Panasonic KX-TCD540NZM Service Manual page 19

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Never install telephone wiring during a lightning storm.
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USE ONLY WITH Panasonic AC ADAPTOR PQLV19ALZ.
6.1.2. Charger Unit
The batteries must be fully charged before initial use of the cordless handset.
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The AC adaptor must remain connected at all times (It is normal for the adaptor to
feel warm during use).
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USE ONLY WITH Panasonic AC ADAPTOR PQLV200ALZ.
6.1.3. Optional Headset
Plugging an optional headset into the cordless handset allows hands-free phone
conversations. While using the headset, speakerphone is not available. To switch
to speakerphone, disconnect the headset.
Connecting the Optional Headset to the Cordless Handset
Open the headset jack cover, and connect the optional headset to the headset jack
as shown.
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