[Yaesu] Yo-901 monitorscope

[David Aukamp]

I had a 901 monitorscope many years ago and recall problems with the 
reliability of the push button input/function switches. I had 
experience with that type of switch before (with products my employer 
sold) and our solution was to clean & lubricate the switches 
(difficult to do). Try exercising those buttons, perhaps continued 
movement will help clean the contacts. The 901 did come with a user 
manual which may be available as a download. Good luck.   73, Dave  K4QT


>I recently got a 901 monitorscope with the bandscope option, BUT it has no
>raster. I'm suspecting the voltage doubler since otherwise the thing looks
>good, no signs of meltdown etc. I can see filament on, but no trace on the
>scope itself.
>
>Was there ever a service manual for these things, or am I on my own? Any
>generalized faults that I might look at first?   Thanks!  73  John k5MO