Comnet MLS II MLSH041, Руководство по обслуживанию

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TABLE OF CONTENTS LBI-38425A
3
TABLE OF CONTENTS
Page
1 Description................................................................................................................................................ 4
2 Initial Adjustment .................................................................................................................................... 4
2.1 Transmitter Adjustment ................................................................................................................... 4
2.2 Receiver Adjustment........................................................................................................................ 4
2.3 Re-Installation.................................................................................................................................. 4
3 Maintenance ............................................................................................................................................. 5
3.1 Preventive Maintenance ................................................................................................................... 5
3.1.1
Connections ....................................................................................................................... 5
3.1.2 Electrical System ............................................................................................................... 5
3.1.3 Mechanical Inspection ....................................................................................................... 5
3.1.4 Antenna.............................................................................................................................. 5
3.1.5 Alignment .......................................................................................................................... 5
3.1.6 Frequency Check ............................................................................................................... 5
3.1.7 Disassembly....................................................................................................................... 6
3.2 Driver Replacement ......................................................................................................................... 6
3.2.1
To Remove Driver HC1..................................................................................................... 6
3.2.2 To Replace Driver HC1 ..................................................................................................... 6
3.3 PA Transistor Replacement.............................................................................................................. 6
3.4 Chip Component Replacement......................................................................................................... 8
3.4.1
To Remove Chip Components........................................................................................... 8
3.4.2 To Replace Chip Components ........................................................................................... 8
4 Disassembly Procedure............................................................................................................................ 9
4.1 To Remove the System Control/Synthesizer Board ......................................................................... 9
4.2 To Remove the Transmitter/Receiver Board.................................................................................... 9
4.3 To Remove the Front Panel/Control Unit ........................................................................................ 10
5 Alignment and Troubleshooting Procedures ......................................................................................... 12
5.1 Synthesizer ....................................................................................................................................... 12
5.1.1
Test Equipment Required .................................................................................................. 12
5.1.2 TX VCO & RX VCO Alignment....................................................................................... 13
5.1.3 Transmitter Frequency Adjustment.................................................................................... 14
5.1.4 Receiver Frequency Adjustment ........................................................................................ 15
5.1.5 Modulation Level Adjustment ........................................................................................... 15
5.1.6 Audio Check ...................................................................................................................... 15
5.1.7 Audio Output Level Adjustment Procedure....................................................................... 16
5.1.8 Control Logic Troubleshooting ......................................................................................... 17
5.2 Transmitter....................................................................................................................................... 18
5.2.1
General Description of Adjustment ................................................................................... 18
5.2.2 Measuring Instruments....................................................................................................... 18
5.2.3 Transmitter Adjustment Procedure .................................................................................... 20
5.3 Receiver ........................................................................................................................................... 23
5.3.1
Receiver Alignment ........................................................................................................... 23
5.3.2 Alignment Procedure ......................................................................................................... 24
5.3.3 Fixed Squelch Adjustment ................................................................................................. 25
5.3.4 Receiver Test Procedures .................................................................................................. 25