Assessing and Repairing a Defective MacAllister Screwdriver Battery Charger

Question

Hello, My MacAllister screwdriver battery charger broke recently. I have no experience in repairing this type of equipment, but I opened it, checked if there was voltage at the end (on the contacts where the pins of the battery go) and it is not. The diodes are off, the battery is not charging...

wojtek 9007 · Accepted Answer

Hello - please check with a multimeter this element marked on the PCB as F1 (it is a fuse). Added after 52 :

automobilklub · Accepted Answer

Check the battery again. If there is no voltage on its contacts, the charger may not activate.

wojtek 9007 · Accepted Answer

The fuse should be checked with a multimeter (diode, buzzer). If the fuse is good, please measure the voltage on the electrolyte maybe (320 V) - I noted in the photo. Added after 51 :

bearq · Accepted Answer

Because the converter does not start, did you check the power supply of the chip?

bearq · Accepted Answer

You check what the scalak is, look for its documentation on the internet from which you can find out which outputs are responsible for what. You check the power supply of the chip and if you do not have it, you are looking for a power problem by deduction. If the power supply is only an oscilloscope and measurements ...

bearq · Answer

No, you are not able to fix it yourself with home appliances

margosmat · Answer

@jtek 9007 I checked the fuse and the voltage is approx. 10 V weaker than at the input (203-4V, at the input 213-214V). @automobilklub There is a voltage of 14.75V at the battery contacts, so probably approx.

robokop · Answer

You are not even able to properly check the fuse. You know what kind of animal this is, that fuse or not?

margosmat · Answer

@jtek 9007 Ok thanks for your patience. I checked the fuse, it shows 1, it is not approaching 0 and there is no voltage on the electrolyte.

marian1981.02 · Answer

So what is the conclusion of this? Is this fuse good or not good?

margosmat · Answer

Forgive me for not answering for so long, but I waited for the fuses I ordered. So I replaced the defective fuse, the charger still doesn't start. I checked the voltage on the electrolyte and it is still gone.
@bearq - could you explain how to check the power supply of the chip or this converter? As for whether the current goes to the plate then yes.

marian1981.02 · Answer

How do you want to check the power supply of a chip if you write that And you boy, finish the story because you can see that the author is green in the subject.

Anonymous · Answer

How does a good fuse behave when checked with an ohmmeter or tester? I guess you have to start with that? The new fuse is probably blown already.

margosmat · Answer

Unfortunately, I could not find the scaler diagram, and on Castorama's website I got information that the charger can be purchased separately, so I close the topic. I would like to thank everyone who tried to help and devoted their time. For those who came to the forum Beginners Repair to mock and write that someone is green in the subject, I suggest finding another hobby. I hear masturbation is a nice thing

[Solved] Assessing and Repairing a Defective MacAllister Screwdriver Battery Charger

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