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Front panel knob removal on 2225 (or 2xxx series)?
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I managed to remove the"cal" knobs (grub screws) and the "v/cm and
sec/cm" knobs (easy pull off) for cleaning and repair but I cannot budge the remainder. So, can anyone suggest the best way to remove the likes of the position, focus and intensity knobs which don't have grub screws and don't seem to want to pull off :-( Some of these are damaged and I need to replace them but I need to get the old ones off first without wrecking the switch or the shaft. TIA David |
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I can imagine the mess if you get it wrong!!!
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Given the knobs have a pair of "pegs" that engage with PCB mounted pots (assumed from photos I have found of the knobs and assemblies), heating the knobs on the outside of the front panel may not help -- the warmth needs to be applied to where the knob engages with the pot itself between the PCB and the front panel - not much room there. See the pictures of the FP and knobs<> TIA David On 23/02/2019 16:45, tekscopegroup@...<mailto:tekscopegroup@...> wrote:
Gently applying some heat to warm up the stuck knobs usually seems to work wonders. Use a heat gun, but be careful not to overheat them. So far I never had to do this procedure myself, but there are messages out here in this group and elsewhere that recommend this procedure. . |
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Chuck Harris
It isn't that you need to make the knob expand, it is
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simply a matter of warming the plastic a little so it isn't quite so brittle. You must, I repeat must, pull the knob straight off of the shaft. I recently started using a pair of fine pointed needle nosed pliers. I pull the knob up to clear the panel, then stick the points to the knob's skirt's outer edges and pry up gently. They come off very easily. -Chuck Harris David Slipper wrote:
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Roy Morgan
Inspired by watch repair methods:
A couple pieces of hacksaw blade, de-toothed and shaped on a grinding wheel, then bent into short armed L shape, could make a fine pair of levers to get the knobs free. Apply pressure equally on both sides, with the tips well in toward the shaft/center of the knob. Fabric or even paper towel layered under the pivot point prevents panel damage. Roy On Feb 23, 2019, at 6:21 PM, Chuck Harris <cfharris@...> wrote:Roy Morgan K1LKY since 1958 k1lky68@... |
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From my experience with hacksaw blades, I think that any attempt at bending
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them will result in breakage. Then again, if the metal was annealed before bending..., but wouldn't that defeat the object? How about a couple of similar-sized hex-keys used in the same way? Colin. -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Roy Morgan Sent: 17 March 2019 17:23 To: [email protected] Subject: Re: [TekScopes] Front panel knob removal on 2225 (or 2xxx series)? Inspired by watch repair methods: A couple pieces of hacksaw blade, de-toothed and shaped on a grinding wheel, then bent into short armed L shape, could make a fine pair of levers to get the knobs free. Apply pressure equally on both sides, with the tips well in toward the shaft/center of the knob. Fabric or even paper towel layered under the pivot point prevents panel damage. Roy On Feb 23, 2019, at 6:21 PM, Chuck Harris <cfharris@...> wrote:Roy Morgan K1LKY since 1958 k1lky68@... |
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Chuck Harris
Cheap hacksaw blades are hardened steel, through-and-through...
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and break easily. More expensive hacksaw blades are bi-metal, and as such have hardened teeth, and a less hard, more flexible back. Bimetal blades bend without breaking, which is the point behind their use. Either type can be bent without breaking if you apply a torch. Regardless, a pair of needle nosed pliers does a dandy job of removing snap on tektronix knobs. Use them as a prying tool, not a gripping tool. Position them so that their points are straddle the pot's shaft, and are under the skirt of the knob. Lever up carefully, and the knob will pop right off. -Chuck Harris Colin Herbert via Groups.Io wrote: From my experience with hacksaw blades, I think that any attempt at bendingthem will result in breakage. Then again, if the metal was annealed before |
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