If the IPC 610 labels it as a process indicator then it is not truly a defect correct? Therefore it does not need rework, but does require process improvement. By the way, thanks for all of your responses regarding the upside down chip resistors. John Moses >>> [log in to unmask] 02/11/02 11:32AM >>> The entrapment of chemical process chemistries is an issue because material can become entrapped in the kerf. If the component in upside down it cannot be cleaned. The rev C version of the IPC 610 does call this a process indicator so for that reason I guess it has become a non isuue. Dyane White Process/Technical Trainer Philips Ultrasound Mel Parrish <mparrish@SOLDERIN To: [log in to unmask] GTECH.COM> cc: (bcc: Dyane White/ATL-BTL/MS/PHILIPS) Sent by: TechNet Subject: Re: [TN] Upside down chip resistors <[log in to unmask]> Classification: 02/08/02 05:22 PM Please respond to "TechNet E-Mail Forum."; Please respond to Mel Parrish Agree with MoonMan, but for discussion, this criteria was included in the standards some time ago and was a carry over from the Mil Specs. The testing was accomplished then to determine if there was justification to consider orientation of these components. The tests for a particular program proved that there was a very significant increase in component operational life if the component was face up. We didn't look at the "why" although there was speculation concerning entrapment of process chemistries, or thermal issues for the film close to the board. IPC-A-610C calls this a Process Indicator for Class 2 and 3 which wouldn't support rework. If the long term reliability of the component was a concern, you might look at effective methods to correct it (not point to point soldering). Best option is to orient up if it by process if required. Mel Parrish Soldering Technology International Madison, AL 256 705 5530 256 705 5538 Fax [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Earl Moon Sent: Friday, February 08, 2002 12:51 PM To: [log in to unmask] Subject: Re: [TN] Upside down chip resistors The less rework, the better. When replacing or reworking any chip device, using hand soldering techniques, chances are damage will ensue. MoonMan ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or 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 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or 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 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or 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 1.8d 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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------