The NEW Build Your Own Arcade Controls
Main => Monitor/Video Forum => Topic started by: Mauzy on November 21, 2008, 07:25:38 pm
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Someone told me about a year and a half ago how to fix a heater-cathode short in my 19K7201, but I lost the message and couldn't make heads or tails of it at the time. Anyone know of a procedure as to fixing this? I need relatively plain English for this.
(http://img.photobucket.com/albums/v379/tarzanthellama/DSCF3134.jpg)
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At www.randyfromm.com he has podcasts that include the following:
"Shooting the Tube"
"CRT Rejuvenation and Restoration"
"Heater-to-Cathode Short? Put a long in it!"
http://randyfromm.com/amusements/techdept/
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Holy crap. I wish I would have found those months ago...
EDIT: Oh you have to pay for them? Man I'm near broke as it is...
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you could just wind your own , or http://www.mcmelectronics.com/product/33-595
qrz
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Ok, but where does it go?
What would I use to wind? what would I wind around? what am I connecting to?any known tutorial on the web that I can't find for some reason?
Sorry for all the questions but I barely know what a heater and a cathode are, let alone how to fix the problem...
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it is to be connected between the filament winding on the flyback and the fil on the crt.
the original winding is gnd referenced ( connected to chassis ground)
when a heater/cathode short occurs, the cathode is then at ground potential via the dc loop through the
fly.
mcm's iso- block should have installation instructions.
to wind your own secondary , loop 3-4 parallel turns of insulated #22-26 wire around the ferrite core of the fly.
disconnect the filament pins at the crt. connect one side of the new winding to a filament pin.
connect the other to a 2.2 ohm/2 watt resistor . connect the free end of the resistor to the remaining filament pin.
you will now have an ground isolated filament winding negating the short.
qrz