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Troubleshooting
Troubleshooting Assembly–Level Problems
702 Tuning Voltage
1. Using an oscilloscope, check 10 MHz Synthesis line on P33–15. The signal period should be
100 ns with an amplitude of approximately 3V
pp
.
• If the signal is good, replace the A6 Frac–N.
2. If the signal is bad, turn the signal generator power off, remove the A6 Frac–N, and measure the
signal at P33–15 again.
• If the signal is good, replace the A6 Frac–N.
3. If the signal is still bad, measure P41–5 on the A7 Reference.
• If the signal is good, at P41–5, replace the A31 Motherboard.
• If the signal is bad on P41–5, replace the A7 Reference.
703 Output Voltage
1. Using an oscilloscope, check 10 MHz Synthesis line on P33–15. The signal period should be
100 ns with an amplitude of approximately 3V
pp
.
• If the signal is good, replace the A6 Frac–N.
2. If the signal is bad, turn the signal generator power off, remove the A6 Frac–N, and measure
P33–15 again.
• If the signal is good, replace the A6 Frac–N.
3. If the signal is still bad, measure P41–5 on the A7 Reference.
• If the signal is good at P41–5, replace the A31 Motherboard.
• If the signal is bad at P41–5, replace the A7 Reference.
- Service Guide 1
- Contents 10
- 1 Troubleshooting 11
- ESD) Information 12
- Running Self-Test 13
- A18 CPU Turn–On Test 14
- Checking the A18 CPU Voltages 15
- Error Messages 16
- P12−1 −5.2 Vdc 22
- P12−3 LIGHT_EN >3 Vdc 22
- Brightness = 1, VDSP = 3 Vdc 22
- P11−6 LCD_ENABLE_H >3 Vdc 23
- Local hardkey 25
- Power Supply Troubleshooting 27
- I/Q hardkey 46
- check in Step 2 47
- Table 1-13 53
- Pin 1 –5.2 Vdc –5.2 ±.1 Vdc 59
- Pin 17 –6 Vdc –6 ±.1 Vdc 59
- Pin 18 +9 Vdc +9 ±.1 Vdc 59
- A29 20 GHz Doubler J32 62
- A27 40 GHz Doubler J33 62
- A35 I/Q Modulator J34 62
- A30 Modulation Filter J31 62
- Troubleshooting Unlocks 74
- 515 10 MHz Signal Bad 75
- 520 Sampler Unlocked 75
- 521 YO Loop Unlocked 75
- Troubleshooting Unlevels 77
- Table 1-15 78
- Table 1-16 78
- A6 Frac-N 81
- A6 Frac-N 81
- Troubleshooting the RF Path 86
- ALC and RF problems 86
- Table 1-19 87
- Table 1-20 88
- Table 1-21 89
- 20 GHz Models 90
- 40 GHz Models Only 91
- Table 1-24 93
- Most Likely Assembly 94
- Overall Description 95
- Input/Output Interface 96
- Frequency Generation 97
- Amplitude A10 ALC 99
- Frequency and Phase A6 Frac–N 99
- Synthesis Loop 101
- A7 Reference 104
- A5 Sampler (CW mode only) 105
- A6 Frac–N 105
- A9 YIG Driver 106
- A28 YIG Oscillator (YO) 107
- A29 20 GHz Doubler 107
- Troubleshooting 108
- Loop Filter & 109
- RF Path Description 110
- A8 Output 111
- A30 Modulation Filter 112
- A25 High Band Detector 112
- ALC Loop 113
- Digital Modulation 115
- Self-Test Overview 120
- Asia Call Center Numbers 123
- 2 Assembly Replacement 126
- Outer Instrument Cover 130
- Assembly Replacement 131
- Inner Instrument Cover 132
- Front Panel 134
- Replacement Procedure 135
- A1 Keyboard 137
- A2 Display 139
- Figure 2-5 A2 Display Removal 140
- A2DS1 Display Backlight 141
- A3 Power Switch 143
- A4 Inverter 145
- UNR), and A8 Output 147
- Figure 2-10 A9 YIG Driver 150
- Tools Required 151
- Removal Procedure 151
- Figure 2-11 A10 ALC 152
- Figure 2-14 A13 I/Q MUX 158
- Figure 2-17 A18 CPU 164
- Figure 2-18 A18BT1 166
- A19 Power Supply 167
- Rear Panel (Standard) 169
- Rear Panel (Option 1EM) 172
- Figure 2-22 A20 SMI 176
- A21 Rear-Panel Interface 177
- A22 Line Module 179
- AT1 115 dB Attenuator 181
- A23 Lowband Coupler/Detector 185
- A25 20 GHz Highband Detector 191
- Figure 2-36 A26 MID 198
- A28 YIG Oscillator 201
- A31 Motherboard (E8247C/57C) 208
- A31 Motherboard (E8267C) 211
- A33 6 dB PAD 217
- Figure 2-44 A33 6 dB PAD 218
- Figure 2-47 B1 Fan 224
- 3 Replaceable Parts 226
- Ordering Information 227
- Replaceable Parts 228
- Assemblies from a Top View 235
- Assemblies from a Bottom View 241
- A18BT1 Lithium Battery 243
- Table 3-1 244
- Hardware 249
- Front Panel View 250
- Figure 3-12 Front Panel View 251
- Disassembled Front Panel View 252
- Disassembled Rear Panel View 254
- Detector Bias Board 260
- Bias Board 261
- Miscellaneous 273
- 4 Post-Repair Procedures 276
- Post-Repair Procedures Matrix 277
- FM In-band Offset Calibration 278
- Post-Repair Procedures 283
- 5 Safety and Regulatory 284
- General Safety Considerations 285
- Lithium Battery Disposal 286
- Assistance 286
- Certification 286
- Safety and Regulatory 287
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