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Plan to deep cleaning my gear
Hi,
I am thinking of deep cleaning of my gear. 8566 SA, 8510 VNA, 8515A S-parameter test set, 8350/83592 sweeper. I think I am going to remove all PCBs, soak them into clean water, brush them and dry them with hair dryer as soon as I can. For delicate microwave assemblies like DC, YIG, YTFM, mixer and ovenized crystal, and CRT display, I will just brush dirt off the surface and leave them alone. For sticky keys, soak the keyboard assembly into IPA, rinse them and dry them as quickly as I could. Sounds like a plan? Thank you! Calvin |
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开云体育HiI would not soak the PCBs. Just blow away dirt using air. Somewhere I once read that the laminate of the PCBs can sponge up the water and I don't know whether this is nice. Better not to try it, your instruments are too nice to destroy them by cleaning
:-) if it was a PCB from something really ordinary, I would give it a try, but for sure not with those gems! ;-)
Tobias
-------- Original message --------
From: "Calvin Guan guancalvin@... [hp_agilent_equipment]"
Date: 10/16/17 06:27 (GMT+01:00)
To: hp_agilent_equipment@...
Subject: [hp_agilent_equipment] Plan to deep cleaning my gear
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Hi, |
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As a fan of cleaning old electronics I would make a few comments:
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Look at a number of past threads on cleaning, Not everything really needs total cleaning, some things should not be "cleaned" and some labels can be removed with water. Other things need to be cleaned but can't be cleaned with water/soap (such as HP clear vinyl tubing in power supplies) Start off with some things that are worth less. To really get stuff off, you will need a surfactant but surfactants can remove labels and other marks so you have to be careful what and where. I would not soak pcbs, that can get a lot of water into stuff like pots, and transformers, carefully brush and hose off with water. Avoiding spraying/soaking into stuff like pots and transformers. I would not "dry" with a hairdryer too hot too quick, blow off as much water (taking as much dissolved salts) as you can with lots of cold air, I use a clean leaf blower on at night when there is lots of water in the air(no static). Then possibly rewash, reblow, rewash and reblow (triple rinse) Then dry in a 120F ish temp with some air movement for 24 or more hours. I have used an old fruit dehydrator, worked great, that died from too much use, Now I have been using an oven with a 50W bulb and small crack in door where cord goes in (gets just to 115F) Take lots of pictures before things are taken apart, saved me many a time Just some thoughts John -----Original Message-----
From: hp_agilent_equipment@... [mailto:hp_agilent_equipment@...] Sent: Sunday, October 15, 2017 9:27 PM To: hp_agilent_equipment@... Subject: [hp_agilent_equipment] Plan to deep cleaning my gear Hi, I am thinking of deep cleaning of my gear. 8566 SA, 8510 VNA, 8515A S-parameter test set, 8350/83592 sweeper. I think I am going to remove all PCBs, soak them into clean water, brush them and dry them with hair dryer as soon as I can. For delicate microwave assemblies like DC, YIG, YTFM, mixer and ovenized crystal, and CRT display, I will just brush dirt off the surface and leave them alone. For sticky keys, soak the keyboard assembly into IPA, rinse them and dry them as quickly as I could. Sounds like a plan? Thank you! Calvin ------------------------------------ Posted by: Calvin Guan <guancalvin@...> ------------------------------------ ------------------------------------ Yahoo Groups Links |
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Just be careful about possible water ingress at the edges of the fiber glass boards. It can actually cause some problems with high impedance circuits (Been there...) I would use an ordinary oven and set it to ... 50-60 Degrees Celsius and put the boards in there for about an hour. BR Ulf Kylenfall - SM6GXV |
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开云体育Hi Calvin My recommendation is you just dust equipment out clean edge connectors and service fan assemblies / motors / bearings In short if it is not broken do not fix it I only use soap and water on cases ? I would never do a deep clean as you describe with any of my 50 plus hp items For sticking keyboards I disassemble them to clean them Regards Paul B From:
hp_agilent_equipment@...
[mailto:hp_agilent_equipment@...]
Hi, Posted by: Calvin Guan
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Adrian Nicol
I understand the desire to try and get the insides to look like new! Like Paul, I guess I have 50+ bits of oldish HP and Tek equipment, but I'm not sure I would do what you intend, especially with water! I recall that in the 60's through to the early 80's water washable fluxes were not necessarily used and PCBs were often expected to be cleaned with CFCs (ICI Arklone and the like) to get the rosin based fluxes off, so some components were not sealed and not meant to get wet! Early PCBs often meant for hand assembly did not have a solder resist either so there may be a small risk of moisture penetration of the FR4? I clean things that need it, suspect areas of PCBs due to contamination, old flux from re-work, switches and so on with IPA, dust I blow off with the shop airline, case parts, yes soap, water and brush (and solvent where safe and needed for sticker residue) but the 'aint broke don't fix' mantra is my guide! On Monday, October 16, 2017 5:26 AM, "Calvin Guan guancalvin@... [hp_agilent_equipment]" wrote:
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Hi,
I am thinking of deep cleaning of my gear. 8566 SA, 8510 VNA, 8515A S-parameter test set, 8350/83592 sweeper. I think I am going to remove all PCBs, soak them into clean water, brush them and dry them with hair dryer as soon as I can. For delicate microwave assemblies like DC, YIG, YTFM, mixer and ovenized crystal, and CRT display, I will just brush dirt off the surface and leave them alone. For sticky keys, soak the keyboard assembly into IPA, rinse them and dry them as quickly as I could. Sounds like a plan? Thank you! Calvin |
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I agree with this. I have been involved in many product developments over 40 years ( not for HP) and would not use anything but >99% IPA or DI water, and only if the parts are rated to be cleaned with these solutions. If you don't know if they are rated, they may be damaged. Some trimpots, connectors, etc may not be cleanable without damage. The industry did use Acetone and Freons, but due to safety reasons, those are much less common now. Mark On Oct 16, 2017 5:48 AM, "Adrian Nicol fenland787a@... [hp_agilent_equipment]" <hp_agilent_equipment@...> wrote:
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I had to remove BI/Beckman trimpots from our products at somewhere around 2000 because they would fail after the boards were cleaned. We switched to Bourns, and the problem went away. BI denied that they had a problem, but later they acknowledged that their O-rings were defective as they tried to lure us back.
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We used an industrial circuit board cleaner, with a citrus based solvent that was diluted with water. This was followed by an overnight bake in a 105°F dryer. -----Original Message-----
From: "Mark Goldberg marklgoldberg@... [hp_agilent_equipment]" <hp_agilent_equipment@...> Michael A. Terrell |
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I keep hearing folks here mentioning water penetration
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of circuit board substrates, I think I can help you lay that myth firmly to rest. The process of making pcb's has always involved many long steps where the board is entirely immersed in water or water based solutions. Between each of these steps, the board is immersed in pure clean water as the etchants, and plating solutions are rinsed off of the board. One poster mentioned a board losing its high insulation value due to water washing. I think the resistance was damaged not from the water, but rather from what was in the water, and not from what soaked into the board, but rather from what was left behind on the surface of the board. Detergents come in two basic types, ionic and non ionic. Ionic based surfactants are great cleaners, but are also highly conductive of electricity. If not rinsed fully, they leave a conductive film. This film is often used to dissipate static charge from plastic surfaces, like meter windows. Also, not all water is equal. Hard waters, and acid neutralized waters, have high mineral content, which is in the form of salts. If the water is allowed to evaporate on the board, it will leave a conductive residue of a particularly nasty type: one that changes its resistance with ambient humidity. -Chuck Harris Adrian Nicol fenland787a@... [hp_agilent_equipment] wrote: I understand the desire to try and get the insides to look like new! Like Paul, I guess I have 50+ bits of oldish HP and Tek equipment, but I'm not sure I would do what you intend, especially with water! |
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Thank a lot for all your inputs guys! My instruments work very well for their age. I just wanted to make them great again:)
After reading your posts, I figured I will stay away from using any liquid or solvent for PCB cleaning. I would just? use electronics grade gas duster to blow dust off the surface of the boards. Or a small vacuum and a high quality horse hair brush would work better?? ? ?I was under impression that excessive dust would pick up moisture that would damage my equipments. Is that true? For some very old and dry sticker residue on the front panel, how should I safely remove them? I have Goo Gone but don't know if it's safe for instrument. It's kind of oily. Thanks again! Calvin? |
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The only thing I'd wash with water and soap is the front panel itself (completely removed from the instrument, and any pcbs or wiring harnesses removed from it), any knobs once removed from the pots, and possibly the rubberized keyboard membrane (if applicable) after removed from the backing pcb. They come out like brand new using hot-ish water, manual dishwashing soap (palmolive, dawn, etc), and if necessary an old toothbrush or larger scrub brush (with very soft bristles). For anything else, I'd just use compressed air to remove as much dust as possible and stop there. On Mon, Oct 16, 2017 at 10:39 AM, guancalvin@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
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开云体育I find that Ronson lighter fluid, which is just naptha works very well.? This includes not only label goo, but a wide range of "dirt".? It's mild and doesn't hurt plastics (at least not any that I've come across).? I keep it right there on my bench and use it for most cleaning jobs, including also flux removal.Daun Daun E. Yeagley, II, N8ASB
On 10/16/2017 1:39 PM,
guancalvin@... [hp_agilent_equipment] wrote:
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开云体育?????? You have not said what equipment you want to clean. It does make a difference. I have detailed the method of washing employed at the -hp- service center a great many years ago but this was used on what are now antiques. I will repeat it for any interested. We used liquid dishwashing detergent diluted in warm water in a paint spray gun.?????? For the residue of cal tags and property tags WD-40 works pretty well as does hand cleaner. Naphtha may work and usually does not attack paint. Ronsonol is pretty pure and does not leave a residue, I use it for cleaning camera shutters but canned naphtha is cheaper and probably works as well. I would be careful of the "all purpose" solvents now sold to replace naphtha, MEK, acetone, etc. It really can't and may attack some items naphtha does not. ?????? If you clean a chassis by spraying and rinsing it really must be baked out. We used a ventilated electric oven at 130F for at least two days and I preferred to let things cook for longer if possible.??? Make sure to remove any parts that are water or heat sensitive. On 10/16/2017 12:37 PM, Daun Yeagley
daun@... [hp_agilent_equipment] wrote:
I find that Ronson lighter fluid, which is just naptha works very well.??? This includes not only label goo, but a wide range of "dirt".??? It's mild and doesn't hurt plastics (at least not any that I've come across).??? I keep it right there on my bench and use it for most cleaning jobs, including also flux removal. -- Richard Knoppow dickburk@... WB6KBL |
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>>? ?You have not said what equipment you want to
clean. >> It does make a difference.? I want to clean 8350B/83592B sweep source, 8510 Vector Network Analyzer display and I/F sections, and the S-Parameter test set, and a 8566B spectrum analyzer(RF and Display). The 8510C panel is plastic, others are not, want to make sure whatever I use is going to eat the paint. Thanks, Calvin |
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开云体育?????? Liquid dishwahing detergent like Dawn is safe for nearly everything. You have to test paint. Use a cotton swab somewhere where a mark won't show. Naphtha is safe for many paints but not all, isopropyl alcohol is fairly safe. Solvents like acetone, xylene, etc are almost always going to attack paint. MEK will attack about everything. Watch out for household spray cleaners, some seem benign but are not. Again test in a small place.?????? Kerosene is a fairly mild solvent and may work on residue from labels. Its a good degreaser. On 10/16/2017 2:03 PM,
guancalvin@... [hp_agilent_equipment] wrote:
-- Richard Knoppow dickburk@... WB6KBL |
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I use the citrus based Goo Gone to remove most labels. The citrus oil is very thin, and it evaporates. I have even used ot to remove price tags from paperback books. A few drops on a cotton ball, and let it sit for a few minutes to soften the adhesive, then carefully peel off the label. The older the label, the longer it needs to soak. As far as books or other printed mater, don't rub the surface, or you can remove the ink. I have used over a half gallon of it, so far. I also use it to remove inventory labels from surplus reels of SMD components, to expose the EM labels.
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-----Original Message-----
From: "guancalvin@... [hp_agilent_equipment]" <hp_agilent_equipment@...> Michael A. Terrell |
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开云体育Be careful of using IPA to clean instruments. I had experienced pretty much no problems using IPA until I accidentally hit the leftmost frequency display wheel on my HP 8601A. The IPA dissolved the white lettering on the wheel.DaveD On 10/16/2017 3:24 PM, `Richard Knoppow
dickburk@... [hp_agilent_equipment] wrote:
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Long years ago, people at HP France used Cen Mil E dilued in water at 50% to clean the various tube equipmants where heat and consequently dust were very important . They were dried in a climatic chamber.
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-------------------------------------------- On Mon, 10/16/17, Daun Yeagley daun@... [hp_agilent_equipment] <hp_agilent_equipment@...> wrote:
Subject: Re: [hp_agilent_equipment] Plan to deep cleaning my gear To: hp_agilent_equipment@... Date: Monday, October 16, 2017, 9:37 PM ? I find that Ronson lighter fluid, which is just naptha works very well.? This includes not only label goo, but a wide range of "dirt".? It's mild and doesn't hurt plastics (at least not any that I've come across).? I keep it right there on my bench and use it for most cleaning jobs, including also flux removal. Daun Daun E. Yeagley, II, N8ASB On 10/16/2017 1:39 PM, guancalvin@... [hp_agilent_equipment] wrote: ? Thank a lot for all your inputs guys! My instruments work very well for their age. I just wanted to make them great again:) After reading your posts, I figured I will stay away from using any liquid or solvent for PCB cleaning. I would just? use electronics grade gas duster to blow dust off the surface of the boards. Or a small vacuum and a high quality horse hair brush would work better?? ? ?I was under impression that excessive dust would pick up moisture that would damage my equipments. Is that true? For some very old and dry sticker residue on the front panel, how should I safely remove them? I have Goo Gone but don't know if it's safe for instrument. It's kind of oily. Thanks again! Calvin? #yiv7121087388 #yiv7121087388 -- #yiv7121087388ygrp-mkp { border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;} #yiv7121087388 #yiv7121087388ygrp-mkp hr { border:1px solid #d8d8d8;} #yiv7121087388 #yiv7121087388ygrp-mkp #yiv7121087388hd { color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;} #yiv7121087388 #yiv7121087388ygrp-mkp #yiv7121087388ads { margin-bottom:10px;} #yiv7121087388 #yiv7121087388ygrp-mkp .yiv7121087388ad { padding:0 0;} #yiv7121087388 #yiv7121087388ygrp-mkp .yiv7121087388ad p { margin:0;} #yiv7121087388 #yiv7121087388ygrp-mkp .yiv7121087388ad a { color:#0000ff;text-decoration:none;} #yiv7121087388 #yiv7121087388ygrp-sponsor #yiv7121087388ygrp-lc { font-family:Arial;} #yiv7121087388 #yiv7121087388ygrp-sponsor #yiv7121087388ygrp-lc #yiv7121087388hd { margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;} #yiv7121087388 #yiv7121087388ygrp-sponsor #yiv7121087388ygrp-lc .yiv7121087388ad { 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