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Summary of Contents for Larcan MXi101V
- Page 1 TSM21Q-365 MXi101V AMPLIFIER TECHNICAL SERVICE MANUAL LARCAN INC. 228 AMBASSADOR DRIVE MISSISSAUGA, ONTARIO CANADA L5T 2J2 PHONE: (905) 564-9222 FAX: (905) 564-9244 EMAIL: techservices@larcan.com TSM21Q-365 Rev 0 July 17, 2009...
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Page 2: Table Of Contents
............................4 ERYLLIUM XIDE ARNING ............................4 THER OXIC ATERIALS ...............................4 ANGEROUS OLTAGES 2.3.1 Switch to Safety ..............................5 LARCAN PARTS, ASSEMBLIES, ASSEMBLY DRAWINGS AND SCHEMATIC NUMBERS......7 ...........................7 ENDOR TANDARD UMBERS LARCAN N ...............7 UMBERS FOR ARTS SSEMBLIES AND OCUMENTATION ..............................8 EADED ESISTORS 1/4W ......................8... -
Page 3: Mxi201U Amplifier-Introduction
It also covers the transmitter’s start-up operation, and troubleshooting, as well as basic transmitter maintenance guidelines. The RF section of the MXi101V Amplifier consists of a heatsink assembly that includes three cascaded broadband amplifier modules and a directional coupler. Figure 1 shows the layout of an MXi201 assembly. The MXi101V utilizes one of these output amplifiers only. -
Page 4: Safety Notices
MXI101V TECHNICAL SERVICE MANUAL SAFETY NOTICES This section provides general guidance and information for the operation, maintenance, and service personnel who are familiar with the hazards of working with high-powered electronic circuits. This manual does not detail all of the safety precautions which should be observed when servicing this or any other electronic equipment. -
Page 5: 2.3.1 Switch To Safety
MXI101V TECHNICAL SERVICE MANUAL Rule #1 KILL THE AC POWER BEFORE IT KILLS YOU Under no circumstances should any person reach within the cabinets for the purpose of servicing or adjusting the equipment without first disconnecting the AC power or without the immediate presence of another person capable of rendering aid. - Page 6 MXI101V TECHNICAL SERVICE MANUAL Avoid wearing loose clothing and personal jewelry such as rings, watches, and chains when working near energized circuits. Make a habit of removing all jewelry and storing it in a safe place as soon as you enter the transmitter building.
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Page 7: Larcan Parts, Assemblies, Assembly Drawings And Schematic Numbers
UMBERS FOR ARTS SSEMBLIES AND OCUMENTATION An index of LARCAN specified number are used to define and specify the following: • parts made by a manufacturer to LARCAN specification; • an assembled unit or “group” such as a PC Board or completed cabinet;... -
Page 8: Leaded Resistors
MXI101V TECHNICAL SERVICE MANUAL 3.3 L EADED ESISTORS Generic carbon composition resistors with leads are numbered as follows: nnnx - or - Power Rating Resistance Value * Tolerance 152 = 1/4W nn - first digits of K =10% 77 = 1/2W resistance (5, 10% tol.) -
Page 9: Urface Ount Apacitors
MXI101V TECHNICAL SERVICE MANUAL Example: 9C08052A1001FK (Size 0805, Power Rating 1/10W, Resistance 1kohm, Tolerance 1%, Temperature Coefficient 100ppm/°C) 3.5 S URFACE OUNT APACITORS There is no specifically recommended supplier of these parts. The part numbering system being used is based on... - Page 10 MXI101V TECHNICAL SERVICE MANUAL A revision letter or number may follow the model or group number marked on the nameplate, chassis, or circuit board; or on the parts list (where it is an "R" followed by a dash and a number). Whenever a revision letter or number appears, it should be quoted in any communication regarding the equipment.
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Page 11: Igure 1 Mx I Amplifier Heatsink Assembly
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE CONTENTS MXi CONTROLLER ..............................12 AMPLIFIER INSTALLATION AND STARTUP .......................14 ..........................14 EFORE PPLYING TO THE ............................14 PPLYING TO THE ON ........................15 EFORE URNING THE MPLIFIER ON S ............................16 MPLIFIER EQUENCE 2.4.1 Turning ON MXi Amplifier ..........................166 TEST AND TROUBLESHOOTING ..........................17 ........................17 ASIC... -
Page 12: Mxi Controller
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE 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. -
Page 13: Amp) S Ubmenu
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE Forward (FWD) and Reflected power (RFL), AURal power, AGC and CUTBack (VSWR) control voltage, as well as the heatsink TEMPerature (Optional) can be displayed by selecting the AMP submenu as shown in Figure 5. Figure 5 Amplifier (AMP) Submenu Similarly, pressing the power supply P/S submenu from the Main Menu displays the power supply voltage and current consumption as well as its status. -
Page 14: Amplifier Installation And Startup
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE AMPLIFIER INSTALLATION AND STARTUP The MXi Amplifier was fully tested at LARCAN before it was delivered. Under normal circumstances, the transmitter can be fully operational with minimal setup when turned ON. However, a good practice is to take the “start from scratch”... -
Page 15: Before Turning The Amplifier On
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE Figure 7 Main Menu 2.3 B EFORE URNING THE MPLIFIER From the Main Menu, the status of the amplifier is displayed and shows if the amplifier is ready for operation. Status legends, when lit, such as the INTK (INTERLOCK), usually signify OK conditions and that the transmitter is ready to be turned ON. -
Page 16: Amplifier On Sequence
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE • Push the Front Panel ON/OFF button so that it is NOT pushed in. ON S MPLIFIER EQUENCE Upon depressing the ON button, the fans start and at the same time the +50V power supply is enabled, thus applying power to the MXi Amplifier. -
Page 17: Test And Troubleshooting
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE TEST AND TROUBLESHOOTING ASIC ROUBLESHOOTING ECHNIQUES One of the best tools in troubleshooting is knowing what the nominal figures or typical values of the MXi amplifier when it is at its normal performance. If a fault condition occurs, then you can compare the data taken previously with the present conditions and come up with a reasonable conclusion about what is at fault. -
Page 18: Maintenance
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE MAINTENANCE Equipment which is regularly and carefully maintained is far less likely to be subject to sudden failure than that which is operated without regard to basic maintenance requirements. A detailed preventive maintenance program should be established to ensure that the original efficiency and picture quality is maintained throughout the life of the equipment. -
Page 19: Service
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE SERVICE The MXi contains few user-serviceable parts; the modular surface-mount design makes module replacement and/or factory repair the most efficient repair method. The service most likely to be performed by users is the replacement of the fan array. EMOVING THE RRAY The MXi fan array consists of four 4”... -
Page 20: Replacing The Entire Fan Array
NTIRE RRAY In the event of a fan failure, LARCAN recommends replacing the entire array, as all fans have a similar lifespan. 1. Remove the fan array as described in Section 5.1. 2. Slide the new fan array into the MXi. The power connection is aligned so that it connects when the mounting plate is fully in place. -
Page 21: Test Equipment Setup
MXiV DUAL PALLET OPERATIONS AND MAINTENANCE TEST EQUIPMENT SETUP Figure 14 Test Equipment Setup TSM21Q-365 Rev 0 July 17, 2009 MXiV Dual Pallet Operations and Maintenance... -
Page 22: Specifications
MXi DUAL PALLET OPERATIONS AND MAINTENANCE SPECIFICATIONS Specifications are subject to change without notice. LECTRICAL AC Line Input ........................90 to 264VAC, 50 to 60Hz Power Consumption, black picture + 10% aural ................. 500VA (typical) NVIRONMENTAL Ambient Temperature .....................0°C to +45°C (0°F to 113°F) Humidity .............................. - Page 23 MXi AMPLIFIER CHASSIS CONTENTS MXi AMPLIFIER................................24 FIGURES 15 F ..........................24 IGURE RONT IEW OF MPLIFIER 16 R ..........................24 IGURE IEW OF MPLIFIER 17MX ...............................25 IGURE RRAY 18 MX ............................25 IGURE I HEATSINK SSEMBLY TSM21Q-365 Rev 0 July 17, 2009 MXi Dual Pallet Amplifier Chassis...
- Page 24 DC power supply for powering the amplifier, the controller and the cooling fans is also housed in this enclosure. Figure 15 is a front view of the MXi101V amplifier, showing the LCD Touchpad, ON/OFF switch, Status PWR (Green) and FAULT (Red) LEDs, and RESET switch.
- Page 25 MXi AMPLIFIER CHASSIS push air from the front panel through the heatsink and through the perforations in the rear panel. This assembly is located underneath the MXi Controller board. Figure 17 MXi Fan Array A thermal switch is mounted on the heatsink where the operating temperature is sensed. If this temperature increases beyond the trip point of the thermal switch, which is about 60°C, its contact opens and breaks the interlocking circuit of the MXi amplifier.
- Page 26 POWER AMPLIFIER HEATSINK ASSEMBLY CONTENTS FUNCTIONAL DESCRIPTION:...........................27 RF PREAMPLIFIER ..............................27 POWER AMPLIFIER: ..............................27 ADJUSTMENT OF BIAS VOLTAGE TO ESTABLISH PROPER QUIESCENT FET BIAS CURRENT:..28 LOW POWER SWEEP AMPLIFIERS.........................29 FIGURES 19 M IGURE ODULE WEEP ETUP ............................29 TSM21Q-365 Rev 0 July 17, 2009 June 2009...
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Page 27: Functional Description
POWER AMPLIFIER HEATSINK ASSEMBLY FUNCTIONAL DESCRIPTION: The Power Amplifier heatsink assembly consists of a preamplifier driving a four-way power splitter, four 250W FET amplifiers, a four-way power combiner. A full-size heatsink provides the cooling for the active devices. It is designed for High Band 174 - 230 MHz television systems, and provides power gain of approximately 15 - 16 dB, with 1 kW peak sync visual or 600 W aural output. -
Page 28: Adjustment Of Bias Voltage To Establish Proper Quiescent Fet Bias Current
POWER AMPLIFIER HEATSINK ASSEMBLY operating frequency band, also is equivalent to a dead short at lower frequencies where it loads the device so heavily so that the stage will not become unstable. Note that fuses are provided for the voltage supplied to the FET drain connections. The intent of these fuses is to protect the surrounding circuitry in the event of a device failure. -
Page 29: Low Power Sweep Amplifiers
POWER AMPLIFIER HEATSINK ASSEMBLY LOW POWER SWEEP AMPLIFIERS Note: Low power sweep of PA modules should not be required under normal circumstances – even when replacing FET devices. There are no tuning adjustments on these modules. 1. Ensure that terminations are in place in the test setup. All modules require 50 Ω source and load impedances to prevent damage and for consistent results during testing. - Page 30 MXi 50V 1KW POWER SUPPLY CONTENTS MXi POWER SUPPLY LAR1000-32-P5337.........................31 POWER SUPPLY DATA SHEET REPRINT ......................33 FIGURES 20 MX 1000W P ............................31 IGURE OWER UPPLY 21 12-T ..........................31 IGURE ERMINAL NTERFACE OARD TSM21Q-365 Rev 0 July 17, 2009 MXi 1kW Power Supply...
- Page 31 Figure 20 MXi 1000W Power Supply A 12-terminal interface board is used in the power supply for interfacing to various sub-assemblies in the MXi enclosure. The following describes the function of each terminal. Figure 21 12-Terminal Interface Board TSM21Q-365 Rev 0 July 17, 2009 MXi101V...
- Page 32 This enable signal comes from the MXi controller board provided the interlocks are closed and there are no fault conditions. 8. NOT USED 9. NOT USED 10. GND AC GND 11. N AC Neutral 12. PH AC Phase (Line) TSM21Q-365 Rev 0 July 17, 2009 MXi101V...
- Page 33 MXi 50V 1KW POWER SUPPLY POWER SUPPLY DATA SHEET REPRINT The following is a reprint of the LAR1000-50-P5337 switching power supply data sheet, with permission from Absopulse Electronics Ltd. TSM21Q-365 Rev 0 July 17, 2009 MXi101V...
- Page 34 MXi 50V 1KW POWER SUPPLY TSM21Q-365 Rev 0 July 17, 2009 MXi101V...