I would recommend a functional. After all you have just taken something
out of a working assembly. I would discuss this with the customer
though. With that many boards the cost is something they might want to
consider. Maybe test just a few to validate the design change. As for
the exposed copper I guess some may want it covered but I know of no
requirement unless it comes from the customer. The only argument I can
see as far as IPC/J-STD would be that the leads were cut after soldering
and would normally require reflow or inspection at 10X. I would argue
against the reflow as the lead is going to try to come out of the hole
and could cause a problem. The 10X insp. would also be superfluous in my
opinion.
Charles Caswell
-----Original Message-----
From: TechNet E-Mail Forum. [mailto:[log in to unmask]]
Sent: Monday, August 20, 2001 10:47 AM
To: [log in to unmask]
Subject: Re: [TN] T/H Capacitor Removal- IPC standards?
Thanks Phil and George. Good Points so far.
Our customer does not specify bout the bare copper. However, I am
greatly
concerned about IPC requirements/standards in terms of removing these
caps.
In addition, these are finished assemblies so is it recommended to put
these
units back through a functional test after removal of these capacitors?
Thanks,
John
John Fahey
Manufacturing Engineer
Echelon Corp
415 Oakmead Parkway
Sunnyvale
CA 94085
[log in to unmask]
Phone: 408 938 5330
Fax: 408 328 3804
-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
Sent: Monday, August 20, 2001 10:36 AM
To: [log in to unmask]
Subject: Re: [TN] T/H Capacitor Removal- IPC standards?
John and Charles,
But aren't there some people who expect to have all trimmed leads
soldered after trimming so no bare copper shows through? We have a
customer who requests this attribute.
Phil
-----Original Message-----
From: Charles Caswell [mailto:[log in to unmask]]
Sent: Monday, August 20, 2001 1:28 PM
To: [log in to unmask]
Subject: Re: [TN] T/H Capacitor Removal- IPC standards?
That would be my prefered methos. Least risk of damage to the board,
lowest cost. I wouldnt even clip the solder side.
Charles Caswell
Process Lead, PCB
Frontier Electronic Systems
-----Original Message-----
From: John Fahey [mailto:[log in to unmask]]
Sent: Monday, August 20, 2001 12:17 PM
To: [log in to unmask]
Subject: [TN] T/H Capacitor Removal- IPC standards?
Good Morning.
As part of a design mod, I have been requested to remove 2 Through Hole
resistors from one of our assemblies. There are @2000 boards.
What is the recommended process for removing Through Hole capacitors. Is
there any IPC guidelines?
I would like to just clip the leads on the top and bottom of the board
for
an easy rework. This will leave part of the leads soldered in the
holes,
but I am not aware of any issue with this apart from the fact it may not
look pretty!
Any advice would be much appreciated.
Thanks again,
John
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