Hello and asking for help with HP 67 power unit

[Tapti]

Hello Tony,
thank for your fast reply. For the test I used a stabilized lab power supply connected to the battery terminals, not the original power supply. In the meanwhile I do own one. But actually I got a problem with the german parcel service (DHL). I sent the unit to somebody, who adrvertised being a specialist for the repair of HP calculators. Unfortunetly at the time when the parcel arrived at him he obviously wasn't at home. So the parcel was delivered to the local post office. The guy refused to go there an fetch the parcel. So for the moment I have a running application at DHL searching for the fate of the parcel. Hopefully I hear something from them in the next few days. I will check your proposals as soon as I got my HP. back.
Greetings
Stefan