Products > Test Equipment
Siglent SSG3000X and SSG5000X series RF Signal generators
Nokia6681:
I'm going to carry out more tests today, especially regarding the LF output, but I think I destroyed it with the radio, it's quite possible that I was transmitting with it and forgot to put it back on the dummy load and the generator was damaged as a result .
My dealer said 4 years ago that nothing is normally repaired on this device but that it is either repaired or replaced at a flat rate, but spending over 1000 euros on it makes me reluctant to look for a circuit diagram, but I will do it this afternoon as soon as I can I have time to disassemble and see what generates the output here, the driver stage must still be working because with the full output power setting, around 10-20µV still comes out of the output.
tautech:
--- Quote from: Nokia6681 on August 07, 2024, 12:23:02 am ---I'm going to carry out more tests today, especially regarding the LF output, but I think I destroyed it with the radio, it's quite possible that I was transmitting with it and forgot to put it back on the dummy load and the generator was damaged as a result .
My dealer said 4 years ago that nothing is normally repaired on this device but that it is either repaired or replaced at a flat rate, but spending over 1000 euros on it makes me reluctant to look for a circuit diagram, but I will do it this afternoon as soon as I can I have time to disassemble and see what generates the output here, the driver stage must still be working because with the full output power setting, around 10-20µV still comes out of the output.
--- End quote ---
I'm 100% sure many could benefit from your findings and any imagery of PCB and devices.
Best of luck.
Nokia6681:
YES i will do my best, Pictures i will Record some of this , i hope sharp !
TurboTom:
Reverse power events are the usual culprits of such failures in RF signal generators. Even though virtually all these instruments have some reverse power protection at their outputs, if you happen to supply "enough" power in reverse, these measures either aren't fast enough or just won't be able to cope with the amount of power (some single-digit wattage will most probably be tolerated for a short time, but if it's in the 100W ballpark, it's "Hasta la vista, Baby").
These defects can be repaired in most cases since they are usually very localized, but it's questionable if the instrument is still in spec after the repair and even more so if you will be able to get a schematic. Higher reverse power events also may charr some components and even damage the PCB. I was lucky that two repairs of R&S SM300s with similar problems turned out okay for me (also no schematics, but at least a decent block diagram available). I think the Siglent generator will be easier to repair simply due to the more "organized" mechanical construction. But you will definitely need some experience and RF technology knowledge, and identifying components may be somewhat awkward as well.
Depending on your own experience, it may ba a good idea to disassemble the instrument and post some good, detailed photos of the relevant section here for supportive opinions before starting to actually "rework" the instrument.
Good luck with the repair and all the best,
Thomas
Nokia6681:
Today I removed the mainboard and checked, R620 (49.9R) burned out, but the U70 is still supplied with 3.3V voltage, U46 should get voltage via C755, as does U45 via C754, at least I did with U45 There is voltage on both pins of C754, and all other components that look like this are apparently suppression chokes + C
U70 is the same chip as the Siglent SSA 3021 digital attenuator.
The LF output works perfectly, I have now ordered the H1118.
I was also able to measure the HF at full power up to U39, but after that the HF continues to decrease, but it could be that the U70 is blocking the data due to the 30W that went into it and now other ICs can't switch properly here.
I have to put all the pictures on my server because I can only post 2 pictures in full resolution here
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