Re: VECTOR: SW monitor prob...

OK, I dont believe you have a HV problem but a XY drive problem. To me 
if it was blooming from HV going low you would loose focus. I would 
check the XY outputs and see if there is a bad connection on the edge 
connector such as the ground. Also measure the voltages on the board 
(game board)for the +/-15 VDC and the XY outputs. I guess it could still 
be the monitor but more than likely something on the deflection board 
not the HV. I would also measure the input voltage AC to monitor and the 
DC voltage of the deflection regulators, I dont remember what it is, 
maybe +/45 VDC or something, if that was amuck could cause your problem.

Thad

Pinx wrote:

> It is in focus,
> just a really large image so some of the image is off the screen....
>
>
> Pinx
>
> ----- Original Message ----- From: "Thad Seeberger" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, April 06, 2005 9:15 PM
> Subject: Re: VECTOR: 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:[email protected]>
>>>     *To:* [email protected] <mailto:[email protected]>
>>>     *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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