Many thanks for the update.?

My 8643A has displayed this fault code from time to time.

I will check the connectors carefully when I take it out of the rack for oven power supply repair.

Using tinned connectors was very poor form for HP, but of course the detail was not very visible.

By contrast, as a young engineer working on things for the US Gov’t, I was surprised to see that our heatsink blocks were gold plated on all surfaces. There was no electrical or thermal reason for this, so I naively asked my superiors why we spent so much money doing this. This resulted in pitying looks, smiles and the explanation- “When the sponsor visits it helps him to see that he is getting value for money on the contract.” Another lesson learned.

Regards,

Alwyn