I received the new PSU board. After I opened the case, I noticed my adapter board is different (see the picture below). What should I do?
I received the new PSU board. After I opened the case, I noticed my adapter board is different (see the picture below). What should I do?
It looks pretty much like my adapter board.
The safest and perhaps most obvious solution would be to ask Owon and let us know what they answer. This board does not have the affected capacitor as a through-hole component (or at all, I'm not 100% sure at the moment), as far as I can see. On the other hand, maybe there are some other "easy" modifications that can be done on it to improve performance.
If I remember correctly, that Russian guy (whose username I can't remember) had similar board and made some modifications to it. That was maybe 6-8 months ago and was a bit more complex than adding a single ceramic capacitor.
It is better to see the rf-loop's mod (version 2b) from Electronics and Owon SmartDS oscilloscopes Forum (http://owon.forumup.com/) but all these mods demands tools and very well smd soldering knowledge.
Resolved by adding an inductor on 5.4V rail as it was proposed by OWON.
I wonder how you managed so well to reduce noise backlight?
Now the main noise from LCD. rf-loop how you fight with this ?
mlhstock,
I looked at one of your previous posts and it states that your scope's serial number is 1303xxx. This means that your scope was built on the 3rd week of 2013. Now here is the puzzling thing, my scope's serial number is 1246xxx, meaning that it was built on the 46th week of 2012, yet, my adapter board is version 3.2. Now, how is it possible that your scope, which was built around 2 months later, has a version 3.0 adapter board. I don't want to speculate, but it gives me an uneasy feeling that there is a possibility that the adapter board in your scope is not the original one. I would very carefully check the scope for any additional telltale signs that may lead you to believe that it may have been altered or refurbished by the dealer before it was shipped to you.
TomC,
I have the same doubt, but I couldn't find any trace of repairing. The dealer told me the scope was shipped directly from the warehouse. Anyway, I asked for a refund or exchange and the dealer is waiting for the response from Owon before he sends me a new version scope. The non-sense adapter card version is one of reasons why I ask for exchange. Another reason is because I noticed the fan is quite noisy. I think people commented that the fan noise should be hardly inaudible, but mine is as loud as my very old Tektronix analog oscilloscope.
we got reply from manufacturer, they said there is no old generation for adapter board, they only have one version
I am really pissed off by Owon's response and ask my dealer give me the full refund, no more exchange. If Owon lied about the adapter board, how can I trust them that they will keep 3-year warranty promise? I don't want to have business with a liar even the oscilloscope has a good price/performance ratio.
I got reply from my dealer and Owon denies there're multiple versions of adapter boards, here's the quote from dealer's emailQuotewe got reply from manufacturer, they said there is no old generation for adapter board, they only have one version
I am really pissed off by Owon's response and ask my dealer give me the full refund, no more exchange. If Owon lied about the adapter board, how can I trust them that they will keep 3-year warranty promise? I don't want to have business with a liar even the oscilloscope has a good price/performance ratio.
But if what they mean is that only one version was used on scopes built during 2013, that would be much more credible.
It seems still have problem to explain the strange combination: S/N 1303xxx, Ver3.0 adapter board inside .......
..... and an instruction of adding 1000pF capacitor for Version 3.2 adapter board.
..... and an instruction of adding 1000pF capacitor for Version 3.2 adapter board.
Who and where have give this instruction: Owon?
Thank you all the guys for starting and keeping this thread!
Below is my experience with "GND noise" mods for V3.0 adapter.
I am also owner of SDS7102. My SDS has OWON's manufacturing date code: 1223.
PSU is PCB-T115-J Rev6. Adapter is CONNECT_V3.0
My original Vp was aprox. 180-210mv.
I've applied DIY mod 2b designed by honoured rf-loop
with necessary alterations for T115-J Rev.6 PSU's and V3.0 adapter's PCB layout.
Upon application of mod 2b for PSU I've got positive effect.
Application of mod 2b for V3.0 adapter probably also had lowered the noise a little bit but not sufficient enough.
At this moment the Vp that I have is 80-90mV, so it still needs improvement.
V3.0 produces TFT LED back light voltage using 5.5V as a source.
V3.2 takes +8.4V from PSU as a source.
This difference affects schematics and PCB routing as well.
I've reviewed this thread and found out two cases of "GND noise" work over V3.0:
- first one was made by the forum member with logname EU1 started at page 45 message Id #664
and finished at page 47 #701 with resolution:
QuoteResolved by adding an inductor on 5.4V rail as it was proposed by OWON.- second one was made by the forum member with logname Siri (he had V3.0) aprox. at page 62
with resolution at page 65 #971
QuoteI wonder how you managed so well to reduce noise backlight?Next was the question from the forum member alexuresp (#972):QuoteNow the main noise from LCD. rf-loop how you fight with this ?I found no answer on this question.
So it looks like that DIY solution on how to reduce noise on V3.0 adapter is yet not fully disclosed at this time.
..... and an instruction of adding 1000pF capacitor for Version 3.2 adapter board.
Who and where have give this instruction: Owon?
Yes, this instruction is from Owon.
TomC, had this instruction from Owon, when he received the new psu board. There was a video how to change the new psu and some instruction how to add this smd capacitor to the 3.2 adapter board between the legs of electrolytic capacitor.
Probably, they believes that the combination of new psu and smd capacitor adding is decreasing the noise at the well level for 2013 versions.
Exactly, version 3.0
An other photo from version 3.0 (from post #928, page 62, Siri's adapter photo), Adapter board: SDS7102_CON_V3.0 (2011.11.14)
It appears the adding inductor at the rail of 5.4V.
Of course the knew about ground issue but if I remember right this inductor adding wasn't for decrease the ground noise but for lcd noise about.
Carrington I see some modification at your board. I have adding some arrows at various areas. Can you give us the information what you have done?
1) you have removed the factory inductor and you put two other smd inductors (what value) and one smd decoupling capacitor...
2) you removed the electrolytic and a smd ceramic capacitor and....
3) probably you have add a decoupling capacitor...
4) you have removed the U13 chip...
5) ??