Panasonic KX-TG3711BXB Service Manual page 52

KX-TG3711BX/KX-TG3712BX/KX-TG3719BX/KX-TGA371BX
L
Adjustment of backup power supply:
Supply a handset with 2.6V power, then connect serial JIG cables.
The power should be DC 2.6V
Run the batch file "DAVchk_TGA371_381.bat", which is found in the CD-ROM.
Read and confirm the display data. If successful, "OK" is displayed as below.
Press any key, and verify backup power supply.
O K
In case "FAIL" is displayed, read description in the next line.
Refer to the picture below.
Shut down and restart the handset, then try the adjustment again if "EEPROM writing error. "Try again." is shown.
Check model number if "Wrong model. Check model No." is shown.
Reject the handset if "Return value of DAV command is wrong" is shown. In this case, the handset is defective.
You can press any key to continue.
FAIL
Description
+
0.02V between BAT and GND.
52