Agilent Technologies E4438C Guida di Installazione Pagina 161
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AT1
Electronic
Attenuator
5/10/40/20/40
AT1
High-Power
Mechanical
Attenuator
Gain
Adj.
250 MHz
to 4 GHz
Prelevel Detector Bypass
0
o
90
o
Burst/
Scan
Mod
ALC
Mod
Ext Q Mod
Ext I Mod
Offset Sense I
Offset Sense Q
Gain
Adjust
DAC
Filter
Cutoff
Latch
ALC Mod
Driver Bias
Gain DAC
Burst
Mod
Offset
DAC
Burst
MOD
Lin
DAC
Burst Mod
Driver
Bias Gain
DAC
Quad
DAC
VBLO
(LO dc
bias)
DAC
H_BYPASS
Het
Select
Latch
VCCS
VCCS
Dual Slope
Logger
ALC
REF
DAC
ALT
ALC
REF
DAC
Log
Offset
DAC
Detector
Offset
DAC
RF
Power
Detector
Modulator Control Logic
L Burst Mode
L ALC Hold
L Open Loop
L RF Burst Mod
L RF Off ALC Mod
L Hold ALC
L Alt PWR Sel
L Alt PWR
L Alt Int Off
LATCHES
L
Enable
Log
Busrt
L
Enable
Lin AM
L Open
Loop
In Band AM
In Band AM
Deep AM Hold
Lin Burst AM
Log Burst AM
L
Enable
Lin
Burst
Pulse Mod
Linear AM
Log AM
ALC Ref
ALC Ref
ALC Ref
Feed Forward AM
Pulse Mod
L Open
Loop
Feed Forward AM
ALC Mod
Offset
DAC
L Open
Loop
MOD L
BW 1
&
BW2
Pulse Mod
MOD L
BW 1
&
BW2
RF Output
BB
Thru
BB
Filtered
Marble+
Log Converter Amp
Main ALC
Alt ALC
H
AM
Hold
En
1200
MHz
850 to
1150
MHz
400
MHz
15 dB
3 dB
1 GHz
Ref
HET Band
Burst
Mod
Video
HPf
250
MHz
Low
Burst
Enable
RF
Power
Detector
Det BW
Sel
Latch
4 dB
Pads
Bulk R
Resistance
Pot
Sloped
Pad
250 MHz
to 4 GHz
Sloped
Pad
250 MHz
to 4 GHz
Pulse Mod In
AM Mod In
Aux. Out
Rear Panel
250 kHz to
4 GHz Output
Prelevel Drive
Pre
Level
Ref
DAC
A28
Reverse
Power
Protection
(RPP)
RF Path Block Diagram for Option 501, 502, 503, 504
blk_03
A13 Output
J6
P1-19
From A18 Reference
P1-19
J4
P3-4
J5
P1-6
P1-2
To A17
Synthesizer
P3-17
From A17
Synthesizer
J6
From A18
Reference
P3-7
From A18
Reference
P3-17
P3-19 P3-8
P3-6
and
P3-15
From A10
I/Q Multiplexer
J9
From A10
I/Q Multiplexer
J10
To A10
I/Q Multiplexer
P1-9
and
P1-34
- 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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