John Robertson wrote:
> (Posted on newsgroups too)
>
> Doing some repairs to this board (Atari California Speed) but need
> schematics (if possible) to find a problem in the video output section.
>
> If you even only have the video out section and can email me a scan it
> would be appreciated!
>
> Thanks!
>
> John :-#)#
>
Solved my problem, the problem was red worked with no load, but went
away when connected to monitor. Original problem was the video amp
(LT1253) was blown along with a 7407 (both surface mount). After
replacing both had the three colours but no current available on the Red.
The LT1253's colour pinout is Red - #1, Green #7, and Blue #8 - all
three pass through 33R resistors on their way to the JAMMA connector.
The Red 33R resistor was just off the #1 pin of the LT1253, whereas the
Green and Blue were about an inch or so away - closer to the output LC
network.
So my end problem was the 33R Red series resistor was blown (about 5K or
so now) and after replacing Red returned.
John :-#)#
PS if anyone has the schematic for the Seattle PCB I'd still like it for
my files...
--
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
www.flippers.com
"Old pinballers never die, they just flip out"
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Received on Thu Jan 12 20:03:16 2012
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