13 Feb
2006
13 Feb
'06
11:57 a.m.
At 02:34 PM 2/13/2006, you wrote:
I'm trying to restore an Osborne Executive, but
there seems to be
something wrong in the CRT circuitry. The machine powers up and beeps,
but I see nothing on the CRT. Fiddling with the CRT pots does nothing.
I hear none of the expected noises from the CRT circuitry, nor do I see or
smell anything burnt. Can someone here point me in the right direction?
--
David Griffith
dgriffi at cs.csubak.edu
Just a couple of suggestions, take a look at the back of
the crt and see if the heater is lit. If not tube may be burned out
or heater voltage may not be arriving at the socket. Also try looking
at the face of the tube in a dark room with the brightness control
turned up and switching off. If there is high voltage and the tube is
just dim, you may see the raster collapse to a small dot on the screen.
Regards
Charlie Fox
Charles E. Fox Video Production
793 Argyle Rd.
Windsor Ontario Canada N8Y 3J8
519-254-4991 cfox1 at cogeco.ca
Check out The Camcorder Kindergarten
at www.chasfoxvideo.com