3 Nov
2005
3 Nov
'05
5:49 a.m.
You got it, I spent several years servicing CRT devices both TVs and monitors
Don't bother with the resistor, you want to hear the crack of discharge !
It is the sound of success, If I don't hear a crack, I hold the short until
I have completely removed the anode to be sure.
You are only discharging the capacitor formed by the metallic
coating on the inside and outside of the glass. A very primitive glass
capacitor charged to around 20kv.
The anode is isolated from the working end of the tube
and will not heart anything but you if you don't discharge it.
BTW: one hand in the back pocket was what Uncle Sam they taught
us in radar school in the late 60's early 70's.
Now there was some big tube with a lot of crack :)
I wonder how much crack my 38" wide screen CRT TV will make
when I have to work on it some day :)
Have fun, but respect the electrons .... they can bite :)
Bob
On Wed, 2 Nov 2005 21:52:28 -0600, Wolfe, Julian wrote:
Okay, I'm going to try and take another crack at
replacing the flyback on my
VT100. A few months ago I almost did, and chickened out. I'm very very
afraid to do so, as the idea of trying to discharge the CRT scares me very
much. The terminal has been off and disconnected from power for at least
2-3 months now.
This is what I've learned so far from reading:
Put one hand in your back pocket. Use an insulated
screwdriver with
alligator clips on either end, one to the screwdriver blade, one to the
frame (VT100 service manual says the frame right above the CRT is where you
should ground to). Place the screwdriver under the anode cap and touch the
metal connection underneath. Wait till the crackling stops. Remove the
anode cap.
Can anyone reassure me that this is a semi-safe
procedure? Has anyone done
this sort of thing before?
Thanks
Julian