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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Cordless phone doesn't beep when put to charge
Hello
I have a Sanyo 900MHz cordless phone (model CLT-9922). In recent weeks, when I put it on the base unit to charge, I don't hear a *beep* sound which confirms that charging is taking place. However, the LED on the base unit does light up as if to indicate the phone was actually charging. But I know no charging is taking place after finding the phone dead after leaving it on the base unit for a couple of days. The phone is just over a year old so the warranty is over. The funny thing is, if you keep trying to put the phone on the base unit, after the 20th time you may actually hear a *beep* and the phone will charge. What could be the cause of this behaviour? Thanks in advance H |
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"Hank" wrote in message snip The funny thing is, if you keep trying to put the phone on the base unit, after the 20th time you may actually hear a *beep* and the phone will charge. What could be the cause of this behaviour? Dirty contacts. Regardless of how they look, take an eraser and clean them. For some reason, there are a bunch of devices that behave like this. I believe it has something to do with dissimilar metals used in the contacts building up oxides. |
#3
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Hank wrote: Hello I have a Sanyo 900MHz cordless phone (model CLT-9922). In recent weeks, when I put it on the base unit to charge, I don't hear a *beep* sound which confirms that charging is taking place. However, the LED on the base unit does light up as if to indicate the phone was actually charging. But I know no charging is taking place after finding the phone dead after leaving it on the base unit for a couple of days. The phone is just over a year old so the warranty is over. The funny thing is, if you keep trying to put the phone on the base unit, after the 20th time you may actually hear a *beep* and the phone will charge. What could be the cause of this behaviour? Thanks in advance H Hi... Get a hold of a new pencil, or one that at least has a new-ish clean unused eraser. Use the eraser to gently scrub the contacts on both the phone and charger until they're clean looking and shiny. Ken |
#4
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"Terry" wrote in message . .. Dirty contacts. Regardless of how they look, take an eraser and clean them. For some reason, there are a bunch of devices that behave like this. I believe it has something to do with dissimilar metals used in the contacts building up oxides. Excellent suggestion. And/or maybe wipe off any grease with a bit of that car lock de-icer alcohol? Our GE 900 cordless did the same sort of thing. After we mislaid handset for about a week. When found, handset battery which was supposedly OK since it had been replaced a few months ago, was completely flat. It has taken at least a week and a half for the battery recharge. Now normal So could be a bad cell/s? Maybe you had a cell get reverse polarized from it running so low, but I'd suspect that wouldn't correct itself. Perhaps also the contacts are a bit high resistance so it took allot longer to charge. It's funny, I have an old phone (~10years) that never had any trouble with the contacts, no matter what. I now have a cheapy that often has issues with not wanting to charge until I clean up the contacts, go figure. It must be something to do with the type of metal(s). In reference to dissimilar metals/oxidation etc. causing 'dirty contacts', a common fault back designation in the days of relays! Especially if you didn't REALLY KNOW what the problems was! You had to write something in the trouble log :-); see also 'contact wetting'. 'Contact wetting' was/is the recommended practice of having a few microamps flow through an electrical contact that was not otherwise carrying any DC current (voice circuit relay contact, audio jack etc.) offset contact oxidation. Not possible of course with the contacts of a tel. handset that is detached from the base. I think this is still commonly done when miniscule amounts of current are involved (like line-level audio) and plugs/jacks are being used. I believe it's also done with potentiometers to insure that they conduct the signal. |
#5
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Forget all the cleaning the contacts.
Replace the batteries.............. "Ken Weitzel" wrote in message news:xZuUd.522992$8l.255972@pd7tw1no... Hank wrote: Hello I have a Sanyo 900MHz cordless phone (model CLT-9922). In recent weeks, when I put it on the base unit to charge, I don't hear a *beep* sound which confirms that charging is taking place. However, the LED on the base unit does light up as if to indicate the phone was actually charging. But I know no charging is taking place after finding the phone dead after leaving it on the base unit for a couple of days. The phone is just over a year old so the warranty is over. The funny thing is, if you keep trying to put the phone on the base unit, after the 20th time you may actually hear a *beep* and the phone will charge. What could be the cause of this behaviour? Thanks in advance H Hi... Get a hold of a new pencil, or one that at least has a new-ish clean unused eraser. Use the eraser to gently scrub the contacts on both the phone and charger until they're clean looking and shiny. Ken |
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