Samogon, it fails after first calibration step described in manual... with "Cal error, CVR source gain" and I don´t really understand what does it mean...
Hexley, yes I removed it. If not you can´t enter in calibration menue at all.
hardcoreman, I have installed new empty NVRAM and it is calibration memory, so it should be erased.
I have checked the relays in first channel by applying 5V signal with 40mA current limitation, so all relays are OK...
In the service manual there is no instructions about what user should do after changing NVRAm memory chip.
If someone changed NVRAM in tektronix scope please tell me about your experience.