Anritsu 682XXB - Manual (Page 208)

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 W114 for a
>2.0 volt down converter detector output throughout the full
sweep.
G If the detector voltage is correct, replace the A10 PCB.
G 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.
G If the bias voltage is correct, go to step 6.
G 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.
G If the PIN switch drive voltage(s) is correct, go to step 7.
G If the PIN switch drive voltage(s) is not correct, replace
the A9 PCB.
Table 5-20. Error Messages 128, 129, 130, 131, 132, 133, 134, and 135 (2 of 8)
TROUBLESHOOTING
TROUBLESHOOTING TABLES