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August 2005

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Subject:
Re: <List>[TN] Exposed Copper on PWB- Rejectable
From:
Mumtaz Bora <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Mumtaz Bora <[log in to unmask]>
Date:
Sun, 21 Aug 2005 21:34:30 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (124 lines) 
Hi Bob, Steve and Jeff, Thank-you for your inputs regarding exposed copper.
I have rejected the PWBs per IPC A 600- solder mask adhesion criteria for
IPC Class II.



At 02:07 PM 8/16/2005 -0700, Bob Metcalf wrote:
>Mumtaz,
>
>I agree with Steve. I assume from the pictures that this is the way you
>received the boards from your vendor. This is an unacceptable condition and
>should be returned for rework or remake. The cause is most likely surface
>prep prior to mask application or could be related to under cure of the
>mask.
>
>Regards,
>
>Bob Metcalf
>Circuit Solutions
>949-709-2544
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Hodge
>Sent: Tuesday, August 16, 2005 12:12 PM
>To: [log in to unmask]
>Subject: Re: [TN] <List>[TN] Exposed Copper on PWB- Rejectable
>
>
>Mumtaz, solder mask adhesion caused by poor precleaning prior to masking
>operation. The problem will worsen after a thermal excursion. No way would
>I assemble the boards-get an RMA. Just my humble opinion. Good luck, Steve.
>
>At 01:12 PM 08/16/2005, you wrote:
> >Dear All,
> >
> >
> >I need a second opinion on the rejection of this exposed copper to resolve
> >a line issue for IPC Class 2 . The defect images are posted on Steven
> >Gregory's website. Please go to page 2  and look for exposed Copper 1 and
> >Exposed copper 2.  Thank-you Steven for the posting.Go
> >to:http://www.stevezeva.homestead.com
> >
> >Thank-you
> >
> >Mumtaz
> >
> >  D/ 252 - SMT Process and Component Quality
> >  Bldg. V238E
> >Voice  (858)-882-1967
> >Fax    (858)-882-3126
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> >Cell:   (858) -449-7054
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> >Kyocera-Wireless Corp.
> >10300, Campus Point Drive
> >
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Thank-you

Mumtaz

  D/ 252 - SMT Process and Component Quality
  Bldg. V238E
Voice  (858)-882-1967
Fax    (858)-882-3126
Page  (858)-635-1180
Cell:   (858) -449-7054
email: [log in to unmask]
Kyocera-Wireless Corp.
10300, Campus Point Drive

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
San Diego, Ca  92121,USA

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