WTB: HP-65 AC adapter

[Paul Berger (Canada)]

(01-29-2017 02:47 AM)Don Shepherd Wrote:  

(01-29-2017 02:33 AM)Paul Berger (Canada) Wrote:  I would not have thought that a classic charger would care if the battery pack was making contact or not. What I have seen happen to these chargers is wires break in the cable. Does the 65 still work? The classic charger provides a separate regulated +5v to run the calculator when it is plugged in and also an unregulated voltage that charges the battery. Do you have a meter that you could check the voltage at the end of the charger cord?

Paul.

Thanks Paul. No, I don't have a meter. The 65 still works. In fact, I have two 65's and both of them work, they just won't work when the charging cable is plugged in and a batt pack is present. And they used to work when the cable was plugged in to charge the battery. But I suspect the AC adapter was damaged when I went to charge one of the 65 batt packs for 12 hours and the batt pack was not making contact with the prongs in the batt compartment of the 65. I think that must have damaged the AC cable somehow, because the LED on the separate charger does not light up, so I think the AC adapter is faulty. That's why I am looking for a new one.

Don

If it does not work with the charger plugged in that would suggest that the +5V on the charger cable is missing. When you plug the charger into the calculator there is a metal leaf in the socket that gets pushed away from the pins in the connector disconnecting the battery from the the electronics, so if there is no +5V from the charger the calculator will not operate.
One thing that just occurred to me is one version of the charger has a switch to select 110V or 220V input if switched to the 220V position and you plug it into 110V the output may be too low to operate the calculator.