"Charles Schuler" wrote in
:


"egb" wrote in message
oups.com...
I bought a used non-working 7905. Have almost everything fixed except:


When increasing the trace brightness to an acceptable level there is a
halo present. It is not a uniform halo, but is displaced slightly up
and to the right of the trace, probably 20% brightness at normal
brightness of main trace.

Are you sure all of the CRT voltages are within specifications?




Yes,like the cathode V,-2960V IIRC.(which also determines the anode V)
The thick-film network can go out of spec.(no new replacements available)

It could also be a electron gun element knocked out of alignment,and part
of the beam striking it and diffracting.
Thus the test I mentioned for geometry in another post.

--
Jim Yanik
jyanik
at
kua.net