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The Panasonic cordless phone that I had a negative 12v power supply. I accidently applied a positive power and found fumes from the equipment. I opened to see that the IC which could be the rectifier has burnt. How can I repair it and what is the IC spec ? Please advise

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First of all you must understand the power interface circuit.Mainly it has two line filter coils at very much start after the DC in socket, they usually get burnet when connected to the reverse supply rail, if you have these filter coils replace them first, if do not have, just bypass them.After these coils, rectifier IC can be found, it is rectangular in shape, has four connections, looks like an SMD IC, about 5 mm at lenght , 3 mm at width, this can simply be replaced with four diodes in bridge configuration.You can easily identify its pins configuration by tracing the tracks. The connections going to the DC socket are input and interchangeable, the other side tracks are connected to the regulation section and can be identified with an electrolytic capacitor fixed directly to the connections of rectifier.The polarity identification is directly read from the capacitors polarity.Check upto this stage & email me after testing the power interface section with the model number.

Posted on Aug 09, 2008

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Contact the manufacture sales rep to find out where you can purchase a power supply for the country you are going in to. This is the best solution.

If you want to use a step down transformer for your present power supply, make sure it is a true transformer and not one of these solid state devices for this. The solid state ones will damage the power supply for the phone.

The other aspect for this, is that in some countries the load impedance standard is not all the same. This will effect the performance of the phone.

With cordless phones, there are regulations for the frequency bands used. Not all cordless phones are legal in different countries. Many of them have their own regulations.

Personaly, because these phones are so cheap now-a-days, I would buy a new one in the country of destination. This way, I know it will work properly and meet their regulations.


Jerry G.


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