GE MLSH041 - Table of Contents

TABLE OF CONTENTS
LBI-38438A 3
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...................................................................................................................5
3.2 PA TRANSISTOR REPLACEMENT.........................................................................................6
3.3 CHIP COMPONENT REPLACEMENT.....................................................................................7
3.3.1 To Remove Chip Components.......................................................................................7
3.3.2 To Replace Chip Components .......................................................................................7
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 Test Equipment Required ..............................................................................................11
5.1.2 TX VCO & RX VCO Alignment...................................................................................12
5.1.3 Transmitter Frequency Adjustment ...............................................................................13
5.1.4 Receiver Frequency Adjustment....................................................................................13
5.1.5 Modulation Level Adjustment.......................................................................................13
5.1.6 Audio Check..................................................................................................................14
5.1.7 Audio Output Level Adjustment Procedure...................................................................15
5.2 TRANSMITTER..........................................................................................................................16
5.2.1 General Description of Adjustment ...............................................................................16
5.2.2 Measuring Instruments ..................................................................................................16
5.2.3 Adjustment System........................................................................................................17
5.2.4 Transmitter Adjustment Procedure................................................................................17
5.3 RECEIVER..................................................................................................................................20
5.3.1 Receiver Alignment.......................................................................................................20
5.3.2 Alignment Procedure.....................................................................................................21
5.3.3 Fixed Squelch Adjustment.............................................................................................21
5.3.4 Receiver Test Procedures...............................................................................................22
5.3.5 Test Procedure...............................................................................................................22