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#1
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Cleaning Tektronix TM500 series cam switches??
Hi folks.
Wondering if anyone here knows a good way to clean and restore life to the rotary cam finger switches like are used in Tek SC502, SG503 etc. I don't have any of the blue and the red CAIG fluid anymore but to anyone here who ever used it what do you think of the stuff?? I had two little bottles with a built it applicator brush and I thought the stuff worked great! My SG503 went bonkers and I used spray isopropyl alcohol and then a small shot of WD-40 on the contacts. Seems o.k. now. |
#2
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Cleaning Tektronix TM500 series cam switches??
In article ,
Gudmundur wrote: Hi folks. Wondering if anyone here knows a good way to clean and restore life to the rotary cam finger switches like are used in Tek SC502, SG503 etc. Some Tek components come with a warning not to use anything stronger or more persistent than high-grade isopropanol on their switches (e.g. the attenuator switches in the 4xx-series o-scopes). These switches incorporate materials which can be damaged by many organic solvents, or are used in high-impedance circuits in which small amounts of leakage current from contact-cleaner residue can mess up the behavior of the circuit. I don't have any of the blue and the red CAIG fluid anymore but to anyone here who ever used it what do you think of the stuff?? I had two little bottles with a built it applicator brush and I thought the stuff worked great! Agreed. Both the original (German) Cramolin products, and the DeOxIt formulations which Caig is selling these days, seem to work quite well for many of these sorts of problems. My SG503 went bonkers and I used spray isopropyl alcohol and then a small shot of WD-40 on the contacts. Seems o.k. now. Ugh. I would never recommend using WD-40 on electrical contacts in fine electronic equipment. It gets gummy with time, and attracts dust. It may make things better in the short run but I fear that if it's left in place it may cause further (worse) problems. I'd recommend flushing it out with another spray of isopropanol. If the switches do need lubing, check the Tek manuals for the proper procedure, if you can. Some of the modern contact-and-control lubricants are designed both for electrical stability, and to stay where they're put and not migrate around where they aren't wanted. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
#3
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Cleaning Tektronix TM500 series cam switches??
Dave Platt wrote: In article , Gudmundur wrote: Hi folks. Wondering if anyone here knows a good way to clean and restore life to the rotary cam finger switches like are used in Tek SC502, SG503 etc. Some Tek components come with a warning not to use anything stronger or more persistent than high-grade isopropanol on their switches (e.g. the attenuator switches in the 4xx-series o-scopes). These switches incorporate materials which can be damaged by many organic solvents, or are used in high-impedance circuits in which small amounts of leakage current from contact-cleaner residue can mess up the behavior of the circuit. I don't have any of the blue and the red CAIG fluid anymore but to anyone here who ever used it what do you think of the stuff?? I had two little bottles with a built it applicator brush and I thought the stuff worked great! Agreed. Both the original (German) Cramolin products, and the DeOxIt formulations which Caig is selling these days, seem to work quite well for many of these sorts of problems. My SG503 went bonkers and I used spray isopropyl alcohol and then a small shot of WD-40 on the contacts. Seems o.k. now. Ugh. I would never recommend using WD-40 on electrical contacts in fine electronic equipment. It gets gummy with time, and attracts dust. It may make things better in the short run but I fear that if it's left in place it may cause further (worse) problems. Agreed - WD40 is good for de-gumming your chainsaw, preventing rust on garden tools, and freeing up rusted bolts, but thats about it. BP grade isopropyl(sp) alcohol is readily available from chemical suppliers - (A litre bottle will last you for EVER) - if you do insist on a "tougher: lubricant, then CRC 2-26 is pretty good. BUT - as in everything else - RTFM before you do ANYTHING! Andrew VK3BFA. |
#4
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Cleaning Tektronix TM500 series cam switches??
Andrew VK3BFA wrote:
Ugh. I would never recommend using WD-40 on electrical contacts in fine electronic equipment. It gets gummy with time, and attracts dust. It may make things better in the short run but I fear that if it's left in place it may cause further (worse) problems. Agreed - WD40 is good for de-gumming your chainsaw, preventing rust on garden tools, and freeing up rusted bolts, but thats about it. BP grade isopropyl(sp) alcohol is readily available from chemical suppliers - (A litre bottle will last you for EVER) - if you do insist on a "tougher: lubricant, then CRC 2-26 is pretty good. BUT - as in everything else - RTFM before you do ANYTHING! "TFM" for WD-40 is at: http://www.wd40.com/Brands/wd40.cfm The website enthuses about all the uses of WD-40, including that it "dries out" electrical systems. (Recall that the "WD" stands for "water displacement".) But even on their own site, I couldn't find any word about WD-40 as a switch cleaner and contact lubricant... and that speaks loudest of all. -- 73 from Ian GM3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
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