Question about Panasonic Lands Phones

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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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Orange/black.....Dashlight/dimmer
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Wireing diagram


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