5-42 682XXB/683XXB MM
Unleveled with no/low output power:
Step 1. Set up the 682XXB/683XXB as follows:
a. 682XXB Setup:
CW/SWEEP SELECT:Step
F1: 0.010 GHz
F2: 2.000 GHz
Number of Steps: 400
L1: +1.00 dBm
683XXB Setup:
CW/SWEEP SELECT:Analog
F1: 0.010 GHz
F2: 2.000 GHz
Sweep Time: 0.100 Sec
L1: +1.00 dBm
b. LEVEL/ALC SELECT:ALC Mode
Leveling Menu: Internal
Step 2. Connect the X input of an oscilloscope to the 682XXB/
683XXB rear panel HORIZ OUT connector.
Step 3. Disconnect the cable, W114,from A10J3.
Step 4. Using the oscilloscope, check at the end of cable W114for a
>2.0 volt down converter detector output throughout the full
sweep.
If the detector voltage is correct, replace the A10 PCB.
If the detector voltage is incorrect, go to step 5.
Step 5. Using the oscilloscope, check for a +15 volt down converter
bias voltage at A13TP14.
If the bias voltage is correct, go to step 6.
If the bias voltage is not correct, replace the A13 PCB.
Step 6. Using the oscilloscope, check for a –2 volt PIN switch drive
voltage at A9TP19 and A9TP22. If the 682XXB/683XXB has
a SDM installed, also check for a +20 volt PIN switch drive
voltage at A9TP9.
If the PIN switch drive voltage(s) is correct, go to step 7.
If the PIN switch drive voltage(s) is not correct, replace
the A9 PCB.
Table5-20. Error Messages 128, 129, 130, 131, 132, 133, 134, and 135 (2 of 8)
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