A strange behaviour when my classic calculator is connected to a wall adapter

[aurelio]

(04-24-2020 06:29 AM)teenix Wrote:  

(04-23-2020 04:27 PM)aurelio Wrote:  Thank-you Tony I'll check asap,, but if the last voltage test yesterday gave me (un plugged) 5,2V for one side and 16,3 on the other, today the situation is worst, 0,3V a 0, 2V, hope to have not created more damages...
I have a couple of questions
1) this charger should have a fuse but I don't see any, is it normal ??!!
2) It is a model with dual-mains-voltage selector, when I opened it the switch fell apart and I'm not sure if I put back in the slider the two contact springs correctly, do you have any pics which shows that selector, I haven't?

As I don't have one to verify, the fuse might be built into the transformer. I don't know if the switch is repairable.

It looks like the switch became faulty. The higher voltage might have resulted from accidently moving the switch to the lower mains input setting, causing the transformer to output a much higher voltage. This can be damaging to the calculator and the charger.

Please be careful when fiddling with mains equipment. It is unforgiving to the unwary.

cheers

Tony

to avoid misunderstandings, the switch is not faulty at all, it is only taken apart and I'm not sure how to insert the springs into putting it back, I guess the flat part towards the slider . The selector was positioned correctly, so I don't think the transformer gave on the output a much higher voltage, but I will take the time to carefully disassemble and test everything.
I found this interesting site where David proposes an alternative schema
The problem is my local electronics shop doesn't have the NTE ones suggested by .

I have found in many other posts regarding the topic also an interesting conversion table provided here by Katie, but unfortunately in our case they have been not enough to find them
Somebody may help in that?


Edit: I found the equivalents, not without emotion, here on the Jaques Laporte site, thank-you Jaques