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1-Press the hangup key (represented by a red phone) and the "#" key at the same time for at least five seconds.
2-Select "Deregister hs." Choose the handset and press the "Select" key (which also shows an envelope for messages).
Choose "Yes" to confirm deregistration. The phone clears its registration information from the base and deletes the link from its memory. The message "Handset not registered -- place handset on base to register. See owner's manual for help" now shows on the display. If you are out of range of the base, "Out of range" shows.
4-Place the handset in the base charging cradle. The phone automatically selects a new security code from those stored in the base.
5-Make sure your phone is working again after "Registration Complete" shows on the display
Hope this will Help.
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Open the hand set by Removing battery, remove 2 screws under battery, carefully open handset casing by prying open with thin bladed screwdriver, remove pc board by removing 3 retaining screws, on opposite side of pc you will see contacts for handset buttons clean with eraser and reassemble handset.
I know you may not have experience in taking apart the handset or small electronic repair but, it is actually very easy to do. I just bought the same phone set from goodwill for $6.99. The set looks great and actually almost in new condition.
However, I had the same problem with just one handset so, I figured it out so, my set would work properly and now after I fixed it, I have no problems and every handset works great.
Follow these instructions step by step and I assure you it will work again like new.
Step 1.) Take the battery cover off on the back of the handset and pull the cord out carefully from the battery wire to where it connects to.
Step 2.) Unscre the two screws that you see inside. Then, carefully seperate the front cover from the inside of the phone to gain access to the inside of the phone so, you will have access to the 3 small screws that will seperate the circuit board to gain access to the keyboard.
Step 3.) After removing the circuit board and taking out the keyboard and rubber keyboard pad. Carefully wipe all of the buttoms very rigously with an alcohol wipe pad and you will start to notice some plastice film start to come off. This is what you want to remove beacuse, somehow it causes those keys to stick.
Step 5.) After wipeing them clean and reinserting the pad to the cover, the screws in the holes, aliging everything back together and snapping the cover back on, screwing the 2 screws back in and replacing the battery and cover. Test it and you will se that it works just like it did when the phone was brand new.
Hope it worked for you like it did for me and good luck. :)
Same manual as lethean provided on a similar post but Page 24 if the previously used Base is Unavailable and your phone shows "Deregistration" in the Menu.
Base Unavailable (Handset Only)
To clear the base registration data in the handset, please follow these steps:
Press and hold  and [#] for more than 5 seconds. Select the BASE UNAVAILABLE submenu.
BASE UNAVAILABLE appears. Move the cursor to select YES, and then press the OK soft key.
ARE YOU SURE? appears. Move the cursor to select YES. Press the OK soft key.
Here are the instructions and a link to the manual :
From the Handset Setup Menu:
1. Press the caller ID-volume ( 6 or 5) button to scroll to the KEY TONE sub-menu.
2. Press mute/program button to enter the menu. SET KEY TONE 41ON 2 OFF shows in the display. The default setting is 1ON.
3. Use the touch tone pad on the handset to select 1 or 2, or use the caller ID-volume ( 6 or 5) button to scroll to your selection.
Here is a link to the manual for you :
My handset does not connect to the base station. It flashes momentarily, but does not find the base. The base station has a humming noise when the phone line is disconnected and the talk button is depressed. Hum is also present when the phone line is reconnected. The problem was resolved by replacing the 9VDC power supply. The hum disappeared and the handset immediately connected to the base.