Re: SW monitor prob...

Is the image focused? if its focused (DURING BLOOM) you have XY drive
problem. Check the focus block you could have something leaky make sure
there is no corona. When measuring the HV is it ok while blooming
(loaded) or with no drive. If its fluctuating there is a problem with
the regulator. If its bllooming because of HV drop you will loose focus
also since the focus is just a divider of the HV. Make sure there is no
DC offset on XY input. I havent been following this thread so you might
have already checked but I cant think of what else would make it bloom
other than a CRT with low emision, is the heater got 6.3V on it? and all
the connections good on the socket such as cathode, heater, focus etc.
It definately sounds like a regulation problem. I would buy the
repacement HV kit from arcadeshop. I've installed a few of them and I
think they are well worth it.

Thad

Pinx wrote:

> Right,
>
> now i am really baffled, not only have i re-capped it but now i have
> replaced the transistors at Q901, Q902, Q903, Q904 and replaced the
> Zeners at ZD900, ZD901, ZD902. I have also replaced the resistors at
> R912, R920, R922, R925.
>
> I put my HV probe in with the monitor switched on and set the HV to
> 19500V and still the image on the screen is massive !!!
> Starting to pull my hair out now (not that ive got much) any more
> idea's anyone ? Should the HV be measured with the game pcb unplugged ?
>
>
> Pinx
>
> ----- Original Message -----
> *From:* Pinx <mailto:pinx.32@tesco.net>
> *To:* vectorlist@vectorlist.org <mailto:vectorlist@vectorlist.org>
> *Sent:* Friday, April 01, 2005 7:36 PM
> *Subject:* VECTOR: SW monitor prob...
>
> Hi guys,
>
> just recently the WG in my SW has developed a problem where the
> image is massive, so you cant see it all on the screen. I have
> been told this is "blooming" and so i have just re-capped the HV
> section, but i still have the problem. Is there anything else on
> the HV board i should replace to cure this problem ?
>
>
> TIA
>
>
> Pinx
>

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Received on Wed Apr 6 16:15:54 2005