MXi005U OPERATIONS AND MAINTENANCE
2 MXi
CONTROLLER
The MXi control board (Assembly 31C1897) is a single-circuit assembly that provides all of the control functions
required for the MXi series of transmitters on a single circuit board. This board can be configured for a number of
different transmitter types, power levels, transmission standards and options.
Figure 2 MXi Controller
The MXi control board provides local front panel interface via ON/OFF and RESET buttons. The board
implements controls/status/telemetry for remote control through a rear panel connector that will interface to a
typical remote control systems (such as Moseley or Gentner). An RS232 serial port is also provided to allow the
operator to access the MXi through an external computer (with the appropriate software). The MXi control board
has RF detectors for forward and reflected power and all the circuitry to support AGC/VSWR/Cutback functions.
Circuitry to control and monitor the +28V power supply is also included on this board.
Figure 3 MXi Front Panel
2.1 MXi005U
C
ONTROL
B
OARD
A
SSEMBLY AND
J
UMPER SETTINGS
Figure 9 shows the assembly diagram for the control board (Part No 31C1897A2) that is used in the MXi005U
transmitter. There is only a single control board in this transmitter that performs all the control, monitoring, RF
detection and communication functions.
There are a number of jumpers on this board that are factory set and should not be altered in the field without
consulting Larcan Technical Services first. Changing the jumper settings may result in improper operation of the
transmitter.
The factory jumper settings are given here in the case that either a jumper is dislodged during shipping or has
been removed for any other reason.
Note:
This circuit board is used for a number of transmitter models and a number of components and jumpers are
not installed or used for the MXi005U application. We will only detail the jumpers that are used in this application.
E1 BDM
Enable
Allows connection of the BDM program cable to the board
Setting = NORM for all MXi005U transmitters
PUB06-76 Rev 2 July 18, 2007
06-76-2
MXi005U Operations and Maintenance
