Panasonic KX-TG3711BXB Service Manual page 53

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Verifying backup power supply:
Run the batch file "DAVread_only_TGA371_381.bat", which is found in the CD-ROM.
As shown in the picture below, the readout of four times detection are displayed.
The average should be within the range of 00 to 06 hex.
Press any key to continue.
The average of four readouts should be within the range of 00 to 06 hex.
Then connect a 20 ohm resistor between the two charge terminals.
Run the batch file "DAVread_only_TGA371_381.bat" again.
The average should be within the range of 18 to 34 hex.
Press any key, and shut the handset down. Remove the 20 ohm resistor.
With a 20 ohm resistor between the two charge terminals,
the average of four readouts should be within the range of 18 to 34 hex.
KX-TG3711BX/KX-TG3712BX/KX-TG3719BX/KX-TGA371BX
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