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- Path: sparky!uunet!charon.amdahl.com!pacbell.com!ames!sun-barr!cs.utexas.edu!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!The-Star.honeywell.com!umn.edu!doug.cae.wisc.edu!siegel
- From: siegel@cae.wisc.EDU (Jeffrey Siegel)
- Subject: Cause of failure in keypads?
- Organization: Who has any organization?
- Distribution: usa
- Date: 11 Nov 92 19:53:57 CST
- Message-ID: <1992Nov11.195357.12489@doug.cae.wisc.edu>
- Originator: siegel@hp-11.cae.wisc.edu
- Keywords: failure
- Sender: siegel@hp-11 (Jeffrey Siegel)
- Lines: 18
-
-
- I have a cordless phone on which the buttons no longer
- work reliably. I took the phone apart and disassembled
- the keypad unit. It is a typical key mechanism: Some
- sort of rubbery-black-plastic which I assume is
- conductive presses against a spiral circuit board trace
- to cause a button-press event. The circuit board traces
- were dirty, so I cleaned them with rubbing alcohol and
- figured that would be the end of the problem.
- Unfortunately it wasn't. So I cleaned it again and
- rearranged the buttons (Only the '1' button doesn't work)
- with no change. When you press the '1' button, the key
- bounces and produces several '1's, obviously no good for
- dialing the phone :-( So if the circuit traces are
- clean and the plastic button works for other numbers
- on the keypad, what is the problem?
-
- Jeff
-