From purist's point of view ; you may be right Grant ;
but from practical point ?
I'd definitely throw off all caps, etc (tested way high malfunction
consequences data base).
Clueless is the word ; some choice of life test "simulation"
(quick, say days in cycling chamber, or soak ramp up/downs)
would be desirable to gain at least some degree of clue ;
but I did not find any particular drama with lifting expensive chips .
If you lift and replace with validated (say flowmaster 5K) profile (most
chips can take few passes);
you just need a very good technician with feel for physics .
Next down method of working on heat plate (120-150'C)
with one of the ersa's flood tips (on leaded items that is) .
The heat plate to ease thermal shocks, if yo wouldn't buy jets .
Agree it's good base/ethics/etc., what yo say,
but practically, especially for contract folks this is often too lofty ;
they may get few bare boards extra , but not on rockwell treasures .
All above said,
both considerations for and consequences against should be determined by
better than just feels,
(all too)"common sense", emotions or "better safe than sorry" managerial
"decisions" .
Often i found items with proven life gave me fewer nasty surprises than
brand new wonders .
Be it chips or cars . It takes little to gain adequate clues .
Hey ' once (in my sub days, like Steve 's grinding now) we got this clock
chip (no name) with glorious J leads,
just right to reflow easy ; guess what ; those bugs had batteries inside
(found cooked upon autopsy)!
After we've killed a dozen of this beetles (didn'quite pass test guy) ;
asked the customer: who was blissfully unaware of any desirable spec. sheets
.
No sockets designed , handsoldering J's for weeks (on original quote!).
Became a cynic since than .
Regarding you too Grant,
Paul
-----Original Message-----
From: Grant Emandien [mailto:[log in to unmask]]
Sent: Friday, 31 March 2000 23:25
To: [log in to unmask]
Subject: [TN] Use of reclaimed devices
Hi all,
I noticed in a forum contributor's email the practice of using reclaimed
ICs. Surely this is not accepted practice. I ask this because a supplier of
ours had requested the possibility of doing this as he had a shortage on the
ICs in question and the fact that they were particularly expensive.
Needless to say, we rejected this notion as we are clueless on the
consequences of such practice.
Regards
Grant
##############################################################
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
##############################################################
|
