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

[aurelio]

(04-22-2020 11:18 AM)teenix Wrote:  

(04-22-2020 10:21 AM)aurelio Wrote:  the 400 uF capacitor is OK, anyway I swapped it, I'll post the pics later.
The voltage is even a little decreased (4,8V)
I have to investigate forward

What is the voltage when plugged into the calculator?

There are only 3 components for the charger logic supply, maybe one has failed or has a poor solder connection.

cheers

Tony

the voltage is 0,3V on both the sides, when plugged into the calculator
I've retouched all the soldering points, they seems good
the voltage now on the "outside pins" is 5,2 V (supply for the calculator's logic chips), but still not enough