PCB Cleaning
« on: September 12, 2019, 08:00:22 PM »
Wanted to get some knowledge about this.

No matter how many times I spray and clean this PCB with Flux cleaner, and a Qtip with Isopropyl alcohol.  It still looks murky!

What am I doing wrong? Why wont it clean.

Im using Kester 331 63/37 solder.

Thanks in advance!


Re: PCB Cleaning
« Reply #1 on: September 12, 2019, 08:41:21 PM »
Hello

Are you sure the varnish don't melt ?

Best
Zam

Re: PCB Cleaning
« Reply #2 on: September 12, 2019, 09:50:57 PM »
Hello

Are you sure the varnish don't melt ?

Best
Zam

No the varnish didnt melt.  Just murky.  They say this is water soluble solder, but Im afraid to clean it with water on it.  what do you think?

squarewave

Re: PCB Cleaning
« Reply #3 on: September 12, 2019, 10:08:58 PM »
Just googled Kester 331 and it states:

Quote
The residue can be completely removed with a simple heated water rinse. Deionized water is suggested to prevent introduction of chemistries from unknown water sources.

Script

Re: PCB Cleaning
« Reply #4 on: September 13, 2019, 01:29:47 AM »
For that I mix and use:
9/10 isopropyl
1/10 acetone

Khron

Re: PCB Cleaning
« Reply #5 on: September 13, 2019, 05:15:17 AM »
Are you having noise issues because of that? If not, and since most likely the board will be inside a metal(?) enclosure... I personally wouldn't bother ::)
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

sodderboy

Re: PCB Cleaning
« Reply #6 on: September 21, 2019, 10:02:23 AM »
I use miller stevenson or equivalent flux remover and a toothbrush.  If there are open thru holes on the board you have to mop the other side with solvent on a wipe or qtip to do a complete job.
I wear gloves as well.

Ricardus

Re: PCB Cleaning
« Reply #7 on: September 21, 2019, 02:37:37 PM »
First I use acid brushes with 99.5% alcohol. Then I use those foam "paint brushes" with the chiseled tip to follow up. If there's any murkiness left I use the blue paper towels (they're lint free) and use my index finger to clean it with some pressure. Beyond that I don't care. As long as it looks OK and it's not affecting the audio I'm fine.
Audio mastering for hire..

Whoops

Re: PCB Cleaning
« Reply #8 on: September 26, 2019, 09:23:40 PM »
What am I doing wrong? Why wont it clean.

I always use this PCB cleaner solution/spray and never run into the same situation, it always gets the boards cleaned perfectly

https://uk.rs-online.com/web/p/contact-cleaners/8232634/


 

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