I guess I will be the one to ask the obvious question.... Have you looked
into a Rigid/Flex design where the 2 boards are integrated into one board?
an example can be found at this link:
http://www.dyconex.co.uk/prod02Flexrigid.htm

Bill Brooks
PCB Design Engineer
DATRON WORLD COMMUNICATIONS INC.
3030 Enterprise Court
Vista, CA 92083
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
mailto:[log in to unmask]
IPC Designers Council, San Diego Chapter
http://www.ipc.org/SanDiego/
http://home.fda.net/bbrooks/pca/pca.htm



-----Original Message-----
From: Joseph Keary [mailto:[log in to unmask]]
Sent: Friday, July 13, 2001 11:56 AM
To: [log in to unmask]
Subject: [TN] FLEX CIRCUIT FAILURE


HELLO TECHNETERS

GOOD FRIDAY TO YOU ALL

I HAVE A PROBLEM THAT I AM HOPING SOMEBODY CAN HELP WITH. I HAVE A FLEX
CIRCUIT BEING HOTBAR SOLDERED TO A PCB. THERE ARE COMPONENTS UNDER THE FLEX
CIRCUIT. THIS CAUSES THE FLEX TO EXIT THE SOLDER JOINT AT ABOUT A 30 DEGREE
ANGLE. WE ARE PRESENTLY HAVING FAILURES IN THE SOLDER JOINTS OF THE FLEX TO
PCB. THE COMPONENTS UNDER THE FLEX STRIP ARE WELL PLACED (FILTER CAPS).
MOVING THESE PARTS COULD CAUSE THE PCB NOT TO PASS EMC TEST. THESE
ASSEMBLIES GO INTO AN  ENVIROMENT THAT HAS A LOT OF VIBRATION INVOLVED.

1) IS THIS 30 DEGREE ANGLE A REAL PROBLEM ?

2)IS THERE POSSIBLY MORE THAT I SHOULD BE LOOKING AT?

3)IS THERE A WAY OF SOLVING THIS PROBLEM WITHOUT MOVING THE COMPONENTS




  ALL COMMENTS GREATLY APPRECIATED



   THANKYOU
   JOE KEARY
  SR. PCB DESIGNER
  SYSTRON AND DONNER

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