Rohde & Schwarz SMU200A - Contents - Chapter 3 Repair

R&S SMU200A Contents – Repair
1007.9845.82 I-3.1 E-6
Contents – Chapter 3 "Repair"
3 Repair ................................................................................................................... 3.1
Instrument Design and Function Description ...............................................................................3.1
RF-Section ...............................................................................................................................3.1
Standard Synthesis Module SSYN ................................................................................3.1
Synthesis Extension Module SYNEX ............................................................................3.3
IQ Output Module 3GHz IQOP3 ....................................................................................3.4
IQ Output Module 6GHz IQOP6 ....................................................................................3.6
Attenuators 3 GHz SATT3 and 6 GHz SATT6 ..............................................................3.7
High-Power Output (Option for SATT3 and SATT6) .....................................................3.7
Overvoltage Protection (Option for SATT3)...................................................................3.8
Electronic Attenuator 6 GHz SATT6C ...........................................................................3.8
Baseband Section ....................................................................................................................3.8
Data Transfer .................................................................................................................3.8
IQ Bridge ........................................................................................................................3.8
DAC Interface DACIF.....................................................................................................3.9
DAC Board...................................................................................................................3.10
Baseband Input............................................................................................................3.10
Universal Coder UNICOD ............................................................................................3.11
Fading Simulator (FADER) and Fading Simulator Extension (FADEX) ......................3.12
Power Supply Module ............................................................................................................3.13
Front Module Controller .........................................................................................................3.13
Motherboard ...........................................................................................................................3.13
Troubleshooting .............................................................................................................................3.14
Measuring Equipment and Accessories.................................................................................3.14
Switch-On Problems ..............................................................................................................3.15
Problems with Booting ...........................................................................................................3.18
Keyboard and Rotary Knob Test............................................................................................3.22
A Baseband Module can not be operated..............................................................................3.23
Troubleshooting with Test Points and Debug Page...............................................................3.23
Troubleshooting with Internal Adjustments............................................................................3.24
Faulty RF Output Signal.........................................................................................................3.26
Level Errors..................................................................................................................3.27
Faulty I/Q Modulation .............................................................................................................3.28
Faulty AM ...............................................................................................................................3.29
Faulty Pulse Modulation.........................................................................................................3.30
Faulty Signal Generation in the Baseband ............................................................................3.31
Troubleshooting - Module SSYN ...........................................................................................3.33
Internal adjustment “Adjust Synthesis” ........................................................................3.33
Input and Output Signals .............................................................................................3.33
Error messages concerning the module SSYN ...........................................................3.34
Error Message - DACIF: PLL unlocked (100 MHz) .....................................................3.35
Frequency Error < 2*10
-6
, Reference Oscillator adjustment ........................................3.35
Troubleshooting - Module SYNEX .........................................................................................3.36
Internal adjustment “Adjust Synthesis” ........................................................................3.36
Input and Output Signals .............................................................................................3.36
Error messages concerning the module SYNEX.........................................................3.36
Error Message - DACIF: PLL unlocked (100 MHz) .....................................................3.37
Frequency Error < 2*10
-6
, Reference Oscillator adjustment ........................................3.37