HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
REGISTER   |   LOGIN   |   HELP
<<  <  Page 3/5  >  >>
OLD_CURMUDGEON
User Rank
Platinum
Re: Membrane switch reliability
OLD_CURMUDGEON   5/17/2013 1:25:13 PM
NO RATINGS
Ann,

Many decades ago I worked alonside another engineer who, in a previous employ, broke into the field of electronic engineering at the old SYLVANIA TV factory.  This was in the days of hard-wired & minimal p.c. board-equipped products.  One of his first assignments was to take a working TV, which others had designed & proven, and remove components w/ a wire-cutting pliers.  Part of this task was to document the degradation of signal, video, audio, etc.  At the point at which the TV was deemed circuit unstable, that was his end point.  The purpose?  To shave as much off the B.O.M. as possible, yet maintain a saleable product.

Although he never mentioned the outfall, I'm sure his fellow engineers in the original design dept. weren't too thrilled with his assignment.

Ann R. Thryft
User Rank
Blogger
Re: Products under Warrenty
Ann R. Thryft   5/17/2013 12:33:31 PM
NO RATINGS
OLD_CURMUDGEON, I'm with you. In fact, at my house we're no longer throwing away old appliances but getting them fixed or fixing them ourselves. The growing stream of new junk, I mean products, that doesn't work is incredible.

Ann R. Thryft
User Rank
Blogger
Re: We make appliances with membrane keypads
Ann R. Thryft   5/15/2013 4:44:12 PM
NO RATINGS
Battar, thanks for the clarification. That's interesting about damage during assembly, since so many others' comments mention poor design, which is what I've experienced. It's also not too surprising that the keypads you're using are more expensive, and better, components. Just because an appliance is low end doesn't mean it has to have components that fail quickly. I'd be happy to pay more for the option.

Mydesign
User Rank
Platinum
Re: Products under Warrenty
Mydesign   5/15/2013 12:11:33 AM
NO RATINGS
1 saves
"I have a different brand of dishwasher whose membrane keyboard had to be replaced while still under warranty. For some reason, the previously quiet dishwasher is now irritatingly noisy"

78RPM, the irritating noise is may be due to ball bearing or brush damage in motor. Its better to get it fix at the earliest; otherwise it can create more complications.
 

Battar
User Rank
Platinum
Re: We make appliances with membrane keypads
Battar   5/14/2013 3:08:15 PM
NO RATINGS
Ann, what I meant in my post is that the keypads are damaged during assembly, and the damage shows up later as a permanent fault.

Battar
User Rank
Platinum
Re: Membrane switch reliability
Battar   5/14/2013 3:04:21 PM
NO RATINGS
Ann, the keypads we use are not particulalry cheap, but they are designed for an outdoor environment.  We do individually test each membrane after assembly in the product, and we do have rejects. There have also been a few returns with contact related problems, so I won't say they are all perfect, but from my experience they are more reliable than mechanical switches. I think the problems mentioned by the readers relate to ultra-cheap components, and insufficient quality control.

Ann R. Thryft
User Rank
Blogger
Re: Membrane switch reliability
Ann R. Thryft   5/14/2013 2:18:30 PM
NO RATINGS
If Battar's company uses a membrane keypad that actually works, and DougieSellers' company makes such keypads, then why  aren't these used by all the appliance manufacturers? Are there really that many different ways to design membrane keypads that work, vs ones that don't?

Ann R. Thryft
User Rank
Blogger
Re: We make appliances with membrane keypads
Ann R. Thryft   5/14/2013 2:17:49 PM
NO RATINGS
Battar, I won't throw tomatoes at you--but I simply can't agree with this statement, based on my experience and the majority of people who comment on the subject in this and several other posts: "Membrane keypads usually fail at the time they are installed in the product." They commonly fail after a certain period of use, which is always much shorter than the life of the appliance.

Battar
User Rank
Platinum
Re: Products under Warrenty
Battar   5/14/2013 12:38:40 PM
NO RATINGS
I dont like to provide free advertising, but you did ask, so I will answer. Sangean is a far-east manufacturer of radios, including the type you are looking for and can't find. You might find what you are looking for in their catalog - I did.

William K.
User Rank
Platinum
Membrane switches and dishwashers.
William K.   5/13/2013 2:42:41 PM
NO RATINGS
We have a Maytag /whilpool dishwasher and at three years old the membrane panel is starting to peel, which is a poor reflection on the quality indeed. I replaced a similar, but older, dishwasher for a customer, (their decision), because the cost of the replacement switch was about a third of what they had paid for it six years earlier. 

What was interesting is that ohmmeter tests showed that the contacts were indeed unreliable, which, even if it were used every day for six years, is only 2190 operations, which should not wear out a switch.When the membrane panel in my home unit fails I will replace the membrane buttons with small mechanical buttons, which, even for mil-spec buttons, will be cheaper than a replacement panel.

<<  <  Page 3/5  >  >>


Partner Zone
Latest Analysis
Eric Chesak created a sensor that can detect clouds, and it can also measure different sources of radiation.
Festo's BionicKangaroo combines pneumatic and electrical drive technology, plus very precise controls and condition monitoring. Like a real kangaroo, the BionicKangaroo robot harvests the kinetic energy of each takeoff and immediately uses it to power the next jump.
Practicing engineers have not heeded Yoda's words.
Design News and Digi-Key presents: Creating & Testing Your First RTOS Application Using MQX, a crash course that will look at defining a project, selecting a target processor, blocking code, defining tasks, completing code, and debugging.
Rockwell Automation recently unveiled a new safety relay that can be configured and integrated through existing software to program safety logic in devices.
More:Blogs|News
Design News Webinar Series
3/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
2/27/2014 11:00 a.m. California / 2:00 p.m. New York / 7:00 p.m. London
12/18/2013 Available On Demand
11/20/2013 Available On Demand
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Apr 21 - 25, Creating & Testing Your First RTOS Application Using MQX
SEMESTERS: 1  |  2  |  3  |  4  |  5


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: April 29 - Day 1
Sponsored by maxon precision motors
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service