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BOSCH GAL1880CV component level repair

So I have this friend who is in construction work. He uses a lot of power tools, especially blue BOSCH akku tools.
One day he mentions that he just bought new GAL1880CV charger. He also said that he has about five of the same chargers that are not working.

As things go, I now have 5 GAL1880CV to repair and I also borrowed that one good charger to use for part database as some of the components were unrecognizably burned.


After I examined all five units it seems they all share the same problem. Standby power supply part is burned in all of them.

In my humble opinion the main culprit behind the problem is transistor Q1, CS1N80 A1H in TO92 case.

As this original component is quite hard to obtain I found a replacement HFU1N80. This unit comes in I-PAK case and it fits the PCB with minimum adjustments.

Damaged components differed through all five units. Some had more burned components than others. But after all the repairs, these were the ones that needed replacement:

position value size/case
R7 82k 0805 (2012)
R8 30R 0805 (2012)
R12 390R 0805 (2012)
R13 6R8 1206 (3216)
R14 4R7 1206 (3216)
R15 4R7 1206 (3216)
Q1 CS1N80  A1H TO-92
Q2 PMBT3904 (W1A) SOT-23
V4 1N4148W SOD123

Primary side component list:

I also took few pictures of the new charger for future needs:

35 Comments

  1. Johnny Johnny

    Exceptional work my fellow enthusiast. I must say, Bosch has one of top quality tools and it is nice to see someone trying to upgrade components for longer usage.

    Best regards, fellow blogger

  2. Geno Geno

    Малко помощ и от мен.

  3. UĞUR UĞUR

    thanx for your beatiful sharing

  4. Максим Максим

    Подскажите R65 и r53 какие это резисторы? не могу заказать ..

    • Lajt Lajt

      Hey Максим, R65 = 20kOhm, R53 = 4,7Ohm

      • Максим Максим

        Супер., Буду искать

  5. Олег Олег

    Дякую, дуже вчасно та актуально.

  6. Mauro Soares Mauro Soares

    do you have the values of C101 and C102
    in R13 what is R?? in 6R8

    • Lajt Lajt

      Hi Mauro,

      Sorry but for some reason i missed your comment 🙁
      Values for C101 and C102 are: 1nF in SMD case 1206 (3216).
      R in 6R8 is Ohm. So that value is 6.8 Ohm

  7. MARTIN MARTIN

    Hello. I have the exact same BOCH GAL 1880CV charger that has broken down. The battery light is coming on slowly. If you have the schematic of this circuit, I would be interested in having this document. Sincerely

    • Lajt Lajt

      Dear Martin.

      I am sorry but I don’t have a schematic for any Bosch charger. All the component info that is on my site was measured by me from a physical device.

      Kind regards,
      Lajt

  8. wulf wulf

    Hello, thanks for offering your experience.
    Do you have a source for buying HFU1N80 or CS1N80?
    Tks.
    Wulf

    • Lajt Lajt

      Hi,
      I got HFU1N80 from aliexpress.
      Kind regards

  9. Ceyfun Ceyfun

    Merhaba CS1N80A1H bulmak imkansız gibi nirşey ama HFU1N80 nereden temin edebilirim.
    Saygılar.

    • Lajt Lajt

      Hi,
      I got HFU1N80 from aliexpress.
      Kind regards

  10. Merti Berg Merti Berg

    hey man, thanks for that blog entry!
    Its also hard to find a HFU1N80. Do you have alternatives for this component?

    • Lajt Lajt

      Not at the moment, no.
      But it seems to be an issue so I will look into it and try to find a solution.

      p.s. I got mine HFU1N80 from aliexpress.
      Kind regards

      • Merti Berg Merti Berg

        Thanks for the reply. Looking forward if there is a solution.
        Greetings…

  11. Dalebroux Michel Dalebroux Michel

    Hi Lajt !
    Thanks for sharing your experience !
    How did you go about removing the protective varnish that covers this PCB ?
    Difficult to make measurements on the components.

    Michel

  12. Lajt Lajt

    Hi Michel,

    I use a Lacquer thinner.
    In my country it is also called “Nitro” Lacquer thinner.
    Just a cheap, universal, type (not for oil based colours).
    It works wonders.

    Cheers

  13. Shlomi Shlomi

    Hello,
    Is there a way to change the input voltage from 110V to 220v?
    Thanks

    • Shlomi Shlomi

      ^^ To make it work with 220v instead of 110v

      • Lajt Lajt

        Hi Shlomi,

        Unfortunately no. This charger is built for one input voltage (region) only.
        It is not a dual power device and doesn’t have any option to be converted.
        Only solution would be conversion transformer (230<->115V)

        • Shlomi Shlomi

          Thanks, I have found manuals for the 1820 charger to be converted into 220…

  14. MARTIN MARTIN

    Hello. I would be curious to know the values of C3 and C4 which drives Q1? Sincerely

  15. MARTIN MARTIN

    Hello. I would be curious to know the values of C3 and C4 which drives Q1? Sincerely

    • Lajt Lajt

      Hi Martin,

      C3 = 1nF
      C4 = 10nF
      Both in 0805 (2012) size

      Regards, Lajt

  16. Doru Doru

    If anyone has a service manual on the manifestation of defects, I would like to help me by posting the list of manifestations or even the manual here. Not having the scheme of this device, maybe I can solve the problem I have.
    Thank you

  17. Nikola Nikola

    Do you know what is marked with “N1”. Thanks in advance

    • Lajt Lajt

      Hi Nikola,

      N1 = SMD marking = GA1 = AZ431A in SOT23

      • Nikola Nikola

        Dear Lajt,

        Thank you really much for your quick response.

        If i could ask you one more question and i will pay a beer 🙂
        What is 8 pin chip neer to R55?
        The other two ICs on that side are “HR1000” and “324a” i don’t need MCU.

        Thank you for your time.

        • Lajt Lajt

          No problem 🙂

          Chip you are looking for is MP6922 in SOIC8 case.

          Cheers

  18. Hello. I would be curious to know what is marked by N1. Thanks

    • Lajt Lajt

      Hi Pera

      N1 = SMD marking = GA1 = AZ431A in SOT23

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