Related Manuals for Larcan MXi005U
Summary of Contents for Larcan MXi005U
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Page 1: Technical Service Manual
MXi005U 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 PUB06-76 Rev 2 July 18, 2007... - Page 2 MXi005U OPERATIONS AND MAINTENANCE CONTENTS MXi005U AMPLIFIER..............................1 MXi CONTROLLER ................................2 MXi005U C .................2 ONTROL OARD SSEMBLY AND UMPER SETTINGS MXi005U F ON/OFF B ..............4 EMOTE ONTROLS AND THE RONT ANEL UTTON ......................4 XTERNAL EMOTE ONTROL ONNECTIONS 2.3.1 Remote Command Inputs .............................4 2.3.2...
- Page 3 MXi005U OPERATIONS AND MAINTENANCE .............................13 IGURE QUIPMENT ETUP 9 MX 005U C ......................15 IGURE ONTROLLER OARD SSEMBLY PUB06-76 Rev 2 July 18, 2007 06-76-ii MXi005U Operations and Maintenance...
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Page 4: Mxi005U Amplifier
MXi005U OPERATIONS AND MAINTENANCE 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 shows the layout of this assembly. Figure 1 MXi005U Amplifier Heatsink Assembly Also mounted on the heatsink is a thermal switch that protects the amplifier from over temperature conditions. -
Page 5: Mxi Controller
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. -
Page 6: Pub06-76 Rev 2 July
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 Not installed in this assembly... -
Page 7: Pub06-76 Rev 2 July
Gentner if such systems are installed or available at the transmitter site. These external controls function in parallel with the serial remote commands implemented with the Larcan supplied remote control program. These remote signals are available on the 15-pin D-connector labeled Telemetry on the rear panel of the MXi005U transmitter. -
Page 8: Remote Telemetry Outputs
MXi005U OPERATIONS AND MAINTENANCE Figure 4 Remote Command Inputs 2.3.2 Remote Telemetry Outputs There are only four remote telemetries available to the operator, these being RF forward power, RF reflected power, AGC voltage and Cutback voltage. In the table of remote signals, all remote commands have a RT_ prefix. -
Page 9: External1 Interlock
MXi005U OPERATIONS AND MAINTENANCE can be connected to maximum 30 VDC output. The active (true) condition whether high or low will depend on the specific status output. Figure 6 Remote Status Outputs 2.3.4 External1 Interlock There is a pair of terminals on the D-connector that is used for an external interlock to interface to any site alarms or shutdown conditions. - Page 10 MXi005U OPERATIONS AND MAINTENANCE The external1 interlock contacts are available in two separate locations. The first location is on the two pin terminal block on the rear of the MXi transmitter chassis. This is the more likely and convenient place for the External1 interlock to be connected.
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Page 11: Unit,
MXi005U 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 12 MXi005U OPERATIONS AND MAINTENANCE EFORE URNING THE MPLIFIER Check that all of the following conditions are met: 1. Modulator is Ready. • Usually in the application of AC, the Modulator goes through its warm-up sequence. Ensure that it has done so.
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Page 13: Test And Troubleshooting
MXi005U OPERATIONS AND MAINTENANCE TEST AND TROUBLESHOOTING ENCH ROCEDURES The following procedures are test instructions for the amplifier modules comprising the MXi amplifier. 4.1.1 Front-End Module Bench Test Procedure • Connect a +28V (1A current limit) power supply to TP2. -
Page 14: No Rf Output
MXi005U OPERATIONS AND MAINTENANCE • Apply +28V to the B+ terminal. Monitor the current and adjust R12 counter clockwise (CCW) for a total current of about 0.6A + 0.05A. • Proceed to the next step if a network analyzer or similar equipment is available. -
Page 15: Maintenance
MXi005U 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 16 MXi005U OPERATIONS AND MAINTENANCE TEST EQUIPMENT SETUP Figure 8 Test Equipment Setup PUB06-76 Rev 2 July 18, 2007 06-76-13 MXi005U Operations and Maintenance...
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Page 17: Specifications
MXi005U OPERATIONS AND MAINTENANCE PECIFICATIONS Specifications are subject to change without notice. 7.1 E LECTRICAL AC Line Input ........................90 to 264VAC, 50 to 60Hz Power Consumption, black picture + 10% aural ................. 120VA (typical) 7.2 E NVIRONMENTAL Ambient Temperature .....................0°C to +45°C (0°F to 113°F) Humidity ................................ -
Page 18: A Ssembly
MXi005U OPERATIONS AND MAINTENANCE Figure 9 MXi005U Controller Board Assembly PUB06-76 Rev 2 July 18, 2007 06-76-15 MXi005U Operations and Maintenance... - Page 19 MXi005U OPERATIONS AND MAINTENANCE NOTES PUB06-76 Rev 2 July 18, 2007 MXi005U Operations and Maintenance...
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