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X-2 Technical Service Manual iii

Publication No: 15-02047

5.3.4 Transmitter Failure .....................................................................5-7

5.3.5 Unlocked Synthesiser..................................................................5-7

5.3.6 PA Failure ..................................................................................5-8

5.4 Dismantling and Assembling............................................................................5-8

5.4.1. General.......................................................................................5-8

5.4.2 Top and Bottom Covers .............................................................5-9

5.4.3 Rx/Exciter & Control PCB .........................................................5-9

5.4.4 Front Panel PCB.........................................................................5-9

5.4.5 PA and Filter Assembly.............................................................5-10

5.4.6 Replacement of PA Transistors.................................................5-11

6 Channel Additions.........................................................................................6-1

7 Adjustments.......................................................................................................7-1

7.1 Introduction....................................................................................................7-1

7.2 Test Equipment Required................................................................................7-1

7.3 Voltage Regulators .........................................................................................7-1

7.4 Crystal Oven...................................................................................................7-2

7.5 Test Mode ......................................................................................................7-2

7.6 VCO Checks and Adjustments ........................................................................7-4

7.6.1 VCO1 Check..............................................................................7-4

7.6.2 VCO2 Check..............................................................................7-4

7.6.3 VCO2 Adjust..............................................................................7-5

7.7 45 MHz Filter Alignment.................................................................................7-5

7.7.1 Alignment - Method 1.................................................................7-6

7.7.2 Alignment - Method 2.................................................................7-7

7.8 455 kHz IF and N/L Alignment.......................................................................7-7

7.9 Frequency Adjustment.....................................................................................7-8

7.9.1 Frequency Adjust USB ...............................................................7-8

7.9.2 Frequency Adjust LSB................................................................7-9

7.10 Mute Adjustment.............................................................................................7-9

7.11 PA Adjustments.............................................................................................7-10

7.11.1 Driver Bias ...............................................................................7-10

7.11.2 PA Bias ....................................................................................7-10

7.11.3 Output Power...........................................................................7-11

7.11.4 Intermodulation........................................................................7-12

7.12 Receiver Performance Checks........................................................................7-13

7.12.1 Sensitivity and S+N/N ratio ......................................................7-13

7.12.2 AGC Check..............................................................................7-13

7.12.3 Audio Output ...........................................................................7-13

Codan X-2 User Manual

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