On 15/04/2022 18:49, Rob Jarratt via cctalk wrote:
I am using a fairly cheap desoldering station (this one https://cpc.farnell.com/duratool/d00672/desoldering-station-uk-eu-plug/dp/SD 01384?st=duratool%20desoldering). Its spec in terms of vacuum pressure is equivalent to that of the professional Hakko ones though. I am also trying a hand desoldering pump. None of these are able to clear many of the holes of solder, although some are doing better than others. Nevertheless, the IC remains stubbornly unmoving.
I have that one too and I've found it to be reasonably good (compared to a manual pump - I've never had access to an expensive desoldering station.).
I've not tried it on anything Qbus related, only relatively modern motherboards and the like, but it has been quite good at getting the solder out. Sometimes I need to wiggle the end of the pins to break contact with the via. Removing a 20-pin IC can take a good 15 minutes but when the IC legs don't stick then it can be very quick. I have sometimes resorted to using a hot air gun with the fine nozzle to warm things up first and then use the Duratool.
When I first got the desolder gun I played around with scrap motherboards to get the hang of it.
There are a fair few YT videos about that Duratool (it seems to be a variant of the ZD-915) and there are various modifications that people have made. Those videos often have examples of it in action along with hints and tips that people have found useful. As usual, take with a hefty grain of salt. (The ones that modify the tool to try and increase the vacuum pressure seem particularly sketchy ... YMMV).
Antonio -- Antonio Carlini anto...@acarlini.com
