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5-44
690XXB/691XXB MM
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
Error 130 2-3.3 GH Switched Filter
Error 131 3.3-5.5 GH Switched Filter
Error 132 5.5-8.4 GH Switched Filter
Error 133 8.4-13.25 GH Switched Filter
Error 134 13.25-20 GH Switched Filter
Description: Each of these error messages indicates a failure in a
switched filter path within the switched filter assembly. The 690XXB/
691XXB may or may not produce an RF output in the frequency range
of the failed switched filter path.
Step 1.
Set up the 690XXB/691XXB as follows:
a. 690XXB Setup:
CW/SWEEP SELECT: Step
F1: 2.000 GHz
F2: 20.000 GHz (8.4 GHz for Model 69017B)
Number of Steps: 400
691XXB Setup:
CW/SWEEP SELECT: Analog
F1: 2.000 GHz
F2: 20.000 GHz (8.4 GHz for Model 69117C)
Sweep Time: 0.100 Sec
Step 2.
Connect the X input of an oscilloscope to the 690XXB/
691XXB rear panel
HORIZ OUT
connector.
Step 3.
Using the oscilloscope, check for the switched filter PIN
switch drive voltages at the test points shown in Table 5-21.
q
If the PIN switch drive voltages are correct, replace the
switched filter assembly.
q
If the PIN switch drive voltages are incorrect, replace the
A9 PCB.
Table 5-20.
Error Messages 128, 129, 130, 131, 132, 133, 134, and 135 (7 of 8)
Test Point
Active Frequency
Range
Active
Voltage
Inactive
Voltage
A9TP18
2 to 3.3 GHz
–2.35V
+1.0V
A9TP10
3.3 to 5.5 GHz
–2.0V
+1.0V
A9TP12
5.5 to 8.4 GHz
–2.0V
+1.0V
A9TP16
8.4 to 13.25 GHz
–2.0V
+1.0V
A9TP21
13.25 to 20 GHz
–2.0V
+1.0V
A9TP17
2 to 8.4 GHz
–2.3V
+2.0V
Table 5-21.
Switched Filter PIN Switch Drive Voltages
Summary of Contents for 680 C Series
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