Elektronika MK-52: The MK-61 big brother?

[Adalin]

Hi

Yes I know how fragile the PCB in these machines are, I replaced a defective VFD in a MK-54 a while ago and it turned out alright.

Seems that the VFD display is prone to failure after a while also, the solder contacts are only glued in place on the glass to a painted on conductive path and can fracture the bound and create a high Ohmic contact if you handle the calculator rough, making the display dim or loose numbers.

It seems they used recycled wood and mud from the swamps in the taiga to make the PCB, it hisses and steams when you solder the pads, but if you are quick and steady it works. but yes cutting the legs of the chip is a good way to do it.

I have tried to save programs to different addresses in the eeprom and it seems to save parts of the program on some of them, but it fails to save all steps and creates its own steps and numbers so the program is useless, But I will try to replace the eeprom and see If that helps