Re: Atari B&W: no HV

Thank you for the suggestion. I will check the other incoming/outgoing
voltages and report what I find.

As for shorting the HV diode to the chassis, that sounds really
dangerous...I would never even consider it. In fact, I'm going to test
everything _else_ first. Thanks for the warning, though.

on 06 12 01 10.20, John Robertson at jrr@flippers.com wrote:

> 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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>

-- 
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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