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Bosch AL 1115 CV Charger Burnt Resistors: Seeking Values for Replacement

BANANvanDYK 28550 6
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 11141372
    BANANvanDYK
    Level 42  
    Hello.
    A colleague burned down the new charger for the Bosch cordless screwdriver. I would ask for the value of the burnt resistors - if someone has the same, let them check. The AC adapter burned out when the battery was disconnected.
    This equipment was purchased in Germany and is not covered by the warranty. The new one costs around PLN 150.
    Bosch AL 1115 CV Charger Burnt Resistors: Seeking Values for Replacement Bosch AL 1115 CV Charger Burnt Resistors: Seeking Values for Replacement
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  • #2 11150942
    PtasiorWro
    Level 28  
    Hello.
    Equipment purchased in the EU is subject to warranty in each country, provided that the manufacturer has an authorized service in the country.
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  • #3 11152323
    BANANvanDYK
    Level 42  
    A colleague explained that a charger or a screwdriver with this charger was added as "free" to the tools that were bought. The charger is not included in the invoice anywhere, so theoretically there is no basis for accepting the warranty. Anyway, another colleague from work tried to repair this charger. A new fuse has been installed, a transistor and resistors selected "roughly" - 10k or 100 ohms. Of course, after switching on to the network, the fuse shot out.
    I found an identical topic on a Russian forum: http://www.mastercity.ru/showthread.php?t=152170. I suspect that it may be a factory defect, as in the failing speed regulators in the new Dremels ...
  • #4 11175933
    BANANvanDYK
    Level 42  
    I have drawn a diagram of the power supply circuit - I am giving my sketches. Items with the crossed out "X" were damaged.
    Bosch AL 1115 CV Charger Burnt Resistors: Seeking Values for Replacement
    It turned out that the guest had bought two such screwdrivers and has a second charger in working order. I asked my friend to provide it to check the value of the burnt resistors. When I have it and know their resistance, I will give it of course. Only then will I start repairing this charger.
    I am asking the specialists from switching power supplies to check if there is something wrong in this system solution, that the power supply has burned in such an unexpected way.
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  • #5 11203458
    mirolek2
    Level 11  
    Hello.

    I have a similar problem as my friend. I damaged this charger and some elements are completely burnt. I have already figured out most of the photos, but I have a problem with the R1 element. If it was possible, I would ask you to check it and provide its value.

    I also found this page: Link
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  • #6 11210535
    BANANvanDYK
    Level 42  
    R1 - NTC 150-7 thermistor, that's what it says. Resistance at room temperature approx. 20-22 ° 16.5 ohms. When heated with a dryer, it dropped to 4 ohms.
    Thanks for the link. I will wait for a working charger, if I have time, I will try to repair it.
  • #7 11610088
    BANANvanDYK
    Level 42  
    I consider the topic outdated.
    A colleague took the charger to fix it, after replacing the elements and connecting it to the mains, the power supply burned again.
    There was also a combination of feeding power to the charger from another power supply (transformer). I don't even know if it worked.
    I close.
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Topic summary

A Bosch AL 1115 CV charger for a cordless screwdriver was damaged, leading to a request for the values of burnt resistors for replacement. The charger, purchased in Germany, is not under warranty as it was included as a free accessory with tools. Initial repair attempts involved replacing a fuse and selecting resistors, but resulted in further damage. A user provided a schematic of the power supply circuit, indicating burnt components. Another participant identified R1 as an NTC thermistor with a resistance of approximately 20-22 ohms at room temperature. Despite efforts to repair the charger, subsequent attempts to power it resulted in further failures, suggesting potential design flaws in the power supply.
Summary generated by the language model.
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