I agree with you Phil.
We never allow manual (hand) washing of assemblies with water only or semi-aqueous cleaners.
Only time we allow a manual process is for localized cleaning with specified (non-water based) solvent cleaners. Even then only if the assembly is not suitable for an inline cleaning process.
Also IPA is not what we consider a suitable solvent for cleaning flux residues.
Rich Kraszewski
Plexus Senior Staff Process Engineer
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From: TechNet [mailto:[log in to unmask]] On Behalf Of Nutting, Phil
Sent: Saturday, June 20, 2020 9:04 AM
To: [log in to unmask]
Subject: [TN] installing and hand washing as a final step
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Hi All,
I hope you have all been able to avoid becoming ill.
We have found some components (presumed) to be problematic when machine washed. Avago optos, TI PTH logic (yes, we still do thru-hole), film capacitors, trim pots and some other components are usually the offending parts. These components are then designated to be hand installed, soldered and washed after the boards are machine installed, solder and washed.
I fear the '70s are coming back.
About 80% of our PTH boards and 100% of our SMT boards are built by CMs. We do not specify solder, flux or cleaning systems. We do however specify lead-free and a cleanliness standard. In-house PTH boards are washed in a closed loop batch DI washer.
I'm not a fan of switching to hand solder and wash for the simple reasons of hand soldering is less consistent and hand cleaning may just spread residue to a wider area.
I know I'm possibly opening a can of worms for process control, water pressure, wash chemicals, choice of flux/paste. Is this a common manufacturing solution? To me this is like fingernails on a chalkboard.
Phil Nutting | HVP Senior Development Engineer | Excelitas Technologies Corp
Lab: +1 978.224.4332 | Office: +1 978.224.4152
35 Congress St, Salem, MA 01970 USA
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