Some new facts. I found leaked voltage trough RL5 contacts, thats affects voltage level on 100 and 1000V ranges. For testing i replace this relay to other one, 1-10V ok, 100 and 1000V are better but still wrong, after applying 24V on input, i read only 16V.. however, on HI testpoint is 0.24V, thats OK.
Some problem with gain???
During the test was damged IC102, was replaced to LM741, wit IC103 as well.. And the message NVM Fail is gone, fortunelly.
Another oroblem is with indication of Overrange, no reaction, only the display freeze, and no response from relays, i have to switch the ranges manually..
Magic?