Re: [N8VEM: 10602] SCSI2IDE board ready for firmware

[Andrew Lynch <lyn...@yahoo.com>]

--- On Mon, 7/18/11, Douglas Goodall <douglas...@mac.com> wrote:

> From: Douglas Goodall <douglas...@mac.com>
> Subject: Re: [N8VEM: 10602] SCSI2IDE board ready for firmware
> To: n8...@googlegroups.com
> Cc: "Andrew Lynch" <andrew...@sbcglobal.net>
> Date: Monday, July 18, 2011, 5:46 PM
> Hi Mark (and Andrew),
> 
> On Jul 18, 2011, at 1:19 PM, Mark Martin wrote:
> 
> > Douglas et al,
> > 
> > Thanks for forwarding the picture.  It's been
> very valuable to us.  
> 
> I am having the time of my life working with my new
> colleagues
> (that's you). Anything I can share that makes things easier
> is a
> priority with me.
> 
> > My wife has all but the SD card, the battery holder,
> and P7 in place.
> > 
> 
> I m having a major problem dealing with the SD connector,
> both on the
> SCSI2IDE and the N8. I feel like there isn't enough tinning
> on the board
> to make the surface mount soldering process successful.
> 
> On my SCS2IDE board, I heated up one of the pads to much,
> and the pad 
> came unstuck from the board. Luckily I was able to repair
> it with a short
> piece of kynar.
> 
> I placed the connector where it needed to go, and used my
> small tip
> soldering iron to briefly heat up each finger  hoping
> it would melt the tinning
> and create a connection. When I was done, the connector
> just fell right off.
> 
> Then I added a bit more solder to ech pad on the board,
> then tried it
> again, and this time it stuck, but over on the right, the
> pads are very close 
> together and too much extra solder could easily bridge the
> pins.
> 
> 
> > I'm having trouble deciphering how LM317 (U333) should
> be oriented.
> > She has one in there now, but we already know it needs
> to be redone as
> > she didn't have it oriented to how we agreed at lunch
> (she goofed on
> > her own at the last second).  
> 
> > She's off to the store to get solder
> > wick.
> 
> Solder wick is cheap and it works, sort of. I recommend the
> long blue
> "Solerpult". They come in two lengths, and I recommend the
> longer
> one. The were invented by a friend of my father's at TRW 40
> years
> ago, and they are great. More often then not, they clear
> the hole of
> all solder, unlike the solder wick, which is good for
> getting rid of 
> excess solder.
> 
> > I'm having a longer second look at the schematic vs.
> the
> > board.
> > 
> > The way I see the data sheet
> > (http://www.jameco.com/Jameco/Products/ProdDS/23552.pdf),
> LM317 in a
> > TO92 package with the full round side down looks like
> > 
> > _________________
> > /             
>                
>     \
> > |             
>                
>      |
> > |  ADJ     Vout   
>   Vin    |
> > \             
>                
>    /
> >   \_______________/
> > 
> > On the silkscreen, with the board oriented with the
> power connector
> > bottom left, I see
> > 
> > 1    [2]
> > 3
> > 
> > (hole 2 is bordered with a square)
> > 
> > Judging by the schematics and board images, It looks
> like Vout goes to
> > hole 3, Vin goes to hole 2, leaving Adj to hole
> 1.  This would orient
> > the flat side towards the upper right of the board if
> you put it in
> > without much warping in the legs.  Could someone
> please confirm this?
> > 


Hi!  Yes, the LM317 is reversed and should be installed backwards compared to the PCB silkscreen.  It will be corrected in the next revision of the PCB.  Sorry!

I am traveling at the moment and will give more explanation when I get home.

Thanks and have a nice day!

Andrew Lynch


> > I dug quite a bit to see what sort of silkscreen I
> should expect to
> > see for a basic component package type and actual
> component marking.
> > I found some stuff for diodes and resistor networks
> but little else.
> > I couldn't find anything at all about TO92 or TO92
> invert for
> > transistors or voltage regulators.  Is there a
> reference site someone
> > might link to show cheat sheets on that sort of
> stuff?
> 
> ATTN ANDREW:
> 
> I have attached a photo of how mine is oriented, and
> perhaps Andrew
> can verify whether I have U33 oriented correctly or not.
> 
> 
> 
> 
> As soon as I get my EPROM (flash) programming scenario
> straightened out again, I will be back to firmware
> development,
> and I will post my results, so others can use them also.
> 
> Regards,
> 
> Douglas
> 
> 
> > 
> > Thanks,
> > Mark
> > 
> > On Sat, Jul 16, 2011 at 3:15 PM, Douglas Goodall
> > <douglas...@mac.com>
> wrote:
> >> 
> >> 
> >> 
> >> 
> >> 
> >> 
> >> Http://Goodall.com
> >> 
> >> 
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