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Aeroflex IFR3413 IFR3414 IFR3416 Signal generator PSU
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G0HZU:

--- Quote from: Mkpirulo on June 17, 2024, 03:27:59 pm ---Hi, Yes that’s what I’m talking about. Send me the model of the supply with the two ceramic resistors, is it on a CSF250 supply.

--- End quote ---

Looking at my records, it's the same CSF250NMML model as the one shown in post #4. The part numbers on the main label are identical.

I don't really want to take them both apart as there are lots of screws in the PSU cover plates but I think both of my CSF250 PSUs have the two large white through hole ceramic resistors. I spent a fair bit of time repairing one of them and there were no large 10k SMD resistors on the underside of the PCB.

I have some internal images of the processor board and the RF board and some of the chips have 2005 date codes. However one PSU was dated 2016 and one was dated 2009 so I suspect both of these PSUs are not the original PSU fitted to the sig gen. Maybe the original PSU had the SMD resistors and it failed in some way?

G0HZU:
I should have some images of the insides of these PSUs somewhere but I probably won't be able to tell if it is the 2009 PSU or the 2016 PSU. I have various cameras here (phone, camcorder, digital cameras) and a several memory cards for two of them. The images should be one one of these devices. However, at least one PSU definitely had the large (white, square, vertical) ceramic resistors either side of the inductor that looks a bit like a transformer. I strongly believe they were both like this.

What is strange is that my PSU date codes are 2009 and 2016  and the PSU in post #4 is dated 2014 and they all have the same part number.
Mkpirulo:
Interesting that psus have the same number but different fabs. All of my PSU have date codes on the green sticker. Mine are 2002 - 2006 vintage. I will be attaching my PSU fan to the fan terminal inside the PSU this is the best location to control PSU temperature. The main 3413 board has no direct feedback on PSU temp.. I will also replace the main boards fan with one step up in cfm. Original fan is the 622HH. The rubber fan mounts can be replaced with like ones from Amazon. One will need to cut the original ones to get the fan out. Attached are some pictures of my PSU, I should say my bad one. I removed the transformer and transplanted it into a working board. The original transformer has the low leakage current that the model number states.

Michael
KD6UJS
G0HZU:
I managed to find some internal images of two of my PSUs. See below.
The image that shows the whole board is from the 2009 PSU as pictured in my original post in this thread.

The closeup image must be from the 2016 PSU as it shows some differences in terms of the red sealant. So this is not the same PSU captured twice.

There is another white ceramic resistor on the other side of the inductor/transformer in both cases.

Mkpirulo:
Hi,

Yes interesting, looks like TDK realized that they had an issue with the earlier models. I would guess that you might see the same temperatures but these can easily handle the temperature. Would be interesting to see how hot the inductor gets between the two resistors. When the unit is sitting in standby mode it’s still warming up but it will no longer burn the board, might heat the inductor. If I had this supply I might still change the fan control configuration just to protect the inductor.

My opinion is that one would want to control internal heat on these obsolete gens since parts are hard to find.
My Agilent E4418B and 53143A have their fans running when plugged in.

Thanks again for taking the time to send pics.

Michael
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