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14-3
Block Diagram Theory of Operation
Technical Discussion
Technical Discussion
The HP/Agilent 8922 can be divided into two instruments, a signal generator and a signal
analyzer. This discussion is intended to follow the block diagrams in chapter 13. The
assemblies in Block Diagrams 1 and 2 are covered first. These are the primary assemblies
where it is possible to do assembly level measurement and troubleshooting. All the
hardware in Block Diagrams 1 and 2 are common to all HP/Agilent 8922 instruments.
Block Diagrams 3 and 4 illustrate hardware that is unique to the HP/Agilent 8922B and
HP/Agilent 8922E/F/G/H respectively. Because these modules are primarily digital, the
discussion on this hardware is limited to a high level functional description. Often
troubleshooting these boards is difficult at the module level without sophisticated logic or
signature analysis. Module swap is the fastest way to troubleshoot hardware problems for
these assemblies. The final discussion focuses on the modules in Block Diagram 5. More
information about troubleshooting display and controller problems is also included in
chapter 5.
When important, the input and output specifications for most assemblies are tabulated in
chapter 12, Module I/O Specs. For additional details on the exact signal levels and
frequencies for assembly inputs and outputs, refer to chapter 12, Module I/O Specs.
- Assembly Level Repair 1
- HP/Agilent Technologies 1
- 8922 Series GSM Test Set 1
- Contents 10
- Localizing the Problem 11
- Introduction 12
- Power-Up Checks 14
- If Power-Up Checks FAILED 15
- Where to Go Next 21
- Running Diagnostics 27
- Loading the RAM Test 33
- Verifying Performance 35
- HP/Agilent 8922F/H or M/S 37
- To Run the Program 38
- Notes on Running the Program 38
- Configuring the RF Extender 41
- Configuring the RF Extender 42
- Extending Modules 43
- Making Measurements 44
- Parallel Bus 49
- Serial Bus 50
- Keyboard 52
- Power Cord Verification 57
- Power Cord Verification 58
- Transformer / Power Switch 60
- Where To Go Next 62
- Adjustments and Calibration 63
- Timebase Adjustments 65
- Periodic Calibrations 67
- Sum Loop Adjustment Procedure 68
- Second Adjustment 69
- Final Adjustment 69
- Final Check 69
- Top and Bottom Cover Removal 73
- Inside Protective Covers 74
- A1 Front Panel Removal 77
- Tools Required 79
- A11 Receiver Mixer Removal 80
- A12 Pulse Attenuator Removal 82
- A21 GPIB Interface Removal 84
- A22 Display Removal 86
- A23 Input Section Removal 88
- A24 Attenuator Removal 89
- A28 Power Supply Removal 90
- Fan Removal 92
- Transformer Removal 94
- Replacing a Part 100
- Replaceable Parts 100
- Firmware Upgrades 123
- Service Screen 125
- Self-Test Error Messages 129
- Module I/O Specifications 131
- A2 Audio Analyzer 2 133
- Module I/O Specifications 134
- A3 Audio Analyzer 1 135
- A4 Modulation Distribution 138
- Power Supplies 140
- Serial I/O 142
- A6 Signaling Source/Analyzer 143
- A9 Global Test and Demod 145
- A11 Receiver Mixer 149
- A13 Output 152
- A14 Pulse Driver 154
- A15 Reference 156
- Hop Control 157
- A16 Receiver 162
- A18 Spectrum Analyzer 166
- A19 Measurement 168
- A25 Sum Loop 180
- A17, A26 Step Loop 183
- A27 DAC/Upconverter 186
- A28 Power Supply 188
- A33 Hop Controller 189
- Instrument Block Diagrams 193
- Block Diagram 3 195
- Block Diagram 4 195
- Block Diagram 5 195
- Technical Discussion 199
- Block Diagram 1 200
- A17 StepLoop B 201
- A18 Spectrum Aanalyzer 203
- Block Diagram 2 205
- A26 Step Loop A 207
- A12 Pulse Attenuator 209
- A23 Input 209
- A24 High Power Attenutor 209
- HP/Agilent 8922B Only 211
- A37 Sequence Controller 212
- Diagnostics Theory 215
- AF_DIAGS 217
- Audio Analyzer 2 218
- RF_DIAGS 219
- RF Generator Step Loop 220
- Sum Loop 220
- Output Section 220
- Pulse Attenuator and Drive 221
- Input Section 221
- RF Analyzer Step Loop 222
- Spectrum Analyzer 223
- Receiver 223
- MS_DIAGS 225
- GSM and DCS Diagnostic Tests 226
- Interpreting Results 227
- Measurement Theory 229
- GSM Theory 235
- The GSM System 237
- Numerics 239
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