Hi Jon,
Yes these are individual caps, each layer is a different value. The board
was screen printed and the bottom layer was machine placed. The next layer
was done by hand dispensing solder paste on each cap termination, and then
hand placing the second layer caps. The board was then reflowed. After
reflow, paste was again hand dispensed on the second layer caps
terminations, the third layer caps were hand placed, and then solder paste
was hand dispensed on the third layer caps termination. Finally the fourth
layer caps were hand placed, and the board sent back through reflow the
second time.
We needed to do it in two reflow steps otherwise the stacks would have
toppled over into each other...
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roberts, Jon (SA-1)
Sent: Tuesday, March 02, 2010 3:04 PM
To: [log in to unmask]
Subject: Re: [TN] Unusual Assembly Requirement...
Steve, these were all individual caps? We have used double stack caps that
were manufactured that way. It just looks fragile. Jon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Tuesday, March 02, 2010 1:52 PM
To: [log in to unmask]
Subject: [TN] Unusual Assembly Requirement...
Hi All,
I came into work today and saw something that I've not seen before. Keep in
mind that the area shown is about ½" square, and that these are 0402's...
http://stevezeva.homestead.com/files/Quad_Stack.JPG
This was done using two reflows, and the caps were not touched by a
soldering iron.
You may ask why. It's because it's what we were asked to do by our customer.
We have a very talented lady working on the production floor who
accomplished this.
Steve
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
This communication is intended only for use by the addressee(s) named herein
and may contain business confidential and/or legally privileged information.
If you are not the intended recipient of this e-mail, you are hereby
notified that any dissemination, distribution, disclosure or copying of this
e-mail and its contents is strictly prohibited. If you have received this
e-mail in error, kindly notify the sender by replying to this message. In
addition, please permanently delete the message and any attachments without
copying or disclosing the contents. Thank you for your cooperation.
THIS DOCUMENT AND/OR SHIPMENT MAY CONTAIN COMMODITY ITEMS, SOFTWARE OR
TECHNICAL DATA THAT IS CONTROLLED BY U.S. EXPORT LAW, AND MAY NOT BE
EXPORTED OUTSIDE THE UNITED STATES OR TO NON U.S. PERSONS WITHOUT THE
APPROPRIATE EXPORT LICENSE FROM EITHER THE U.S. DEPARTMENT OF STATE OR
DEPARTMENT OF COMMERCE.
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
