Posts: 4,027
Threads: 172
Joined: Aug 2005
Hi;
For sure! Voltage supplied by power components to main circuitry when charger is connected and batteries are not may dammage them. Many threads were developed here containing information about this particular subject. Norm Hill found a zener diode that is suitable for this case when correctly connected to batteries' terminals, mostly if this is done inside the calculator. This zener has an id code and Norm is the best person to talk about this. He is the one who researched and found it.
Of course, using this zener diode is enough to prevent such bad situations. Also, this is not a definitive, permanent solution to allow using AC adapter without batteries in Woodstocks, instead it prevents damage when this happens, for example, in case of bad contact.
Success.
Luiz (Brazil)