Re: 13" Amplifone z / Blanking problem.

> The spot killer led is on all the time.

My 2 credits says that's your problem.

If the spot killer is on, it's most likely blanking the beam(s), and you in
turn may have cranked the screen control up to compensate (i.e. so you could
see a picture).

In that scenario (beam blanked and screen cranked up to override), you
_will_ see retrace and the beams will all be at roughly the same level (i.e.
blank level), making the display appear white.

Keep following the spot killer road, and let us know what you find.

-Mark

On Mon, Jun 21, 2010 at 8:40 AM, Kevin Moore <talon.k@gmail.com> wrote:

> Hello Andrew,
>
> Yes I have a pat900. the Pat is using a known good space duel. Have plugged
> a 6100 in it to test the outputs, and the 6100 works fine. I have also
> plugged the 13" into 3 known working machines. Tempest, Star Wars, and Space
> duel. All display the same problem.
>
> I've been working with Rodger on this last night, and there is definitely
> something wrong with the blanking circuit, we just haven't been able to
> determine what yet. The spot killer led is on all the time. The 13" is built
> quite a bit different than a normal 19" so you can't go by the 19"
> schematics.
>
> It got late last night, so we never figured out what was causing the Spot
> killer problem.
>
> Kevin
>
>
>
>
> On Mon, Jun 21, 2010 at 2:53 AM, Andrew Welburn <andy@andysarcade.net>wrote:
>
>> Well, i think the fact that you see all three colours on at the same
>> time and all the retrace lines is because you have no Z at all, AND you have
>> the brightness up way too far...
>>
>> Without any Z's, you should have a blank screen, but you can make yourself
>> feel better that the monitor is not completely dead by turning up the
>> brightness where you'll see the XYpicture of sorts...
>>
>> So, i think you need to be looking at something that is common to the
>> three 'Z' RGB circuits..
>>
>> Because you have an amplifone 13", i might be assuming (maybe wrongly)
>> that you have a pat9000 there... can you absolutely confirm that you have 3
>> good RGB 'Z' channels coming from it and going into the monitor? or are you
>> using something else to test it? scope the RGB Z to make sure.
>>
>> The PAT is about as reliable as any other old videogame, so make sure that
>> you really do have RGB 'Z' going into your monitor in the first place.
>>
>> The fact that you can adjust the intensities of the individual guns makes
>> it all sound liek you either have no RGB Z input, or something early on in
>> the blanking stages is bad, but common to all three.
>>
>> --
>> Andrew Welburn
>> http://www.andys-arcade.com
>>
>> ----- Original Message -----
>> *From:* Kevin Moore <talon.k@gmail.com>
>> *To:* vectorlist@vectorlist.org
>> *Sent:* Monday, June 21, 2010 3:00 AM
>> *Subject:* VECTOR: 13" Amplifone z / Blanking problem.
>>
>> So I've been digging around for the past couple days with this Amplifone
>> monitor with little luck.
>>
>> All the colors are on at the same time, and I'm getting retrace lines.
>>
>> I am able to adjust the colors intensity individually.
>>
>> I can adjust screen, and brightness.
>>
>> Looking at the schematics, it seem the blanking and Z control are one in
>> the same? I'm still not 100% up on vector monitors.
>>
>> Basically what I have is white lines for everything, including the retrace
>> lines.
>>
>> I've checked the RGB transistors on the neck board for possible shorting,
>> causing all the guns to come on all the time, I've replaced all the
>> transistors in the input protection circuit, and the spot killer circuit..
>>
>> I'm at a loss for the moment.
>>
>> Kevin
>>
>>
>

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Received on Mon Jun 21 09:57:16 2010