In my experience, the copper, without HASL is worse than the HASL, for those
old printers and placers.
We resorted to machine eraser.
http://www.dickblick.com/products/sakura-cordless-electric-eraser/
We cleaned the board fiducials at receiving inspection.
Gold will be more repeatable but I would think a switch from HASL to ENIG
would be a major change. If it is a real simple design and HASL has good
yields, I would expect ENIG to introduce more problems than it solves. It
did in my case. We probably could have resolved the soldering problems by
tweaking the reflow and wave settings. But, we went back to HASL. The buyer
and the plant manager made the call.
Immersion tin and immersion silver change color too. I bet your machines
would have trouble with it. My experience with this problem dates back to
the age of your old printers. Immersion Tin and Silver have been greatly
improved since then.
Wish I could be more help.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jim West
Sent: Friday, September 05, 2014 9:47 AM
To: [log in to unmask]
Subject: Re: [TN] NOT Recognizing Panel Fiducials at paste printer.
Thanks for the replies. We build many thousands of this board so I was
looking for a more permanent suggestion to give our board supplier. My
thought was having the board supplier NOT apply solder (HASL) to the
fiducials. Is this possible? Any other suggestion for a more permanent
solution that our board house could implement without major changes (i.e.
Immersion tin, or gold....). Major change would require an older board
going through customer approval.
Best Regards,
Jim
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan TEMPEA
Sent: Friday, September 05, 2014 7:52 AM
To: [log in to unmask]
Subject: Re: [TN] NOT Recognizing Panel Fiducials at paste printer.
Jim,
Removing the solder from the fiducials, using a solder wick, normally takes
care of the issue.
Regards,
Ioan Tempea, P. Eng.
Manufacturing Engineer
Satellite Systems
MDA
21025 TransCanada Highway
Ste-Anne-de-Bellevue, Qc, Canada H9X 3R2
Tel: +1-514-457-2150-3556
www.mdacorporation.com
This e-mail, and any attachments, are intended solely for the use of the
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-----Message d'origine-----
De : TechNet [mailto:[log in to unmask]] De la part de Stephen Gregory Envoyé :
Thursday, September 04, 2014 4:29 PM À : [log in to unmask] Objet : Re: [TN]
NOT Recognizing Panel Fiducials at paste printer.
Hi Jim,
An old trick that I've used many times when the camera doesn't recognize a
fiducial is to take a pencil eraser to it...
Steve
Sent from my BlackBerry 10 smartphone.
Original Message
From: Jim West
Sent: Thursday, September 4, 2014 2:05 PM
To: [log in to unmask]
Reply To: TechNet E-Mail Forum
Subject: [TN] NOT Recognizing Panel Fiducials at paste printer.
Our paste printers are having difficulty recognizing the fiducials on an
older board that has been running for years. The board house is applying
HASL and because of that, as most are aware, the solder covering the
fiducial pad will be inconsistent. I'm told that this has been an ongoing
issue and the problem comes and goes.
We have three printers that are older that do not allow us to adjust the
lighting.
I can't remember if we can have the board house apply HASL on just the
component pads and not the fiducials? Any other suggestions?
Thanks,
Jim
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