the app schematic. If they are all there, check if you get switching on the transformer output, also check the transformer coils all have continuity.Last, check that none of the caps around are shorted. If this is all done I would say calling the IC faulty is reasonable.
TCP202 Tektronix Current Probe - need of EEPROM dump - Page 1
Forum section: electronics / repair

author: Harcownikov
author_rank: Newbie
timestamp: December 22, 2021, 12:55:04 pm
content: Hi!Could somebody share .bin file of his TCP202 eeprom? By mistake i blanked it during opamp repair (esd?) and my TDS3024B can't identify now that i'm connecting current probe. Chip is ST 24C02W6.Thank you in advance!

author: Teichhermelin
author_rank: Regular Contributor
timestamp: December 22, 2021, 08:54:24 pm
content: Register from 3.01. one more time with me ... I can do this for you ...

author: picburner
author_rank: Frequent Contributor
timestamp: December 23, 2021, 01:14:12 pm
content: This is my 24c02 dump. You will have my TCP202's serial number. I don't know if you can change the sn with yours, maybe there is a checksum involved that I don't know where it is.

author: Harcownikov
author_rank: Newbie
timestamp: December 24, 2021, 09:30:37 pm
content: Lovely! Thanks a lot - your dump worked perfectly. Tektronix probes has a B at the beginning and 6 digits later in SN, this was clearly visible when converted from hex (see attachment).I changed it back to my SN and flashed it, I can use my current probe without manually changing the settings again!Thanks dude.
TDA8953TH / Large DC offset causing shutdown. Need help - Page 1
Forum section: electronics / repair

author: mkiijam
author_rank: Regular Contributor
timestamp: February 06, 2023, 06:42:43 pm
content: I'm working on a portable PA (Yamaha) that is going into to shutdown from presumably the DC offset I am seeing on the outputs. It uses a TDA8953 as the power amp and my question, not having a ton of Class D chip amp exp.) is;Would this much DC on the output indicate a failed chip?1. About full rail on output 12. About half rail on output 23. About 3/4 rail on input 1, but on the "chip side" of the coupling cap.4. About 1/8 rail on input 2, again, on the chip side of the couple cap.

author: Vicus
author_rank: Regular Contributor
timestamp: February 11, 2023, 07:08:18 pm
content: You have a faulty IC and good luck to find a new and genuine one.
TDC 1500 receiver FM misalignment. - Page 1
Forum section: electronics / repair

author: Arty30
author_rank: Regular Contributor
timestamp: October 24, 2022, 10:54:07 pm
content: Hello everyone. I am currently doing a small project of an obscure little receiver by the name of TDC 1500. From what I can tell it was the house brand of the electronics chain store Tech HIFI. It is working great other than the fact the whatever station I'm picking up, even if it's a good strong signal, reads about 0.5Mhz too high on the dial. For example if I receive 103.7, the dial will say 104.2. My first thought was that I could mechanically adjust the dial pointer, except that I can pick up 850 AM and the pointer is right on the money. I could not find any documentation on this receiver so I do not know how to proceed with troubleshooting. If anyone has any documentation or pointers on the solution, I would be grateful.Arthur.
tdk dc-dc CE-0966 - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: November 14, 2019, 07:04:18 am
content: HiLooking to source TDK Dc-Dc CE-0966 used in allen bradely IO Module . trying to get the datasheetoutputs +15v, -15V and +5 VThanks in advanceAnand
TDK Lambda Alpha II 650 Power Supply issue - Page 1
Forum section: electronics / repair

author: ramin.azizli
author_rank: Newbie
timestamp: May 22, 2017, 08:31:01 pm
content: Hello everyone,I have Alpha II 650 power supply by TDK Lambda. Here is the link in case you want to have a look:http://www.tdk-lambda.com/products/sps/ps_alpha/alpha2/indexe.htmlJust quick explanation: Alpha II 650 power supply (input: 110VAC, 220VAC) has an AC filter and 375VDC in the output. Output goes directly into a transformer with ferrite. That transformer gives ~18VAC pk2pk (!) at the secondary side which is the input of the DC to DC converters. This is what I get with my oscilloscope (see attachments). Ground was at the center of the screen when I made measurements.So I have in repair one of these boards and it has a problem with its DC to DC converter (24V). In order to hook that up to the lab power supply I need to know the input voltage (which is obvious). But my multimeters did not measure anything neither in DC nor in AC mode at the input of the converters. Meanwhile as was mentioned before I measure 17.8VAC pk2pk (50Hz sinusoidal) with my oscilloscope (see attachments). So I'm puzzled.Can you please advise or help to find out that input voltage?Maybe someone has some experience on this boards and maybe he knows the general problems that faces these type of boards (especially with the DC to DC converters).I would highly appreciate if you can share your knowledge.Looking forward for your responses and help.Thanks in advance to the whole community here...

author: marcelo.digital
author_rank: Newbie
timestamp: March 31, 2021, 03:26:19 am
content: Olá.. você continua trabalhando com fontes Alpha TDK 400 e 650? Também sou tecnico e gostaria de trocar informações com você, pois estou me especializando nessas fontes de minilabs. Por favor entre em contato, AbraçosHello .. are you still working with Alpha TDK 400 and 650 fonts? I am also a technician and would like to exchange information with you, as I am specializing in these sources of minilabs. Please get in touch, Hugs
TDK-Lambda Nemic-Lambda Dodgy Knob - Page 1
Forum section: electronics / repair

author: gigavolt
author_rank: Contributor
timestamp: May 14, 2021, 02:56:05 am
content: The labs I work for really likes to use these TDK-Lambda power supplies. They're the little 2"x4"x18" units with a few buttons and a single knob on the front. They seem nice, but I swear a solid 25% of them (like five at this point) have an issue where the knob on the front goes bad and only decrements the values on the screen. IE you turn the knob clockwise on the voltage setpoint menu and it just decreases the voltage to zero (it's noisy and sometimes the voltage does go up a bit, but generally just decreases). It makes them impossible to use except for remote control (fortunately how we mostly talk to them anyways, but still annoying).Given how common this is in our lab it seems like a dodgy design and I thought I'd check here if anyone knows more / how to fix it. A brief search revealed nothing.

author: gigavolt
author_rank: Contributor
timestamp: May 14, 2021, 03:35:53 am
content: OK, so I opened it up and the knob is a quadrature encoder. Seems like both phases work fine enough but are a bit noisy if I watch them with a DMM. Don't have anything nicer to look at it for the moment however. Might try contact cleaner tomorrow.Edit: And if I spend some time turning the knob back and forth quickly I can sort of make it work. Probably wiping some dirt out of the encoder. Crazy that this is a thing that happens regularly with these units.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 16, 2021, 02:34:00 am
content: Hi,I have had similar experience with four ZUP 60-7 power supplies.I had to take the encoders apart. I cleaned the contacts with DeoxIT.At the time I ordered EN16-H20AF15 from Digikey (987-1199-ND) as a spare part. I haven't tried these in a power supply. These are very reasonably priced.Regards,Jay_Diddy_B
TDK-Lambda Z+ - Page 1
Forum section: electronics / repair

author: rtekal
author_rank: Contributor
timestamp: December 06, 2022, 05:30:21 am
content: HiI have a TDK-Lambda Z+ 36V / 12A Power supply. It shows fail, when the output is switched on. After swapping the control board from a borrowed good unit, and later swapping the IC A106 on the control board, the failure got resolved. It's a TSSOP with 508RP marking with ST logo. The ST website does not have any info regarding the same. No service manual is also available.Need help on this.Thanks for your time.Regards

author: syau
author_rank: Frequent Contributor
timestamp: December 06, 2022, 01:35:48 pm
content: M95080-RDW6TPhttps://www.st.com/resource/en/datasheet/m95080-r.pdf

author: rtekal
author_rank: Contributor
timestamp: September 04, 2024, 04:22:23 am
content: HICan we copy the eeprom data to a new eeprom. I have a Z+ with a mismatch between the output and displayed voltage. I am getting full voltage at output but the display goes upto only 2.4 v at max voltage.I replaced the eeprom from a good unit and it was ok. It is not correcting even after a factory reset.Regards
TDS 3052 - Page 1
Forum section: electronics / repair

author: Orion63
author_rank: Contributor
timestamp: January 27, 2021, 12:57:22 pm
content: I intend to buy this Tektronics TDS 3052 since it is being sold at a very attractive price point. However there are some issues with the Display as seen in the attached picture. I know, I need to change the Polarizer for sure. Other than that, I can see some coloured vertical lines on the screen. I am more worried about those. Any suggestions from previous experiences dealing with repairing to remove these lines.Regards

author: Kibabalu
author_rank: Regular Contributor
timestamp: January 27, 2021, 01:18:22 pm
content: Any idea what caused that failure? It looks strange. Hopefully not a damage caused by water! For such a case you are just seeing the top of the iceberg.Some time ago I repaired such a model, but the failure was 'just' on the rather simple power supply and battery charge board.On youtube you'll find a video with the replacement of the display. The video shows also the part number of the display if you have to order it.

author: Orion63
author_rank: Contributor
timestamp: January 27, 2021, 02:04:43 pm
content: @Kibabalu, Thank you for the reply. I am yet to buy this scope from the seller neither does the seller know as to how this scope became defective. It would be just a gamble, if I have to buy this scope. I was trying to see the odds of making it work again !!!

author: CaptDon
author_rank: Super Contributor
timestamp: January 27, 2021, 06:04:45 pm
content: Wow, that looks like a project for someone who repairs these every day. That unit looks broken and abused. Cheap isn't cheap if the parts to repair it can't be found and the damage is extensive. I would only buy that scope if it was dirt cheap and I could rob parts from it to fix a scope showing much less abuse.

author: Orion63
author_rank: Contributor
timestamp: January 27, 2021, 11:54:32 pm
content: @CaptDon, I tend to agree with you. I was thinking, if it just involved a kind of Polarizer replacement and perhaps a clean-up of the display or other connector contacts as suggested by some other troubleshooters of LCD display panels. Thanks, for your suggestion. I think, I will pass this one !!Regards.

author: m k
author_rank: Super Contributor
timestamp: January 28, 2021, 09:21:34 am
content: You better be.Many times a frozen stuff leave sort of a border a bit bigger than a melted area.I guess salt do something similar when partially dryed area is smaller.Anyway, if that is moisture you can guarantee that screen is not the only affected place.Is the power button surroundings different than other places?If so then face is cleaned and you don't know what kind of a monsoon it has experienced.
TDS 380 Timing Compensation Failure - Page 1
Forum section: electronics / repair

author: garyappel@twc.com
author_rank: Newbie
timestamp: May 17, 2025, 12:56:22 am
content: I note that others have reported a failure of the timing compensation for the TDS 380.I had earlier purchased a TDS380. When the Dallas chip failed, I replaced it with a DS1744, went through the calibration procedure, and all was well.I recently picked up another TDS380 - couldn't pass it up for $20. The Dallas chip was original, heading towards 30 years old, so I decided to replace it before it failed, figuring I would read the RAM form the existing 1644 and program the 1744. I used a minipro programmer which would not read the RAM, but managed to corrupt it. I believe that others have had this same experience (did not know that when I attempted to read the RAM contents). I replaced the Dallas chip, with an un-programmed RAM on the new 'scope, and was able to calibrate except for the timing compensation, which fails every time. I see that others on the forum have struggled with this calibration procedure as well.I have also noted that the RAM contents do not appear to be compatible between the two 'scopes. The original 'scope is firmware version V1.02. The newer 'scope is firmware version V1.09. Swapping the existing Dallas chip from the older 'scope into the newer 'scope results in errors. (I installed sockets before installing the new chips.)It has been proposed elsewhere on this forum that, if the initial calibration constants are invalid, the firmware will not allow the compensation procedure to complete correctly.Aside from failing the timing compensation calibration, the 'scope seems to be working okay. I don't see any difference between looking at the 1 ms calibration signal between the two 'scopes. Is anyone familiar with what the timing compensation does?Has anyone been able to complete the timing compensation on a 'scope with invalid timing constants?Has anyone used the minipro programmer to successfully program a Dallas 1744?If so, does anyone have a content dump from an existing Dallas chip from a calibrated TDS380 with firmware version V1.09?Any help would be appreciated.Gary Appel
TDS-640A Processor and Cal Initialization Fail after repair - Page 1
Forum section: electronics / repair

author: hazardsneon
author_rank: Newbie
timestamp: May 09, 2025, 01:30:56 pm
content: I have a TDS 640A that I have been working on and I am a little stuck.This all started when the Horizontal Hold started to fail on the CRT. It completely functioned except for, after a while, the screen would go squiggly.After doing some searching, I found the thread that talks about a resistor that usually fails on the CRT board and causes the loss of horizontal hold. That was fine, so I just replaced a bunch of electrolytic caps in that section of the board. That all seems to be good now.However, while I had it open I decided to do some preventative maintenance. Since the DS1650Y-100 and DS1286 have been known to die and cause issues, I had them pulled, used a universal programmer to pull a hex off of each part, had sockets soldered into place and reinstalled them.Also, while I had the main board out, I figured I would have the SMT electrolytic caps replaced because those are known to fail too.With all of this rework done, I power up and now have Diagnostic Failures during self test. On boot up, I get a FAIL for Processor and Cal Initialization. Also, the channels each have different DC offsets ranging between +80mV and -230mV. Additionally all channels go super noisy when the time base is increased above 2MS/s.I try to check the diagnostic log by going into the system config and when I press the soft key multiple times to select "Diag/Err" I get to down to "Cal" and the scope pops up an unrecoverable error "Invalid Selection". I have to reboot to get it back to operation.I read that the NVRAM DS1650 failure can cause some of my errors, so I went and bought a DS1650Y-100 and DS1286 from eBay, not ones that are super cheap direct from China and the sellers look promising. Unfortunately, when I tried to burn the hex that I pulled off of the original parts, the download appears to fail during verification after programming but I installed them anyway. The DS1286 seems to work but when I install the DS1650Y-100 from eBay, the scope will not boot and all segments on the 7 segment display flashes. I will be working on getting a refund for the DS1650 and I have re-installed the original DS1650.I may have missed details or I might have overshared but I wanted to share as much as I can remember.Does anyone have an idea of what to do next?Thanks!

author: hazardsneon
author_rank: Newbie
timestamp: June 23, 2025, 12:25:04 pm
content: I bought "Exact functional replacement for DS1650Y used in Tektronix Applications" from eBay. Seller kellyjo_13The seller was able to take the Hex that I pulled from my part and preprogram the new part.My scope is now fully passing it's tests and appears to be calibrated.

author: TERRA Operative
author_rank: Super Contributor
timestamp: June 23, 2025, 12:43:58 pm
content: Ah, another happy customer of kellyjo_13 I see.I've used his NVRAM replacements on a few scopes so far, including reviving a TDS784D and they always work perfectly and he is always great to work with.
tds 694c 754d 784d backup of hard disk? - Page 1
Forum section: electronics / repair

author: youxiaojie
author_rank: Newbie
timestamp: May 28, 2020, 06:54:58 pm
content: does any one has the backup of tds 754 784 hard disk's backup? my harddisk is down!files are missing! I decide to replace a laptop harddisk. but the software on harddisk is missing all! who has the backup? thanks!! is the 20G hd ok for 784?
tds 724 or others LCD conversion - Page 1
Forum section: electronics / repair

author: Rollin Hand
author_rank: Regular Contributor
timestamp: May 20, 2019, 11:59:08 am
content: After fixing the PS, the CRT is gone.And I need to do a LCD conversion,I look on you tube and the internet I think I saw all,my problem is I need measurements of the hardware to mount the LCD ,and if I use Plexiglas in the front it will have too much reflexión of outside light.I have a 6.5" LCD but now I see some 7" on epay will this fit?Thanks RI saw some modes with a 12v to220 relulator will this will be sufficient for the lcd module?

author: Neuro
author_rank: Contributor
timestamp: August 26, 2019, 05:56:07 pm
content: I've just done a CRT to LCD conversion on the Tektronix TDS754D using a NewScope T1 Kit.Here is a video about it:https://youtu.be/KZfj57kVzEI

author: Rollin Hand
author_rank: Regular Contributor
timestamp: August 28, 2019, 05:21:50 pm
content: too much money for one of these kits.now I got the LCD Display Panel Touchscreen G065VN01 V2 and i found a chineese driver board wich i tested with the scope vga output an provides a good picture and aspect ratio.Now the issue to mount this inside the crt cavity,shoud I use silicon glue for this? I have also a pice of plexiglass that I can use,any one with this procedure can give me some help?I spend less than $80 for all the materials including the LCD.Thanks

author: Rollin Hand
author_rank: Regular Contributor
timestamp: August 28, 2019, 05:24:47 pm
content: Thanks for posting the video.
tds 724 power supply - Page 1
Forum section: electronics / repair

author: Rollin Hand
author_rank: Regular Contributor
timestamp: May 16, 2019, 11:48:25 pm
content: Does someone know how to start the power supply board out of the scope for testing all the voltages.the service manual calls for a temporary short on pins 3 and 5 of J26 ,but I dont find J26.Thanks

author: picburner
author_rank: Frequent Contributor
timestamp: May 17, 2019, 05:03:02 am
content: J26 is located on the CPU board and it connects to J6 on the power supply via the larger flat cable.The pins 3 and 5 should also match on J6, check anyway.

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: May 17, 2019, 05:37:57 pm
content: If it's dead... It's probably problem with two suppression diodes and the transistor. I've had 744 with the same problem.The transistor in mine was BU508.. if I remember.

author: Rollin Hand
author_rank: Regular Contributor
timestamp: May 18, 2019, 03:47:31 pm
content: Thank youI already have the bu508 and the 2 supresor diodes,the function is the 15v stand by supply,if the 15v are not present does not work.thanks for the response.

author: Rollin Hand
author_rank: Regular Contributor
timestamp: May 18, 2019, 08:53:11 pm
content: after checking my ps had the top200y for the stanby ps 12v in this case .find r1476 out of value, replaced and burn out.After removing some withe silicone arround the top200y I notice c116 had a litle black hairline crackand it was almost short .After replacement for another .01 500v and the 2.4 ohm resistor now I have the 12 v bias .I had in stock the top225 this will work too? in case I need replacement?R.
TDS5054 backup image - Page 1
Forum section: electronics / repair

author: sprit
author_rank: Regular Contributor
timestamp: May 17, 2025, 04:27:10 pm
content: Hello everyone, good day to everyone.I have an old TDS5054 that has a damaged original hard drive, I tried reinstalling Windows 2000 on the new drive and installing the software but there is an error when starting the application. It seems that I am missing some driver. I searched all over the forum but could not find any post with a link to download a backup of this model. Does anyone here still have a backup of this model? I would be very grateful for that, thank you very much.Sincerely,Feng

author: coromonadalix
author_rank: Super Contributor
timestamp: May 17, 2025, 07:59:05 pm
content: go in windows device manager and list all the drivers / peripherals with an exclamation mark and please give their vid pid informations while going on each detail sectionthat's a first

author: sprit
author_rank: Regular Contributor
timestamp: May 18, 2025, 05:03:35 am
content: Hellohere is picture in device manager, hope it can help.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 18, 2025, 01:04:34 pm
content: no not enough you need to get all the erros vid and pid, you can google on how to get themon each error you go in their properties and detail section, you scoll down and select the hardware properties and open it to get the vid pidsome errors could be motherboard related and prevent the scope SW to detect the hardware and work with itthats why for your motherboard, you mostly need the intel chipset drivers, and other(s) from the board maker, sound, lan, vga, serial ports etc ...so far you miss, thenetwork controller, mobo relatedpci devices surely mobo relatedmultimedia xxxx is mobo related sound driverspci simple communication, surely mobo relatedBUT could be the scope interface or the other pci devices errors ....

author: madao
author_rank: Frequent Contributor
timestamp: June 11, 2025, 06:45:20 pm
content: I have here a TDS5054 backup (not full, few data missing (tekscope data missing))I have backed partially up, before harddisc died finally.I think: you can pull driver and application from my "image" (except tekscope-application,they is broken )Pleas share your image to uns, if you're able getting your TDS5k to working.https://drive.google.com/file/d/1j5V-E_Rwd_r0zWyKaU3bQ6EGZZAUdhBA/view?usp=sharinghttps://drive.google.com/file/d/13komQQ2tc3y8aKLZE1NaCT5_sFl2Yg-J/view?usp=sharingI'll removing g-drive file in few months.. OK. ?

author: coromonadalix
author_rank: Super Contributor
timestamp: June 12, 2025, 02:34:48 am
content: The Tektronix Folder contains all you need ... start from there first
TDS1001B  USB - Page 1
Forum section: electronics / repair

author: 66bono
author_rank: Contributor
timestamp: March 07, 2025, 09:06:06 am
content: Hello, the USB hub overvolted and caused a number of damages, it damaged the USB ports in the laptop, printer and osloscope. I replaced the motherboard in the laptop and repaired the printer port. The osloscope remained. I replaced the protection at the input, but the port does not work. The protection was damaged at the Current voltages 5V 3.3V and 2.7 V, the lowest resistances on the USB 340 R and 450 R. Is a fragment of the diagram available?
TDS1002B not booting consistently - Page 1
Forum section: electronics / repair

author: cesare
author_rank: Contributor
timestamp: December 31, 2022, 03:35:16 pm
content: I've got a bit of an issue with a TDS 1002B which is not booting consistently. However, there's a spot on the circuit board which if I heat with a hot air gun reliably allows the instrument to boot. So, my thoughts were that this was either some sort of dry solder joint, a component which only works when hot, or a problem with a via.I've checked and re-soldered all the components nearby, and can't measure any change in the board when cold or working.Once up and running, the board works reliably, and will reboot if I restart it for a few minutes after powered down. If I start it from cold and leave it in the stuck failing to boot state (say for 5 minutes) it will then start without applying heat.The PSU rails look to be stable and in spec, no undue noise, no obvious short between the rails and ground. I'm just unsure where to go next. Am I likely in the right area or is there something else i've missed I should consider?

author: bidrohini
author_rank: Regular Contributor
timestamp: December 31, 2022, 04:05:44 pm
content: This is the service manual of TDS1000B. You may find some similarities with your version:https://www.farnell.com/datasheets/1760369.pdf
TDS1002B PSU repair - Page 1
Forum section: electronics / repair

author: Slh
author_rank: Regular Contributor
timestamp: November 07, 2023, 08:32:32 pm
content: Having successfully fixed my TDS1002B yesterday (for the third time) I thought I'd put a post out in case anyone finds the same problem.My scope came to me with a fault where it wouldn't start up. The back light and LEDs would flash every second or so but it wouldn't get any further. I guessed that it was a power supply issue and investigated more. I believe it's got a flyback producing around 12V and then several other supplies off that one. The power rail would go too high, hit some sort of over-voltage threshold and then turn off. And repeat.I spent a while desoldering, testing and replacing a load of components in the feedback circuit without finding any iffy parts. As you do, I plugged it back in and it worked! Aha, iffy solder joint!It's failed twice more since then. The second failure was exactly the same but now I knew what I was looking for so I just hit a load of joints in the feedback circuit with the soldering iron until it worked again (I know - scientific right?).The third failure, I was really struggling. Hitting all the solder joints in the feedback circuit with the iron did nothing. Eventually I found a tinned wire link that clearly had a bit of extra oxygen etc. No solder was sticking to it. I replaced the wire and problem solved.When the scope came to me it had clearly had a rough life (some impressive laser burns). It's possible that the solder just cracked from physical abuse. Since then, it's had a fairly gentle life on the shelf as I tend to favour my Rigol so I don't know why it's kept failing.

author: Vovk_Z
author_rank: Super Contributor
timestamp: November 10, 2023, 05:54:30 am
content: I can add my experience too:If it doesn't start or starts and goes off immediately (tries to start) and has some years then the reason is typically one or two aged electrolyte capacitors on a power supply board.I guess your scope has some years.I had similar problem several days ago with an old GDS-806. Two small electrolytes and one larger needed replacement. I have in-circuit ESR meter so it is quite easy to find bad electrolyte cap with it. If you don't have one (I guess you don't) you may start with replacing all small electrolytes first. There is a stand by power supply (with small caps) and main one (with larger caps like 330 uF 25V). Or just recap all electrolytic caps on a power supply board. You need caps of a Low-ESR type.But be carefull with polarity - it's easy to put it wrong.Check large semiconductors too just for a case.

author: Paulo Peres
author_rank: Contributor
timestamp: November 10, 2023, 11:06:42 pm
content: I had PS issues with a TDS, too. These artesyn boards are designed with caps too close of hot areas.These are the first suspects.
[Solved] TDS1012 (TDS1000/2000) can't display sharp vertical line - Page 1
Forum section: electronics / repair

author: samoEEVB
author_rank: Newbie
timestamp: April 17, 2024, 09:43:34 am
content: I recently purchased a broken TDS1012 to practice repairing.It had some water damage and a short to GND at a decoupling capacitor (array) for the acquisition ASIC, it wouldn't boot when I purchased it and the acquisition ASIC would go as hot as 130c when powered up due to the short.I cleaned up the water damage and replaced the capacitor array, it can boot up and pass power-up tests.However, now it seems it can't draw sharp vertical lines such as rising/falling edge of a square wave:I can see dots moving vertically on the edge though, so this feels like it could be a vertical data display problem.Some information I can provide now:It's not an LCD display problem, I've tested with a known good display.The water damage actually is right around the circuit at the output connector to the display, it corroded so bad that it created an invisible break at the middle of the resistor and capacitor array of data line 1. Causing the display to miss one vertical line in a pattern. I had to manually bridge it to repair this issue.The scope can display the rising/falling edges if I switch horizontal window to a shorter period, so it seems the problem is more like it can't display a "long" single-pixel-wide vertical line.I've compared it to a known good scope and the acquisition data seems to be OK although the ASIC had been heated up to 100+c multiple times due to the short.I double-checked that the four data lines to the display are OK. (There are no breaks, at least.)Now I'm not sure how to proceed with pinpointing the exact source of this problem and could use some suggestions from experienced friends here. It would be nice if someone could share the knowledge of how the acquisition data is drawn on the display.Fingers crossed for it to not be an ASIC problem!

author: Greybeard
author_rank: Frequent Contributor
timestamp: April 17, 2024, 12:31:01 pm
content: Are you sure, your display setting is "VECTORS"?Push the button "DISPLAY".Set "TYPE" from "DOTS" to "VECTORS"

author: samoEEVB
author_rank: Newbie
timestamp: April 18, 2024, 05:37:43 am
content: Doh!Thanks a bunch Greybeard, I can see the vertical lines now after setting the option to vector. That's one more scope saved from the dumpster
TDS2004B broken - Page 1
Forum section: electronics / repair

author: S3b
author_rank: Newbie
timestamp: May 02, 2025, 02:12:19 pm
content: Hello,Today, I'm reaching out for help with my TDS2004B oscilloscope.After many years of loyal service, it suddenly started showing all four channels as faulty on startup.Indeed, it was no longer possible to take measurements (the oscilloscope was behaving erratically). The "PROBE COMP" output was at 3 kHz instead of 1 kHz.One of the power supply rails had collapsed.So, I took out the thermal camera to find the issue.Bingo! It turned out to be a faulty ceramic capacitor array (marked "C333") ! Once the component was removed, the oscilloscope started working normally again ! CoooolMy question is : what should I replace it with ? Should I also replace the other capacitor arrays as a preventive measure ?Thanks in advance,S3b

author: factory
author_rank: Super Contributor
timestamp: May 02, 2025, 03:30:47 pm
content: Errors on startup & the 3kHz-ish cal signal, caused by those shorted ceramic capacitor arrays, this seems to happen on various models from the TDS10xx & TDS20xx range.I had the same problem with a TDS2014 causing channels 3 & 4 to fail, this thread helped with my repair;https://www.eevblog.com/forum/repair/tektronix-tds2024-oscilloscope-repair-logThe replacement capacitor array I used was a 4x 100nF from Yageo, part number CA0612KRX7R9BB104, similar parts will be available. C633 was the shorted array in mine, causing acquisition failure of channels 3&4, I only replaced the faulty one.David
TDS2022 repair - Page 1
Forum section: electronics / repair

author: mwbarth36
author_rank: Regular Contributor
timestamp: April 24, 2021, 08:49:13 pm
content: Can anyone help with a problem I am having with a TDS2022 oscilloscope. 1.- Would like to have schematic, but that appears not to exist. 2.- I have traced the problem to a single chip. It is labeled TT010 with 42K below that number. It is a TI part. I believe this to be a Flash Memory, but cannot find a data sheet. It is a 24 pin surface mount part. 3.- If this is a Flash, does it contain any information for scope operation that would have to be programmed if it is replaced, or is it simply for storing waveform information from the use of the scope? A data sheet for this part would help a lot. Please, any information anyone has will be greatly appreciated! A schematic would be fantastic!!To give a further definition of the problem I am having:If I power on the scope at room temperature, nothing displays, front panel lights are on and backlight is on. If I first heat the TT010 just a few degrees, then power the scope on, all is fine, it goes through the normal start up sequence with no errors, and it works perfectly. Once running, I can cool the TT010 forever and it will not quit. Once running it is just not sensitive to temperature. Same if started in the 'non running' state, once started in that state no amount of heat will bring it into an operating state. So, only the start up sequence is temperature sensitive. I have tried re-soldering the pins of the TT010, it did not help. Any thoughts or suggestions would be greatly appreciated.

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 25, 2021, 03:51:58 pm
content: The fact that preheating the device has an effect on the scope starting normally or not very probably indicates that the unidentified part is bad. Still it would be worth checking at least supply voltages and ripple on this part.For part identification a good overall photo and detailed photo of the part would help."010" would seem to be a 1Mbit memory but a 1Mbit device doesn't fit the 24pin count. A128kbit device would fit the pin count.

author: mwbarth36
author_rank: Regular Contributor
timestamp: April 26, 2021, 12:52:32 am
content: Thank you for your input! I have done a bit more research. Looking at the signals on the pins it has become obvious this chip is not a Flash memory. When the scope is operational the eight microprocessor data lines are connected to this chip, but there are no other control lines present. Turns out this chip is most probably a SN74TVC3010 used as a level converter for the 3.3 Volt microprocessor data lines to a standard 5 Volt logic used in the scopes add on features. Just how this chip can prevent the proper start up of the scope when cool prior to power on is still a big mystery. My next step will be to replace the TT010 chip as I can purchase the 74TVC3010 from several sources.
tds210 anyone know the voltage that feeds the primary winding of ccfl - Page 1
Forum section: electronics / repair

author: nic77
author_rank: Contributor
timestamp: January 30, 2022, 02:11:56 am
content: hi to all ,can someone help ,tds210 anyone know the voltage that feeds the primary winding of ccfl backlight cause i have no idea ,thanks in advance .

author: CharlieD
author_rank: Contributor
timestamp: January 09, 2024, 07:34:34 pm
content: Is -5V.
TDS210 self calibration failed - Page 1
Forum section: electronics / repair

author: Mauri_78
author_rank: Newbie
timestamp: March 06, 2025, 10:53:16 am
content: Hi all, this my first post!I'm Maurizio from Italy, Turin and my passion is electronics in general with special matter for instrumentation.I'm trying to fix a Tektronix TDS210 that fail self calibration.Startup test are all passed and the instruments seems to work correctly, signals are correctly visualized, trigger is ok, probe compensation signal is present etc.There aren't any errors reported but if i launch self calibration routine from utility menù it fail.Thank you very much, every suggestion is appreciated.I have already tested the power supply and it seems to be OK, all the voltages are present and with the correct value. To be sure i have also replaced all electrolitics capacitors.Maurizio

author: TERRA Operative
author_rank: Super Contributor
timestamp: March 07, 2025, 12:22:29 pm
content: Can you show us what waveform the probe calibration shows on each channel?When you replaced the capacitors in the PSU, what capacitors (Brand and model) did you use?
TDS210/220 etc. Display plastic cover? - Page 1
Forum section: electronics / repair

author: JMcC
author_rank: Contributor
timestamp: March 28, 2023, 08:47:40 pm
content: I'm looking to buy some clear plastic/polycarbonate to replace the plastic display shield on these scopes. I have 2 which are a bit messed up, one badly scratched & the other looks like someone made a habit of poking the centre of the screen with something. Displays themselves are fine. The existing cover is mounted (glued) to a 3-4mm foam 'bezel' which is itself glued to the LCD display. The plastic thickness is about .25mm or so. I've so far not found anything suitable I can use to replace the shield plastic thats not 1mm thick. Don't want to use anything too flimsy, but 1mm is a bit much...Anyone have any pointers? I'm based in Europe.Thanks,J
TDS3000 DS1744WP to DS1742W adapter board - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: November 18, 2020, 04:16:15 am
content: Did anyone in the UK get some of these PCBs that James-S made up? If so you you have any spare boards?ThanksDavid

author: sicco
author_rank: Regular Contributor
timestamp: November 18, 2020, 03:08:48 pm
content: I have a few spare of my own design, with the DS1744W on a plugin module. Gets you a serial port also, Bluetooth, WiFi and USB serial. But no more VGA, no GPIB, and on these also no Ethernet yet. The latter still work in progress.See elsewhere on forum what patchwork is needed on the TDS3000 main board. Not as hard as swapping the DIP 24 DS1742W module. That one just stays where it is.Not in the UK. But in the united states of Europe. But if you hurry up, you can have me ship it to you before no-deal brexit is a fact...

author: perdrix
author_rank: Frequent Contributor
timestamp: January 21, 2021, 11:31:25 am
content: I ordered a set of 3 boards from OSHPark.I have two available if anyone in UK wants one. Say a fiver each.HtHDavid
TDS3000 Series  latest  firmware needed - Page 1
Forum section: electronics / repair

author: Jarek
author_rank: Regular Contributor
timestamp: January 18, 2022, 06:40:32 pm
content: HiI need old tds3000 series firmware version e.g. 3.15 or 2.27 etc.Has anyone ?

author: MarkL
author_rank: Unknown
timestamp: January 18, 2022, 09:51:04 pm
content: v3.41 is still available directly from Tek:https://www.tek.com/en/support/software/firmware/tds3000-and-tds3000b-series-firmware-fv341That was the last version for the plain series (not B or C series).To get it, you need an account or have to create one. If you don't like that, seehttp://bugmenot.com

author: Jarek
author_rank: Regular Contributor
timestamp: January 18, 2022, 10:26:23 pm
content: Thanks MarkL, but I need the older versions .3.41 version I already have.

author: benj38
author_rank: Frequent Contributor
timestamp: January 19, 2022, 12:12:15 pm
content: If you need this for the famous hack, version 3.39 will do.PM me if 3.39 is good for you.

author: Jarek
author_rank: Regular Contributor
timestamp: January 19, 2022, 12:29:53 pm
content: Thanks Benj38 , but I need the older versions v3.5 or v3.27 . The famous 3.39 version I already have.Best regards

author: blackfin76
author_rank: Regular Contributor
timestamp: November 09, 2022, 09:09:16 pm
content: Quote from: Jarek on January 19, 2022, 12:29:53 pmStill need V3.27 ?I have V1.10; V3.22; V3.27

author: Jarek
author_rank: Regular Contributor
timestamp: November 09, 2022, 10:54:44 pm
content: HiI sent you an PMBest regards Jarek
TDS3000 series Schemattics anyone? - Page 1
Forum section: electronics / repair

author: Tracker
author_rank: Regular Contributor
timestamp: November 16, 2021, 07:25:49 pm
content: Hi Folks,I can locate the TDS 3000 Service Manual online but the Diagrams section is blank?Has anyone got them available to share?Ps, mine is a TDS3054ThanksTracker