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Forum Index : Microcontroller and PC projects : cmm22 SD card socket woes

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Womble

Senior Member

Joined: 09/07/2020
Location: United Kingdom
Posts: 267
Posted: 10:13am 15 Aug 2020
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  Herry said  I found the reason for the continual solder when trying to remove the bridge on pin 2 (write protect) [not counting corner mounting pins]. It was from solder paste which I had kept smearing on the wick! The local Jaycar had sold me solder paste instead of flux paste. D'oh. Have now applied heaps of genuine flux from a flux pen onto the wick and have tried to wick up anything left. All pins now look dry and pin 3 (card present is signalling OK) But I can't clear the short on pin 2 whatever I do, leaving the iron there for a minute or so. I must have put solder well under the card holder.

Ouch ... sorry to hear of your woes  

  Womble said  I find that soaking some solder braid in liquid flux (from a flux pen) made it MUCH easier to wick away any "Solder Excesses"

I did specify liquid flux from a flux pen.

At least you have managed to get things functional.  Beware of applying too much heat to the pcb ... unless you like lifting pads and damaged tracks (shudder)

I cleaned my CMM2 pcb with aerosol flux cleaner after constructon to ensure there was no flux residue to cause problems later.  Given tht solder paste is conductive, you may want to ensure that any excess paste is also cleaned off the board.  Never having used solder paste I am not sure how you would do that ... the flux cleaner might work, maybe someone with more soldering experience could advise.

Regards

Womble
 
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