AT&T TL86109 - Manual (Page 153)

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Appendix
Troubleshooting
Common cure for electronic equipment:
If the telephone is not responding normally, try resetting the telephone. Do
the following in the order listed:
Disconnect the power to the telephone base.
Disconnect the cordless handset battery.
Wait a few minutes.
Connect power to the telephone base.
Install the battery again.
Wait for the cordless handset to reestablish its connection with the
telephone base. Allow up to one minute for this to take place. 1.
2.
3.
4.
5.
6.