They look pretty bright to me for a DVST screen. Your problem looks 'analog', check the character blanking is working, then check the digital to analog, deflection etc.
When you hit the erase what happens ? -pete On Wed, Sep 21, 2016 at 12:07 PM, Mattis Lind <mattisl...@gmail.com> wrote: > I took a look at the Tektronix 4051 that we got a few years back. After > checking the PSU I turned it on and it seemed to start up fine. The machine > responded well to the keypresses but it was hardly readable on the screen. > > Anyone that can give advice on what is wrong and how to deal with it. The > text on the screen is very faint and many characters are scrambled as if > the beam was moving when the points where plotted. When typing there is a > flash of the beam which is then stored as the scrambled text. > > http://i.imgur.com/iQhQW67.jpg > > It probably reads "SYNTAX ERROR" something on the screen. > > My experience with DVST device is minimal. I used an old Philips storage > oscilloscope many years ago but I don't remember the screen to be this > dull. > > It seems like the storage system is not at full output. Unfortunately I am > not getting a good understanding on how the DVST system works from reading > the service manual. What is the purpose of the timers for cursor and > character intensity? > > I am about to check all the voltages related to the display mentioned in > the calibration section of the manual, but just in case someone directly > recognize what kind of problem there is I would be much interested. > > /Mattis > >