Assembly Instructions

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MXI1503-2004 CONTROL UNIT

PUB13-09 Rev 1 i

CONTENTS

1 INTRODUCTION.............................................................................................................................................................. 1

2 LCD GUI INTERFACE AND TOUCHPAD ................................................................................................................... 2

2.1 MAIN SCREEN AND TOUCHPAD OPERATIONS ................................................................................................................ 2

2.1.1 COMB Status LED ............................................................................................................................................... 3

2.1.2 AMPS Status LED ................................................................................................................................................ 3

2.1.3 COMSStatus LED ................................................................................................................................................ 3

2.1.4 LOG Status LED .................................................................................................................................................. 3

2.1.5 INTK Status LED ................................................................................................................................................. 3

2.1.6 REM Status LED .................................................................................................................................................. 4

2.1.7 ERR Status LED ................................................................................................................................................... 4

2.1.8 SubMenu Select Buttons ....................................................................................................................................... 4

2.2 COMBINED SCREEN ....................................................................................................................................................... 5

2.2.1 TRIP Status LED .................................................................................................................................................. 5

2.2.2 L/O Status LED .................................................................................................................................................... 5

2.2.3 RF Status LED ..................................................................................................................................................... 6

2.2.4 INTK Status LED ................................................................................................................................................. 6

2.2.5 PS OK Status LED ............................................................................................................................................... 6

2.2.6 COMSStatus LED ................................................................................................................................................ 6

2.2.7 AMPS Status LED ................................................................................................................................................ 7

2.2.8 SubMenu Select Buttons ....................................................................................................................................... 7

2.3 OVERALL AMPLIFIER SCREEN ....................................................................................................................................... 8

2.3.1 Individual Amplifier Screen ................................................................................................................................. 8

2.3.1.1. TRIP Status LED ............................................................................................................................................................... 9

2.3.1.2. L/O Status LED.................................................................................................................................................................. 9

2.3.1.3. INTK Status LED ............................................................................................................................................................ 10

2.3.1.4. PSOK Status LED ............................................................................................................................................................ 10

2.3.1.5. FAN1 Status LED ............................................................................................................................................................ 10

2.3.1.6. FAN2 Status LED ............................................................................................................................................................ 10

2.3.1.7. FAN3 Status LED ............................................................................................................................................................ 10

2.3.1.8. FAN4 Status LED ............................................................................................................................................................ 11

2.3.1.9. SubMenu Select Buttons .................................................................................................................................................. 11

2.3.2 Power Supply Submenu ..................................................................................................................................... 11

2.4 LOGS SCREEN ............................................................................................................................................................. 12

2.5 COMBINED INTERLOCKS SCREEN ................................................................................................................................ 12

2.5.1 AMP1 Interlock Status LED ............................................................................................................................... 13

2.5.2 AMP2 Interlock Status LED ............................................................................................................................... 13

2.5.3 AMP3 Interlock Status LED ............................................................................................................................... 13

2.5.4 AMP4 Interlock Status LED (Only for a MXi2004) ........................................................................................... 13

2.5.5 TRIP Status LED ................................................................................................................................................ 14

2.5.6 L/O Status LED .................................................................................................................................................. 14

2.5.7 EXT1 Interlock Status LED ................................................................................................................................ 14

2.5.8 VOR Status LED ................................................................................................................................................ 14

2.5.9 COMMS Status LED .......................................................................................................................................... 14

2.5.10 SubMenu Select Buttons ..................................................................................................................................... 15

2.6 AMP INTERLOCK SCREEN ............................................................................................................................................ 16

2.6.1 TRIP Status LED ................................................................................................................................................ 16

2.6.2 L/O Status LED .................................................................................................................................................. 16

2.6.3 EXT Status LED ................................................................................................................................................. 17

2.6.4 Temperature Interlock Status LED .................................................................................................................... 17

2.6.5 VOR Status LED ................................................................................................................................................ 17

2.6.6 PSOK Status LED .............................................................................................................................................. 17

2.6.7 Cutback Status LED ........................................................................................................................................... 17

2.6.8 FANS Status LED ............................................................................................................................................... 18

2.6.9 SubMenu Select Buttons ..................................................................................................................................... 18

Summary of content (45 pages)

PAGE 1
MXI1503-2004 CONTROL UNIT CONTENTS 1 INTRODUCTION.............................................................................................................................................................. 1 2 LCD GUI INTERFACE AND TOUCHPAD ................................................................................................................... 2 2.1 MAIN SCREEN AND TOUCHPAD OPERATIONS ...........................................................................................................
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MXI1503-2004 CONTROL UNIT 2.7 REMOTE CONTROLS AND RS232 SERIAL SCREEN ....................................................................................................... 19 2.7.1 Remote ............................................................................................................................................................... 20 2.7.2 NewFmt ..................................................................................................................................................
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MXI1503-2004 CONTROL UNIT FIGURE 17 MAIN CONTROL BOARD ASSEMBLY – 31C1996A1 ................................................................................................... 36 FIGURE 18 MAIN CONTROL BOARD SCHEMATIC SHEET 1 ........................................................................................................... 37 FIGURE 19 MAIN CONTROL BOARD SCHEMATIC SHEET 2 ...........................................................................................................
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MXI1503-2004 CONTROL UNIT 1 INTRODUCTION This publication describes the overall control and monitoring unit for the MXi1503 and MXi2004 Solid State TV transmitters. The main control chassis contains the Touch Screen User Interface, the Front Panel Interface board, Master Control board and +12V Control Power Supply. The main control board (Assembly 31C1972) is a single-circuit assembly that provides all of the communications and controls to the MXi Amplifiers on a single circuit board.
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MXI1503-2004 CONTROL UNIT 2 LCD GUI INTERFACE AND TOUCHPAD The user interface to the transmitter is mainly accomplished with the front panel LCD that incorporates a touchpad as an integral part of the unit. The touchpad consists of a thin membrane attached to the LCD surface which implements a software-driven menu selection system. The LCD has the capability of displaying a number of different screens, which are selected by the operator via the touchpad.
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MXI1503-2004 CONTROL UNIT The third line of the display has a number of status lights with a legend describing the particular status underneath and all enclosed in a dashed line box. When the light is fully darkened, it indicates that this particular status is true. When the light is hollow, it indicates that this particular status is false. Each status is detailed below. 2.1.1 COMB Status LED This status represents the state of the combined RF output of the MXi transmitter.
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MXI1503-2004 CONTROL UNIT If this status LED is not lit, then the operator should then check the INTK submenu to determine the source of the problem. Note that the same individual interlock status can be found on the other submenus as well, but the INTK submenu is a place where all the individual interlocks are displayed in one place. 2.1.6 REM Status LED Remote Status for the remote controls, operator controlled via the REM submenu.  Lit when the system is in REMOTE mode and enables remote commands.
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MXI1503-2004 CONTROL UNIT 2.2 COMBINED SCREEN The Combined RF Amplifier submenu is entered by pressing the COMB submenu button on the main LCD screen. This submenu displays all the various power, status and controls for the combined RF output. Each display item and control is described as to its meaning and function.
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MXI1503-2004 CONTROL UNIT When a VSWR trip occurs, the MXi controller will reset the trip automatically and repower the RF amplifier. If three trips occur within 1 minute, the Lockout status is set and the RF amplifier will remain OFF. The Lockout status can be reset by the operator using LCD touchpad, front panel reset button or a remote reset command.  Not lit when there have been no VSWR trips since the last time this was cleared. 2.2.
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MXI1503-2004 CONTROL UNIT 2.2.7 AMPS Status LED This is a combined status that indicates the condition of the RF amplifiers.  Lit when the Amp is ON and Output Power OK or Amp is Off but Thermal Interlock and VSWR Lockout are OK.  Not lit when RF power is low or either Thermal Intk is open or a VSWR Lockout has occurred. 2.2.8 SubMenu Select Buttons The fourth line of the LCD hold select buttons that will control combined operation plus allow access to a second level of submenu.
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MXI1503-2004 CONTROL UNIT 2.3 OVERALL AMPLIFIER SCREEN The RF Amplifier submenu is entered by pressing the AMPS submenu button on the main LCD screen. The main AMPS submenu displays the forward power of each of the amplifiers on the top lines and an overall status indication for each amplifier. If the amplifier is operating ok with no problems the status LED will be lit, it will be not lit when there is a problem.
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MXI1503-2004 CONTROL UNIT The third item on the first line is the AGC reference level. This is the desired power level that the automatic gain control of each amplifier will try to maintain at its output. Note that the main controller does not actually perform the AGC function but sends this AGC reference level to each of the amplifiers via the RS232 communications and the individual amplifiers will then use this level as a reference for their own AGC control circuitry.
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MXI1503-2004 CONTROL UNIT 2.3.1.3. INTK Status LED Interlock inputs that affect the RF amplifier are all closed and OK. The amplifier Ext1 interlock is the last in the chain and will only be closed if all the other previous interlocks are also true (these include Vswr, Thermal, TxSw).  Lit when transmitter is ON and all interlocks are closed (i.e., OK).  Not lit when the transmitter is either OFF or one of the interlocks are opened.
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MXI1503-2004 CONTROL UNIT 2.3.1.8. FAN4 Status LED Status that shows if FAN4 is currently operational. When the transmitter is turned ON, all the fans are turned on.  Lit when fan rotational status is true, this only happens if the fan is actually rotating.  Not lit when the fan is not rotating; if the other fans are OK, this indicates a failure. 2.3.1.9.
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MXI1503-2004 CONTROL UNIT 2.4 LOGS SCREEN The LOGS submenu is entered by pressing the LOGS submenu button on the main LCD screen. This submenu begins by displaying the first three log entries that are stored in the internal log table. If there are fewer than three entries, only those one or two log entries are displayed. The first three lines of the display are used to display log entries and the last line is used for menu button options.
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MXI1503-2004 CONTROL UNIT Figure 8 Transmitter On, Interlocks OK Screen The first line of the LCD shows the transmitter ON/OFF status and the resulting interlock status. If the transmitter has been turned ON and the Interlocks are OK, then the RF amplifier is indeed receiving the +50V power feed.. The third line of the display has a number of status lights with a legend describing the particular status underneath and all enclosed in a dashed line box.
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MXI1503-2004 CONTROL UNIT 2.5.5 TRIP Status LED VSWR Trip Status  Lit when there have been no VSWR trips since the last time this was cleared.  Not lit when the system has seen at least one VSWR trip. Note that this does not mean that there is a current VSWR trip but that one did occur. The operator may have this status as true (with no Lockout status) and still have the RF amplifier active. This can be reset by the operator using the LCD touchpad button RST or by the front panel Reset button. 2.5.
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MXI1503-2004 CONTROL UNIT 2.5.10 SubMenu Select Buttons The fourth line of the LCD has several button selections which are available to the user. Four buttons select the amplifier interlock submenus (Three in the case of an MXi1503); one button is for VSWR reset and the last exits this menu.  AMP1 = Selects the Amplifier1 Interlock Submenu LCD Screen.
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MXI1503-2004 CONTROL UNIT 2.6 AMP INTERLOCK SCREEN The Amplifier Interlock submenu is entered by pressing the appropriate AMP submenu button on the Combined Interlock LCD submenu screen. This is a level 2 submenu which is accessed from a level 1 submenu which in turn is accessed from the level 0 main screen. This submenu displays all the various interlock conditions for the amplifier. Each display item and control is described as to its meaning and function.
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MXI1503-2004 CONTROL UNIT When a VSWR trip occurs, the MXi controller will reset the trip automatically and repower the RF amp. If three trips occur within 1 minute, the Lockout status is set and the RF amplifier will remain OFF. The Lockout status can be reset by the operator pushing the RST button on the LCD touchpad. 2.6.3 EXT Status LED This is the external #1 interlock that is accessed from the rear panel of the amplifier chassis.
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MXI1503-2004 CONTROL UNIT  Not lit when the cutback voltage is over 1.2 volts (reflected power is high) 2.6.8 FANS Status LED Status that shows if all amplifier fans are currently operational. The MXi amplifier has four cooling fans in the fan assembly. This status does not indicate which fan is faulty but just that one or more of the four fans are not operational. The operator can return to the AMP submenu that is accessed from the COMB submenu to determine which of the four fans is faulty.
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MXI1503-2004 CONTROL UNIT 2.7 REMOTE CONTROLS AND RS232 SERIAL SCREEN The Remote Control submenu is entered by pressing the RCtl submenu button on the main LCD screen. This submenu displays all the various parameters that affect the remote controls and the remote RS232 status communications stream. The LCD displays a typical RCtl submenu as follows: Figure 10 Remote Control Submenu The first line of the LCD shows three parameters that can assist the operator in checking remote RS232 serial operations.
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MXI1503-2004 CONTROL UNIT 2.7.1 Remote The operator has the option of allowing remote commands or disabling them. When performing some sort of maintenance or local setups, the operator will usually disable any remote commands until the work on the transmitter is completed. If the operator has elected to disable the remote mode, be careful not to forget to put the transmitter back in Remote mode or else the remote controls will not be operational.
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MXI1503-2004 CONTROL UNIT 2.7.5 Error Serial Input Stream Error The external computer will send a four-byte serial stream of a specific format to ask for a certain action to be taken. The MXi monitors the format of this four-byte serial stream and sets the Error status if the stream has the wrong format. This is useful in determining if there is a serial transmission problem between the external computer and the MXi. This bit can be cleared by the CLR menu button on the LCD.
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MXI1503-2004 CONTROL UNIT 2.8 GENERAL SCREEN The General submenu is entered by pressing the GEN submenu button on the main LCD screen. This submenu displays all the configuration and setup information of the particular model of MXi transmitter. The first line displays the transmitter type, the second line displays the software code and revision, the third line displays the LARCAN ID number that is used in the factory to determine options, date the boards were made and other information.
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MXI1503-2004 CONTROL UNIT the date set. The operator can set the Hour and Minute of the time but seconds will be set to zero so if a person wants to calibrate to the second then if the current time is 11:40.22 then set the time for 11:41.00 and press SAVE when the reference time hits 11:41.00 Once a value is changed, the ‘NewTime’ status LED will be lit showing a new time/date has been entered. This LED will extinguish when the operator either saves the new time, resets the values or exits this submenu.
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MXI1503-2004 CONTROL UNIT  Active = The internet is currently receiving or transmitting data  RxD = Data is being received  TxD = Data is being transmitted 2.9.1 SubMenu Select Buttons The bottom line represents the menu selection buttons with a possible option of eight different selections. The operator just needs to press the touchpad (lightly) either on or just above the desired menu select button. The first seven buttons are involved in setting the Internet address and Mask Addresses.
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MXI1503-2004 CONTROL UNIT 3 FRONT PANEL INTERFACE BOARD The main controller board connects to a separate front panel interface board via a 16 wire ribbon cable. Connector J15 on the main controller board is wired to connector J1 of the front panel interface board via this 16 wire ribbon cable. The front panel interface board is located at the front of the power supply chassis whereas the controller board is located in the rear of the power supply chassis.
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MXI1503-2004 CONTROL UNIT 3.1.2 Error LED and Reset Control The front panel Error LED (DS1) is located on the front panel interface board and indicates if there is a current error condition on the amplifier. Typical Errors would be VSWR Trips, Interlocks open, Power supply overcurrent, etc. The microprocessor software code on the main controller board provides the signal to drive this LED and will illuminate it whenever a current Error Condition exists.
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MXI1503-2004 CONTROL UNIT 4 MAIN CONTROL BOARD This section describes the 31C1972 CPU Board (referred to hereafter as the Main CPU Board). This Printed Circuit Board (PC Board) is the communications center of the transmitter where all serial communications throughout the transmitter system are routed. This PC Board also handles the basic remote control functions of the transmitter system.
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MXI1503-2004 CONTROL UNIT 4.1.2 RF Metering The MXi receives two RF inputs for the combined forward (J12) and reflected (J13) powers. RF Power levels are sampled by a directional coupler located at the output of the final combiner and the resulting RF samples are detected and appropriately processed to provide DC outputs corresponding to the amplitude of the desired parameter of the input signal.
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MXI1503-2004 CONTROL UNIT When the reflected level exceeds –10dB, set coil of relay K2 is energized, causing a VSWR trip to occur. Relay K2 is a two-coil latched relay where energizing the set coil causes the contacts of K2 to move into the set position and remain there even after the coil is de-energized. Once a VSWR trip has occurred, the relay K2 will remain in the set position until a signal is sent to the other reset coil that moves the contacts back into the original clear position.
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MXI1503-2004 CONTROL UNIT comprise the basic remote functions that would be required. The CPU board also provides a RS232 interface and a RJ45 connection, either of which could be used with the In-SiNC program. 4.2.3.1. Combined Remote Controls The Transmitter MODE must be in REMOTE for any of these remote controls to be operational. The transmitter is placed in the REMOTE mode via the touchscreen. The main LCD screen has a status light to show if the REMOTE MODE is active.
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MXI1503-2004 CONTROL UNIT impedance input of at least 2K ohms should be used. Each telemetry has a description to indicate what parameter it is measuring. The MXi provides three remote telemetry outputs that represent the current operating levels of the transmitter. TX D-Connector Designation Description Pin 1 FWD PWR Forward RF power level Pin 2 RFL PWR Reflected RF power level Pin 14 AGC SET AGC Reference Level Pin 15 Ground Ground Reference 4.
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MXI1503-2004 CONTROL UNIT 5 +12 V DC CONTROL POWER SUPPLY Mounted in the control chassis between the Main Control board and the Front Panel Interface board is the +12DC Control Power Supply. This provides the +12V DC for the main control chassis as well as each amplifier. The power supply is connected to a rear panel terminal block and then wired to each amplifier. The +12VDC is turned on as soon as AC it applied.
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MXI1503-2004 CONTROL UNIT 6 TROUBLE SHOOTING There are some steps the user can take in the unlikely event that a problem occurs. The following sections list some possible problems and the steps to rectify them. 6.1 CHECK THE CONTROL POWER SUPPLY VOLTAGES No matter what the problem, it is a good idea to verify that the control power supply voltages are within tolerance. You can do this measuring the voltages found on the input power connector J21 located on the main control board.
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MXI1503-2004 CONTROL UNIT Figure 16 MXi Front Panel Interface Board Assembly 21B2537A1 and Schematic 21B2537S1 PUB13-09 Rev 1 35
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MXI1503-2004 CONTROL UNIT Figure 17 Main Control Board Assembly – 31C1996A1 PUB13-09 Rev 1 36
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MXI1503-2004 CONTROL UNIT Figure 18 Main Control Board Schematic Sheet 1 PUB13-09 Rev 1 37
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MXI1503-2004 CONTROL UNIT Figure 19 Main Control Board Schematic Sheet 2 PUB13-09 Rev 1 38
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MXI1503-2004 CONTROL UNIT Figure 20 Main Control Board Schematic Sheet 3 PUB13-09 Rev 1 39
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MXI1503-2004 CONTROL UNIT Figure 21 Main Control Board Schematic Sheet 4 PUB13-09 Rev 1 40
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MXI1503-2004 CONTROL UNIT Figure 22 Main Control Board Schematic Sheet 5 PUB13-09 Rev 1 41
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MXI1503-2004 CONTROL UNIT NOTES PUB13-09 Rev 1