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||Projects - Gallag Blue
Reproducing Schematics for a Blue
status from 13. October 2007
Entry 18. June 2004
Got a blue Gallag to
repair, that has a
bad video board.
There is no video output at all, but the the
game seems to power up and run in the background.
Looking around for
schematics and repair information I found some nice pages (see the Links Section)
but no good
This is the best drawing I could find, It is hardly readable..
Now, you might say, why one would need a schematic, I have repaired so
many boards w/o any.
The answer is pretty simple, it is a matter of experience (I think),
and I don't have much.
I then looked around to find a free schematics editor and I found one
Eagle Light Edition: http://www.cadsoft.de/freeware.htm
The restriction of only one sheet
bother at all as I wanted to use only one sheet for the Video
PCB anyway and a seperate one for the CPU. The software is easy to use
and is delivered with the
full libraries of components.
By using an Ohmmeter, the original schematics opened in "PAINT" and the
video board on the desk
I started to lookup the traces and made some notes as I identified the
ICs and other components
and the connections between them.
The result looks like this:
Going one step further I created a new drawing in the EAGLE schematics
That's better if you compare it with the original....
...but its going to take a while, I suppose.
If you want to have a look at the current status of the work,
the first link.