Thread: HP 54600b Vertical shift not working

Hi, I have found that the digital encoder pots on these digital scopes are just like potentiometers in that the have a wiping contact which goes round 360 deg, like pots they get dirty. I have used an electronics switch cleaner aerosole to spray inside the pots and this cured the problem. Spray into the opening on the pots and turn the pot round half a dozen times, wait a few minutes until the cleaner dries off then turn the scope on and check the operation. I usually removed the front panel to do this operation. I worked at the University of Canterbury in Christchurch New Zealand for 42 years, I ran the undergrad electronics teaching laboratory in the dept of Electronics and Computer Engineering. I had 33 HP 54600A Oscilloscopes in the lab to look after. Don't use an aerosole switch cleaner that has a lubricant in it this will attract dust and dirt to stick to the contacts.