MITSUBISHI ELECTRONICS AMERICA, INC.
ST200 Series Technical Support Manual
13
January 2000
NOTE:
The connection of the TU to either the Base Unit or the TMU must be firmly secure.
To ensure proper connections after inserting the TU into the Base Unit, adjust latches
(located on BOTH sides of the Base Unit) to the “L” or
locked
position.
4.7.2 Battery Pack
The SZ511A Battery Pack provides DC voltage for operating the OmniQuest
®
MT. The Battery
Pack is comprised of NiMH Battery cells (similar to some cellular telephones) and provides for
the storage of energy to provide DC power (see specifications for ratings). The Battery Pack can
be charged through use of the AC Adapter/Charger from an external 115 VAC / 60 Hz power
source while installed in the OmniQuest
®
Base Unit or when removed as discussed below.
NOTE
: There are several handling, storage, and charging considerations for increasing the
performance and lifetime of NiMH Battery Packs. Please refer to the ST251 Operating
Instructions for details.
NOTE
: The standard Battery Pack is rated to provide for > 1 hour of talk time at 77
o
F / 25
o
C.
Because the MT is voice activated, the typical conversation time obtained from a fully
charged Battery Pack could be > 2 hours.
NOTE
: There are several operational considerations concerning battery run time, which should
be well understood by the users. Please refer to the ST251 Operating Instructions or
section 5.11 for details.
NOTE
: This Battery Pack has been designed specifically for use and operation with the
OmniQuest
®
ST251 MT. Do not attempt to use other batteries with this unit.
4.7.3 OmniQuest
®
AC Adapter/Charger
The SZ503A AC Adapter/Charger provides two methods for charging the Battery Pack as well
as providing DC power output for operations. The DC output cable of the AC Adapter/Charger
can be used for trickle charging a battery pack installed in the OmniQuest
®
MT and/or for
powering the MT during operation when connected to the DC Input Connector of the MT.
Alternately, the Battery pack can be removed from the MT and attached directly to the unit for
charging. Rapid charging of the battery takes approximately 2 hours. When the MT is powered
on and in transmit mode, rapid charging changes to trickle charging and may take up to 24 hours
if the MT is continuously transmitting (e.g., in data mode).
NOTE:
When the battery pack is fully charged, the indicator light on the SZ503A will change
from red to green (for either the “spare” battery pack or the “main” battery pack inside
the base unit). Prompt removal of the battery is required to avoid overcharging, and
potential damage to the SZ511A battery pack.
The DC output cable of the SZ503A is approximately 1 foot (32 cm) in length and is hard wired
directly to the AC Adapter/Charger. The plug at the end of the DC output cable is a special 4-pin
connector which mates to the DC Input connector of the Base Unit. The AC input cable for the
AC Adapter/Charger is approximately 6 feet (1.8 m) in length. The cylindrical objects attached
