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latigid on

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Posts posted by latigid on

  1.   

    6 hours ago, Smithy said:

    So I've been getting erratic behavior with the LEDs on the switches of the JA PCB.
    I wonder if i made the same mistake soldering the wrong type resistor network?
    The markings on the IC at RN1 are 4816P LF1-103 C1809
    instead of 4816P-T02-103LF.

    I blame myself for not checking the BOM on midiphy and solely relying on the video!

    Thankfully i have a hot air station, flux and solder paste so should be able to remedy this issue.

     

    Yup, that's a common one! Actually Peter shows you the Mouser part number in the video but of course it is not 100% obvious and the part numbers are fairly similar.

    If you used leaded solder, you should be able to remove it easily. Flux can help but it is not 100% necessary. Normally I try for about 300°C and a relatively high airflow for this. If you need higher temperature it will probably be okay for the RN, but you'll need to take care of the other chips, MEC switches and encoder.

    When removing the chip, you might need to wiggle it to get the solder moving. When I do it, I always try to slide the chip laterally along the leads i.e. towards/along the long sides of the pads. This tends to keep the PCB pads intact and doesn't bend the chip leads, hopefully also the leads don't get too messy with solder blobs.

    When done, if necessary clean up the PCB pads with flux/braid to make the surface flat again. If necessary do the same with the chip. If it's not possible to easily get things flat, you can add flux and use the reflow hot air station again.

    Good luck!

  2. You can get plugs of this form that have solder pins, but maybe you want to hack one together with a normal IDC (ribbon) plug?

    Take an IDC and remove the crimping part, then bridge all of the pins required, except leave the supply voltage (or 0V) floating to avoid shorting the power supply.

    Or take a ribbon cable and do the same? Just leave one conductor free. 

  3. Hi Laurent,

    For euroceiver versions 1.5 or older there is a J0 jumper above J19, near the USB.

    There is a jumper on the line transmit board but it basically supplies power over the DB cable, which you don't really want as there is a big voltage drop.

    If grounding is not the issue then I would typically expect power supply (e.g. noisy USB), bad cabling or similar.

    At least you can test directly without the line drivers now the SEQ is open.

    Best,
    Andy

  4. It is important with older euroceiver boards that the J0 jumper is installed. This grounds the two systems. Is yours grounded? 

    To rule out the line drivers, you can bypass them but you'd have to open the SEQ case of course...

    Something else to try would be a different power supply e.g. the USB+5V instead of the regulator etc.

    Best,
    Andy

  5. It should press fit but Peter has a technique to use Scotch tape to hold it in place before lowering the case.

    For me, I slightly roughen the back powder coating (say 120-grit sandpaper) and apply drops of superglue to the corners, away from the edge. Then I carefully place the protector in. If you mess this up though, you'll get a nasty smear on the plastic, so tape is probably safer and sufficient.

  6. We have seen a case where trying to flash with the PA0 port left floating could lead to a corrupted bootloader. Hence the resistors R101 and R102 seem to be very important (that were not installed on your initial build).

    The footswitch/gate LEDs are driven by the buffer chip IC6, so it is expected that they don't illuminate with no inputs.

    Anyway, great that it seems to work well!

  7. If you think an available commercial device can fulfil your needs, then get one! DIY is a different thing. It is potentially more expensive and you have to put in the tools and effort to finish things, but the journey can be very rewarding and sometimes you can obtain tools that are not found elsewhere, often for the very reason that they would be impractical or uneconomical to produce in scale.

    • Like 1
  8. Sorry, the extent to which I could help is already in the posts above. If you have more specific questions there might be others who are more into code modification. But at the moment it is hard to know what step you are on. It sounds to me like you are stuck right at the beginning, and I think it is rather up to you to learn how to modify the code to get what you want out of it.

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