Brand: Panasonic
Category: Cordless Phone
Document Type: Manual
Language: EN
Manual for KX-TU400 EX
Uploaded: Nov. 21, 2025, 6:24 p.m.
Warranty Information
Refer to the dealer or supplier for warranty information.
- Phone Overview: Familiarize yourself with the phone's physical layout and buttons.
- Status Icons: Understand the meaning of icons displayed on the screen (e.g., signal strength, battery, messages, Bluetooth).
- Key Functions: Learn the purpose of each key, including soft keys, dial/answer, end/power, navigation, and number keys. Special functions for '*' and '#' keys are also explained.
- Getting Started: Instructions on installing SIM cards and the battery, charging the battery, powering the phone on/off, and connecting to the network.
- Dialing Calls: How to make calls, including international calls, calls from the phonebook, and redialing. Also covers answering and rejecting incoming calls.
- Using the Headset: Instructions for connecting and using a headset.
- Input Methods: Details on numeric and English input, including shifting between methods and inserting symbols.
- Menus: Explanations for accessing and using various phone menus, such as Phonebook, Messages, Call center, Camera, Multimedia, Organizer, File manager, Settings, Priority Call, and Fun (games).
- Appendix: Contains important safety information, troubleshooting tips, and sales department contacts.
Troubleshooting and error codes
| Fault | Cause | Solution |
|---|---|---|
| SIM card error | The SIM card is damaged. The SIM card is not in position. The metal face of the SIM card is polluted. |
Contact your network service provider Check the SIM card Clean the SIM card with a clean cloth |
| Poor received signal quality | Signals are obstructed. For instance, radio waves cannot be effectively transmitted nearby a high building or in a basement. Line congestions occur when you use the mobile phone in high-traffic hours |
Move to a place where signals can be effectively transmitted Avoid using the mobile phone in hightraffic hours |
| The mobile phone cannot be powered on | The battery energy is exhausted. | Charge the battery |
| Calls cannot be dialed | Call barring is activated | Cancel call barring |
| The mobile phone cannot connect the network | The SIM card is invalid The mobile phone is not in a service area of the GSM network The signal is weak |
Contact your network service provider Move to the network operator's service area Move to a place where the signal quality is high |
| The battery cannot be charged | The charging voltage does not match the voltage range indicated on the charger An improper charger is used Poor contact |
Ensure the charging voltage matches the voltage range indicated on the charger Use the charger specially designed for the mobile phone Ensure the charger plug is in good contact with the mobile phone |