Re: black widow xy monitor problem

 I replaced 100 uf cap on HV board. C902 I think.
I checked voltage coming off of pin 1 and pin 8 of the hv board. Im
getting +/-25 vdc instead of +/- 28 vdc. Is that enough? I also checked
pin 5 of the same connector for 180v, but all I get is 171v. Is that
enough? I still have to check Q900 thru Q903. I checked the resistors
around those transistors and they check out ok. Spot killer is not on.
I also checked Q603 and Q703 on the deflection board and resistors
around those. Their all good. Like I said before I checked the
transistors on the chassis and they checked out ok.
But I unplugged the transistors from the deflection board to see what
would happen. I still get the same results with the transistors not
plugged in.
 Now maybe Q605, Q606 and Q705, Q706 are not good, they checked out
alright though.
Any ideas,
Dan Piraino

Daniel Piraino wrote:

>
> I have been trying to get this monitor up and running. But still have
> a problem with the picture only showing a dot in the middle of the
> screen. If I turn up the brightness on the HV, the dot gets bigger. I
> can here some chatter. There is an lv2000 installed. Checked all
> transistors on chassis , checked out good. Checked HV board replaced
> 1.5k resistor that was burnt but it didnt fix the problem. After
> resistor was replaced I forgot to plug in ground on HV board from
> brightness& focus part of the HV transformer. It made aloud squelling
> noise. It then stopped when I plugged it in. I saw some smoke but
> couldnt see anything burnt. Could I have hurt something else?
> Any ideas,
> Dan Piraino
>
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Received on Sun Jul 31 20:44:15 2005