Re: SW monitor prob...

Thad,
you were right, after i had rebuilt the HV section and recapped the
deflection pcb i still had the "LARGE" problem but it was in focus, i had
just bought myself a spare SW pcb set (so i could put my ESB kit on it) and
tried this in the cab, and Bingo ! it was perfect.....
So the fault, was the game boards all along, the thing is, what could be
causing this ?

Many thanx as always for all the advice,

Pinx

oh and Phil, thanx for the spare pcb set :)

----- Original Message -----
From: "Thad Seeberger" <maddthad@jlab.org>
To: <vectorlist@vectorlist.org>
Sent: Thursday, April 07, 2005 2:19 PM
Subject: 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" <maddthad@jlab.org>
>> To: <vectorlist@vectorlist.org>
>> 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: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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>
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Received on Tue Apr 12 15:12:07 2005