HP-35 Power Supply Waveforms

[albertofenini]

ciao Tony,
we have tried several zener all with a voltage ranging from 5,6 to 5,9 volts and the above values are persistent :
Vcc : 9,67
Vss : 7,21
Vgg : -15,47
consider + or - 0,5 V testing the different zener.

at the beginning when the Voltages Vcc, Vss and Vgg were almost the double of the expected values, the zener was about 9 V
take care and if you have any suggestion, please let us know !