Larcan MXI005U Users Manual

TECHNICAL SERVICE MANUAL

MXi005U AMPLIFIER

LARCAN INC.
228 AMBASSADOR DRIVE
MISSISSAUGA, ONTARIO
CANADA L5T 2J2
PHONE: [phone]
FAX: [phone]
EMAIL: [e-mail]

PUB06-76 Rev 2
July 18, 2007

MXi005U OPERATIONS AND MAINTENANCE

CONTENTS

1 MXi005U AMPLIFIER.....................................................................................................................................................1

2 MXi CONTROLLER........................................................................................................................................................2

2.1 MXi005U CONTROL BOARD ASSEMBLY AND JUMPER SETTINGS .................................................................................2

2.2 REMOTE CONTROLS AND THE MXi005U FRONT PANEL ON/OFF BUTTON..................................................................4

2.3 EXTERNAL REMOTE CONTROL CONNECTIONS..............................................................................................................4

2.3.1 Remote Command Inputs.....................................................................................................................................4

2.3.2 Remote Telemetry Outputs...................................................................................................................................5

2.3.3 Remote Status Outputs.........................................................................................................................................5

2.3.4 External1 Interlock..............................................................................................................................................6

2.4 EXTERNAL TRANSMITTER IN TERLOCK .........................................................................................................................6

3 AMPLIFIER INSTALLATION AND STARTUP..........................................................................................................8

3.1 BEFORE APPLYING AC TO THE UNIT ............................................................................................................................8

3.2 APPLYING AC TO THE UNIT..........................................................................................................................................8

3.3 BEFORE TURNING THE AMPLIFIER ON .........................................................................................................................9

3.4 AMPLIFIER ON SEQUENCE............................................................................................................................................9

3.4.1 Tur ning ON MX i Amplifier..................................................................................................................................9

4 TEST AND TROUBLESHOOTING .............................................................................................................................10

4.1 BENCH TEST PROCEDURES .........................................................................................................................................10

4.1.1 Front-End Module Bench Test Procedure.........................................................................................................10

4.1.2 IPA1 Bench Test Procedure...............................................................................................................................10

4.1.3 Pallet 21B1751 Bench Test Procedure..............................................................................................................10

4.2 BASIC TROUBLESHOOTING TECHNIQUES ....................................................................................................................11

4.2.1 Amplifier Completely OFF.................................................................................................................................11

4.2.2 No RF Output.....................................................................................................................................................11

4.2.3 Output Reduced to 25%.....................................................................................................................................11

5 MAINTENANCE.............................................................................................................................................................12

5.1 DAILY.........................................................................................................................................................................12

5.2 MONTHLY...................................................................................................................................................................12

5.3 SEMI-ANNUALLY AND ANNUALLY .............................................................................................................................12

5.4 TRANSMITTER COOLING SYSTEM ...............................................................................................................................12

6 TEST EQUIPMENT SETUP..........................................................................................................................................13

7 SPECIFICATIONS .........................................................................................................................................................14

7.1 ELECTRICAL ...............................................................................................................................................................14

7.2 ENVIRONMENTAL.......................................................................................................................................................14

7.3 COOLING ....................................................................................................................................................................14

7.4 DIMENSIONS ...............................................................................................................................................................14

7.5 SHIPPING WEIGHT ......................................................................................................................................................14

FIGURES

FIGURE 1 MXI005U AMPLIFIER HEATSINK ASSEMBLY................................................................................................................1

FIGURE 2 MXI CONTROLLER........................................................................................................................................................2

FIGURE 3 MXI FRONT PANEL .......................................................................................................................................................2

FIGURE 4 REMOTE COMMAND INPUTS..........................................................................................................................................5

FIGURE 5 REMOTE TELEMETRY OUTPUTS ....................................................................................................................................5

FIGURE 6 REMOTE STATUS OUTPUTS ...........................................................................................................................................6

FIGURE 7 REAR PANEL SHOWING INTERLOCK TERMINAL BOARD................................................................................................8

PUB06-76 Rev 2 July 18, 2007 06-76-i MXi005U Operations and Maintenance

MXi005U OPERATIONS AND MAINTENANCE

FIGURE 8 TEST EQUIPMENT SETUP.............................................................................................................................................13

FIGURE 9 MXI005U CONTROLLER BOARD ASSEMBLY ..............................................................................................................15

PUB06-76 Rev 2 July 18, 2007 06-76-ii MXi005U Operations and Maintenance

MXi005U OPERATIONS AND MAINTENANCE

1 MXi005U AMPLIFIER

The RF section of the MXi005U Amplifier consists of a heatsink assembly that includes three cascaded
broadband amplifier modules and a directional coupler.

Figure 1 MXi005U Amplifier Heatsink Assembly

Also mounted on the heatsink is a thermal switch that protects the amplifier from over temperature conditions.

Figure 1 shows the layout of this assembly.

PUB06-76 Rev 2 July 18, 2007 06-76-1 MXi005U Operations and Maintenance

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 CONTROL BOARD ASSEMBLY AND JUMPER 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

MXi005U OPERATIONS AND MAINTENANCE

E2 Not used in the MXi005U transmitter
Setting = no jumper installed
E3 Not used in the MXi005U transmitter
Setting = no jumper installed
E4 Not installed in this assembly
E5 Front Panel ON/OFF button Mode
This jumper determines the function of the Front Panel ON/OFF button
If E5 is in the ‘INT’ position, Remote ON/OFF Controls are disabled, Local Controls Only
If E5 is in the ‘EXT’ position, Remote ON/OFF Controls are enabled, Local OFF Control Only
More detail on this function is given in Section XX of this manual

Setting = EXT for all MXi005U transmitters

E6 Transmitter Switching Interlock
This may have either a two pin header or may be permanently jumpered with bus wire
If there is a two pin header, then it requires a shorting jumper
If this is not shorted, then the transmitter will not turn ON.

Setting = Jumper installed

E7 Not used in the MXi005U transmitter

Setting = no jumper installed

E8 Not installed in this assembly
E9 Not installed in this assembly
E10 Not installed in this assembly
E11 Forward Power Sample Gain
Sets either High or Low gain from the DC sample received from the RF coupler
Set to obtain a voltage between 4.5 and 8V at TP2 for full power RF output
Can be either in the HI or LO position depending on channel and RF coupler
Typical Setting = LO for most MXi005U transmitters
E12 Not installed in this assembly
E13 Not installed in this assembly
E14 Not installed in this assembly
E15 Reflected Power Sample Gain
Sets either High or Low gain from the DC sample received from the RF coupler
Set to obtain a voltage between 4.5 and 8.0V at TP4 for 10% reflected power
Can be either in the HI or LO position depending on channel and RF coupler
Typical Setting = HI for most MXi005U transmitters
E16 AGC Disable
This jumper disables the AGC circuitry
DO not install this jumper. It is meant for factory setup

PUB06-76 Rev 2 July 18, 2007 06-76-3 MXi005U Operations and Maintenance