| rachana.balakumar@gmail.com: Feb 19 08:42AM -0800 > List of Solutions Manuals and Test Banks > ________________________________________ > Hi i need the solution manual for Solution manual Mass and Heat Transfer : Analysis of Mass Contactors and Heat Exchangers (T. W. Fraser Russell, Anne S. Robinson, Norman J. Wagne |
| "(PeteCresswell)" <x@y.Invalid>: Feb 18 03:47PM -0500 Per KenO: >Inherited an electronics unit that has severe contact corrosion due to bad alkaline batteries. >Appreciate any suggestions how to restore these contacts to working condition. White vinegar applied with a Q-Tip worked for me the one time I had a similar situation. -- Pete Cresswell |
| John Robertson <spam@flippers.com>: Feb 18 03:46PM -0800 On 2018/02/17 12:06 PM, Reinhard Zwirner wrote: > As has been suggested in a previous thread: (concentrated) white vinegar. > HTH > Reinhard Actually the EverReady battery engineer I spoke to back in the late 80s recommended white vinegar:water with a 50:50 ratio, not pure or concentrated white vinegar. A weak acid to neutralize a weak base. And as Peter W. so correctly pointed out, the common zinc/carbon battery leaks a mild acid and so you use baking soda (a mild base). So be sure to identify the type of battery before attempting corrective measures. John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| Reinhard Zwirner <reinhard.zwirner@t-online.de>: Feb 19 03:23PM +0100 John Robertson schrieb: > On 2018/02/17 12:06 PM, Reinhard Zwirner wrote: [...] > Actually the EverReady battery engineer I spoke to back in the late > 80s recommended white vinegar:water with a 50:50 ratio, not pure or > concentrated white vinegar. My experience: concentrated white vinegar achieves best results. But YMMV ... [...] > So be sure to identify the type of battery before attempting > corrective measures. FACK! Best regards Reinhard |
| KenO <kenitholson@yahoo.com>: Feb 19 07:37AM -0800 Thanks everyone for your suggestions!!! Will try to combine any questions. "...identify the type of battery before attempting corrective measures" Unfortunately the person I received the electronic device from removed the batteries and does not remember if the batteries were zinc/carbon or alkaline. Question: Can baking soda if used on the residue left by alkaline batteries cause additional damage? |
| Terry Schwartz <tschw10117@aol.com>: Feb 19 07:44AM -0800 Your initial post said alkaline batteries. On Monday, February 19, 2018 at 9:37:37 AM UTC-6, KenO wrote: |
| peter wieck <peterwieck9@gmail.com>: Feb 19 07:48AM -0800 On Monday, February 19, 2018 at 9:37:37 AM UTC-6, KenO wrote: > Question: Can baking soda if used on the residue left by alkaline batteries cause additional damage? For the most part, none of the items suggested here will cause damage, even if not the "ideal" solution. Vinegar at household strength is quite mild and will not cause horrendous damage to much of anything if used judiciously. Baking Soda is similarly fairly inert. Both have indirect virtues inasmuch as they are effective anti-odorants as well as being reasonably effective germicides and fungicides. The key with using any water-based cleaning methods on electronics is the complete removal of same at the end of the process. Peter Wieck Melrose Park, PA |
| KenO <kenitholson@yahoo.com>: Feb 19 07:52AM -0800 "white vinegar" search checked the top Google results but did not find any mention to either dilute with water or use full strength. https://hallmark.custhelp.com/app/answers/detail/a_id/3918/~/how-to-clean-a-battery-compartment-containing-corroded-alkaline-batteries. https://www.bobvila.com/articles/how-to-clean-battery-corrosion/ http://www.radioworld.com/columns-and-views/0004/vinegar-is-your friend/323304 John and Reinhard do you have any references for your recommendations? |
| KenO <kenitholson@yahoo.com>: Feb 19 08:00AM -0800 John-Del, "The first thing to try when removing battery snot is plain old water. If the plating is gone, you'll either have to replate or replace the contacts for reliable contact" I hope the plating is OK Will plain water cause additional damage if the plating is damaged? Ian, "Dry corrosion/residue is best removed mechanically - once its clean enough for reliable contact, give it a squirt of silicone spray" What do you suggest to mechanically remove the dry residue? It seems to be adherent to the contact surface (not loose and flakey). |
| Fox's Mercantile <jdangus@att.net>: Feb 19 10:08AM -0600 On 2/19/18 9:37 AM, KenO wrote: > Unfortunately the person I received the electronic device from removed > the batteries and does not remember if the batteries were zinc/carbon > or alkaline. Simple really. Alkaline batteries leave what looks like white fuzzy crystals. Some times with bluish green tint. Zinc Carbon batteries leave what looks like rusty brown sludge. That is also spread about more and not confined to just the terminals. -- "I am a river to my people." Jeff-1.0 WA6FWi http:foxsmercantile.com |
| Jeff Liebermann <jeffl@cruzio.com>: Feb 19 08:36AM -0800 On Sat, 17 Feb 2018 10:05:32 -0800 (PST), KenO <kenitholson@yahoo.com> wrote: >Appreciate any suggestions how to restore these contacts to working condition. >Thanks >Ken Replace them with shiny new contacts: <https://www.ebay.com/sch/i.html?_nkw=battery+spring+contact> If you plan to keep your "electronics unit", consider replacing the alkaline cells with rechargeable NiMH LSD (low self discharge) cells such as Eneloop. These types of cells can also leak, but in my experience much less often. <https://www.knivesandtools.com/en/ct/low-self-discharge-nimh-batteries.htm> -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| "~misfit~" <shaun.at.pukekohe@gmail.com>: Feb 19 04:41PM +1300 Once upon a time on usenet Jeff Liebermann wrote: > the area from the outside. The only way to get the crud out is to > tear it apart. > http://www.learnbydestroying.com/jeffl/pics/repair/HP%20Envy%20m6%20clogged%20fan/slides/clogged_fan.html The HP envy that I have likewise must be stripped down to where the top and bottom shells are apart to clean the fan. This is what the fins looked like when I finally got there: http://test.internet-webmaster.de/upload/1519009591.jpg I was fully intending to cut a hole in the bottom case (and make a hinged door with tape) so I could access the fan / fins for the frequent cleaning it will require but the fan lifts out *upwards* and is half under the keyboard. (In that picture the heatpipe that you can see is the one from the GPU that's already been past a smaller set of fins [out-of-shot to the right]. Behind that are the two heatpies that come directly from the 3GHz quad core i7 CPUs heat collector.) > The bottom cover comes off exposing the entire heat pipe assembly, > which is then easily cleaned. Too bad Dell (or Foxcom) designed it > into a crappy machine (Inspiron 1525) with miserable BGA soldering. I've not seen setups like that on recent machines. IMO manufacturers are using 'heatsink clog' combined with difficulty of disassembly / reassembly (with fragile plastic clips and ribbon cables) as a form of built-in obsolescence. After all CPUs and SSDs aren't becoming obsolete / underpowered as quickly as they once did... > More later. Gotta run. Cheers, -- Shaun. "Humans will have advanced a long, long way when religious belief has a cozy little classification in the DSM*." David Melville (in r.a.s.f1) (*Diagnostic and Statistical Manual of Mental Disorders) |
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