Mark;

  I had a similar problem in the past when I was reflowing one connector
used to plug phone line ( Ethernet card ). The problem was related with
shadow effect caused inside our IR oven, the temperature at connector were
about 196 Celsius degree giving us no satisfactory results, we had to change
the line that we were running for other with convection reflow oven.
  Shadow effect is associated with the high of the component and is found at
IR oven, to easy understand the situation you can make association with the
sun light at a building, the side that exposed to sun light is hotter than
the side is located at the shadow. The better you could do is measure the
temperature at terminals and check if they are inside the normal range ( 210
=/- 5 oC ). Convection oven are better for this kind of situation because
the temperature is more consistent across the board due the hot air movement
on the surface of board.
  I hope this help.

Jorge Dourado de Santana
Maintenance / Process Engr
Microtec - Brazil



> -----Original Message-----
> From: Mark Holmes [SMTP:[log in to unmask]]
> Sent: 10 de Abril de 2000 06:22
> To:   [log in to unmask]
> Subject:      [TN] Surface Mount Connector Misery
>
> Hi all,
>
> We are experiencing problems with a 6-way surface mount connector. The
> part
> in question is a Harwin part M22-634XX22R.
> And to a lesser degree the mating part M22-C107133C. The problem is that
> the
> joints do not appear wetted at all, the
> component legs seem to be sitting on top of the solder and the slightest
> force will cause the connector to fall off. The
> problem is currently being investigated by our manufacturing department,
> but
> I am keen to glean as much info as I can
> as to the possible cause. As is the first time with have used a surface
> mount connector, any advice would be most appreciated.
>
> Best regards,
>
> Mark.
>
> Mark Holmes PCB Designer
> Helvar Merca Ltd.
> Hawley Mill, Hawley Road,
> Dartford Kent. DA2 7SY
> Tel: 01322 22 22 11
> Fax: 01322 282 286
> mailto:[log in to unmask]
> http://www.helvar.com
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in
> the body:
> To subscribe:   SUBSCRIBE TECHNET <your full name>
> To unsubscribe:   SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional
> information.
> If you need assistance - contact Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> ##############################################################

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################