402 E8257D/67D, E8663D PSG Signal Generators Service Guide
Post–Repair Procedures
Post–Repair Procedures Matrix
Post–Repair Procedures Matrix
Table 4-1 Post Repair Adjustments: Assemblies A1—A12 (For Prefixes < xx4928)
Adjustments Replaced Assembly
The following adjustments are listed in the order that they
should be performed for proper calibration.
A1 Keyboard
A2 Display
A2DS1 Display Backlight
A3 Power Switch
A4 Inverter
A5 Sampler
A6 Frac-N
A7 Reference (Standard)
A7 Reference (Option UNR/UNX)
A8 Output (Analog)
A8 Output (Digital)
A9 YIG Driver
A10 ALC
A11 Pulse/Analog Mod Gen
A12 Low Band Fast Pulse
ADC Calibration X X X X X X X X X X
YIG–Driver Pre–Tune Calibration X
VCO Bias Frac–N Calibration X
Internal Source Calibration X
AM Audio Path Offset Calibration X X
KV vs. Frequency Calibration X
Timebase Calibration (instruments with serial prefixes
<US4805/MY4805 and non UNR/UNX and/or UNJ Options)
X
FM Scale Offset Calibration X X X
FM Path Offset Calibration X X X
FM In–band Offset Calibration X X X
FM Inverting Amplifier Offset Calibration X
FM 1/2 Path Ratio Gain Calibration XXX
Mod Source Relative Gain Calibration X X X
FM/PM Out–of–Band Calibration XXX
FM/PM YO Frequency Compensation Calibration X X X
DC FM Calibration XXX
Low Frequency Output Calibration X
External Input Peak Detector Calibration X
Target IQ Power Calibration X
1/f Corner Calibration X
IQ Time Skew RF X
IQ Time Skew Baseband X
ALC Dynamic Calibration X X X X
Lowband Digital Prelevel Gain Calibration X
VBLO Mixer Bias Calibration X
LB Digital Gain Calibration X
Gain Adjustment Bypass Calibration (Frequencies ≤3.2 GHz) X X X X
Low Band Power Flatness Calibration X X X X
High Band Power Flatness Calibration X X X X
High Band IQ Power Floor Calibration X
Low Band IQ Power Floor Calibration
ALC Modulator Calibration X X X
High Band ALC Modulator Calibration X
Low Band ALC Modulator Calibration X
ALC Mod Bias DAC Sensitivity Calibration X X
AM Gain Calibration X X X X
IQ Impairment Calibration X
Power Clamp X
Pulse Width Calibration X X X X
9V PTAT Abus Calibration X
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