Table of Contents
Troubleshooting
Related Manuals for ATX Larcan MXD5U
Summary of Contents for ATX Larcan MXD5U
- Page 1 MXD5U 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 PUB09-03 Rev 0 16 April, 2009...
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Page 2: Table Of Contents
MXD5U OPERATIONS AND MAINTENANCE CONTENTS AMPLIFIER ..................................1 CONTROLLER .................................2 ....................2 ONTROL OARD SSEMBLY AND UMPER SETTINGS MXD5U F ON/OFF B ..............4 EMOTE ONTROLS AND THE RONT ANEL UTTON ......................6 XTERNAL EMOTE ONTROL ONNECTIONS 2.3.1 Remote Command Inputs .............................6 2.3.2 Remote Telemetry Outputs ...........................6 2.3.3 Remote Status Outputs ............................7 2.3.4... - Page 3 MXD5U OPERATIONS AND MAINTENANCE .............................14 IGURE QUIPMENT ETUP 9 - F , MXD5U..........................16 IGURE RONT MPLIFIER 10 - IPA A , MXD5U............................17 IGURE SSEMBLY 11 - A , MXD5U ..........................18 IGURE MPLIFIER ALLET 12 MXD5U C ........................19 IGURE ONTROL OARD SSEMBLY PUB09-03 Rev 0 April 16, 2009 09-03-ii...
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Page 4: Amplifier
MXD5U OPERATIONS AND MAINTENANCE AMPLIFIER The RF section of the MXD5U 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 MXD5U Amplifier Heatsink Assembly Also mounted on the heatsink is a thermal switch that protects the amplifier from over temperature conditions. -
Page 5: Controller
MXD5U OPERATIONS AND MAINTENANCE CONTROLLER The control board (Assembly 31C1971) is a single-circuit assembly that provides all of the control functions required for the transmitter on a single circuit board. This board can be configured for a number of different transmitter types, power levels, transmission standards and options. - Page 6 MXD5U OPERATIONS AND MAINTENANCE Not used in the MXD5U transmitter Setting = no jumper installed Not used in the MXD5U transmitter Setting = no jumper installed Not installed in this assembly Front Panel ON/OFF button Mode This jumper determines the function of the Front Panel ON/OFF button If E5 is in the ‘INT’...
- Page 7 MXD5U OPERATIONS AND MAINTENANCE Direct Vswr Relay reset from the Remote Reset Command This jumper allows the Remote Reset Command to directly clear the VSWR trip relay Setting = Installed for all MXD5U transmitters Forward Power Detection Type Setting = PK for all MXD5U transmitters 2.2 P , AGC OWER...
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Page 8: Remote Controls And The Mxd5U Front Panel On/Off Button
MXD5U OPERATIONS AND MAINTENANCE Turn OFF Amplifier. VSWR Trip With Amplifier OFF, install a short length of cable at the RF output, if one is not already there. Add an N-type Tee connector on the output of the cable. Connect a 50R load on each of the two female connections on the Tee. This results in a 10dB Return Loss for VSWR setup. -
Page 9: External Remote Control Connections
MXD5U OPERATIONS AND MAINTENANCE XTERNAL EMOTE ONTROL ONNECTIONS External remote controls are intended to interfacing to a third party remote control vendor such as Moseley or 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. -
Page 10: 2.4.3 Remote Status Outputs
MXD5U OPERATIONS AND MAINTENANCE 2.4.3 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 signal. -
Page 11: External
MXD5U OPERATIONS AND MAINTENANCE RS_TXErr Status, Transmitter Error Ground Reference Ground Reference RT_RflPwr Telemetry, Reflected Power RT_AGC Telemetry, AGC Voltage (1/2 Scale) Ext1+ External Interlock, (+12V Armed) 2.5 E XTERNAL RANSMITTER NTERLOCK The transmitter provides the customer a set of contacts where an external interlock can be applied to control the ON state of the transmitter. -
Page 12: Interlock
MXD5U OPERATIONS AND MAINTENANCE AMPLIFIER INSTALLATION AND STARTUP The transmitter can be fully operational with minimal setup when turned ON. However, a good practice is to take the “start from scratch” approach, which means that you should take precautionary measures before the amplifier is allowed to run at full rated power. -
Page 13: Amplifier On Sequence
MXD5U OPERATIONS AND MAINTENANCE 1. Modulator is Ready. • Usually in the application of AC, the Modulator goes through its warm-up sequence. Ensure that it has done so. 2. CONTROLLER is ready. • If there were prior faults (see front panel LED), clear them by pushing the RESET button. 3. -
Page 14: Test And Troubleshooting
MXD5U OPERATIONS AND MAINTENANCE TEST AND TROUBLESHOOTING ENCH ROCEDURES The following procedures are test instructions for the amplifier modules comprising the complete amplifier assembly. 4.1.1 Front-End Amplifier (Figure 9) Bench Test Procedure • Connect a +28V (1A current limit) power supply to TP2. •... -
Page 15: Basic Troubleshooting Techniques
MXD5U OPERATIONS AND MAINTENANCE • Before applying +28V to the module, adjust R12 fully clockwise. Limit the power supply current to 3.0A. • Apply +28V to the B+ terminal. Monitor the current and adjust R12 counter clockwise (CCW) for a total current of about 1.0A + 0.05A. -
Page 16: Maintenance
MXD5U 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 17: Test Equipment Setup
MXD5U OPERATIONS AND MAINTENANCE TEST EQUIPMENT SETUP Figure 8 Test Equipment Setup PUB09-03 Rev 0 April 16, 2009 09-03-14 MXD5U Operations and Maintenance... -
Page 18: Specifications
MXD5U 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 ................. 220VA (typical) NVIRONMENTAL Ambient Temperature .....................0°C to +45°C (0°F to 113°F) Humidity ................................ - Page 19 MXD5U OPERATIONS AND MAINTENANCE Figure 9 - Front End Amplifier, MXD5U PUB09-03 Rev 0 April 16, 2009 09-03-16 MXD5U Operations and Maintenance...
- Page 20 MXD5U OPERATIONS AND MAINTENANCE Figure 10 - IPA Assembly, MXD5U PUB09-03 Rev 0 April 16, 2009 09-03-17 MXD5U Operations and Maintenance...
- Page 21 MXD5U OPERATIONS AND MAINTENANCE Figure 11 - Amplifier Pallet, MXD5U PUB09-03 Rev 0 April 16, 2009 09-03-18 MXD5U Operations and Maintenance...
- Page 22 MXD5U OPERATIONS AND MAINTENANCE Figure 12 MXD5U Control Board Assembly PUB09-03 Rev 0 16 April, 2009 09-13-19 MXD5U Operations and Maintenance...
- Page 23 MXD5U OPERATIONS AND MAINTENANCE NOTES PUB09-03 Rev 0 16 April, 2009 MXD5U Operations and Maintenance...
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