AT&T TL90078 user manual Replacing a handset, You may need to deregister your handsets if

Appendix A

Replacing a handset

You may need to deregister your handsets if:

You have twelve registered handsets and need to replace a unit.

-OR-

You wish to change the designated handset number of your registered handsets.

You must first deregister ALL the handsets, and then re-register each handset you wish to use.

Please read carefully through all the instructions on this page before beginning the deregistration process.

To deregister all handsets

1.Press and hold HANDSET LOCATOR on the telephone base

for about 10 seconds (until the IN USE light turns on and starts to flash), then release the HANDSET LOCATOR button.

2.Immediately press and release HANDSET LOCATOR again. You must press HANDSET LOCATOR while the IN USE light is still flashing. (The light flashes for about seven seconds. If the light stops flashing, pick up the handset and place it back into the telephone base, then start again with step one above.)

3.The handset(s) will show SEARCHING FOR BASE and it will take about 10 seconds to complete the deregistration process. ALL handsets will show NOT REGISTERED if deregistration was successful.

4.To re-register the handset(s) to the telephone base, follow the registration instructions on page 11.

NOTES:

1.If the deregistration process was not successful, you may need to reset the system and try again. To reset: pick up the handset and press the HOME/FLASH button, then press the OFF/CLEAR button and place the handset back into the telephone base. You may also reset by unplugging the power from the telephone base and plugging it back in.

2.You cannot deregister the handset(s) if any other system handset is in use.

3.Even if the battery is depleted, you can still deregister the handset by following the steps above. After the handset is charged for at least 10 minutes, the screen shows NOT REGISTERED.

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