Hi Folks, My HP5340A has stopped working at the input to A22 first 2 digits input selector. The U9 Schmitt trigger in a gold can seems to be loading it's input. It is driven by a EECL logic switch which has no output, so I've swapped it with U3 which is an identical switch with the same result, hence my suspicion that is is the next IC that is loading the output. I then tried to simulate an EECL input to U23 output. I think I have damaged this.
My question is are these chips available at a realistic price anywhere or have I now got an HP5340A shelf queen?
Any advice would be gratefully received. Thanks. Chris Hayes. Norfolk, UK.
Chris Hayes