I haven't put thermocouples on the leading and trailing edge yet (plan to do so before the next run). The oven is 4 years old and we perform regular oven rider analysis to check oven health
Amol
-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Monday, February 14, 2011 9:20 AM
To: TechNet E-Mail Forum; Amol Kane
Subject: RE: Surface Mount connector discoloration
Have you put thermocouples on the leads on the leading and trailing edge? How old is your oven?
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane
Sent: Monday, February 14, 2011 9:16 AM
To: [log in to unmask]
Subject: [TN] Surface Mount connector discoloration
Dear Technetters,
We have a SMT mounted connector: copper alloy base, Ni underplate and gold flash on the surface. The connector is perpendicular to the direction of travel in reflow (LF board, 240C peak). One side of the connector solders with good heel fillets without any discolored pins, but the pins on the other side get discolored (reddish purple hue) and has more inconsistent solder flow on the heel (some acceptable, some barely acceptable). The connector is rated to 260C reflow capable.
The connector can only go in one way, and it's always the leading edge in reflow that has the hue. It could be a part issue or a reflow issue. I wanted to know if anybody else experienced this with the specific connector material set and what the root cause may be
We have a run coming up and I can/will post pictures. Any suggestions before the run with just the explanation given above will be greatly appreciated. I have contacted the manufacturer and await their reply. Just thought I would also e-mail the experts on the group about this.
Regards,
Amol
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