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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 Power Source ???
Hi all, new in here. A friend gave me a cordless Panasonic telephone without
the power source. I picked up one at a charity shop for $2 and I am hoping it will be OK to use with it. It was given to me because a couple of the dial out buttons misbehave a bit. (especially the common two required for dialing out local calls) I thought it would be a good idea to take out in the backyard whilst relaxing having a few beers to receive calls to save me running into the house to answer calls. The sticker on the bottom of the phone requires: Power Source 12V 150mA AC Adapter The one I bought is: 12V 300mA AC Adapter Plus the sticker says "Use only with Panasonic AC Adapter" which I'm sure would be a ploy just to buy an expensive Panasonic replacement part. I am assuming it will be OK to use?? Or will it damage the rechargable battery inside? Any advice from you electronic guru's muchly appreciated!!! BTW What is the "oily like substance" between the rubber keypad and the circuit board? I have seen this on another one I pulled apart recently which was playing up so much I couldn't use it. Thanks Greetings From Downunder |
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Many of these supplies are not internally voltage regulated. Therefore, if
the supply is over rated in its current handling, it may put too much voltage across the phone. Normally you should be able to use as large a supply you want, as long as the voltage is correct. Ideally you should use the correct size of supply, unless the universal one you have is voltage regulated. If you can measure the supply output across the phone while it is connected, this would give you a good indication if its voltage is too high. If you exceed about 14 Volts across the phone, it can start to do damage by overdriving the internal components. -- Jerry G. ========================== "Deceptor" wrote in message news:1094541628.320373@webserver... Hi all, new in here. A friend gave me a cordless Panasonic telephone without the power source. I picked up one at a charity shop for $2 and I am hoping it will be OK to use with it. It was given to me because a couple of the dial out buttons misbehave a bit. (especially the common two required for dialing out local calls) I thought it would be a good idea to take out in the backyard whilst relaxing having a few beers to receive calls to save me running into the house to answer calls. The sticker on the bottom of the phone requires: Power Source 12V 150mA AC Adapter The one I bought is: 12V 300mA AC Adapter Plus the sticker says "Use only with Panasonic AC Adapter" which I'm sure would be a ploy just to buy an expensive Panasonic replacement part. I am assuming it will be OK to use?? Or will it damage the rechargable battery inside? Any advice from you electronic guru's muchly appreciated!!! BTW What is the "oily like substance" between the rubber keypad and the circuit board? I have seen this on another one I pulled apart recently which was playing up so much I couldn't use it. Thanks Greetings From Downunder |
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On Tue, 7 Sep 2004 17:29:31 +1000, "Deceptor"
wrote: Hi all, new in here. A friend gave me a cordless Panasonic telephone without the power source. I picked up one at a charity shop for $2 and I am hoping it will be OK to use with it. It was given to me because a couple of the dial out buttons misbehave a bit. (especially the common two required for dialing out local calls) I thought it would be a good idea to take out in the backyard whilst relaxing having a few beers to receive calls to save me running into the house to answer calls. The sticker on the bottom of the phone requires: Power Source 12V 150mA AC Adapter The one I bought is: 12V 300mA AC Adapter Plus the sticker says "Use only with Panasonic AC Adapter" which I'm sure would be a ploy just to buy an expensive Panasonic replacement part. I am assuming it will be OK to use?? Or will it damage the rechargable battery inside? Any advice from you electronic guru's muchly appreciated!!! BTW What is the "oily like substance" between the rubber keypad and the circuit board? I have seen this on another one I pulled apart recently which was playing up so much I couldn't use it. If the supply you bought is regulated then it'll be ok. If it is unregulated it *might* damage the phone. Wash the keypad in diluted washing up liquid, rinse in clean water and allow to dry for a few days. Wipe the PCB with a dry, lint free tissue. Hopefully normal keypad operation will resume. sPoNiX |
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sPoNiX wrote:
On Tue, 7 Sep 2004 17:29:31 +1000, "Deceptor" wrote: Hi all, new in here. A friend gave me a cordless Panasonic telephone without the power source. I picked up one at a charity shop for $2 and I am hoping it will be OK to use with it. It was given to me because a couple of the dial out buttons misbehave a bit. (especially the common two required for dialing out local calls) I thought it would be a good idea to take out in the backyard whilst relaxing having a few beers to receive calls to save me running into the house to answer calls. The sticker on the bottom of the phone requires: Power Source 12V 150mA AC Adapter The one I bought is: 12V 300mA AC Adapter Plus the sticker says "Use only with Panasonic AC Adapter" which I'm sure would be a ploy just to buy an expensive Panasonic replacement part. I am assuming it will be OK to use?? Or will it damage the rechargable battery inside? Any advice from you electronic guru's muchly appreciated!!! BTW What is the "oily like substance" between the rubber keypad and the circuit board? I have seen this on another one I pulled apart recently which was playing up so much I couldn't use it. If the supply you bought is regulated then it'll be ok. If it is unregulated it *might* damage the phone. Wash the keypad in diluted washing up liquid, rinse in clean water and allow to dry for a few days. Wipe the PCB with a dry, lint free tissue. Hopefully normal keypad operation will resume. Ditto all of the above...with one important reminder! Voltage and current are not even as important as POLARITY! In a pinch, I've used supplies of a few volts more or less than rated with good results, although I wouldn't recommend it as standard practice. We've had discussions on this group as to the idiocy of the Industry supplying thousands of different (identical-appearing) 'wall-wart' power supplies with widely varying (a.c. or d.c) voltages, currents...or differing d.c. POLARITY! Make sure your unit is correct. Usually there is a small icon near the power jack with indicates whether the tip or the sleeve of the plug needs to be positive. Use the wrong one and your phone certainly won't work. On some units the phone might also be damaged beyond economic repair. jak sPoNiX |
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Thanks guys, I'll give it a go. I don't have much to loose anyway
Hi all, new in here. A friend gave me a cordless Panasonic telephone without the power source. I picked up one at a charity shop for $2 and I am hoping it will be OK to use with it. It was given to me because a couple of the dial out buttons misbehave a bit. (especially the common two required for dialing out local calls) I thought it would be a good idea to take out in the backyard whilst relaxing having a few beers to receive calls to save me running into the house to answer calls. The sticker on the bottom of the phone requires: Power Source 12V 150mA AC Adapter The one I bought is: 12V 300mA AC Adapter Plus the sticker says "Use only with Panasonic AC Adapter" which I'm sure would be a ploy just to buy an expensive Panasonic replacement part. I am assuming it will be OK to use?? Or will it damage the rechargable battery inside? Any advice from you electronic guru's muchly appreciated!!! BTW What is the "oily like substance" between the rubber keypad and the circuit board? I have seen this on another one I pulled apart recently which was playing up so much I couldn't use it. If the supply you bought is regulated then it'll be ok. If it is unregulated it *might* damage the phone. Wash the keypad in diluted washing up liquid, rinse in clean water and allow to dry for a few days. Wipe the PCB with a dry, lint free tissue. Hopefully normal keypad operation will resume. Ditto all of the above...with one important reminder! Voltage and current are not even as important as POLARITY! In a pinch, I've used supplies of a few volts more or less than rated with good results, although I wouldn't recommend it as standard practice. We've had discussions on this group as to the idiocy of the Industry supplying thousands of different (identical-appearing) 'wall-wart' power supplies with widely varying (a.c. or d.c) voltages, currents...or differing d.c. POLARITY! Make sure your unit is correct. Usually there is a small icon near the power jack with indicates whether the tip or the sleeve of the plug needs to be positive. Use the wrong one and your phone certainly won't work. On some units the phone might also be damaged beyond economic repair. jak sPoNiX |
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Good point, I assumed the output was alternating current since he said it
was an "AC adapter", but now that I re-read the OP's note, it might have been a reference to the input voltage source. I know many of these types of units generated AC output and did the rectification and additional filtering in the phone base itself. Bob "jakdedert" wrote in message . .. Ditto all of the above...with one important reminder! Voltage and current are not even as important as POLARITY! In a pinch, I've used supplies of a few volts more or less than rated with good results, although I wouldn't recommend it as standard practice. We've had discussions on this group as to the idiocy of the Industry supplying thousands of different (identical-appearing) 'wall-wart' power supplies with widely varying (a.c. or d.c) voltages, currents...or differing d.c. POLARITY! Make sure your unit is correct. Usually there is a small icon near the power jack with indicates whether the tip or the sleeve of the plug needs to be positive. Use the wrong one and your phone certainly won't work. On some units the phone might also be damaged beyond economic repair. jak sPoNiX |
#7
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"sPoNiX" wrote in message ... On Tue, 7 Sep 2004 17:29:31 +1000, "Deceptor" wrote: Hi all, new in here. A friend gave me a cordless Panasonic telephone without the power source. I picked up one at a charity shop for $2 and I am hoping it will be OK to use with it. It was given to me because a couple of the dial out buttons misbehave a bit. (especially the common two required for dialing out local calls) I thought it would be a good idea to take out in the backyard whilst relaxing having a few beers to receive calls to save me running into the house to answer calls. The sticker on the bottom of the phone requires: Power Source 12V 150mA AC Adapter The one I bought is: 12V 300mA AC Adapter Plus the sticker says "Use only with Panasonic AC Adapter" which I'm sure would be a ploy just to buy an expensive Panasonic replacement part. I am assuming it will be OK to use?? Or will it damage the rechargable battery inside? Any advice from you electronic guru's muchly appreciated!!! BTW What is the "oily like substance" between the rubber keypad and the circuit board? I have seen this on another one I pulled apart recently which was playing up so much I couldn't use it. If the supply you bought is regulated then it'll be ok. If it is unregulated it *might* damage the phone. Chances are the phone has it's own internal regulator, so watch the polarity and hook it up, my guess is it'll work just fine. |
#8
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"Bob Shuman" wrote in message ... Good point, I assumed the output was alternating current since he said it was an "AC adapter", but now that I re-read the OP's note, it might have been a reference to the input voltage source. I know many of these types of units generated AC output and did the rectification and additional filtering in the phone base itself. Bob An "AC adapter" is simply a device (wall wart or similar) that converts household AC line voltage to whatever voltage the device requires, whether that be AC or DC is irrelevant, it's still an AC adapter since it adapts the AC line to the device. |
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On Tue, 7 Sep 2004 17:29:31 +1000, "Deceptor"
wrote: Hi all, new in here. A friend gave me a cordless Panasonic telephone without the power source. I picked up one at a charity shop for $2 and I am hoping it will be OK to use with it. It was given to me because a couple of the dial out buttons misbehave a bit. (especially the common two required for dialing out local calls) I thought it would be a good idea to take out in the backyard whilst relaxing having a few beers to receive calls to save me running into the house to answer calls. The sticker on the bottom of the phone requires: Power Source 12V 150mA AC Adapter The one I bought is: 12V 300mA AC Adapter Plus the sticker says "Use only with Panasonic AC Adapter" which I'm sure would be a ploy just to buy an expensive Panasonic replacement part. I am assuming it will be OK to use?? Or will it damage the rechargable battery inside? Any advice from you electronic guru's muchly appreciated!!! BTW What is the "oily like substance" between the rubber keypad and the circuit board? I have seen this on another one I pulled apart recently which was playing up so much I couldn't use it. Thanks Greetings From Downunder That oily goo is the rubber slowly breaking down. I've had a number of remotes and one cordless phone that suffer from the oily crap syndrome. I end up popping them apart every 6 months and cleaning them with alcohol and a rubber eraser. As everyone else mentioned, if the plug fits, and you match the polarity, voltage, and minimum current capability, it should work fine. -Chris |
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James,
Thanks for the explanation, but I already understood exactly what an "AC Adapter" is...I have even had several of the sealed variety apart and repaired them on occasion. My confusion came from the fact that the OP clearly listed the "AC" immediately after the "150ma 12V" output specification. As such when I read "150ma 12V AC" Adapter, and not 150ma 12V "AC Adapter", so I immediately thought AC output. Fact of the matter is that, like most who probably read this newsgroup, I retain these adapters when the device they powered can no longer be repaired/salvaged. After re-reading, I agree that the OP was not clear on whether the adapter output needed to be AC or DC so I thought that the advice that he be absolutely certain of the polarity was good. Bob "James Sweet" wrote in message news:_3u%c.9202$x12.2242@trnddc05... "Bob Shuman" wrote in message ... Good point, I assumed the output was alternating current since he said it was an "AC adapter", but now that I re-read the OP's note, it might have been a reference to the input voltage source. I know many of these types of units generated AC output and did the rectification and additional filtering in the phone base itself. Bob An "AC adapter" is simply a device (wall wart or similar) that converts household AC line voltage to whatever voltage the device requires, whether that be AC or DC is irrelevant, it's still an AC adapter since it adapts the AC line to the device. |
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Right where the plug goes in there should be something that looks a bit like
this: - @ ) + (the @ is just a dot though) That should indicate the polarity needed and there should be a similar marking on the wallwart. If not you can measure it. JURB |
#12
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Right where the plug goes in there should be something that looks a bit like
this: - @ ) + (the @ is just a dot though) That should indicate the polarity needed and there should be a similar marking on the wallwart. If not you can measure it. JURB |
#13
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Thanks for all the replies, all is working fine now
Right where the plug goes in there should be something that looks a bit like this: - @ ) + (the @ is just a dot though) That should indicate the polarity needed and there should be a similar marking on the wallwart. If not you can measure it. JURB |
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Thanks for all the replies, all is working fine now
Right where the plug goes in there should be something that looks a bit like this: - @ ) + (the @ is just a dot though) That should indicate the polarity needed and there should be a similar marking on the wallwart. If not you can measure it. JURB |
#15
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Cool! This is what I like; reports of success stories. There are all too
few of them posted here. Thank you, jak Deceptor wrote: Thanks for all the replies, all is working fine now Right where the plug goes in there should be something that looks a bit like this: - @ ) + (the @ is just a dot though) That should indicate the polarity needed and there should be a similar marking on the wallwart. If not you can measure it. JURB |
#16
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Cool! This is what I like; reports of success stories. There are all too
few of them posted here. Thank you, jak Deceptor wrote: Thanks for all the replies, all is working fine now Right where the plug goes in there should be something that looks a bit like this: - @ ) + (the @ is just a dot though) That should indicate the polarity needed and there should be a similar marking on the wallwart. If not you can measure it. JURB |
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