We make some COB PCBs and I need a UV solder mask touch up pens ??
Can anybody recommend addresses ?
Thanks
Anil Kher
-----Original Message-----
From: Roger Deakin <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Friday, April 16, 1999 12:42 PM
Subject: Re: [TN] Soldermask off-rework options
>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,
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>> 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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