Service Manual

MM-E 2072-09333-00
2-9
b. The main microcomputer subsystem in the LORD module controls the operation of all the
Micom-Z circuits, monitors their status, measures the various analog voltages that represent
power levels, temperatures, supply voltages, etc., and manages self-test.
The microcomputer subsystem uses the information received from the front panel
microcontroller and the PTT commands to select the desired operating mode, and stores the
operational parameters in a battery-protected memory. The calibration data is written into an
EEPROM, and therefore it is always preserved, even when backup battery is replaced.
The main microcomputer subsystem sends to the front panel microcontroller the data regarding
the current operational parameters and indications, for display on the front panel LCD.
The microcomputer subsystem also includes several UARTs, which can be used to
communicate with other equipment connected via the ACCESSORY connector, and via the
optional GPS receiver.
2-1.1.3.5 Power Supply Subsystem
The Micom-Z power source is connected via the VDC IN connector to the HI POWER module, which
includes the ON/OFF electronic switch and the input voltage protection circuits.
The ON/OFF switch, integrated with the protection circuits, is controlled by the ON_OFF_CONT line
from the front panel. It connects the supply voltage to the internal supply voltage line, SW_BATT,
when the operator turns the Micom-Z on, provided the polarity of the supply voltage is correct, and
within the allowed limits.
The SW_BATT line provides power to the local regulators on the various modules. The supply
voltage is also connected via current limiting devices to the ACCESSORY connector.
2-1.2 Micom-Z Trunk-Mount Version
2-1.2.1 Structure
The Micom-Z trunk-mount version consists of two main assemblies:
• Body assembly, shown in Figure 2-7. The Micom-Z trunk-mount version body assembly is
identical to the Micom-Z dash-mount version body assembly, but its front side has a cover that
carries the INTERCONNECTION module.
INTERCONNECTION
Front Cover
Connector for
Flat Cable
to LORD
LORD
RX Coaxial
Cable
TX Coaxial
Cable
Flat Cable
LORD - HI POWER
Rear Panel
HI POWER
Body Assembly
Flat Cable
GPS - LORD
GPS
Receiver
Backup
Battery
Internal GPS
Antenna Cable
Figure 2-7. Micom-Z Trunk-Mount Version, Structure of Body Assembly
The INTERCONNECTION module, which connects to the LORD module by a single flat cable,
provides the functions needed to enable connecting to the control head via a long cable.