Agilent Technologies E4438C Guia de Instalação Página 153
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Troubleshooting
Block Descriptions for Option UNJ and Option 506
1-141
The RPP circuitry prevents instrument damage when power is mistakenly applied to the instrument’s RF
output. The RPP circuitry opens an RF relay when 1 Watt of energy is sensed on the RF output. Repeated
high levels of reverse power degrade the performance of the RPP or completely bypass the open RF relay. The
RPP may be reset through the front panel softkeys.
There is no RPP module available for Option 506, which covers the frequency range of 4 GHz to 6 GHz.
Instead, an A29 DC Blocking Capacitor (Option 506) is used to block dc from damaging the AT1 High-Power
Mechanical Attenuator (Option UNB).
- Service Guide 1
- Contents 10
- 1 Troubleshooting 13
- Before Troubleshooting 14
- Troubleshooting Aids 15
- Table 1-2 16
- ILT-2 A12 CPU Power-On Test 17
- Table 1-3 18
- Table 1-4 23
- Table 1-5 23
- Table 1-6 24
- Table 1-7 24
- Table 1-8 26
- Overview 31
- To Run Self-Test 32
- Power Supplies 35
- Table 1-12 36
- Table 1-13 37
- Table 1-14 38
- Table 1-15 39
- Table 1-16 40
- Table 1-17 42
- AC and Switch 43
- Table 1-18 44
- Table 1-19 47
- Table 1-20 51
- Table 1-21 54
- Table 1-22 57
- Table 1-23 59
- Table 1-24 60
- Table 1-25 62
- Table 1-26 64
- Table 1-27 66
- Self-Tests 15xx 68
- Table 1-29 70
- Table 1-30 74
- Table 1-31 78
- Troubleshooting Unlocks 80
- 512 Reference Unlocked 81
- 513 1 GHz Out of Lock 81
- 516 Baseband Generator Unlock 83
- 623 Demod Unlock 84
- Table 1-33 86
- Table 1-34 87
- Troubleshooting the 91
- Calibration • A18 Reference 97
- Troubleshooting 103
- Relative to CW • Perform: 106
- Peak Search and Marker Delta 113
- Table 1-41 116
- Table 1-42 118
- Pulse menu 119
- No Pulse Signal from LF Out 124
- Review the Warranty 125
- Table 1-43 Contacting Agilent 126
- Asia Call Center Numbers 126
- Alternate Amplitude 135
- Analog Modulation 137
- Reference / Synthesis Loop 159
- A17 Synthesizer 160
- A23 Motherboard 160
- A13 Output 161
- 4 GHz Modulator - IQ 163
- To A13 Output 163
- 4 GHz Mod Offset Sense - IQ 163
- From A13 Output 163
- Option 506 Only 164
- A16 Frac-N 165
- A22 Coupler (Option 506) 166
- 2 Assembly Replacement 171
- After Replacing an Assembly 172
- Tools Required 174
- Removal Procedures 174
- Replacement Procedure 174
- Assembly Replacement 175
- Front Panel 176
- A1 Keyboard 178
- Figure 2-4 A1 Keyboard 179
- A2 Display 180
- Figure 2-5 A2 Display 181
- A2DS1 Display Backlight 182
- Figure 2-6 A2DS1 Backlight 183
- A3 Front Panel Auxilary Board 184
- A4 Inverter 186
- Figure 2-8 A4 Inverter 187
- Removal Procedure 188
- A6 Power Supply 190
- Figure 2-10 A6 Power Supply 191
- A10 I/Q Multiplexer 196
- Figure 2-16 A13 Output 203
- A18 Reference 212
- Figure 2-21 A18 Reference 213
- A19 Daughterboard 214
- Figure 2-26 A23 Motherboard 224
- A23BT1 Battery 225
- A24 Line Module 226
- Rear Panel 227
- Figure 2-29 Rear Panel 228
- A25 Rear Panel Board 229
- Option UNJ) 233
- B1 Power Supply Fan 241
- B2 Small Fan 243
- Figure 2-38 B2 Small Fan 244
- RF Output Connector 247
- 3 Replaceable Parts 251
- Ordering Information 252
- Replaceable Parts 253
- Assemblies from a Top View 258
- Assemblies of the Front Panel 264
- Table 3-2 265
- Table 3-4 269
- Table 3-5 271
- Table 3-6 274
- Table 3-7 276
- Table 3-8 278
- Table 3-9 280
- Table 3-10 282
- Table 3-11 285
- Option UNJ - Overall Cables 287
- Table 3-12 288
- Table 3-13 290
- Option UNJ - Standard Cables 292
- Table 3-15 294
- Table 3-16 296
- Table 3-17 299
- Table 3-18 302
- Option 506 - Overall Cables 305
- Table 3-19 306
- Table 3-20 308
- Option 506 - Standard Cables 310
- Table 3-21 311
- Table 3-22 313
- Table 3-23 315
- Table 3-24 317
- Table 3-25 320
- Hardware of the Front Panel 323
- Table 3-27 325
- Hardware of the Rear-Panel 327
- Table 3-29 329
- (Option 1EM) 330
- Hardware of a Disassembled 331
- Table 3-33 335
- Table 3-34 336
- Table 3-35 337
- Table 3-36 339
- Miscellaneous 340
- 4 Post-Repair Procedures 343
- Post-Repair Procedures Matrix 344
- Post-Repair Procedures 345
- 5 Safety and Regulatory 353
- Safety Notes 354
- General Safety Considerations 355
- Lithium Battery Disposal 356
- Warranty 357
- Assistance 358
- Certification 360
- Index I-1 361
- I-2 Index 362
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