Re: Tempest foldover on right side

No it's got a P314 minus the board. I did put the LV upgrade on the board
though. I know not related.
Could it still be still be a deflection transistor. I don't have any handy
to try that just yet. I know it was mentioned before by Andrew.

Kevin

On Mon, Dec 21, 2009 at 6:19 PM, Mark Shostak <shostakmark@gmail.com> wrote:

> 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 19:27:20 2009