Anritsu 682XXB - Manual (Page 210)

5-44 682XXB/683XXB MM
Error 129 Switched Filter or Level Detector Failed
Description: Error 129 indicates a failure of either the switched filter
or level detector circuitry. The 682XXB/683XXB may or may not pro-
duce an RF output in the 2 to 20 GHz frequency range. Thus, there are
two troubleshooting paths for this problem—unleveled with output
power and unleveled with no/low output power.
Unleveled with output power (The warning message UNLEVELED
appears on the front panel display):
Step 1. Set up the 682XXB/683XXB as follows:
a. 682XXB Setup:
CW/SWEEP SELECT: Step
F1: 0.010 GHz
F2: 20.000 GHz
Number of Steps: 400
L1: +1.00 dBm
683XXB Setup:
CW/SWEEP SELECT: Analog
F1: 0.010 GHz
F2: 20.000 GHz
Sweep Time: 0.100 Sec
L1: +1.00 dBm
b. LEVEL/ALC SELECT: ALC Mode
ALC Mode: Ext ALC Front
Leveling Menu: External Detector
Step 2. Connect a detector to the 682XXB/683XXB RF OUTPUT con-
nector and connect the detected DC output of the detector to
the front panel
EXTERNAL ALC IN connector.
G If the warning message UNLEVELED no longer appears
on the front panel display, replace the directional coupler.
G If the warning message UNLEVELED is still displayed,
replace the A10 PCB.
Table 5-20. Error Messages 128, 129, 130, 131, 132, 133, 134, and 135 (4 of 8)
TROUBLESHOOTING
TROUBLESHOOTING TABLES