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16 MBU 400 Installation Guide
Installing and Registering the Handset
1. On the back of the phone, insert your thumbnail into the slot at the
bottom of the phone, and pull up.
2. Insert the Lithium-ion battery face-up into the handset, making sure
that the contacts on the battery connect to the contacts in the body of
the phone as shown in the illustration, and then replace the battery
cover to the back of the phone.
3. Connect the Handset Charger Base Power Adapter to the 420d
Handset Charger, and plug-in the other end to an active power outlet
(preferably a continuous outlet without a switch to interrupt its
power).
Contacts of Battery
AC 110/220V
420d Handset Charger
Power Adapter
420d Handset Charger
Installing the MBU 400