Useful Information

Troubleshooting

If you still have difficulties after following the instructions in this section, disconnect the base unit’s AC adaptor and turn off the handset, then reconnect the base unit’s AC adaptor and turn on the handset.

General use

Problem

The handset does not turn on even after installing charged batteries.

The unit does not work.

The handset display is blank or dark.

I cannot hear a dial tone.

Cause/solution

RPlace the handset on the base unit or charger to turn on the handset.

RMake sure the batteries are installed correctly (page 9).

RFully charge the batteries (page 10).

RCheck the connections (page 9).

RUnplug the base unit’s AC adaptor to reset the unit and turn off the handset. Reconnect the adaptor, turn on the handset and try again.

RThe handset has not been registered to the base unit. Register the handset (page 27).

RThe handset is in screen saver mode (page 13). Activate the handset display again by:

pressing MN when on a call.

pressing MeN at all other times.

RLCD in chargingis set to Offwhile on charge. Change the setting (page 22).

RThe handset is not turned on. Turn the power on (page 13).

RMake sure that you are using the supplied telephone line cord. Your old telephone line cord may have a different wiring configuration.

RThe base unit’s AC adaptor or telephone line cord is not connected. Check the connections.

RDisconnect the base unit from the telephone line and connect the line to a known working telephone. If the working telephone operates properly, contact our service personnel to have the unit repaired. If the working telephone does not operate properly, contact your service provider/telephone company.

Programmable settings

Problem

The display is in a language I cannot read.

I cannot activate the eco mode.

Cause/solution

RChange the display language (page 13).

RYou cannot set eco mode when you set the repeater mode On. If required, set the repeater mode to Off(page 28).

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Panasonic KX-TG7851TU operating instructions Troubleshooting, General use, Programmable settings, Problem