Re: Another 19v2000 ? Fixed

Had a rough couple of weeks, but I got back to working on the 19V2000 with
no deflection.

Basic problem, Spot Killer led off, all I could get was a dot in the center
of the screen. No deflection chatter. Turned out that r100, and 101 (the
big 3.9ohm 15w) resistors opened. So I wasn't getting +-34V

I figured if these were out I wouldn't have gotten anything, but it turns
out you will still get a dot, and things look like they are working.

Did the atari field upgrade? replaced the resistors with heavy gauge wire.
Seems to be working just fine.

Kevin

On Fri, Jan 8, 2010 at 4:01 PM, Kevin Moore <talon.k@gmail.com> wrote:

> Currently not at the house, so I can't give you power measurements. But I
> can say that if you unplug the PCB the spot killer led comes on, if you
> unplug x, y, or z spot killer led comes on.
>
> Kevin
>
>
>
> On Fri, Jan 8, 2010 at 3:55 PM, Colin Davies <
> colin.w.davies@btopenworld.com> wrote:
>
>> That sounds ODD to me... as afaik, the spot killer derives its input
>> from the Yoke signal feedback to the amplifier circuit.... unless I'm
>> barking up the wrong tree ?
>>
>> Whats the Power Look like then ?
>>
>> If you unplug the Asty PCB, and power up, does the spot killer come on
>> then ???
>>
>> Cheers, Colin
>>
>> ----- Original Message -----
>> *From:* Kevin Moore <talon.k@gmail.com>
>> *To:* vectorlist@vectorlist.org
>> *Sent:* Friday, January 08, 2010 1:42 PM
>> *Subject:* Re: VECTOR: Another 19v2000 ?
>>
>> There is no chatter :(
>>
>> I was thinking it would be in the spot killer out Z amp sesction, but have
>> yet to find anything.. I'll keep digging..
>>
>> And yes it is an Asteroids boards. :)
>>
>> Kevin
>>
>>
>> On Fri, Jan 8, 2010 at 4:45 AM, COLIN DAVIES <
>> colin.w.davies@btopenworld.com> wrote:
>>
>>> You say you have no deflection, but can you hear the Yoke Chattering ?
>>> (Odd that the spot killer is off) - If so I'd say check the spot killer
>>> output , Z amp section and brighness/contrast..
>>>
>>> Are you using an asteroids board to test it ? - I've found the beam
>>> spends a bit of time in the middle of the screen when not drawing, giving me
>>> dots in the middle on poor screens you see....
>>> Cheers, Colin
>>>
>>> --- On *Thu, 7/1/10, Kevin Moore <talon.k@gmail.com>* wrote:
>>>
>>>
>>> From: Kevin Moore <talon.k@gmail.com>
>>> Subject: VECTOR: Another 19v2000 ?
>>> To: vectorlist@vectorlist.org
>>> Date: Thursday, 7 January, 2010, 23:54
>>>
>>>
>>> Ok, I've got a 19v2000 that out of the blue just started producing a
>>> single dot middle of the screen.
>>>
>>> Spot Killer LED is off, (yes it works)
>>>
>>> But getting no X Y deflection.
>>>
>>> I've read somewhere that cause was probably q503, and 504. Checked and
>>> replaced both with good known. No help.
>>>
>>> Can swap with another deflection board, and it works fine. So game board
>>> doesn't seem to be the problem.
>>>
>>> Kevin
>>>
>>>
>>
>

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Received on Tue Jan 19 18:44:42 2010