Codan 8525B Series Technical & Service Manual page 7

8525B/8528 Technical Service Manual
4.14 Options .............................................................................................................4-36
4.14.1 F-Fan Assembly..........................................................................4-36
4.14.2 LU-Switched LSB Operation......................................................4-36
4.14.3 L-Lower Sideband Operation .....................................................4-37
4.14.4 M-CW Facility............................................................................4-37
4.14.5 PH-Headphone Output ...............................................................4-37
4.14.6 R-Extended/Remote Control Interface .......................................4-37
4.14.7 AD-Antenna Driver ....................................................................4-37
5 Operating Instructions
6 Maintenance
6.1 General ...............................................................................................................6-1
6.1.1 CMOS Devices................................................................................6-1
6.1.2 Circuit Boards .................................................................................6-1
6.1.3 Transmitter Precautions...................................................................6-3
6.1.4 Probe Precautions ............................................................................6-3
6.1.5 Surface Mounted Components ........................................................6-3
6.2 Fault Diagnosis...................................................................................................6-4
6.2.1 General ............................................................................................6-4
6.2.2 Voltage Measurement......................................................................6-5
6.2.3 Front Panel Controls........................................................................6-6
6.2.4 Logic Levels ....................................................................................6-7
6.2.5 No Reception...................................................................................6-7
6.2.6 No Transmission .............................................................................6-8
6.2.7 Unlocked Synthesizer......................................................................6-8
6.2.8 Typical PA Voltages........................................................................6-8
Publication No: 15-02036
Table of Contents v
Issue 6