Re: Weird distorted shapes

Here is a picture of the crosshatch screen...
https://www.dropbox.com/s/6l4uamqf45h4u50/2014-03-04%2006.29.48.jpg

Here is the BIP screen, you can see it is spot on but the text is all crazy
https://www.dropbox.com/s/anxwxpfikbdh3ak/2014-03-04%2006.37.16.jpg

A close up of the text on the crosshatch...
https://www.dropbox.com/s/753vqr4w9yyxet8/2014-03-04%2006.37.38.jpg

On Tue, Mar 4, 2014 at 6:56 AM, Joel Griffin Dodd <griffindodd@gmail.com>wrote:

> Cross hatch looks good and the BIP is spot on.
>
> I hooked up my XY scope and zoomed in on the letters on the cross hatch
> screen. Pic here...
>
> https://www.dropbox.com/s/ioixnfrai1h4hq6/2014-03-04%2006.43.38.jpg
>
> The letters are well formed and not all squiggly. So we can rule out the
> game boards and power supply.
>
> We already did non inductive resistors with no change.
> On Mar 4, 2014 12:10 AM, "Simon" <simonjhanlon@btopenworld.com> wrote:
>
>> What does the test mode crosshatch look like? Can you take a photo of it
>> ?
>>
>> Sent from my iPhone
>>
>> On 4 Mar 2014, at 04:15, Joel Griffin Dodd <griffindodd@gmail.com> wrote:
>>
>> Jimmy,
>>
>> I tried the boards on a 6100 from my Space Duel, there was very minor
>> distortions but nowhere near as bad as this. All my text looks like it's in
>> an Asian font lol
>> On Mar 3, 2014 8:10 PM, "Joel Griffin Dodd" <griffindodd@gmail.com>
>> wrote:
>>
>>> I rearranged all of my boards and wiring harness to make sure nothing
>>> was to close together but no change. The only other obvious power issue I
>>> can see is that I only have 2 prong power outlets in my shed, so I'm not
>>> getting a proper ground. Also I have fluorescent strips in the shed running
>>> off the same circuit, do you think they would cause an issue?
>>> On Mar 3, 2014 8:04 PM, "Joel Griffin Dodd" <griffindodd@gmail.com>
>>> wrote:
>>>
>>>> I have a dual channel scope but I'm very green with it. Should I just
>>>> be looking at the XY output the way I would get a picture on the scope or
>>>> use it in a different way.
>>>> On Mar 3, 2014 6:52 PM, "Jimmy Ipock" <jipock@gmail.com> wrote:
>>>>
>>>>> A dual channel oscilloscope might be useful here. It would show noise
>>>>> in the x and y signals.
>>>>> On Mar 3, 2014 8:31 PM, "Joel Griffin Dodd" <griffindodd@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> We've already tried the non inductive resistors but the problem
>>>>>> remains. Anything else? Someone mentioned AC leakage into the XY amplifiers
>>>>>> although the distorted shapes are stable, they don't flicker.
>>>>>> On Mar 3, 2014 4:24 PM, "Andre Huijts" <a.huijts@upcmail.nl> wrote:
>>>>>>
>>>>>>> Yes, and I got that answer from Jed Margolin, he should know :)
>>>>>>>
>>>>>>> Verstuurd vanaf mijn iPad
>>>>>>>
>>>>>>> Op 4 mrt. 2014 om 00:29 heeft Joel Griffin Dodd <
>>>>>>> griffindodd@gmail.com> het volgende geschreven:
>>>>>>>
>>>>>>> Also, not sure if it is related or not, but when the screen is
>>>>>>> 'full' with objects, like the high score table I get a noticeable 'flicker'
>>>>>>> to the whole screen, like it is struggling to update, the flickering is
>>>>>>> about 10 cycles per second (by eye) is this normal for Star Wars?
>>>>>>>
>>>>>>>
>>>>>>> On Mon, Mar 3, 2014 at 3:26 PM, Mendel Pearl <mypearl@dds.nl> wrote:
>>>>>>>
>>>>>>>> Some AC on your DC rails should not matter for the output amp
>>>>>>>> anyway.
>>>>>>>>
>>>>>>>>
>>>>>>>> On 4-3-2014 00:25, Joel Griffin Dodd wrote:way
>>>>>>>>
>>>>>>>> OK I can try moving things around a little tonight and see what
>>>>>>>> effect that has.
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Mar 3, 2014 at 3:21 PM, teeray <teeray@earthlink.net>wrote:
>>>>>>>>
>>>>>>>>> use a scope to check the amp power supplies for AC ripple
>>>>>>>>> and make sure all of the high voltage wires are as far away from
>>>>>>>>> the board
>>>>>>>>> as possible. Also make sure the X and Y input wires are away from
>>>>>>>>> any high voltage.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> -----Original Message-----
>>>>>>>>> From: Joel Griffin Dodd
>>>>>>>>> Sent: Mar 3, 2014 6:13 PM
>>>>>>>>> To: vectorlist@vectorlist.org
>>>>>>>>> Subject: Re: VECTOR: Weird distorted shapes
>>>>>>>>>
>>>>>>>>> How would I check for that Tim?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Mon, Mar 3, 2014 at 3:11 PM, teeray <teeray@earthlink.net>wrote:
>>>>>>>>>
>>>>>>>>>> Looks like you have some AC voltage getting into the X and Y amps.
>>>>>>>>>>
>>>>>>>>>> Tim
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> -----Original Message-----
>>>>>>>>>> From: Joel Griffin Dodd
>>>>>>>>>> Sent: Mar 3, 2014 2:19 PM
>>>>>>>>>> To: vectorlist@vectorlist.org
>>>>>>>>>> Subject: VECTOR: Weird distorted shapes
>>>>>>>>>>
>>>>>>>>>> Hi all,
>>>>>>>>>>
>>>>>>>>>> Doug and I have been working on building a reproduction 25"
>>>>>>>>>> Amplifone using a new deflection board design from an Australian designer
>>>>>>>>>> (Dez). Overall it's working extremely well, but we are seeing some odd
>>>>>>>>>> distortion in shapes. It's most apparent in circles, but can been seen in
>>>>>>>>>> most shapes on the screen where letters look a little warped and joins
>>>>>>>>>> between vectors overlap.
>>>>>>>>>>
>>>>>>>>>> I know even 6100 deflection boards do have a little of this,
>>>>>>>>>> but it seems to be more apparent on our board.
>>>>>>>>>>
>>>>>>>>>> Here's an extreme example of the death star on the star wars
>>>>>>>>>> start game menu...
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> https://www.dropbox.com/s/i1r76l4dif9vv2w/2014-03-02%2020.10.19.jpg
>>>>>>>>>>
>>>>>>>>>> Doug mentioned that he thought it may be down to the tolerances
>>>>>>>>>> of some of the new components we are using on the deflection board. I
>>>>>>>>>> wanted to throw it out to the group to see if anyone has any ideas of where
>>>>>>>>>> we might look in the circuit to investigate this odd issue.
>>>>>>>>>>
>>>>>>>>>> Joel
>>>>>>>>>>
>>>>>>>>>> ---------------------------------------------------------------------------
>>>>>>>>>> ** Unsubscribe, subscribe, or view the archives at
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>>>>>>>>>> comments, or problems to chris@westnet.com
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> ---------------------------------------------------------------------------
>>>>>>>>> ** Unsubscribe, subscribe, or view the archives at
>>>>>>>>> http://www.vectorlist.org ** Please direct other questions,
>>>>>>>>> comments, or problems to chris@westnet.com
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>

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Received on Tue Mar 4 11:54:43 2014