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vi Table of Contents 8525B/8528 Technical Service Manual

Issue 6 Publication No: 15-02036

6.3 Dismantling and Re-assembly............................................................................6-9

6.3.1 General ............................................................................................6-9

6.3.2 Top and Bottom Covers ..................................................................6-9

6.3.3 Circuit Board Removal....................................................................6-9

6.3.4 PA and Filter Assembly ................................................................6-10

6.3.5 Replacement of PA Transistors.....................................................6-11

6.3.6 Replacement of Escutcheon or Switch Substrate..........................6-12

7 Adjustments

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

7.2 Channel Addition (EPROM Replacement)........................................................7-1

7.2.1 Channel Addition, Programming P Channels (8528)......................7-2

7.3 Preset Adjustments.............................................................................................7-5

7.3.1 Test Equipment Required................................................................7-5

7.3.2 Voltage Regulators..........................................................................7-6

7.3.3 Crystal Oven....................................................................................7-6

7.3.4 VCO Adjustments (RF Mixer and Dual Synthesizer PCB) ............7-6

7.3.5 45MHz IF Alignment—Receive .....................................................7-7

7.3.6 1650kHz IF Alignment....................................................................7-7

7.3.7 45MHz IF Alignment—Transmit....................................................7-7

7.3.8 Highpass Filters...............................................................................7-9

7.3.9 Noise Limiter.................................................................................7-10

7.3.10 Frequency Adjustment (USB).......................................................7-10

7.3.11 Frequency Adjustment (LSB)........................................................7-10

7.3.12 Mute Adjustments .........................................................................7-11

7.3.13 PA Adjustments.............................................................................7-11

7.3.14 Output Power.................................................................................7-11

7.3.15 Options SD, SDE and SDEM........................................................7-13

7.3.16 Option TD .....................................................................................7-13

Codan 8525B Series Technical & Service Manual

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