Re: Atari B&W: no HV

Easy test. Check the other voltages for the HV transformer circuit. If you
get the other HV's but no 12KV, then your HV diode is shot. If you do NOT
get the 90VDC and 400VDC (? I can't remember, something like that...), then
you have a problem somewhere else.

---->>>Remember: NEVER, EVER EVER SHORT A B&W HV ANODE TO THE
CHASSIS!!!!!!!!!!!<<<----

  You must use a HV meter or a series of 1 meg resistors (total 10Meg
insulate the suckers!) to discharge the HV anode on the side of the tube.
This is what is killing the HV diodes, getting the anode shorted by a
jumper wire to the chassis common...

John :-#)#

At 10:41 PM 12/05/01, you wrote:
>Hi again everyone,
>
>Awhile back I asked for help diagnosing my Battlezone cabaret's monitor. It
>has yoke chatter and neck glow, but gone no picture, charge on the tube
>face, or hissing/whistling sound that used to come from the HV cage.
>
>A couple of people suspected the HV diode. I'd order a replacement, but at
>$15 each, I'd like make sure I need one.
>
>Is there any way for me to test this diode? I don't have any known-good HV
>cages to put it in.
>
>Besides, I thought that a bad diode caused screen *bloom*, not total picture
>loss. Shouldn't the transformer still be hissing/whistling?
>
>I'd appreciate any suggestions. Thank you...
>
>-Anthony R.
>
>--
>Anthony Ramos________
>600 SE 39th Ave., # 3 \__ aramos@ele-mental.org .. aramos@hyperreal.org
>Portland, OR 97214 \___ information design .. multimedia production
>(503) 236-6303 \____________interactive art .. image synthesis
>
>
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Received on Thu Dec 6 10:41:41 2001