User Guide

NHB–3
Technical Documentation
PAMS
HF Desktop Charger CHH–8P
Original 26/97 Page 5
User Interface Features
HF desktop charger is designed for charging the handportable phone and the
spare battery. It provides also handsfree function when the phone is on the
charger. The unit has inbuilt HF speaker and HF microphone but the actual
handsfree function is generated in the phone. There are also three operating
buttons. The front one is for muting the HF microphone, the middle one is for
the voice mail listening and the rear one is for the spare battery discharging.
Charging takes place at a battery temperatures of 5...45 Centigrade. Charge
control of the phone is done with phone microprocessor and charge control of
extra battery is done with separate microprocessor located in a desktop stand.
Phone is always charged first, then extra battery.
A battery gives better capacity if it is occasionally discharged completely. User
can do this by using the ‘deep discharge‘ –feature of CHH–8P. This feature is
provided only extra battery slot and pressing the ‘discharge‘ –button. The extra
battery will then automatically be discharged and charged to full. If this button is
pressed twice then the discharge function is cancelled.
Charging Indication
Charge is indicated with two dual–colors led‘s, one for the phone and one for
the extra battery pack. The liquid–crystal display of the phone also contains a
three–bar battery display.
Leds are dimmed when there is no phone or extra battery connected.
Right led for handportable:
Red phone led indicates a fast charge mode of the phone battery.
Green phone led indicates that the phone battery is full and tricle charge mode
is on.
Left led for spare battery:
Red spare battery led indicates that the battery is not full; either there is a fast
charge mode active or charging is disabled due to a battery temperature or to
fast charge mode of the phone.
Green spare battery led indicates that the battery is full.
Flashing red spare battery led indicates that a discharge cycle is activated.
Charge States and Charge Control
Charge current for the phone is supplied through a series switch transistor in
the phone. When this transistor is on the charger is supplying a constant
current to the phone. This is the rapid charge mode.
When the transistor is off no current is supplied to the phone and the charger is
in the constant voltage mode.