E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Adjustment Problems
1-73
Attenuator Calibration–Highband and Low
Power
AT1
RF Path
AM Gain Calibration A11 Pulse Modulation Generator
Gain Adjustment Bypass Calibration
(Frequencies £ 3.2 GHz)
A8 Output
A6 Frac–N
Pulse Width Calibration A11 Pulse/Analog Modulation Generator
A30 Modulation Filter
A8 Output
IQ Impairment A13 IQ Mux
A35 3–20 GHz IQ Modulator
A8 Output
Cables between IQ Mux and IQ Modulators
9v PTAT A10 ALC
Lowband Digital Pre–level Gain Calibration A6 Frac–N
Lowband Digital Mixer Bias Calibration A8 Output
Lowband Digital Gain Adjust A8 Output
IQ Power Floor A13 IQ Mux
Target IQ Power A13 IQ Mux
I/F Corner A13 IQ Mux
A8 Output
A35 3–20 GHz IQ Modulator
A37 Upconverter
Upconverter Download A37 Upconverter
RF Timing Skew A14 Baseband Generator
A13 IQ Mux
A8 Output
A35 3–20 GHz IQ Modulator
A37 Upconverter
Baseband Generator Timing Skew A14 Baseband Generator
A13 IQ Mux
VBand Level Accuracy AT1 Attenuator
A24/25 67 GHz Coupler/Detector
Upconverter Gain Adjust Calibration A37 Upconverter
A35 3–20 GHz IQ Modulator
Modulator Bias DAC Sensitivity A10 ALC
A8 Output
A30 Modulation Filter
A36 Quadraplier
A37 Upconverter
Table 1-22 Troubleshooting Help for Failed Adjustments (Continued)
Adjustment that is failing... Assemblies most likely causing failure...
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