Re: Messed up my Black Widow

Well this email list dings me when a new message comes across. Klov has
very few vector gurus on it. Btw I'm Talon2000 over there.

Kevin
On Jul 1, 2012 6:00 PM, "John Huie" <jehuie@sbcglobal.net> wrote:

> I mean both.....when power is on I get no LED and when I removed the pcb
> from the game, I measure zero volts between the ground and +5 test points.
> Which makes sense since they are shorted now.
>
> I've gone over the board pretty well with a magnifier but I'll do it
> again. And I'll have my son with aspergers syndrome take a look as well
> since he's amazing at finding issues like that. :)
>
> And to be clear, when I'm measuring the resistance and getting a short
> this is with the board removed from the game and all roms removed. Also, I
> neglected to mention that I had also ended up swapping all of the socketed
> chips over at one point so I've checked each of them for bent pins, lifted
> traces, etc. Can't see anything that looks amiss. And I'm still getting
> the short between +5 and ground test points with ALL those chips removed.
>
> I also plugged the board into the game again with all chips removed and
> still no LED or +5 reading there.
>
> I'm thinking maybe I have a hosed socket. Which would be hellish for me to
> find. I don't have a scope but I do have a logic probe. But getting no
> power means that would be worthless I think.
>
> And just an observation....I can't believe how responsive you guys are
> compared to some of the enthusiast forums. I posted on KLOV and got very
> little response to my question. I actually had a bit more on AHA but
> there's very few tech type folks on there. So thank you even if I don't
> get it going!
>
> John
>
> --- On *Sun, 7/1/12, vectorlist-steve <vectorlist@arcadehacking.com>*wrote:
>
>
> From: vectorlist-steve <vectorlist@arcadehacking.com>
> Subject: Re: VECTOR: Messed up my Black Widow
> To: vectorlist@vectorlist.org
> Date: Sunday, July 1, 2012, 3:27 PM
>
> When you say no +5 are you saying there is no +5 voltage measured at the
> board test points or that the power led is not lit?
>
>
> #1 I would recommend taking a few minutes and giving the board a good
> visual inspection.
> - Is there a cap or potentiometer that has been mashed down and shorting
> on another component?
> - Is the crystal and leads intact?
> - Do you see any cracked components or other damage?
>
> #2 Measure resistance across the +5 and GND test points next to the power
> LED with the board disconnected
> - I measured 1.575 K Ohms and 1.578 K Ohms on a second board so they seem
> to be fairly consistent
>
> #3 If you have an eprom programmer verify both sets of roms/eproms
>
> #4 If you have an oscilloscope, logic probe or frequency counter you can
> place on pin #40 of the 6502 CPU to watch for an active low reset
>
>
>
> On 7/1/2012 3:08 PM, John Huie wrote:
>
> Well the boards are both out of the game right now but when they were
> in I checked all fuses and made sure the interlock was on. I could swap
> out the other board and get life.
>
> --- On *Sun, 7/1/12, vectorlist-steve <vectorlist_at_arcadehacking.com><http://mc/compose?to=vectorlist@arcadehacking.com>
> * wrote:
>
>
> From: vectorlist-steve <vectorlist_at_arcadehacking.com><http://mc/compose?to=vectorlist@arcadehacking.com>
> Subject: Re: VECTOR: Messed up my Black Widow
> To: vectorlist_at_vectorlist.org<http://mc/compose?to=vectorlist@vectorlist.org>
> Date: Sunday, July 1, 2012, 2:55 PM
>
> Interlock safety switches on the back door and front coin door in the
> service mode position? ( Pulled all the way out )
>
> If not that, how about a blow fuse? Nine out of ten times it's the simple
> things that folks stumble on.
>
>
>
> On 7/1/2012 2:50 PM, John Huie wrote:
>
> Thanks for all the tips guys. I think I tried everything you have
> suggested so far. Here's the breakdown:
>
> 1) Inspected all chips. There are no bent or broken legs. All came out
> nice and straight.
>
> 2) No obviously damaged sockets. I examined every pin of every socket
> visually with a magnifier top and bottom. They all appear clean and have
> clean solder on the bottom.
>
> 3) Can't see any damage to traces under the chips that could be leading to
> a short. Examined each with a magnifier also.
>
> 4) All roms were put in the correct way around.
>
> 5) When I checked the resistance between Ground and +5, I was just using
> the "Diode" setting on my meter. With chips in or out. On the board in
> question I'm getting an immediate beep and the reading is 0.000. On the
> other board I get no beep and it reads 0.291 resistance. Whatever that
> means.
>
> 6) Neither board is plugged into the harness when I'm checking this.
>
> 7) Thanks for the chart Jordan. Now I see where I screwed up. Step one!
>
> Any other ideas? Oh and David, if you can hit me up privately and let me
> know what you charge to repair these that would be great. I've got two
> that could use repair.
>
> John
>
>
>
>
>
>

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Received on Sun Jul 1 19:03:30 2012