WE REPAIR OUR BOARDS USING BOTH THE SUGGESTED METHODS. BOTH ARE
ACCEPTABLE.
        SOLDER METHOD
AS LONG AS YOU CLEAN THE EXPOSED COPPER AREA, AND APPLY FLUX AND
USE ONLY ENOUGH HEAT TO FLOW
THE SOLDER, THEN THERE WILL NOT BE A PROBLEM WITH THE HEATING OF
THE COPPER OR BOARD.
        CAN YOU USE A LOWER MELTING POINT SOLDER FOR THIS
APPLICATION ?

        ADDING RESIST
CAN YOU ADD A COLOUR PIGMENT TO MATCH AS CLOSE AS POSIBLE THE
COLOUR OF YOUR RESIST ?
MIX UP SOME SAMPLES, AS IT DOES DRY A SLIGHTLTY DIFFERENT COLOUR.

ASSUMING THAT THE PROBLEM IN THE FIRST PLACE IS ACCEPTABLE, THEN
DOING EITHER OPTION IS ONLY A COSMETIC ISSUE .


Roger Deakin.
email [log in to unmask]
tel +44 (0)1983 202632
fax +44 (0)1983 202106
company BRITISH AEROSPACE DEFENCE LTD LAND AND SEA SYSTEMS



> -----Original Message-----
> From: glenn pelkey [SMTP:[log in to unmask]]
> Sent: Thursday, April 15, 1999 1:29 AM
> To:   [log in to unmask]
> Subject:      [TN] Soldermask off-rework options
>
>                    *** WARNING ***
>
> This mail has originated outside your organization,
> either from an external partner or the Global Internet.
>      Keep this in mind if you answer this message.
>
>
> Hello all,
>
> We are seeing some soldermask coming off the board during
> assembly which exposes the copper.  The size is relatively
> small at
> about 20-mils square, the location about 40-mils from the edge,
> and
> located on a ground plane.  We think we know what's causing it,
> but my
> question deals with rework.
>
> Two options have been presented:
> 1)  Apply new soldermask and cure.  Seems reasonable, but the
> customer
> doesn't like the appearance.
> 2)  Apply solder and clean.  There may be an issue with
> applying
> enough heat to get good wetting and too much heat resulting in
> damage, especially considering it's a ground plane.
>
> Anyone know of a specification issue why either option can't be
> done?
>  Any experiences, good or bad?
>
> Thanks for all your help, today and in the past.
>
> Glenn
> [log in to unmask]
> [log in to unmask]
>
> _______________________________________________________________
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