How do u unregister a bad Panasonic KX TGA740 handset?

The manual for the KX-TGA740 add-on cordless handset is available from the product page: http://shop.panasonic.com/support-only/KX-TGA740B.html?supportpage=true . The direct link to the manual is ftp://ftp.panasonic.com/accessory/phone_fax/om/kx-tga740_en_om.pdf . You may find more useful information on using the handset in the manual for the base phone with which you'll pair the handset. The KX-TGA740 is compatible with the KX-TG6411, KX-TG6421, KX-TG6431, KX-TG6441 and
KX-TG7431 phone systems. To find the manual for any of these models, see http://shop.panasonic.com/support . Enter the appropriate model number in the search bar and press enter. Scroll down the page to the support section if the page doesn't come up in the correct section.

I hope this helps.

Cindy Wells
(the handset will work the same even if your handset has a different letter suffix.)

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Panasonic KX-TGA650B ' Installation Manual - Page 3

It has to do with the electrical load that each ringer imposes on the line. Each set has a limit on how many handsets you can register with it. If you look on the bottom of the base you will see on the identification plate a data item called Ringer Equivalence Number or REN.

In telecommunication, a ringer equivalence number (REN) is a somewhat arbitrary number which denotes the electrical load a telephone ringer has on the line.

See "Deregistering a handset" on page 27 of this manual: http://www.fixya.com/support/p3148760-panasonic_kx_tg6441_dect_6_0_digital_exp/usermanual-90194AC-PDF

The KX-TGA740 is a cordless handset. The outgoing message is on the answering machine. Please consult the documentation for whatever answering machine you have on your phone line. If you require further assistance, please reply to this post and specify the make and model of the answering machine.

Follow the instructions beginning on page 16 of this manual: http://www.payphone.com/shop/instructions/KX-TG7433B.pdf

On the base, press menu, initial setting, registration, deregistration. Then choose the handset number you wish to deregister.

They are correct - the phones are married to the original base and can only communicate with that unit since they share frequencies. Other handsets have different frequencies ans will not work

The handset may have unregistered from the phone. The instructions to reregister it are in the manual, but I'll list them here for you.

1. On the handset, press MENU 001
2. On the base unit
For models KX-TG6021/KX-TG6022/KX-TG6023
Press and hold LOCATOR until the IN USE indicator flashes.
For models KX-TG6051/KX-TG6052/KX-TG6053/KX-TG6054
Press and hold LOCATOR/INTERCOM until the IN USE indicator
flashes.
After the IN USE indicator starts flashing, the rest of the procedure
must be completed within 1minute.
3. Press OK on the handset, then wait until a beep sounds.
4. Press OFF on the handset.

press function button on handset, scroll to initial setting, select by pressing right arrow, scroll to registration, select, select hs registration, follow directions on handset display, pressing mute on "new" base station, and ok on handset(plugged in). If you like, you can unregister with the "old" base unit first.