Hi, I've a problem with my HP3585A Spectrum Analyzer. The alphanumerics (numbers and letters) are displayed on the CRT in an incorrect way: some of them are incomplete, some are replaced by others, some seem to be distorted. I don't know where to check inside the instrument because I haven't the circuit schematics. I tried to replace some IC's but with no result. Can you help me to find the circuit schematics of the 'digital' units of the HP3585A, i. e. A41, A42, A43, A45 boards? Thanks in advanced. Stefano