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5-38
690XXB/691XXB MM
Output Power Level Related Problems
(0.01 to 20 GHz)
Error 128 .01-2 GHz Unleveled
Description: Error 128 indicates a failure of of the down converter
leveling circuitry. The 690XXB/691XXB may or may not produce an RF
output in the 0.01 to 2 GHz frequency range. Thus, there are two trou-
bleshooting 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 690XXB/691XXB as follows:
a. 690XXB Setup:
CW/SWEEP SELECT: Step
F1: 0.010 GHz
F2: 2.000 GHz
Number of Steps: 400
L1: +1.00 dBm
691XXB 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
ALC Mode: Ext ALC Front
Leveling Menu: External Detector
Step 2.
Connect a detector to the 690XXB/691XXB
RF OUTPUT
con-
nector and connect the detected DC output of the detector to
the front panel
EXTERNAL ALC IN
connector.
q
If the warning message
UNLEVELED
no longer appears
on the front panel display, replace the down converter.
q
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 (1 of 8)
TROUBLESHOOTING
TROUBLESHOOTING
TABLES
Содержание 680 C Series
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