hybridfree/eevblog-posts huggingface dataset:
round 45mm photovoltaric ? where ? - Page 1
Forum section: electronics / repair

author: oz2cpu
author_rank: Frequent Contributor
timestamp: November 01, 2022, 09:23:41 am
content: i need a 45mm round photovoltaric any one seen that ?https://youtu.be/wRORiFsNX2U

author: DavidKo
author_rank: Frequent Contributor
timestamp: November 01, 2022, 12:20:50 pm
content: Are you sure that the detector is damaged? Maybe you can try to connect the meter directly to the cell and measure the current. It can be bad contact. between cell and wiring.Edit: or something can be shortening the photocell.

author: oz2cpu
author_rank: Frequent Contributor
timestamp: November 01, 2022, 10:00:00 pm
content: like i show in the video, the meter works, but the sensor dont deliver any current,the sensor deliver plenty of voltage when unloaded, but the meter unly use very little current,in the range of what i guess it normal for that time,so i am sure it is the sensor it self,i think it was allready up before, something about photovoltaric, specially the old ones dont live forever.

author: jdragoset
author_rank: Frequent Contributor
timestamp: November 02, 2022, 12:25:23 am
content: Plenty of thesehttps://www.ebay.com/sch/i.html?_from=R40&_trksid=p2505460.m570.l1313&_nkw=weston+light+sight+meter&_sacat=0out there elements appear to be 45 mmCheck with DVM on milliamp scale connected to sensor for current output.The Weston elements use circular contact rings that are subject to contact resistance problems.Since the back side of the sensor disc is directly connected to one wire, the front contact ring may be high resistance.Try slight rotation of the sensor disc while slight pressure is applied to the back spring.The Weston 703's function can be restored by slight rotation of the top glass.
RouterBoard SXT 5ND does not boot - Page 1
Forum section: electronics / repair

author: 800908
author_rank: Contributor
timestamp: November 06, 2020, 06:10:40 am
content: himy sxt lite5 antenna is not booting.after applying power to it just turn on the power led and three top signal led as you can see in picture below.it does not beep or any things else.all voltage present.1.7v, 2.1v, 3.3v, 5v.caps around ICs are not shorted.what the problem do you think?" alt="" class="bbc_img" />

author: 800908
author_rank: Contributor
timestamp: November 07, 2020, 06:02:43 am
content: as I searched the internet the bios is corrupted and need to be replace.but the problem is there is license in the bios chip that need to be restored.how can do this without loosing license?
ROWAC VBE 20 PULSE ERROR CODES - Page 1
Forum section: electronics / repair

author: HUGOMAN
author_rank: Regular Contributor
timestamp: May 19, 2025, 08:53:42 pm
content: Hello to AllI have a MIG welding machine Rowac VBE20 pulse giving error code E05, does anybody have a user manual ? because i couldn't find in the internet.Regards
Rpair asus K551L headphone jack - Page 1
Forum section: electronics / repair

author: reeks
author_rank: Newbie
timestamp: February 16, 2020, 01:28:03 pm
content: Hello, I have an asus K551L laptop with a broken headphone jack. At first glance i told myself easy fix...But unlike traditional components 3.5 headphone jack dont have serial number, and there is a wake tone of differents types chapes standards which make finding the right one impossible with my current knowledge.The jack is a 3.5 mm 5 pins with microphone and insertion détection.I ask for help to find the right part and teach me more about headphones jack standards.Thank you !
Rpi 3 - damaged processor replacement - Page 1
Forum section: electronics / repair

author: twizzter
author_rank: Contributor
timestamp: December 03, 2020, 07:31:02 pm
content: Rpi IOs are not well protected. My board was damaged - HDMI port failure and stopped working at all after while.Decided to take a risk, go into adventure and bought new processor from our chinese friends.I've replaced chip. No shorts on PMIC, voltages are OK, chip is cold.Did fast check on card area - no shorts, VCC ok, i see signals on SD clk and data pins.Managed to enter "rainbow" screen when booting from card taken from RPI4. Fresh burned image does nothing - black screen, no green led activity.Assuming that chip was a geniune/new and i did my resolder part correctly, is there additional configuration (like ram info?) which is required to be done on BCM2837 in order to boot?In other words - is "factory" first OTP bootloader capable of booting from SD out of the box?

author: wraper
author_rank: Unknown
timestamp: December 03, 2020, 07:37:56 pm
content: There is virtually zero possibility of a new chip, unless it was stolen from factory. I'm surprised you managed to find where to buy it at all. If there are no faulty components on PCB, it should work right away. If voltages are OK, and CPU is known good, I would suspect bad RAM. But from my experience symptoms are more like a bad CPU or soldering issue. Measure current current consumption without a memory card inserted.

author: twizzter
author_rank: Contributor
timestamp: December 03, 2020, 08:06:59 pm
content: Bare board consumes about 50mA on start and stays at 80mA after few seconds.You're right, i can't be sure about chip quality. Especially from ali shady sellers.I'll try to poke chip under hotair and i guess that's last thing i can do before trash slam dunk

author: wraper
author_rank: Unknown
timestamp: December 03, 2020, 08:09:19 pm
content: Quote from: twizzter on December 03, 2020, 08:06:59 pmThat's about what should be normally.

author: YetAnotherTechie
author_rank: Regular Contributor
timestamp: December 03, 2020, 09:35:22 pm
content: there is otp fuse in the cpu, you need to check that they match what rpi uses. plenty of info on rpi site. i don't know how you would program it if you can't boot

author: wraper
author_rank: Unknown
timestamp: December 03, 2020, 09:39:12 pm
content: Quote from: YetAnotherTechie on December 03, 2020, 09:35:22 pmThat OTP discussed on the forums is about USB boot. It does not prevent booting from SD.
R&S CMU200 B95 module removal - Page 1
Forum section: electronics / repair

author: Bravo
author_rank: Contributor
timestamp: October 18, 2022, 09:23:55 pm
content: Hi All,I am considering buying a CMU200 which has a B95 module. I do not wish to use this unit to test cellphones.So I would like to remove the B95 module so that I can measure more than 2 watts. If I remove the B95 module,what else must be done to enable the unit measure up to 50 watts.Any help with this will be greatly appreciated.
R&S CMU200 hangs when the RF generator output is turned ON  - Page 1
Forum section: electronics / repair

author: electronic_guy
author_rank: Regular Contributor
timestamp: January 06, 2024, 05:16:49 am
content: Hi,In my CMU200, when I clicked the ON/OFF button to turn ON the RF generator, the whole thing get stuck and the whole button panel becomes non-responsive. The only thing I can do is long-press the power button to reboot it. I'm not getting any error message on the display since the whole thing gets stuck. When I kept the CMU200 running for a while with stuck generator the fan starts to work with a loud noise. Like its angry for letting it stay stuck. maybe something heats up when it get stuck like that. I'm not sure. So I'm clueless as to why this happens.Please help me to sort out this problem.Thank you.

author: R-1125F
author_rank: Regular Contributor
timestamp: January 06, 2024, 02:53:37 pm
content: Does it run self tests OK? Have you changed the battery?
R&S CRTU-RU Broken - Page 1
Forum section: electronics / repair

author: Finder
author_rank: Unknown
timestamp: February 20, 2019, 11:03:56 am
content: Hi,We have a R&S CRTU-RU protocol tester with this error screen below at work.Does anyone have an idea how to fix this or is it even possible to fix without sending it to R&S?

author: Ice-Tea
author_rank: Super Contributor
timestamp: February 20, 2019, 11:16:44 am
content: Have you tried going through the boot maintenance screen? Tap "Menu Select" once when the loadscreen is visible. You then have the choice to:- Select another version of the SW (which may still be functional)- Or select rebuild SW after board change which may solve the issue...

author: Finder
author_rank: Unknown
timestamp: February 20, 2019, 12:45:29 pm
content: Thaks Ice-TeaI thought I had checked for image backup, but apparently not.I found that there was a backup image that I restored and it works again.

author: girish
author_rank: Contributor
timestamp: August 05, 2020, 09:48:25 pm
content: I have a CMU-300 and the "Firmware update after board change" option worked for me. I also had a loose bodge wire/jumper in one of the digital mini boards.
R&S CRTU-RU/CMU200 front end troubleshooting - Page 1
Forum section: electronics / repair

author: winofi
author_rank: Newbie
timestamp: September 01, 2021, 02:15:49 pm
content: Hey there,today I started to dig into the front end board of my CRTU-RU. It showed slightly off power levels for ever and has the external loop test failing for some frequencies by just a few dB.Recently I tried to use the build in signal generator at lower frequencies and noticed that the sine is clipped for frequencies (not exactly) <10MHz (see images). The clipping occurs on all three outputs for high power levels. For low levels or high frequencies the signal looks fine. So my hope was that there is just a broken power rail causing clipping.After opening the CRTU and tracing the signals I found the issue in the G4C labeled switches. Following the markings they seem to be UPG2179TB ones. Looking at the datasheet they seem to be straight forward 3V SPDT RF switches.Now it gets interesting. All the switches seem to work fine. The signals get routed as expected when changing the output configuration. The datasheet specifies positive voltages to operate the switches but in my device -4.9V are applied to the switches to control them. They seem to work fine with this voltage and the front end self test is happy but the ones after the first amplifier stages of the TX signal seem to clip for high amplitudes (see images, the show the output signals but the waveform is the same directly after the switches). This is true for both TX paths.So my questions are:Do the switches normally work with -4.9V and are broken? Why do two of them break at the same time (both TX paths).Or is the voltage wrong (broken power rail?) and the switches do crazy things on -5V?One thing I also noticed is that the datasheet specifies the outputs require external dc blocking, but there are no dc blockers between those switches (wrong switch datasheet?). I also can not measure any dc leaking out of them.All the botches on the front end picture are factory defaults. The only think I every repaired on the CRTU was an oscillating power regulator in the reference board.Any thoughts and hints are welcome. Thanks in advance.
R&S FSA  - Issues with level glitches of 2nd LO - Page 1
Forum section: electronics / repair

author: induzer
author_rank: Contributor
timestamp: July 27, 2019, 05:55:54 pm
content: Hey forum,i recently got a boat anchor called FSA Spectrum analyzer by Rohde & Schwarz.I bought it with the both analyzer bus cables missing, successfully built the harness myself and was happy to have got a probably fully working unit.Now some weeks later I get constant error messages regarding level error of the 2nd local oscillator.I want to check the single module without the whole unit on the desk but I have no idea where to start checking the circuitry.The signal STL2LO on Sheet 2, section F7, is staggering around by times. Some times is about 120-140mV, the next moment its around 300mV. A lever lower than approx. 160mV triggers internal fault messages.May I start to check the circuitry in the proximity of N2 / V43 on sheet 2 ?Seems to me like the feedback of the output amp.X4 on sheet 1 is the 200MHz reference inputX7 on sheet 2 is the 2.2GHz / 18dBm LO-outputhack on,induzer

author: induzer
author_rank: Contributor
timestamp: August 19, 2019, 07:27:01 am
content: Hi,so I got the problems solved by doing a full alignment of the 2nd LO Module.

author: loulou31
author_rank: Contributor
timestamp: September 29, 2021, 10:27:10 am
content: HiI bought a FSAS spectrum analyser and I would like to know how to have access to the service manual to this instrument.It was in paper form, but I dont know if some has done some scan of it and could be available on CDROM or transfer file, even not free.Thank you and best regardsJean-Louis

author: loulou31
author_rank: Contributor
timestamp: October 08, 2021, 01:18:17 pm
content: Hi,I have found service manual of FSA ( not FSAS that includes tracking generator) on KO4BB site that it is very rich in manuals :http://www.ko4bb.com/getsimple/index.php?id=manualsJean-Louis
R&S FSE boot keys? - Page 1
Forum section: electronics / repair

author: erikka
author_rank: Regular Contributor
timestamp: July 18, 2024, 10:59:06 am
content: My beloved FSE stopped half way during boot.However the boot does succeed when I press HOLD during power on, no clue what this does.After some google search it seems you can do a factory reset by pressing DOT at power on.Is there someone with a list of the keys you can press at power on?And preferably also what they are supposed to do?
R&S FSEB 20 spectrum anaylyzer I2C EEPROM reading error - Page 1
Forum section: electronics / repair

author: maxtee
author_rank: Contributor
timestamp: September 14, 2019, 04:55:46 am
content: Hi,I am trying to debug my FSEB 20 spectrum analyzer. I am getting "Err reading I2C EEPROM on RF_module board" message and the screen shows "UNCAL OVLD" on the upper left of the screen.

author: SMdude
author_rank: Frequent Contributor
timestamp: September 16, 2019, 10:46:39 pm
content: I'd track down the eeprom and check the supply voltages to it. If they are ok, try a little bit of hot air to warm it up and see if it boots then.Failing that, you would need to check that there is communication being sent to it. And perhaps try and read its contents.Disclaimer! I have never worked on this device, it is just the general path I would follow to diagnose/repair it.
R&S FSH-Z2 Cable Pin-Out - Page 1
Forum section: electronics / repair

author: Garnet
author_rank: Regular Contributor
timestamp: July 28, 2020, 12:55:04 pm
content: Can anyone provide me with the cable connections to the 7 pin Binder connector? There are two wires in the cable, red and white. I would like to determine what pins they connect to. TX, Garnet
R&S FSU spectrum analyzer, defective 1st Mixer, help needed - Page 1
Forum section: electronics / repair

author: decker172
author_rank: Newbie
timestamp: January 24, 2025, 12:15:10 pm
content: Hello,i have a defective rohde and schwarz spectrum analyzer FSU. The input mixer, located on the RF CONVERTER BOARD (part 1130.4001) is defective. I need a replacement but i dont know much about this part. Find attached some pictures.RF 20Hz..3.6GHzLO 4628MHz..8128MHzHas someone the schematics or a part list of the RF CONVERTER BOARD (part 1130.4001). Or maybe for the other variants of this board 1130.1990, 1130.4047 and 1130.4647? Can someone help me finding a suitable replacement.Thanks in Advance.Best RegardsDecker
R&S FSW Signal Analyzer_Level LO2 Issue - Page 1
Forum section: electronics / repair

author: seebeck
author_rank: Contributor
timestamp: April 27, 2023, 07:00:15 am
content: Hi Folks，I am working on an RFHW team where I need to use a lot of RF instruments.Our laboratory bought many many RF instruments such as signal generator and signal analyzer from R&S or Keysight.In recent years, Lab have purchased many R&S FSW series signal & spectrum analyzer and they're used to design/measure RF circuits or RF products.Strangely, abnormal rate of "Level LO2" showed a rising with the prolonged period of course, the "Level LO2" is almost like shorthand for "Level of Local Oscillator 2" and the check result was less than the lower warning threshold during "Self-Test" or "Self-Alignment". This problem could have affected the amplitude level's results, including analog domain and digital IQ demodulation.Please see the plots for details as attached.We repaired this problem units back to back, have any others of our friends fared hardly?
R&S HMC8012 - ripped connector and now no connection to main board, measurements - Page 1
Forum section: electronics / repair

author: jmibk
author_rank: Regular Contributor
timestamp: October 31, 2022, 12:20:32 pm
content: Hi,a collegue gave me a HMC8012 to try a repair on. The connector to the front panel was ripped from the main board. There are some pads missing as well.I cleaned everything up, replaced the connector and soldered a new one back on. The missing traces are replaced with some fine transformer wire.It has to work, not to be pretty.After putting the boards together and fixed them in the frame, I tried to buzz out every single connection - they look fine.After powering it on, the LCD shows normal stuff but:- the buttons on the right (V, I, Ohms,...) are verry laggy.- no measurements on the screen- after firmware upgrade, it got stuck by updating the main board firmwareThat means, it has no data connection to the main board (or the mainboard is dead).I checked the voltage and fuses, that power the aquisition circuit - they seem to be ok.Does anyone has a circuit diagram or service manual to the bench top meter to trace out which connections are what on that board to board connector?

author: thm_w
author_rank: Super Contributor
timestamp: October 31, 2022, 10:55:32 pm
content: Unlikely anyone will have a schematic.I see some complex traces like this one, it might pass between and connect to another pad, are you sure you repaired these?
R&S Rohde & Schwartz FSEA30 Calibration error - Page 1
Forum section: electronics / repair

author: Ralsup
author_rank: Newbie
timestamp: June 29, 2019, 09:27:15 pm
content: On the info screen it actually says the model is a FSEA 20 . .I have managed to get the system test to run successfully after replacing the RF EEPROM!The CAL LO SUPP passes successfully but when I run any of the other calibration tests the instrument hangsand I have to reboot upon receiving “Cal abs gain of 5kHz filt”. I have been through the Service manual but am not seeing anything about how to troubleshoot the 5kHz filter. . . If that is the problem . .Thanks for any help on this.I am new to electronics but have been in IT for 35+ years. I listen to Dave all the time!

author: Ralsup
author_rank: Newbie
timestamp: July 04, 2019, 02:26:17 am
content: My extender cable worked for the filter board and inside of the Logamp section the lm224d and the130IB get real hot. I got another cal to work but the RESBW Cal locked up at the same point and there was no activity on the AD811 s in the coarse and fine amp sections. . .

author: CrazyTiger
author_rank: Regular Contributor
timestamp: July 08, 2019, 01:43:52 pm
content: Nice, my favorite spectrum analyzerSince you are opening it up, Here are something that will be useful, its useful for all FSxx series.1. If the unit has a blue panel design (there is a red panel, this is the older version), first of all change the 2x 47uf aluminium electrolyte capacitor on the back light inverter, it sitting on the LCD, after years of running the caps are dry and this will drive the FET to a temperature so high that it will melt the solder and shift the inductor on the other side of the board, causing the LCD back-light to die.2.The IF Filter module, change all the smd aluminium electrolyte capacitor. The ESR will be high3. Power Supply Module, the main capacitor is tied using a cable tie, and I have noticed, they go brittle and causes the cap soldering to become loose over time, so if possible change the cable tie, but its a real pain in the ass to open and power supply module.

author: Ralsup
author_rank: Newbie
timestamp: July 08, 2019, 06:49:45 pm
content: Thank you very much. In order to replace the smd s it would be nice to have a schematic so that the original values could be identified. Do you know where I could find a schematic and associated parts list?

author: DaJMasta
author_rank: Super Contributor
timestamp: July 08, 2019, 11:48:38 pm
content: Not sure if it will give you what you're looking for, but:http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Rohde_SchwarzFSEAB2030 should cover the FSEA and FSEB 20 or 30 variants. SMD electrolytics also generally have their voltage and capacity ratings on them, too.
R&S RTO1000 wonky LEDs - Page 1
Forum section: electronics / repair

author: phenol
author_rank: Regular Contributor
timestamp: December 19, 2024, 09:05:32 am
content: The front panel keypad RGB leds of a rto1000 scope are beginning to fail in quick succession. one or more of the colors are developing intermittent failures. For example, if the green die stops, a yellow button appears red. I pulled the board out and probed around with a dmm in diode mode (compliance voltage is enough to bias the blue die) and confirmed the fault. the issue seems to be lifted bonds; pushing the led "lens" gently temporarily restores operation.The leds are in a roughly 3x3mm six lead package. On the board they are wired in common anode configuration.The problem is that i cannot find a suitable replacement that matches the pinout of the original parts. There are many rgb leds in a similar package but they all have anodes and cathodes on either side of the package in what looks like a standard configuration. This is not the case for the original leds.I procured generic rgb leds of similar size and carefully implanted some on the original footprints under some of the failing buttons with very thin and short jumper wires from the led pins (which i lifted up and trimmed so they don't touch the pads on the board) to the corresponding pad on the board. Needless to say, the process is painstakingly irksome and next to impossible for leds near the encoders, so after replacing a few (ch1 and run/stop) i gave up. The new parts work fine with a slight offset of colors to the cold side.Has anyone had bad leds on this thing or got an idea what will fit without bodge wires?
R&S SM300 sig gen display repair  - Page 1
Forum section: electronics / repair

author: trp806mo
author_rank: Regular Contributor
timestamp: September 12, 2022, 07:45:34 pm
content: Hi,I may buy a SM300 with a bad LCD display. Does anyone know if it can be bought as spare part at a fair price or know the reference in order for me to look for this part ?

author: COSMOS2K
author_rank: Contributor
timestamp: November 21, 2022, 02:26:56 pm
content: Hello:Display reference is NEC NL3224AC35-01Regards
R&S SMATE200A latest firmware/manuals - Page 1
Forum section: electronics / repair

author: drhex
author_rank: Regular Contributor
timestamp: January 25, 2025, 11:14:26 am
content: Hi,I bought a two channel 6GHz SMATE200A for parts but it is fully functional on arrival. I am now torn a bit on pulling it apart. Sadly, R&S in their infinite wisdom won't allow my account access to the firmware and manual downloads as "my profile isn't right". Sigh... Does anybody have the right profile and is willing to share the downloads with me? Please PM.Thanks,Florian
R&S SME03 firmware  - Page 1
Forum section: electronics / repair

author: Jarek
author_rank: Regular Contributor
timestamp: March 07, 2021, 11:06:27 pm
content: Hello everyoneI need the firmware for the SME03 generator.Can someone help me please?

author: picburner
author_rank: Frequent Contributor
timestamp: March 08, 2021, 06:01:36 am
content: This should be it (v4.12?) , however double check it before installing.

author: Jarek
author_rank: Regular Contributor
timestamp: March 08, 2021, 07:53:01 pm
content: Thank you for your answer.I follow the description but unfortunately there is no .hex file in the SMEENG folders.I don't know what I'm doing wrong?Regards Jarek

author: picburner
author_rank: Frequent Contributor
timestamp: March 08, 2021, 09:34:49 pm
content: The firmware is the file "sm3.bin" and it is transformed into sm3.hex by the DOS batchfile "update.bat".Of course, everything must run under pure DOS, not under Windows 10 x64....

author: Jarek
author_rank: Regular Contributor
timestamp: March 11, 2021, 07:04:06 pm
content: Thank you for your answerI used a pure DOS 6.22 computerunfortunately there are still no HEX files to select in the folders.I don't know what to do next.Regards Jarek

author: picburner
author_rank: Frequent Contributor
timestamp: March 12, 2021, 08:01:59 am
content: I don't own this instrument so I can't help you further.The complete service kit for your instrument can be foundhere.From there I got the firmware.

author: Jarek
author_rank: Regular Contributor
timestamp: March 12, 2021, 09:59:55 am
content: Thank you so much for your help.I already have this software from this website.I converted the SO3.bin file to SO3.hex and manually uploaded the software.Unfortunately, damage to the processor board. is morecomplicated. (I bought a damaged one, I thought to fix it, but I think it remains to buy a working CPU board)The damage gives an error message as in the photo.Best regards Jarek.

author: Jarek
author_rank: Regular Contributor
timestamp: March 17, 2021, 11:38:05 am
content: I fixed the generator.It was necessary to replace the EPROM memory from 1024 to 2048 and manually enter the " UPLOAD SMEENG " command in DOS.

author: picburner
author_rank: Frequent Contributor
timestamp: March 17, 2021, 08:37:17 pm
content: Good job!I had read something in the instructions about old pcb with less Flash memory but I didn't know which version you had.

author: Jarek
author_rank: Regular Contributor
timestamp: March 17, 2021, 10:20:56 pm
content: I also did not know what EPROM memory I have until I removed the sticker on it.best regards
R&S SME03 - Power Supply Weirdness - Info Request - Page 1
Forum section: electronics / repair

author: edpalmer42
author_rank: Super Contributor
timestamp: August 19, 2022, 06:15:46 pm
content: I recently picked up a R&S SME03. While checking it out I noticed some distortion on the output at high levels. At levels > +10 dBm, the positive side of the output clips long before the negative side. Symmetric clipping would make more sense. This just seems odd. Yes, I realize that this is pushing the limits of the unit. It gives a warning at levels above +13 dBm but actually tries to put out +16 dBm.Since step 1 of troubleshooting is always to check voltages, I checked the power supply and found some weirdness. All of the output voltages (+15V3, +7V7, +5V2, -15V3, +24V5, +12V, and -30V) are in spec. except for REF3 which is spec'ed at 2V6 - no tolerance, just 2V6. Mine is 4V69. But since all the other supplies are fine, and the unit basically works, I don't know if REF3 is used for anything.I decided to dig deeper and check the circuitry to see if that 4V69 was reasonable. Unfortunately, my power supply is part # 1039.1510.00 and the only copy of the service manual that I can find includes power supply # 1039.1304.00 which is completely different from mine. I checked other units that use the same power supply but came up empty.So my first question is, does anyone have service info for the 1039.1510.00 power supply? If not, does anyone know if the REF3 signal is used by any of the other modules in the SME03?Thanks,EdP.S. I'm aware of the R&S group on groups.io, but there isn't much activity on this series of products so I thought I'd start here.
R/S SMIQ03B  - Page 1
Forum section: electronics / repair

author: comsec22
author_rank: Contributor
timestamp: May 31, 2023, 09:28:25 pm
content: I bought a second hand , down to Warsaw..The booting start normally on the LCD, but after a few second turn off.Any idea ?Thank YouIU0CIX/SP7

author: comsec22
author_rank: Contributor
timestamp: June 01, 2023, 05:01:41 pm
content: Fixed after cleaning and re install the power supply. All good
R&S SMIQ06B - Low Output Power - Page 1
Forum section: electronics / repair

author: energy_hunter
author_rank: Contributor
timestamp: December 23, 2019, 06:38:01 pm
content: I was using my SMIQ06B at +8dBm, 915MHz when the output power dropped to -12dBm. When set to 0dBm (no offset) the output power ranged from -20dBm to -16dBm over the course of 15mins. Has anyone seen this problem? I'll review the other SMIQ06B repair threads that look awesome in this forum. Seems like the final amplifier failed or it may be an attenuator is stuck in a high state. Thanks in advance for any advice.

author: DaJMasta
author_rank: Super Contributor
timestamp: December 23, 2019, 08:08:57 pm
content: If it's not present in the higher frequency bands (above 3.something GHz), then it's probably one of the stages on the 3GHz board - and if it's localized to one area on the 3GHz board, it could be localized to one of the filter paths. Does it show as output unleveled while the error is showing?If the power is varying slowly, or in an analog manner, it's not going to be the mechanical attenuator. That can still leave the electronic attenuators, but those should be in the ALC loop, so the output should show as unleveled if that's the case.
R&S SML-01 signal generator repair Keypad Issue - Page 1
Forum section: electronics / repair

author: jason123
author_rank: Newbie
timestamp: July 29, 2025, 11:38:46 pm
content: Hi there,New to the post - I appreciate the help. Just picked up this signal generator, and it seems to work fine, except for the keypad. It's not very responsive when entering values - the rest of the buttons seems to be tough to respond. The wheel works fine.Is this fixable? I'm assuming it's not normal to press a button multiple times to get a reaction, right?Thanks

author: ondraN
author_rank: Regular Contributor
timestamp: July 30, 2025, 08:24:04 am
content: I had the same problem. The cause is the degraded conductive layer on the buttons. I bought a thin self-adhesive carbon film and stuck it on the buttons. It works perfectly.

author: jason123
author_rank: Newbie
timestamp: July 30, 2025, 11:50:44 am
content: That's a great help, thank you.. Any help of what kind of Carbon film you used? Google search shows many automotive types. Thank you

author: ondraN
author_rank: Regular Contributor
timestamp: July 30, 2025, 01:04:39 pm
content: I used one from a European manufacturer, thickness 0.05mm, 120 ohm. I think, it is not critical. I glued it with polymer glue (Mamut crystal glue). It has been working reliably for several years.
R&S SML-01 signal generator repair questions - Page 1
Forum section: electronics / repair

author: Bargainhunter
author_rank: Regular Contributor
timestamp: September 28, 2023, 09:41:42 pm
content: I am attempting to repair a SML-01 signal Generator. The display is blank and no backlight. The fan runs when I turn it on. Other than that, it appears to be dead.I noticed writing on the inside. On the bottom it was written "Bad Attenuator". I read that these are available on fleabay. Also on the top was written "Bad RF deck - component removed". I do not have a schematic so I'm asking if someone can tell me what component has been removed. I've included photos.Thank you for your help.

author: Bargainhunter
author_rank: Regular Contributor
timestamp: September 28, 2023, 09:42:54 pm
content: Photo 1

author: Bargainhunter
author_rank: Regular Contributor
timestamp: September 28, 2023, 09:43:27 pm
content: Photo 2

author: Bargainhunter
author_rank: Regular Contributor
timestamp: September 28, 2023, 11:04:15 pm
content: Here are the two components that are missing.Can anyone identify the parts and their values?Thank you.
R&S SML01 Repair Log - Page 1
Forum section: electronics / repair

author: CrazyTiger
author_rank: Regular Contributor
timestamp: September 02, 2019, 11:05:03 am
content: Hi,I got this SML01 with an output power down by 13 dB.1.First step, i checked the power supply and everything was doing good and the internal calibration also passed.2. I isolated all the stages to see where the power drops.The output from the output stage to pulse modulator was about 13 dBm when 10 dBm was set, however the output from pulse modulator to Attenuator was about 1 dBm. So that means the Pulse Modulator is dead.Going into Pulse Modulator, I found the output transistor FP2189 had no output, since i did not have one in hand, I swapped with SHF-289, not sure its a good fit, maybe I will order a FP2189 later from Ebay. The transistor is mounted near a big heat sink, so soldering it was a huge pain in the ass.Measuring back the output, with everything assembled, at 0 dBm, my power sensor is reading -0.9dBm, good improvement but its still not within specification. So i looked into the RF Switches:Looking at the RF Switches, each has an insertion loss of about 1 dB, so the signal is reduced by 3 dB, and than the amplifier amplifies at about 2dB, so I am still loosing 1dB, which makes my output lesser by 1 dB. Assuming the attenuator losses is already compensated by R&S when they wrote correction datas.Does anyone know the part number of the 3 RF Switches, so I can check the nominal insertion loss.4227T does lead to a RF Switch but the pin assignment is wrong, in my case PIN 2 and PIN 8 is RF In and Out.To be continued

author: PA0PBZ
author_rank: Super Contributor
timestamp: September 02, 2019, 11:19:11 am
content: Quote from: CrazyTiger on September 02, 2019, 11:05:03 amBut it matches the 1dB typical insertion loss so I think that's close enough.

author: CrazyTiger
author_rank: Regular Contributor
timestamp: September 03, 2019, 12:02:30 am
content: Update:The 3 RF switch are 2x SSW-124 and 1x SSW-108 (W1). It matches the pin configuration, the voltages, and the encapsulation type.http://pdf.datasheetcatalog.com/datasheet_pdf/stanford-microdevices/SSW-124.pdfhttp://pdf.datasheetcatalog.com/datasheet_pdf/stanford-microdevices/SSW-108.pdfBoth are long time obsolete

author: zmetzing
author_rank: Contributor
timestamp: August 15, 2020, 07:42:29 pm
content: I'm also looking for a replacement for SSW-124 in this topic:https://www.eevblog.com/forum/repair/rohde-schwarz-smiq03b-with-error-110-output-unleveled-iqmod-alc-failure/msg3190210/#msg3190210If anyone knows of a source, or a good replacement (pin compatible would be ideal), please post! Thanks!

author: gwoods@a-research.com.au
author_rank: Newbie
timestamp: July 12, 2021, 01:04:14 pm
content: Looks like I have the same fault with two units I just got. Interested to know how you came to the understanding that the OP fet of the pulse unit is a FP2189?At worst, I hope to be adding further repair data here in the near future.Garry

author: KungFuJosh
author_rank: Super Contributor
timestamp: May 19, 2025, 09:59:25 pm
content: UTsource has SSW-124:https://www.utsource.net/itm/p/1901735.html
R&S SML01 sig gen - Page 1
Forum section: electronics / repair

author: akanowitz
author_rank: Contributor
timestamp: September 28, 2022, 10:02:32 am
content: Hi guysHoping you can help. This unit has been in storage for a while and the push button keypad requires extra pressure or sometimes does not recognise the key press. Would it be best to try clean it or replace the keypad. Any deals, help or options of used keypads in good nick appreciated.ThanksAlan

author: Aheld
author_rank: Regular Contributor
timestamp: September 30, 2022, 06:17:03 pm
content: Hi,I just repaired my R&S FSP Analyzer front panel keys.First I cleaned the flex PCB with a contact cleaner. And afterwards I refreshed the carbon pad of the keys with a soft pencil (german: Bleistift).Now, the FSP is working again. I have no idea how long, but it is an easy repair.Hope it helps.Br. Axel
R&S SMR 20 - YTO calibration data missing. - Page 1
Forum section: electronics / repair

author: ThaiGuy
author_rank: Newbie
timestamp: March 07, 2023, 05:16:41 am
content: Hi Everyone,I was trying to figure out how am i going to restore the calibration values using internal calibration routines.I have tried doing the calibration of YTO but still unbale to generate a calibration data.Please helpThank you

author: m k
author_rank: Super Contributor
timestamp: March 12, 2023, 12:58:56 pm
content: I can't even find what YTO is.All I found was YIG filter and its possible YPLL.Maybe this should be in Test Equipment section.
R&S SMS repair, progress made but stuck on Y4 board fault ? - Page 1
Forum section: electronics / repair

author: RichardM
author_rank: Frequent Contributor
timestamp: December 18, 2024, 09:58:02 am
content: Hi All,Made progress on turning 1 x working and 2 x non-working R&S SMS signal generators into 2 x working units. Replacing all the Roederst plastic cased capacitors helped the progress, maybe 10% were bad/leaking. Also, 2x bad 8049 microcontroller chips, one bad TTL chip and 2 x dead P8279 keyboard controller IC's (are there prone to fail ??).I still think I have an issue with the attenuators, but to isolate/troubleshoot/eliminate all the plug in circuit boards I have decided to use my one good unit as the guinea pig. I have been systematically testing each board Y1 to Y8 in the working unit and it appears there is a fault on the Y4 board which is identified as the Phase Control board. Unfortunately, it is marked 302.5890 which is not described in any of the service manuals I have been able to find online. These manuals discuss at length the Y4 302.5819 which looks quite different to the Y4 boards I have. I have found the correct schematic (attached) but not a manual that describes this revision of the Y4 board.Anyway, this is what I am seeing at the RF output on the front- 0.1 to 8MHz output is fine, at MP1 it equates to f(MP1)=(40-fout)> 8 to 19.999MHz output is incorrect, approximately double the frequency20 - 48MHz output is fine>48MHz to 71.999 output is incorrect72 - 99.999 output is correct100 - 111.9999 output is incorrect (shows exactly 132MHz when it should be 100MHz)112 - 154MHz output is correct>154 to 185.999 output is incorrect (shows 139MHz when it shold be 155MHz)186 to 194.999MHz output is correct195 to 199.999 is incorrect (shows 183Mhz when it should be 199Mhz)200 - 214MHz is correct although my scope is limited to 200MHz!!Simply replacing the second Y4 with the Y4 from my working unit fixes the problem, so it must be a fault on the Y4 ? I believe I have tested all the TTL and opamps, and the transistors test ok on diode mode.Any suggestions appreciated as I now begin to test inductors and resistors etc.RegardsRichardrohde-schwarz_sms-2_sch (1).pdf(6681.24 kB - downloaded 19 times.)Y4 Block diagram.JPGI have tried 3 times to make this post, I hope it does not appear multiple times!!
R&S SMS2 service manual quality scan needed - Page 1
Forum section: electronics / repair

author: RichardM
author_rank: Frequent Contributor
timestamp: December 28, 2022, 10:03:17 pm
content: Hi AllI have the service manuals from the Bama site and the others that can be easily found from a quick web search but the schematic for the microprocessor board 302.7057 is unreadable and there’s is no parts list. Hoping someone may have an original copy they would be willing to scan. No luck from groups.io yetKind regardsRichard

author: Chris56000
author_rank: Frequent Contributor
timestamp: January 03, 2023, 06:45:59 am
content: Any good?Chris WilliamsPSJust realised I've attached the SMS "plain vanilla" Microprocessor Board Curcuit 302.7111 which is different – I can just about make out enough from that grotty bloody pdf 302.7057 to attempt to redraw it, but it won't be a quick job – original R & S circuit diagrams are bloody great long sheets!I've not found out a source for the missing parts list yet!

author: RichardM
author_rank: Frequent Contributor
timestamp: January 04, 2023, 07:45:03 am
content: Thanks ChrisAnother Aussie was kind enough to provide both the schematic and parts list in good quality. I don’t think they would mind if I share it if anyone is interested.CheersRichard
R&S SMT03 - no front keys working - Page 1
Forum section: electronics / repair

author: Mlemc
author_rank: Newbie
timestamp: December 12, 2023, 05:39:44 pm
content: Hi there, anyone familiar with Rohde&Schwarz front panel keys which aren't working?I tried cleaning the flat cable and connectors but no result. Unit starts normally and other knobs (brightness, selector) are working.Internal battery is 3,6Vdc so seems normal.Issue popped up after power loss.

author: Jarek
author_rank: Regular Contributor
timestamp: December 12, 2023, 08:23:33 pm
content: HiSometimes one or several key contacts are dirty and shorted and the keyboard does not work.Try to clean the contacts of all keys (silicon pads and tracks).You need to separate them and wash them gently with IPA.
R&S SMU200A (B) Synthesis PLL unlocked - Page 1
Forum section: electronics / repair

author: drhex
author_rank: Regular Contributor
timestamp: September 05, 2024, 03:23:34 pm
content: Hi,I have a two channel SMU200A here where the second channel doesn't lock to the reference signal from the first. I tried another synthesis board, same result, a 10 MHz signal is present at Ref out, 2V PP. Makes me think it isn't the ref output from the first synthesis board, the service manual sadly is very short on information bar "Switch the board". Has anybody seen this before? SSYN A and B are different part numbers, so probably not interchangeable?Thanks,Florian
R&S SMU200A calibration software - Page 1
Forum section: electronics / repair

author: drhex
author_rank: Regular Contributor
timestamp: June 03, 2024, 07:58:17 am
content: Hi all,I have a new (to me) SMU200A which I'd like to calibrate. I think there is a software package similar to the SMIQ which I can't find anywhere. Can someone please share that with me?Thanks,Florian

author: drhex
author_rank: Regular Contributor
timestamp: June 07, 2024, 08:41:00 pm
content: Bump

author: squadchannel
author_rank: Frequent Contributor
timestamp: June 08, 2024, 04:21:33 am
content: QuoteIt was mentioned in the service manual. you might want to contact Rohde.

author: drhex
author_rank: Regular Contributor
timestamp: June 11, 2024, 03:32:41 pm
content: I have a ticket open with Rohde but am not hopeful. There is a tool for download in the software section to adapt levelling which could be the one but would like to know for sure.

author: KeBeNe
author_rank: Regular Contributor
timestamp: June 12, 2024, 03:46:56 am
content: Hi,yes, this is the right software, you need some prerequisites, I quote:"required:Mathworks Matlab Runtime Engine Version 7.14 (R2010B)(must be installed separately)Features:- R&S SMx-K63 User-defined frequency response correction for R&S SMU200A and R&S SMATE200A (requires SMx firmware 2.04.104.45 or higher).- Service frequency response corrections for R&S SMU200A, R&S SMJ100A, R&S SMATE200A, R&S SFU, R&S AMU200A, R&S AFQ100A and R&S AFQ100B.Further details and the devices required for the corrections can be found in the manual.For correct operation, we recommend the following installation sequence:1. driver for the GPIB card.2. National Instruments or Agilent VISA library (only required for remote control via USB or LAN).Recommended versions:- NI Visa 3.4 or higher- Agilent IO library M 01.01 or higher3. Mathworks Matlab Runtime Engine Version 7.14 (R2010B).4. SMx RF and BB correction toolkit.5. NRP Toolkit and the NRP-Z driver for VXI Plug&Play (only required for NRP-Z).Recommended versions:- NRP Toolkit 1.5.7 or higher- NRP-Z VXIPnP driver 1.6.2 or higher."if you have found Mathlab 714, I would be interested in it.Edit:I have found Matlab 7.14, now I could install the R&S programme, to run it asks for the 7.14.SP2 and suitable DLL's...

author: smps
author_rank: Contributor
timestamp: August 24, 2024, 07:49:11 am
content: could you upload Mathworks Matlab Runtime Engine Version 7.14 (R2010B)? thank you

author: drhex
author_rank: Regular Contributor
timestamp: August 24, 2024, 08:16:39 am
content: I got the software to run, PM me for the necessary DLLs. You need a vector analyzer though which I don‘t have (and which would need cal, too). I sent mine off for cal in the end.

author: 2m0jzm
author_rank: Newbie
timestamp: September 01, 2025, 03:25:06 pm
content: Where do you send it off to? how much did it cost?I don't suppose you have any documentation for the SFU?

author: drhex
author_rank: Regular Contributor
timestamp: September 09, 2025, 02:37:12 pm
content: I used Trescal, that was 649,- plus VAT.
R&S SMU200A Protection Level Passwords - Page 1
Forum section: electronics / repair

author: TRN
author_rank: Unknown
timestamp: January 03, 2022, 04:33:08 pm
content: Hi everybody,I have a defect SMU200A, and would like to know if anyone has the Passwords for the protection levels 2-6?The one for protection level 1 is 123456Thanks

author: CDN_Torsten
author_rank: Regular Contributor
timestamp: January 03, 2022, 06:55:55 pm
content: On my SME 03 the passwords are:Level1: 123456Level2: 250751Maybe this works on the SMU200A as well...

author: TRN
author_rank: Unknown
timestamp: January 07, 2022, 04:55:42 pm
content: Thanks, but unfortunately the level 2 password does not work
R&S SMU200A SSYN problem troubleshooting - Page 1
Forum section: electronics / repair

author: aschweiz77
author_rank: Newbie
timestamp: May 22, 2024, 02:03:24 pm
content: Hi all,I'm trying to fix an issue with my SMU200A signal generator.It reports error 50012 "The internal PLL is unlocked due to a hardware problem".I've replaced the SSYN module but the error remains.Does somebody have an idea what could cause this issue?(My plan is to check the input voltages into the SSYN module next.)Thanks,Andreas
R&S URE3 LED Mod - Page 1
Forum section: electronics / repair

author: kjk24
author_rank: Regular Contributor
timestamp: December 30, 2020, 11:20:10 am
content: replaced the 4 Lamps (100mA) with 4 Leds total 30mA constant current now.the old bulps[ Specified attachment is not available ] [ Specified attachment is not available ]
R&S ZVL-6 Power-Off problem - Page 1
Forum section: electronics / repair

author: EB5AGV
author_rank: Contributor
timestamp: October 01, 2025, 01:51:05 pm
content: Hi all,I have aR&S ZVL-6Network Analyzer and there is one thing which I have been unable to get working as it should: the Power ON/OFF key.Looking into detail on the Windows XP embedded system (this unit has XP image v2.21 installed), I have found that there is one suspicious non-working item on Device Manager, called "WDM Front Module Motherboard Driver". When trying to reinstall its driver, it asks for a file namedWdm_FMR.sys, which is not found.I wonder if someone with a similar analyzer could try to locate it and share with me.Of course, if you have any experience with a similar problem, I would be interested to learn how you solved it!Thanks!JOSE

author: sprit
author_rank: Regular Contributor
timestamp: October 01, 2025, 07:36:47 pm
content: Hi EB5AGVI just remember I have a backup of the ZVL model but the suffix after that I don't remember which one it belongs to.... I'm uploading the file, hope it can help you somehow.Feng

author: sprit
author_rank: Regular Contributor
timestamp: October 01, 2025, 07:48:23 pm
content: Here is link to download the backup filehttps://drive.google.com/file/d/14QZR7T-XzQRHreGPi0BNVeHRfX6j1SGw/view?usp=drive_linkThe software I use is Macrium Reflect. Hope it can help.