Restoring HP-65

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Hello community, ciao Alberto!

I have a similar problem with my 65. The CPU is working - Phi_1 and Phi_2 Signals appear to be correct. Sometimes if i touch the Phi or Sync testpad with the Scope probe, the Display works until I switch off the calculator.

Next week i receive two more Hp-65, then i can exchange parts and maybe i get one unit working again.

I will post my results ...

Greetings
Stefan from Austria

PS: I have a UTD - 1025CL Scope, which is pretty nice for testing.