Urs Koenig (QL) wrote, on 27/Apr/10 18:22 | Apr27:
Hi all
While continue to work on the Sinclair QL Preservation Project (SQPP) I was
having a closer look at my Thor computers some weeks ago. I was surprised to
see that the electronics showed at least two optical problems.
1. The printed circuit board (pcb) and the soldered components show some
kind of "patina".
2. The batteries seam to leak or transpire some kind of "acid".
See those PIC's:
http://tinyurl.com/ql-pics/QLcomputers/CST
What should/can I do?
Clean it (how)?
Remove the battery (cut or solder)?
Any hint or help is highly appreciated!
The battery leak is pretty normal.
It seems you have removed it already from the photos.
If not then melt the solder one side at a time and pull out.
I usually clean off the corrosion (like on the oscillator and some caps)
with a toothbrish and iso-propyl alcohol.
I also have a detergent based cleaner that is used with water. I guess
a little liquid detergent (non-foaming) again with a toothbrush and
cleaning off with a little water (and drying with a kitchen towel, and
then putting in a hot place overnight would be OK.
Maybe though what you are seeing is corrosion due to damp. I have seen
similar things on some of my old QL boards.
Tony
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