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G6Tanuki · 7th Jul 2017, 3:14 pm

A nice simple fix! (even if getting in there to do it was less than easy). Those kind of high-value resistors seem to enjoy drifting high even if they're not being subjected to any current/voltage/heat.

As to using surgical instruments - I've found locking "Artery Forceps" to be hellish useful in these sorts of situations: you can lock them on to a component lead before unsoldering, then give the forceps a quick pull to wangle the lead out of the PCB. Much less risk of damage than trying to coordinate soldering-iron abd ordinary snipe-nose pliers in a confined space.

One of the small traders that visits radio rallies in the South/South-West usually has vast trays of these kind of forceps in different sizes for a quid or so each. Seems that in times-past the used surgical-instruments would be collected up, autoclaved and re-used but in these days of heightened infection-control they have standard radiation-sterilised "packs" of all the instruments you need for a particular operation and once these packs are opened any unneeded contents are no longer sterile so cannot be used in-theatre. Hence they end up being disposed-of, to be used by us radio-types!

7th Jul 2017, 3:14 pm	#5
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,010	Re: Fixing the focus on a Tektronix 2210. A nice simple fix! (even if getting in there to do it was less than easy). Those kind of high-value resistors seem to enjoy drifting high even if they're not being subjected to any current/voltage/heat. As to using surgical instruments - I've found locking "Artery Forceps" to be hellish useful in these sorts of situations: you can lock them on to a component lead before unsoldering, then give the forceps a quick pull to wangle the lead out of the PCB. Much less risk of damage than trying to coordinate soldering-iron abd ordinary snipe-nose pliers in a confined space. One of the small traders that visits radio rallies in the South/South-West usually has vast trays of these kind of forceps in different sizes for a quid or so each. Seems that in times-past the used surgical-instruments would be collected up, autoclaved and re-used but in these days of heightened infection-control they have standard radiation-sterilised "packs" of all the instruments you need for a particular operation and once these packs are opened any unneeded contents are no longer sterile so cannot be used in-theatre. Hence they end up being disposed-of, to be used by us radio-types!