General information

Troubleshooting

The telephone freezes.

Remove and replace the battery pack.

Press to turn on the telephone.

The telephone does not ring.

Check whether the ringer is SILENT or RINGER VOL. is OFF.

Not possible to turn on the telephone.

Check if battery is connected. If yes, charge the battery.

The telephone turn off when receiving a call and going off-hook.

Charge the battery. If still a problem change the battery as it might be defective.

Information

Error information

Improper function of the handset might be related to the installation of the DMC system or failures related to the main system.

Before declaring a handset for repair be sure that the main system is oper- ating properly.

Technical specification

Size and weight

Size: 143 x 48 x 26 mm

Weight: 121 g incl. battery ± 10 g

Capacity

Active talking time 12 hours

Stand-by time 120 hours

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Nortel Networks 7420 manual Troubleshooting, Information