HP- 67 1706A04606 - keyboard repaired weird behavior

[albertofenini]

Hi everyone,

this has also been fixed, following all the advices we replaced :

new 2,2 microFarad capacitors (3)
new 22 microFarad capacitor
new 47 microFarad capacitor
some old but working transistors 4-071 and 4-668 for the power supply
some old but working 1818-0231 and 1818-0232

however with no improvements

then we replaced the actual 1820-1596 with a known working 1820-1956
and finally it fired up immediately and worked correctly

Apparently, the old ACT Chip was bad in the meaning the it needed few minutes of
warming in order to work properly ....

Again thanks everyone for the support and the endless suggestions
take care !!