Mail*Link(r) SMTP FWD>ASSY: Solder in Connector Pins Greg, We experienced similar problems with the ol'DIP formed sheet metal sockets from some manufacturers. Sometimes the DIP IC's were inserted into the sockets (to add more mass and keep the sockets from "floating" during flow soldering). Frequently, the DIP's were soldered into the socked as well as the socket into the PB. This was not a happy occasion when you needed to change a DIP IC. (;-) The problem was that the surfaces of the socket contacts was very solderable, coupled with a good flux and soldering operation the solder would wick/capillary right up the hollow core of the socket. Depending on how the socket contacts were formed determined if the solder would wick/capiilary up to the component lead and solder it to the socket contact. We went after the socket manufacturers, a couple made slight changes in how they formed the contact to "pinch off" the hollow contact, some others added a polyimide film to work as a plastic dam to seal off the hollow contact between the socket body and the PB. Others didn't do anything and we dropped them from the "approved" component suppliers. Your description reads like you are having a similar problem, IMO you've got to some how seal off the hollow core of you contacts to eliminate the wicking. Ralph Hersey [log in to unmask] -------------------------------------- Date: 8/1/96 11:51 AM From: [log in to unmask] I am experiencing a small amounts of solder in the pins of a 44-pin D-SUB connector after wave solder. The solder is very difficult to see without magnification. The pin type is formed and rolled. The connector manufacturer thinks that the combination of an the active flux used and flux application method, spray fluxing, is the root cause. However, when the connectors are replaced, a hand soldering process is used, yet the pins still fill with solder. I would greatly appreciate any input. Thank You, Greg Kilinski Acuson Corp. [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** ------------------ RFC822 Header Follows ------------------ Received: by quickmail.llnl.gov with SMTP;1 Aug 1996 11:47:45 -0700 Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI) id NAA14701; Thu, 1 Aug 1996 13:36:06 -0700 Resent-Date: Thu, 1 Aug 1996 13:36:06 -0700 Received: by ipc.org (Smail3.1.28.1 #2) id m0um1UY-0000MqC; Thu, 1 Aug 96 12:24 CDT Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> From: [log in to unmask] Date: Thu, 01 Aug 96 10:30:45 PST Message-Id: <[log in to unmask]> To: [log in to unmask] Subject: ASSY: Solder in Connector Pins Resent-Message-ID: <"EMnUi2.0.SdK.NXE0o"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/5502 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************