SOURCE: I have a Panasonic KX-TG6051CM
I had the same problem, and it seems that the battery charging circuit in the handset had locked up, constantly charging the battery until it overheated. I was able to reset the circuit in my handset by completely draining the battery. Here is the procedure:
1. Remove the handset from the charging cradle, and leave it on for a few days until the battery runs out, and the handset finally turns off. At his point, the battery will be very low, BUT NOT COMPLETELY DRAINED.
2. Next, you must manually drain the charge remaining in the battery by shorting out the two contacts on it. Shorting won't damage the battery, since it is holding very little charge at this point. An easy way to physically do this is to remove the battery, and place a piece of thin wire across the the two contacts of the HANDSET. I am referring to the contacts inside the handset that connect to the battery, NOT the contacts on the bottom outside that connect the handset to the charging cradle. Next, put the battery back in, sandwiching the wire between the battery's contacts and those inside the handset. This will hold the wire in place. DO NOT PUT THE HANDSET BACK INTO THE CHARGER, WITH THE BATTERY SHORTED OUT.
3. Wait about 30 minutes for the battery to completely die. Remove the jumper wire, and but the handset back into the charger.
4. If the battery was fully discharged , you will get a message on the handset telling you that you should let it will charge for 7 hours. If you do not get this message, then either the battery was not fully discharged, or your problem is different from mine. Try the procedure again in Step 3 for another 30 minutes to discharge the battery some more.
5. If you get the "Wait for 7 hours to charge" message on the handset, then leave it in the charging cradle for the 7 hours requested. After that, it should work fine.
Let me know how you make out.
SOURCE: Handset voice very low and LCD display is blank
My 1740 handset volume was also low. As a shot in the dark I changed the speaker and it fixed the problem. I got a new speaker from www.panasonic.com .
SOURCE: sync a new handset to kx-tg5632 phone
This works on MY panasonic; May work on yours too!
Registering a handset
The included handset and base unit are
preregistered. If for some reason the
handset is not registered to the base
unit, register the handset.
1 Handset:
{MENU} i {0}{0}{1}
2 Base unit:
Press and hold {LOCATOR/
INTERCOM} until the IN USE
indicator flashes.
LAfter the IN USE indicator starts
flashing, the rest of the procedure
must be completed within 1
minute.
3 Handset:
Press {OK}, then wait until a beep
sounds.
4 {OFF}
Registering an additional handset
See page 5 for information on the
available model.
Start from step 2.
SOURCE: Panasonic base unit went dead
THROW IT AWAY. I HAVE THE SAME PROBLEM AND PANASONIC AFTER SALES "SERVICE" PEOPLE HAVE BEEN COMPLETELY USELESS!
SOURCE: Panasonic Kx-tea 308 low volume
If you have to eat the system, I'd suggest butter, salt and pepper LOL
Seriously, what happens when you plug a regular phone directly into the outside lines? Or, better yet, plug a regular phone into jack 01 and TURN OFF THE POWER on the phone sytsem.
Now you have a phone wired to the outside line. If you can hear on those, then you may have a line current issue, or something else. If you can't, the telco is obligated to give you a line you can hear on. If they can't deliver, try an alternative like Vonage.
Carl
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