Model 8640B
TM 9-4935-601-14-7&P
Table 5-2. Post-Repair Test and Adjustments (1 of 4)
Assembly Repaired
Performance Tests
Adjustments
A1 Output Level Assy
Harmonics Test (4-17)
Check power supply voltages
Output Level Accuracy Test
(5-25)
(4-23 or 4-24)
Output Level Knob Adjust-
Output Level Flatness Test
ment (5-30)
(4-25)
Output Level Vernier and
Output Impedance Tests
Meter Adjustment (5-31)
(4-26 and 4-27)
Output Leakage Test (4-29)
A2 Meter Switch/Detector
Output Level Accuracy Test
Check power supply voltages
Assy
(upper 2 ranges only)
(5-25)
A4 Meter/Annunciator Drive
(4-24 or 4-25)
Meter Adjustments (5-28)
Assy
AM Sensitivity and Accuracy
Panel Meter M1
Test (meter only) (4-34)
FM Sensitivity and Accuracy
Test (meter only) (4-40)
A3 RF Oscillator Assy
Frequency Range Test
Check power supply voltages
(256-512 MHz only)
(5-25)
(4-11)
V
T
Pot Adjustment (5-35)
Frequency Accuracy and Fine
V
T
Voltage Adjustment
Tune Test (fine tune only)
(5-36)
(4-12)
Preliminary FM Adjustments
Frequency Stability Tests
(if necessary) (5-38)
(4-13, 4-14, 4-15, and
4-16)
FM Linearity Adjustment
(if necessary) (5-39) (5-44)
Harmonics Test (4-17)
FM Sensitivity Adjustment
Single Sideband Phase Noise
(if necessary) (5-40)
Test (4-19)
RF Oscillator End Stop
Residual FM Test (4-22)
Adjustment (if necessary)
Output Level Flatness Test
(5-42)
(256-512 MHz only)
RF Oscillator Output Power
(4-25)
Adjustment (if necessary)
Output Leakage Test (4-29)
(5-43)
FM Distortion Test (4-39)
FM Sensitivity and Accuracy
Test (4-40)
Phase Lock Restabilization
Time Test (check only that
phase lock operates) (4-45)
5-4
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