Re: Re: Star Wars Self-Test

With all the time you've wasted piggybacking chips, and agonizing over the self
test, it would have been _MUCH_ faster to just get the $10.49 Radio Shack
desoldering iron, part # 64-2060, and you'd have an answer already. Yeah
it's a radio shack tool, but this one is actually pretty good. :-) Just
let it heat up a good 10 to 15 minutes before you use it. Squeeze the
bulb, press the hollow tip over the pin and onto the pad, when you see
the solder melt, wait 1 or 2 more seconds for the heat to go all the way
through the board, then stop squeezing the bulb and pull the iron away.
Squeeze the bulb hard over a trash can to eject the solder you just sucked,
and repeat the process.

Or get a good pair of diagonal cutters. The cheap bulky cutters suck at
cutting out chips, but a good pair will have the chip cut out in about
1 minute, and then you can use a small needle nose pliers and a standard
soldering iron to pull each pin 1 at a time, then either desoldering braid
or a solder pullit (believe it or not, Radio Shack also has an excellent
spring loaded desoldering tool, # 64-2098 for only $7.99).

If they don't have Radio Shack in Britain, I'm sure you can find similar tools
at any decent electronics shop.

___
Ken

Paul Maddern wrote:
> Okay... With a new 74LS244 piggybacked in 1K a lifted leg looks completely
> different on the scope compared to the original chip... I don't get how
> comes the self test still reports that everything is okay? Am I overlooking
> something here? If I had a desoldering station I'd have replaced it by now,
> but the messiness of clipping it out and the self test are stalling me!!!
>
> Paul
>
> -- ArcadeGeek.co.uk --
>
>
> -----Original Message-----
> From: owner-vectorlist@vectorlist.org
> [mailto:owner-vectorlist@vectorlist.org] On Behalf Of peter jones
> Sent: 07 September 2006 23:15
> To: vectorlist@vectorlist.org
> Subject: VECTOR: Re: VECTOR: Star Wars Self-Test
>
>
> -----Original Message-----
> From: "Paul Maddern" <paul@arcadegeek.co.uk>
> To: <vectorlist@vectorlist.org>
> Date: Thu, 7 Sep 2006 20:01:10 +0100
> Subject: VECTOR: Star Wars Self-Test
>
>
>>Hey All
>>
>>Just a quick question; my Star Wars PCB self-test reports all ROM and RAM
>>okay, but how accurate is this?
>
>
> it can test the program roms by reading them and generating a checksum,
> it can test system ram by writing patterns to it and then reading back.
> the sound board has it's own selftest.
>
> one thing it cant test is the proms, and they fail a lot.
>
> ---------------------------------------------------------------------------
> ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
> ** Please direct other questions, comments, or problems to chris@westnet.com
>
>
>
>
> ---------------------------------------------------------------------------
> ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
> ** Please direct other questions, comments, or problems to chris@westnet.com
>
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Fri Sep 8 14:29:14 2006