R&S SMB Contents – Repair
1407.0806.82 I-3.1 E-6
Contents – Chapter 3 "Repair"
3 Repair ..............................................................................................................................................3.1
Instrument Design and Function Description ...............................................................................3.1
RF Board ..................................................................................................................................3.2
Implemented functions...................................................................................................3.2
Internal and external 10 MHz reference ........................................................................3.2
TCXO 200 MHz crystal oscillator ...................................................................................3.2
RF Synthesizer/ DDS module ........................................................................................3.3
Harmonics filters ............................................................................................................3.3
LF generator ..................................................................................................................3.3
Pulse Generator and Pulse Modulator...........................................................................3.3
Modulation matrix and AM/FM/2M modulator ...............................................................3.3
Automatic Level control..................................................................................................3.4
Step Attenuator and reverse power protection ..............................................................3.4
Supply voltage control and filtering................................................................................3.4
Power Supply Module ..............................................................................................................3.4
Basis Board..............................................................................................................................3.4
Fuses .............................................................................................................................3.4
Switching regulators.......................................................................................................3.5
Controller .......................................................................................................................3.5
FPGA (SMB_COM)........................................................................................................3.5
Keyboard Controller .......................................................................................................3.5
Diagnostic ADC..............................................................................................................3.5
EEPROM .......................................................................................................................3.5
Temperature sensor.......................................................................................................3.5
Fan Controller ................................................................................................................3.5
Stereo/RDS Coder module ......................................................................................................3.6
Troubleshooting ...............................................................................................................................3.7
Measuring Equipment and Accessories...................................................................................3.7
Switch-On Problems ................................................................................................................3.8
Switch-on .......................................................................................................................3.8
Switch-off .......................................................................................................................3.9
Problems with Booting ...........................................................................................................3.12
Keyboard and Rotary Knob Test............................................................................................3.13
Troubleshooting with Internal Selftest....................................................................................3.14
Troubleshooting with Internal Adjustments............................................................................3.15
Instrument Faults ...................................................................................................................3.16
Troubleshooting – Basis Board Module .................................................................................3.21
Supply Voltages...........................................................................................................3.21
Fuses ...........................................................................................................................3.22
Troubleshooting @ RF Board Module .....................................................................................3.24
Internal Adjustment "Adjust All" ...................................................................................3.24
Supply Voltages...........................................................................................................3.24
Control Signals.............................................................................................................3.25
Input and Output Signals .............................................................................................3.27
Error Messages Concerning the RF Board Module.....................................................3.27
Warnings Concerning the RF Board Module ...............................................................3.28
Frequency Error ...........................................................................................................3.29
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