Re: Messed up my Black Widow

John Huie wrote:
> Hey guys, I've only posted here a couple times because I'm such a newb
> that I am embarrassed sometimes but I thought maybe you could give me
> some pointers on this.
>
> I had a nice working Black Widow game and then acquired a spare
> complete PCB and decided to test it in my cabinet. When I put it in,
> it had issues I won't go into here but I decided to swap my roms from
> my working board onto that one to see if it helped. It did, but I got
> wonky video that's beyond my skill level so I figured I'd just swap
> the roms back onto the fully working board and sell the the other
> board as non working.
>
> However, when I swapped the roms back I got zilch from my original
> board. No LED came on and I wasn't getting +5 at the board. But
> putting the broken board back in still showed life so I knew it was
> something wrong with the PCB that was originally working fine.
>
> So....I screwed something up when I removed the roms or when I put
> them back. Now I've tested resistance between the +5 and the Ground
> test points and they are shorted together. Removing all the rom chips
> leads to the same result....they are still shorted.
>
> I'm stumped about how to figure out where the short is. Are there any
> tips or should I just assume this is once again beyond my skill level
> and send this thing off for repair now?
>

When you say shorted exactly what resistance are you getting across the
5V and ground? Normally this is somewhere around 10 to 50 ohms, but may
be less on some boards.

Also try unplugging the board from the cabinet harness to see if the
resistance changes. Compare with the suspect board too to get an idea of
what a second boards 5Vto ground resistance shows.

John :-#)#

-- 
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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