14
CHRG (Yellow) - Lights when radio is first inserted in
the charger. Indicates Radio is being
"fast" charged.
(2) ON/OFF Volume Control Switch -
This switch powers the radio for operation as a mobile.
Check to assure that the UDC LATCH KNOB is in the
"engaged" position.
(3) Option Pushbutton -
This button can be programmed for many functions, but
factory programming causes the same action as the M-
RK "Clear" function. (See the M-RK Operator's Manual
LBI-38732 or LBI-38733).
(4) UDC Rotary Latch Knob -
This knob latches the M-RK personal radio in the
charger and connects the UDC connector to all circuits
within the charger to allow M-RK radio operation as a
mobile radio. It should always be latched when the radio
is in the charger and the vehicle is moving.
15
BATTERY CHARGER DETAILS
NOTE
To maximize nickel cadmium battery life, the M-RK vehicular
chargers are designed with automatic controls which limit the rapid
charging of M-RK batteries if the internal battery temperature is
below 0
°
C (+32
°
F) or above +45
°
C (+113
°
F). The charger
indicates this high or low internal temperature condition by a yellow
LED which blinks at a slow rate.
If a slow blinking, yellow LED is observed, the operator must
wait until the internal battery temperature stabilizes within the
allowable range before restarting the charging procedure by
removing and re-inserting the radio into the charger.
In a vehicular application, with either high ambient temperature
inside or outside of the vehicle, the automatic charging control will
often prevent rapid charging or limit the time of rapid charging.
In other situations, where the operator inserts and removes the
radio many times during a short period of time, the automatic control
will sense a high internal battery temperature (due to start-up rapid
charging of the battery) and will prevent further rapid charging of
the battery until the internal temperature of the battery stabilizes
within the acceptable range.
When the M-RK radio (with its battery pack) is placed in the
charger, the radio's battery pack is charged. The fast or "rapid" charge
feature, normally is applied immediately, and is controlled by the
microprocessor circuits within the charger. The following details apply
to the battery charge feature:
•
Normally, when initially placed in the charger, the battery pack is
fast charged and the yellow charge indicator glows continuously
until it is near a full charge (between 90% and 100% full charge).
At this time the charger switches to a slow or "trickle" charge rate
and completes the charge. During the "trickle" charge the green
ready indicator is illuminated.
