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[Solved] Zamel RNP-01 Exta Free - died again (after the differential tripped?)

pitt66 561 8
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 20877134
    pitt66
    Level 9  

    Below is a picture of the board - everything looks ok, except for the LNK302DN chip (such a voltage converter), which seems slightly smeared at the DRAIN leg:

    Close-up of an electronic board with the marked LNK302DN component, which appears slightly scorched. Image of the electronic board of the ZAMEL RNP-01 transmitter with a scorched LNK302DN component.

    Subsequent questions - is it worth messing around with replacing the LNK302DN? Anyone encountered such problems with ZAMEL transmitters?
    I can order a new one, but I'm afraid a differential will pop up again at some point and I'll have to play with pulling it out of the box again :/

    PS, if the post should land somewhere else, I apologise - I tried to choose as close to thematically as possible.

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  • #2 20877149
    mietek654
    Level 29  
    pitt66 wrote:
    Subsequent questions - it's worth messing around with replacing the LNK302DN
    If it's going to be replaced "on the spur of the moment" it's definitely not worth it....
  • #3 20877159
    rtesadfg56
    Level 29  
    Power it from the power supply, then you can debate.
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    #4 20877184
    kkknc
    Level 43  
    Burnout at the input. The circuit works on a voltage contact. If nothing else has gone then replace. The advice with the power supply as correct as possible. And you may have a faulty RCD. It is dropping zero before phase.
  • #5 20877211
    pitt66
    Level 9  
    rtesadfg56 wrote:
    Power it up from the power supply, then you can speculate.
    kkknc wrote:
    The advice with the power supply is most correct.


    This is what I wanted to do, the question is what voltage to supply? Well and I wanted to pin minus to ground (N) and plus to S (Source) on this LNK302DN, any other ideas?

    kkknc wrote:
    And you may have a faulty RCD. It drops zero before phase.
    I hadn't thought of that! Is there any way to cottage-check this? I don't have an oscilloscope :/
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    #6 20877223
    rtesadfg56
    Level 29  
    @pitt66 Power supply to main circuit. See from 5V, but should be >12V.
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  • #7 20877292
    pitt66
    Level 9  

    rtesadfg56 wrote:
    @pitt66 Power supply to main circuit. See from 5V, but should be >12V.


    I don't quite catch which is the main circuit - but I plugged in with about 8V under the LDO (LE33) for input, and then by shorting on the Opto contacts I was able to control the lamp (the status LED flashed and the receiver received the command). Pictures for posterity, maybe it will make it easier for someone:

    Close-up of a circuit board with electronic components, including an LDO LE33 regulator. Image of a PCB with markings and electronic components.


    So I conclude, that you could try to replace the LNK already a little less on the stick? The diodes on the input look ok (checked with a 30 zeta meter, one conducts the other not).
  • #8 20879106
    pitt66
    Level 9  

    kkknc wrote:
    And you may have a faulty RCD. It drops the zero before the phase.


    Profactorily, and having this suspicion, I ordered a type A RCD from a normal company i.e. Eaton, until now there was some Chinese LC Tec.

    kkknc wrote:
    The circuit works on voltage contact.


    If by "on contact" you mean that on the click of a switch then no - it is powered all the time, and passing a phase to these switch ones causes a signal to be transmitted (that's what this opto is for).


    To sum up, I fixed it and it works. I replaced the LNK302DN and the 47ohm resistor (it had no external signs of damage, but it was burned out - not conducting at all). The total cost of the repair was LNK for about 4PLN at a local shop + resistor + some fun soldering = worth it :)

    Electronic circuit board with LNK302DN chipset and 47 Ohm resistor. .
  • #9 20879551
    pitt66
    Level 9  
    Closing. Thanks for your help!
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Topic summary

The discussion revolves around the malfunction of a ZAMEL RNP-01 in-box transmitter, which failed after the differential circuit breaker was triggered. The user experienced a previous failure and had the device replaced under warranty. After five years of use, the transmitter stopped sending signals to the receiver following a power interruption. Responses suggest that the burnout may be due to voltage surges when the differential is reset. Recommendations include testing the device with a power supply, replacing the LNK302DN component, and checking the RCD for faults. The user successfully repaired the device by replacing the LNK302DN and a burned-out resistor, confirming its functionality afterward.
Summary generated by the language model.
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