5 Mar
2007
5 Mar
'07
1:01 a.m.
David Griffith wrote:
So, I've acquired a Wyse 99gt with no screen burn,
but I need to turn the
contrast up all the way to be visible. Can anyone point me to documents
or other resources on brightening the CRT?
Inside there will be a couple of resistors feeding a high voltage to the
various grids inside the tube. If you can't get a service manual for
this terminal, pretty much any mono monitor's manual will give you the idea.
The resistors tend to be very high value - a couple of meg. These seem
to go high-resistance just for fun, and if you measure them you may find
that they read 10M or more (if your meter goes that high!)
Gordon