New board faults



  • I have just received a duet ethernet board, before doing anything I checked the soldering etc.
    There are 3 faults!

    Capacitor c111 is soldered between one of its connections and one of the resistor next to it.
    Capacitor c104 is only soldered on 1 side as it is misplaced.
    There is a large amount of white paste around the area of c53 c60.

    Is this a problem?

    0_1527685359359_DSC_3572.JPG

    0_1527685379473_DSC_3571.JPG

    0_1527687534880_DSC_3573.JPG


  • administrators

    @micktol That is not great 😕

    I am very sorry you have received a board in this state. Please can you contact your supplier (or me by email if you bought it directly from us) and arrange a warranty replacement. you can reference this thread.



  • @T3P3Tony It never occurred to me to doubt the quality of the board in the first place.

    Now I have looked at it and I found a couple of solder pads where no components are actually soldered to but I have no idea where to check whether this is intentionally or a fault (certainly I had no issues with my board so far, so at least I guess these are missing by definition).
    Instead of spamming this thread could you please tell me where I can find if and what components are supposed to be missing on a Duet Wifi that have declaration on silk screen and solder pads prepared?


  • administrators

    @wilriker There are a number of DNP 0603 resistors, they are annotated on the schematic:
    https://github.com/T3P3/Duet/blob/master/Duet2/Duet2v1.03/Duet2_Schematic_v1.03.pdf



  • @t3p3tony Thanks! I will take my printer apart tomorrow (this is a planned activity 😉 ) and as part of that I will closely examine the board and compare it to the documentation regarding DNP. I do not expect anything unusual as my board worked flawlessly as long as I have it (about a month) but this thread now got me started. 😁


  • administrators

    @wilriker a quick summary to save you time:

    R73, R74,R75,R76 close to the SD card, along with the JTAG port and associated resistors, R35,R49,R52
    0_1527711090805_5455e7de-3412-4c80-9e6c-d381c413cf13-image.png
    these can all be seen in the image above

    R82 and C83 around the ESP
    0_1527711239165_fa8516c1-ee24-4506-a69d-2afedf0e091e-image.png

    and C95 next to the 3.3V LDO:
    0_1527711346248_03f9d793-e545-4912-add0-1d8b1a9cde37-image.png

    HTH



  • @t3p3tony Thanks, that made things a lot easier. 🙂 I can at least confirm now that nothing else is missing.

    Only thing I found is that the large extension header and the VIN terminal block both are not sitting 100% flat on the PCB. This has no functional issues AFAICT but is something the assembling should be advised to look after.

    I will attach photos in a moment.

    0_1527921382847_VIN.jpg

    0_1527921837440_Expansion.jpg

    All pins in both cases are soldered correctly, so again, I see no functional issues here.



  • I have received the replacement board and c111 is misplaced as before, quality control?

    What NOW?

    0_1528111397292_DSC_3580.JPG


  • administrators

    @micktol I have replied to your new thread.


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