Question about HP CPQ175KB Keyboard

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2 keys on keyboard dont work

I took apart keyboard and cleaned it, still 2 keys dont work. The rubber under the keys doesnt look damaged but the it wont type the letter

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  • Anonymous Mar 19, 2014

    SILICONE KEY PAD LAYER APPEARS STRETCHED,KEYS DON'T ALIGN,BUNCHES UP IN MIDDLE

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  • 270 Answers

Send it to the manufacture caustamer care and replace it.

Posted on Jan 13, 2009

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Posted on Jan 02, 2017

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1 Answer

How do I remove "return" button which stopped working


The button itself is not the contact.

Unscrew the two halves of the keyboard by locating the screws under the rubber feet on the bottom.

Turn it upside down.
It should come apart the top key section, then a rubberised mat then the PCB then the bottom case.

When you press the key a rubber dome with a conductive pad presses against the contacts on the PCB.

Clean the contacts with switch cleaner and reassemble.

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My yamaha psr 420 has most of the middle keys not producing any sound when pressed. The others too produce an abnormaly high sound when pressed. Please whats wrong and how do i solve this problem?


Your key contacts have gotten dirty. Two contacts per key are used to sense velocity and if one doesn't work the sound will be full velocity and loud.

The contacts are conductive rubber "pills" in silicone rubber domes that the key presses down onto circuit board traces under the keys. Clean both the "pills" and the black portion of the circuit board GENTLY using ONLY 99% isoprophyl alcohol and QTips. There is a lot of disassembly required and one has to keep track of where the screws go and length and thread type to re-assemble after cleaning. Also great care must be taken to not damage the ribbon cablles connecting the top and bottom halves of the case.

Jan 11, 2011 | Yamaha NP 30 76 Key Lightweight Digital...

1 Answer

Letter "p" key not working.


pull the key out of keyboard, Press the rubber directly using any material that would fit there and check if it works...If it doesnt work then probably the place where letter P is placed is damaged...

Dec 08, 2010 | Computers & Internet

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How do I open up my Microsoft Sidewinder so I can clean/repair it?


on the bottem of the mouse there should be 3 or four small screws, if they are not visable they will be hiding under the small rubber feet, undo all of the screws using a small philips screw driver, the 2 sections of the mouse should gently pull apart, if not then get hold of a thin flat object ie a knife and gently prise the 2 sections apart you may hear some clicks as it opens, dont worry as long as you are gentle it is just the plastic casps coming apart, once opened you should hopefully be able to repair the problem, and put the mouse back together the oposite way you took it apart. hope this helps.

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Casio PX-120 Dead Key


Your on the right track. Check for grease on the contact. Clean the circuit board surface with alcohol and a q-tip and also the rubber/metalized switch.Wipe clean with other end of q-tip. Try the key again.

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I wouldn't. I would **** debris out with a vaccum.

May 24, 2009 | Gateway 2520915 Keyboard

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Keys: r, t, f, g, v, and b have stopped working. Previously they started working after about 30min, but now have stopped completely. I have cleanned the keyboard w/ compressed air and they still don't...


usually keyboards are pretty simple to clean once you take them apart.

There is a rubber (normally) surface with some black conductive poins under each key. un screw the keybard clean the contacts and put it all back together.

Note: be careful certain keyboards do not have a way of "holding" the keys in place once you take them apart. So if you arent in the mood of putting a big puzzle back together and losing 30 minutes rearranging keys (wheres that damn ~ go again?) be very careful as you pull it open.

Apr 29, 2009 | Fujitsu FPCKB41A1P Keyboard

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My son spilled soda on our keyboard.Now the x and s stick. I took it apart and cleaned it, but it still sticks. Also, a wire fell out from the space bar and I cannot figure out how to put it back.Thus the...


You cleaned the rubber under the buttons and the buttons too? All you do is put the metal bars straight down then angle it about 10 degree towards you then put it in like a regular key, but if you lost the wire then.... might need to get a new one, heh.

Dec 22, 2008 | Computers & Internet

1 Answer

EX110 Keyboard: Some Keys don't work


GandalfUK,

What can be done depends greatly on WHAT was spilled on the keyboard, AND what your experience with electronics is.

All of the keys you indicated are on the same key row as each other. The way a keyboard works is that there is a grid pattern of electronics traces(lines) that run below the membrane (Rubber or plastic seal) just below the keys. The controller determines which key you push by checking for what column connects with what row.

Well since all of the keys you have indicated seem to be from the same row, I would say that something damaged the trace for that row.

Which leads me to believe that what he spilled was something acidic (Soda, orange juice etc..)
If you have experience with electronics you can remove the control board from its casing, be sure to remember where EVERYTHING came from (Draw yourself a diagram if you have to) then inspect the board for damage. You should be able to SEE the grid patter of contact pads. there are several rows, the one you want is 3rd from the bottom. If there is OBVIOUS damage your in business. clean it up and you can buy whats called a trace pen from an electronics specialty store. This is much like a ballpoint pen but instead of ink it has metal flakes suspendend in an electrically conductive epoxy. Draw in the gap in the trace with this pen and let cure usually 5 minutes but follow the curing time on the pen if different. then you can reassemble.

If you don't see any damage then you have to use a multimeter to narrow down the location. If you don't have a multimeter or the experience to track the trace to an open. Then it would likely be cheaper to just purchase a new keyboard. Not sure what they cost in the UK but their about $30 USD which if the exchange is what I remember is about 12 Pounds.

Hope this helps
Dave

Nov 16, 2008 | Logitech Cordless Desktop EX110

5 Answers

Yamaha digital piano clp 170


This is a common problem with Yamaha keyboards. The problem is caused by worn-out rubber contacts in the keyboard assembly. In my old Clavinova CLP-500, there was one long rubber contact strip under the keys with two parallel strips of semiconductor material. The Clavinova circuitry determines key velocity by measuring the timing between when the key hits the first and second strips of semiconductor material. The harder you play a key, the less time it takes the key to hit the second semiconductor strip after hitting the first.
After years of playing the keyboard, the keys eventually cause tears in the semiconductor material and this messes up the timing measurement for key velocity. The only solution is to take the keyboard apart and replace the rubber contact strip with a new one.
I got rid of my CLP-500 four or five years ago and got a new CLP-170. The CLP-170 is now having exactly the same problem that the CLP-500 had. Yamaha has re-designed the rubber contacts in the CLP-170 so that there are now eight individual contact strips instead of one long one. The problem is essentially the same, though. You have to take the keyboard apart and replace the worn out rubber contacts.
Here are the part numbers for the rubber contacts that need to be replaced in the CLP-170: V8286600 Rubber Contact, 12 keys, D-C#   Qty. 6 V8286800 Rubber Contact, 11 keys, A-C#   Qty. 1 V8286700 Rubber Contact, 5 keys, D-C   Qty. 1
I suggest you also get a copy of the CLP-170 service manual, part number 001677. It has descriptions of all the steps necessary to take the thing apart and put it back together again. You'll also need a "rod" (which is just a long dowel), part number TX000670. Before you take the circuit boards off the keyboard assembly, you have to insert the dowel between the keys and the frame to keep the keys from falling back and getting in your way. A 5-foot long 1/4-inch dowel will probably work. (I haven't yet taken apart my CLP-170, and I don't have Yamaha's "rod," so I'm not sure if 1/4 inch is the right size or not. I'll report back here if it's not.)
Good luck, Howard

Sep 03, 2008 | Yamaha Full-Size Keyboard

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