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The battery packs should be fully charged in an appro-
priate charger before they are placed into service. This ap-
plies to new battery packs received from the factory and to
battery packs that have been stored for long periods of time.
A fully charged battery pack should have an open-terminal
voltage greater than 7.5 Volts (typically 9.0 Vdc). The low
battery alert tone will sound when the battery pack needs
charging.
UNIVERSAL DEVICE CONNECTOR
The UDC is located on the side of radio just above the
PTT and Monitor Buttons. Various equipment such as the
audio accessories can be connected to the radio via the UDC.
The programming equipment is also connected to it when the
personality is programmed into the radio. The UDC fur-
nishes an excellent first-check-point for initial bench checks
without the need to disassemble the radio. Table 2 lists all
pins and their appropriate function. When the radio is turned
on it senses the resistance value between UDC pins 9 and 1
and switches the appropriate circuits to provide proper radio-
to-accessory operation.
SIDE VIEW FRONT VIEW
Figure 1 - MTL-SX Portable Radio
LBI-38433
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