Question about Panasonic Cell Phones
The In use display on the hand set confirms that the hand set has a faulty message.
Now if the telephone line is checked , it must be about +50 volts . Now if the line on connection drops to less than +10 Volts then there is a short in the dialer.
If on removal the voltage comes back then it is confirmed..
Now there is a dialer IC and a switching device- can be high speed switching transistor. Please check the transitor and the IC for short or that they trigger with a false signal.
If so disconnect the signal that switches to trace it to the dialer or the processor IC.
Only if the line to the phone is connected and shows the full voltage then the fault is isolated and the disconnected components or section must be probed.
Posted on Apr 08, 2011
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Posted on Jan 02, 2017
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