Re: Tempest foldover on right side

I was going to ask the same question, but I'd say, if you have a protection
board, just cut the diodes out.

-Mark

On Mon, Dec 21, 2009 at 6:06 PM, William Boucher <boucher@mnsi.net> wrote:

> I may be reaching a bit here, but does your monitor have the built-in
> protection circuitry (P327 board). D807 & D808 are known to create some
> bizarre behavior (folding, walling, linearity issues). Just replace them
> and all of the other similar diodes in the circuit with new 1N4148 type.
> The fact that it is walling on one side actually points to a specific diode
> in the circuit but I don't know which one without going back through all of
> the schematics. It would be better for the long term to just replace them
> all anyway and be done with it.
>
> I have a discussion page dedicated to this problem here:
> http://www.biltronix.com/wg6100_germs.html
>
>
> William Boucher
>
> ----- Original Message -----
> *From:* Kevin Moore <talon.k@gmail.com>
> *To:* vectorlist@vectorlist.org
> *Sent:* Monday, December 21, 2009 3:53 PM
> *Subject:* Re: VECTOR: Tempest foldover on right side
>
> One more interesting thing I just noticed. I increased the bounding box
> size about 1/2 more both sides for a total of 1 inch extra width. The fold
> over stays in the same place.
>
>
> On Mon, Dec 21, 2009 at 2:41 PM, Kevin Moore <talon.k@gmail.com> wrote:
>
>> Been busy, but I had a chance to make a quick video. I taped off the
>> region around the bounding box, so I would know where it was. It seems the
>> problem is about 1/2 inch outside that box on the right side.
>>
>> http://www.youtube.com/watch?v=2kMXHFCB5Zk
>>
>>
>>
>>
>> On Wed, Dec 16, 2009 at 7:31 AM, Andrew Welburn <andy@andysarcade.net>wrote:
>>
>>> Don't always assume that a recently replaced part is 100% good, i would
>>> still replace the transistor with another one as a way to eliminate that
>>> possibility.. you just never know :-)
>>>
>>> Andrew Welburn
>>> www.andys-arcade.com
>>>
>>> ----- Original Message -----
>>> *From:* Kevin Moore <talon.k@gmail.com>
>>> *To:* vectorlist@vectorlist.org
>>> *Sent:* Wednesday, December 16, 2009 1:18 PM
>>> *Subject:* Re: VECTOR: Tempest foldover on right side
>>>
>>> Well the rom set is V2, good point on the boundary limit. I don't recall
>>> off hand, but when I get home tonight, I'll tape off the bounding box on the
>>> screen, and see. Wouldn't think it would be the Deflection trans, as I
>>> replaced all the Transistors with new when I re-capped, and did the LV
>>> upgrades. Don't think I have any V3 roms handy, but I'll check and see if
>>> that makes a difference.
>>>
>>> Thanks for the input, gives me a few things to check.
>>>
>>> Kevin
>>>
>>>
>>>
>>> On Wed, Dec 16, 2009 at 2:43 AM, Andrew Welburn <andy@andysarcade.net>wrote:
>>>
>>>> If its bothersome, you could try replacing the relevant chassis
>>>> deflection transistor, i've seen that before. Tempest unfortunately will
>>>> force the monitor to display vectors way, way outside the visibile screen
>>>> area, later romsets IIRR have a fix for this. Even if your monitor can
>>>> produce a full image, certain parts of the game will overdrive the
>>>> deflection such that the transistors will partially break-down, causing
>>>> other areas of the screen to show foldover like this.
>>>>
>>>> Its not clear if your boundary is inside or outside the real screen
>>>> limit anyway without a photo. you should set the test mode pattern up to
>>>> fill your screen then watch it in game, is the foldover inside this box?
>>>>
>>>> I'd replace the relevant chassis transistor first with a new one then
>>>> observe... Changing the romset to a later revision might also help, but this
>>>> is much more laborious, and is ignoring a weakness in your monitor anyway.
>>>>
>>>> Andrew Welburn
>>>> www.andys-arcade.com
>>>>
>>>> ----- Original Message -----
>>>> *From:* Kevin Moore <talon.k@gmail.com>
>>>> *To:* vectorlist@vectorlist.org
>>>> *Sent:* Tuesday, December 15, 2009 6:53 PM
>>>> *Subject:* VECTOR: Tempest foldover on right side
>>>>
>>>> I've noticed that Tempest has a slight foldover when the player finishes
>>>> a level, and the tube starts coming up. The left side the tube lines go
>>>> infinity for lack of a better word, but the right side seems to fold over
>>>> like hitting a wall, and it creates a straight line. Typically I just adjust
>>>> the picture so that the monitor shroud covers this. Is this normal?
>>>>
>>>> Thanks,
>>>>
>>>> Kevin
>>>>
>>>>
>>>
>>
>

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Received on Mon Dec 21 19:19:36 2009