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Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Cleaning PCB'S after rework ect.

John Kirby

#14526

Cleaning PCB'S after rework ect. | 27 August, 1998

Could someone please help me. We clean our PCB's with Safewash at present. As most of our work has to be upto MIL-STD, we cannot clean the PCB when transformers are fitted? Could someone please help???? Thank you J Kirby

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Justin Medernach

#14528

Re: Cleaning PCB'S after rework ect. | 28 August, 1998

| Could someone please help me. We clean our PCB's with Safewash at present. As most of our work has to be upto MIL-STD, we cannot clean the PCB when transformers are fitted? Could someone please help???? | Thank you | J Kirby J, You have a couple of options. You can use a flux remover an foam tipped applicators for removal. Actually, what type of flux are you using? I need that one first. Is it RMA or Water soluble? Talk to ya, Justin

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MIKE

#14530

Re: Cleaning PCB'S after rework ect. | 1 September, 1998

| | Could someone please help me. We clean our PCB's with Safewash at present. As most of our work has to be upto MIL-STD, we cannot clean the PCB when transformers are fitted? Could someone please help???? | | Thank you | | J Kirby | J, | You have a couple of options. You can use a flux remover an foam tipped applicators for removal. Actually, what type of flux are you using? I need that one first. Is it RMA or Water soluble? | Talk to ya, | Justin TRY MICRO-CARE'S MCC-2004 IN A SPRAY CAN. IT IS GREAT AT REMOVING RMA FLUX. CALL ME FOR A FREE SAMPLE 800-426-3265

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John Kirby

#14529

Re: Cleaning PCB'S after rework ect. | 3 September, 1998

| | Could someone please help me. We clean our PCB's with Safewash at present. As most of our work has to be upto MIL-STD, we cannot clean the PCB when transformers are fitted? Could someone please help???? | | Thank you | | J Kirby | J, | You have a couple of options. You can use a flux remover an foam tipped applicators for removal. Actually, what type of flux are you using? I need that one first. Is it RMA or Water soluble? | Talk to ya, | Justin Hi Justin We use a water soluble fux. I am tring some 141B Solvent at the moment, If you can think of anything, let me no. J Kirby

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Graham Naisbitt

#14527

Re: Cleaning PCB'S after rework ect. | 5 September, 1998

John, I believe that your problem is cuased by inadequate filling of the transformers with potting material - if any is used at all. When you attempt to clean, particularly with a chemistry, it is designed with wetting agent, surface tension modifiers, to facilitate penetration under and INTO components! Because your rinse water does not have these same characteristics, it becomes extremely difficult to encourage the stuff to come out. Solution: get the guy who makes your transformers to seal the bloody things so that this problem will go away. Good luck. Graham Naisbitt Concoat Ltd Tel +44 1276 691100 Graham.Naisbitt@concoat.co.uk | Could someone please help me. We clean our PCB's with Safewash at present. As most of our work has to be upto MIL-STD, we cannot clean the PCB when transformers are fitted? Could someone please help???? | Thank you | J Kirby

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