Table Of Contents - GE MLSH041 Maintenance Manual

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
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.2 PA TRANSISTOR REPLACEMENT .........................................................................................6
3.3 CHIP COMPONENT REPLACEMENT.....................................................................................7
3.3.1
3.3.2
4 DISASSEMBLY PROCEDURE .............................................................................................................8
4.1 TO REMOVE THE SYSTEM CONTROL/SYNTHESIZER BOARD.......................................8
4.2 TO REMOVE THE TRANSMITTER RECEIVER BOARD......................................................8
4.3 TO REMOVE THE FRONT PANEL/CONTROL UNIT............................................................8
5 ALIGNMENT AND TROUBLESHOOTING PROCEDURES...........................................................11
5.1 SYNTHESIZER...........................................................................................................................11
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
5.1.7
5.2 TRANSMITTER..........................................................................................................................16
5.2.1
5.2.2
5.2.3
5.2.4
5.3 RECEIVER ..................................................................................................................................20
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
LBI-38438A
Connections ...................................................................................................................5
Electrical System ...........................................................................................................5
Mechanical Inspection ...................................................................................................5
Antenna..........................................................................................................................5
Alignment ......................................................................................................................5
Frequency Check ...........................................................................................................5
Disassembly...................................................................................................................5
To Remove Chip Components.......................................................................................7
To Replace Chip Components .......................................................................................7
Test Equipment Required ..............................................................................................11
TX VCO & RX VCO Alignment...................................................................................12
Transmitter Frequency Adjustment ...............................................................................13
Receiver Frequency Adjustment....................................................................................13
Modulation Level Adjustment .......................................................................................13
Audio Check ..................................................................................................................14
Audio Output Level Adjustment Procedure...................................................................15
General Description of Adjustment ...............................................................................16
Measuring Instruments ..................................................................................................16
Adjustment System ........................................................................................................17
Transmitter Adjustment Procedure ................................................................................17
Receiver Alignment .......................................................................................................20
Alignment Procedure .....................................................................................................21
Fixed Squelch Adjustment.............................................................................................21
Receiver Test Procedures...............................................................................................22
Test Procedure ...............................................................................................................22

TABLE OF CONTENTS

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