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MXi005U OPERATIONS AND MAINTENANCE

NOTES

PUB06-76 Rev 2 July 18, 2007

MXi005U Operations and Maintenance

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Summary of Contents for MXi005U

Page 1: ...Xi005U 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: ... 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 SE...

Page 3: ...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 ...

Page 4: ...es 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 PUB06 76 Rev 2 July 18 2007 06 76 1 MXi005U Operations and Maintenance ...

Page 5: ...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 jumpe...

Page 6: ...sed 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 chan...

Page 7: ...sted ON OFF state from the remote control and will cause the transmitter to enter into that state If the operator last issued a remote OFF command then the remote state of the transmitter would be OFF and if the operator last issued an ON command then the remote state of the transmitter would be OFF This is done to insure that when remote control is enabled and an AC power failure occurs then upon...

Page 8: ... Remote Status Outputs There are only two remote statuses available to the operator these being transmitter ON and an Error status In the table of remote signals all remote status have a RS_ prefix The transmitter ON status is a relay contact that with one side of the contact connected to ground When the transmitter is in the ON state this relay closes providing a path to ground to the RS_TXON sig...

Page 9: ...orward Power Spare Unused 6 RT_CutBack 7 Telemetry Cutback Voltage 1 2 Scale Ext1 8 External Interlock Normally Open RC_TXOFF 9 Control Transmitter OFF Spare Unused 10 RS_TXErr 11 Status Transmitter Error Ground Reference 12 Ground Reference RT_RflPwr 13 Telemetry Reflected Power RT_AGC 14 Telemetry AGC Voltage 1 2 Scale Ext1 15 External Interlock 12V Armed EXTERNAL TRANSMITTER INTERLOCK The MXi t...

Page 10: ...connector on the rear of the MXi transmitter chassis Only one set of these contacts need to be closed to enable the transmitter since they are in parallel These pins would expect a dry contact that is closed when there is no error condition This External 1 interlock is in parallel with the two pin terminal block on the rear of the MXi transmitter chassis The MXi applied its own 12V to one side of ...

Page 11: ...ute power levels and losses and for use as an RF sample for monitoring purposes An RF sample test point is provided below the RF out on the rear panel Its coupling is approximately 24dB and it is not calibrated for exact measurements 2 Interlocks Interlocks are employed by the amplifier to avoid damage to the equipment and to the output section For instance an internal interlock for over temperatu...

Page 12: ...ng should be about 28V and the power supply status indicator should be green ALLOW THE AMPLIFIER SOME WARM UP TIME Only after the transmitter has been ON for approximately 15 minutes should you perform fine adjustments The amplifier must be allowed to reach its operating temperature for stable and consistent operation The Power Amplifier in the MXi transmitter is equipped with thermal compensation...

Page 13: ...0 and CR100 measures between 3 5 and 5 5 volts Adjust RV110 to raise total current draw to 600 50mA Check that the junction of R110 and CR110 measures between 3 5 and 5 5 volts Increase the power supply current limiting to 2 2A Increase RV3 clockwise slowly and check that the maximum current limits itself at 1 6 0 1 Amp but do not allow current to go above 2A while performing this test Reset RV3 t...

Page 14: ...describes some fault conditions and possible solutions Amplifier Completely OFF The MXi amplifier is equipped with a fused AC line filter Although it rarely happens abnormal conditions such as power surges may cause the fuse to blow Blown AC fuses will completely shutdown the amplifier In this case replacing the fuse will rectify the problem No RF Output Check for proper power supply voltage Check...

Page 15: ...lity for later analysis An unattended site where equipment is operated by remote control and monitored by telemetry and a high quality off air receiver or demodulator can also be continuously checked for performance by studio technical personnel MONTHLY In addition to the normal operational tests thorough physical inspection of every piece of equipment should be made with all power turned off All ...

Page 16: ...MXi005U OPERATIONS AND MAINTENANCE 6 TEST EQUIPMENT SETUP Figure 8 Test Equipment Setup PUB06 76 Rev 2 July 18 2007 06 76 13 MXi005U Operations and Maintenance ...

Page 17: ...AC 50 to 60Hz Power Consumption black picture 10 aural 120VA typical NVIRONMENTAL Ambient Temperature 0 C to 45 C 0 F to 113 F Humidity 95 Altitude 3500m OOLING 1 muffin fan pulls air through the front panel and heatsink and out through the rear panel IMENSIONS The Amplifier and Modulator chassis are standard 19 rack wide units Height Amplifier 3 5 2RU Modulator 1 75 1RU Total Height 5 25 3RU HIPP...

Page 18: ...MXi005U OPERATIONS AND MAINTENANCE PUB06 76 Rev 2 July 18 2007 06 76 15 MXi005U Operations and Maintenance Figure 9 MXi005U Controller Board Assembly ...

Page 19: ...MXi005U OPERATIONS AND MAINTENANCE NOTES PUB06 76 Rev 2 July 18 2007 MXi005U Operations and Maintenance ...

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