Useful Information54Battery rechargeMaking/answering calls, intercomI cannot activate theeco mode.L You cannot set eco mode when you set the repeatermode “On”. If required, set the repeater mode to“Off” (page 35).I cannot register ahandset to a base unit.L The maximum number of base units (4) is alreadyregistered to the handset. Cancel unused base unitregistrations from the handset (page 34).L The maximum number of handsets (6) is alreadyregistered to the base unit. Cancel unused handsetregistrations from the base unit (page 34).L You entered the wrong PIN. If you forget your PIN,contact an authorised service centre.Problem Cause/solutionThe handset beepsand/or ) flashes.L Battery charge is low. Fully charge the batteries (page10).I fully charged thebatteries, but– ) still flashes or– the operating timeseems to be shorter.L Clean the battery ends (S, T) and the chargecontacts with a dry cloth and charge again.L It is time to replace the batteries (page 10).The handset display isblank.L The handset is not turned on. Turn the power on (page15).Problem Cause/solution_ is displayed. L The handset is too far from the base unit. Move closer.L The base unit’s AC adaptor is not properly connected.Reconnect AC adaptor to the base unit.L The handset is not registered to the base unit. Registerit (page 33).L Activating one touch eco mode reduces the range ofthe base unit in standby mode. If required, turn ecomode off (page 16).Problem Cause/solutionTG7511_7521FX(e).book Page 54 Tuesday, March 9, 2010 3:22 PM