Electronics > Repair

Siglent spd3303x-e reboot problem

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tautech:

--- Quote from: mawyatt on September 06, 2023, 04:05:33 pm ---
--- Quote from: tautech on June 17, 2023, 07:51:34 pm ---
--- Quote from: Faranight on June 17, 2023, 03:42:10 pm ---Damn! Looks like I got a free ticket to join this club as I've just been hit with the very same issue.
I was trying to do some AVR programming while the unit suddenly rebooted a few times and then started turning off and back on again.
I've had my SPD3303X for a few years, but used it very rarely. Searching on the internet, it seems to be a known problem.

Tautech, I heard you mentioning in another thread that Siglent started replacing these bridges with more powerful versions that are placed off-board.
--- End quote ---
Only member qpit3a's fix is the only one I know of that is done off the PCB.

Siglents suggested fix is a bodge by having an inline bridge shoehorned into a circular bridge footprint.
I suspect they reworked the PCB in later HW revisions to take an inline bridge as there's not much room to work with in the older PCB layout.

TBH I'd make a small birds nest with 4 diodes and run a sleeved + and - back into the existing pads or go with qpit3a's fix with a remotely mounted bridge or maybe try to get one of these little 3A jobbies slotted into the existing footprint:
https://www.retroamplis.com/BR305/en

The application is not very demanding as I believe the original bridge was only 2A rated.

--- End quote ---

Rob,

Did Siglent ever have an official "fix" for this? One of our 3 units just began to hiccup a bit, and considering fixing it before we have to use it again.

Best

--- End quote ---
There is warranty.  ;)

They are not a complex/difficult repair but IMO qpit3a's fix above with an uprated bridge is the easiest if replacing the small circular bridge. Run a red/black pair and an AC pair off the PCB and mount the replacement bridge wherever is most convenient.

There has been a HW change however exactly what has been changed has not been shared.  :(

No doubt the bridge has been uprated/changed so to be more reliable and another display feature has been added; a totalizer readout when in Parallel and Series modes.  :clap:
Unfortunately the latest FW that supports this is not compatible with earlier HW.  >:(

Somewhere IIRC I have a rework doc which when found I'll shoot it to your email.

tautech:
A warranty repair just done...installed the new version control PCB with uprated bridge rectifier.

MathWizard:
My 3303 must be over 3yrs old by now. I had it open already tho. Do these have a fan though ? I can't remember seeing one or ever hearing 1. I hardly ever use much power, so IDK.

But thanks I'll remember to check the rectifier next time I open it up. I bet it's due for a de-dusting too.

I have some quiet computer fans, that would use under 100mA at 5V. Maybe those fan's are too big, but if I had a little one, I'd put it over the control circuits and rectifier.

I'm guessing the main PSU heatsinks have a fan already.

tautech:

--- Quote from: MathWizard on November 19, 2023, 04:24:52 am ---My 3303 must be over 3yrs old by now. I had it open already tho. Do these have a fan though ? I can't remember seeing one or ever hearing 1. I hardly ever use much power, so IDK.
I'm guessing the main PSU heatsinks have a fan already.

--- End quote ---
Yup, smart fan and at low power it will not spin up from its normally very low RPM.


--- Quote ---But thanks I'll remember to check the rectifier next time I open it up. I bet it's due for a de-dusting too.

--- End quote ---
TBH don't worry about it until you have an issue which for some years we never did so maybe just a bad batch of rectifier bridges caused these problems.
I suspect design was using most of the 2A available from those tiny bridges and sus ones gave more failures.
Now with a much better bridge in the redesigned HW there should be now more problems.  :phew:

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