Agilent Technologies E4438C Guía de instalación Pagina 67
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Troubleshooting
Troubleshooting Assembly Level Problems
1-55
1400 Power Supply
• If the supply voltages are good on the connector pins indicated:
a. Turn power off to the signal generator.
b. Remove the A11 Internal Bit Error Rate Analyzer (Option UN7) and ohm the connection between the
appropriate pins of J14/J4, and sockets J14/J4.
— If the connection is good, replace the A11 Internal Bit Error Rate Analyzer (Option UN7).
(Refer to “A11 Internal Bit Error Rate Analyzer (Option UN7)” on page 2-28.)
— If the connection is bad, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
• If the supply voltages are bad on the connector pins indicated:
a. Check the origin of the supply.
— If the supply voltage is good at the origin, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the supply voltage is bad at the origin, troubleshoot the problem using that assembly's
troubleshooting procedure.
- 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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