OPERATOR
ERROR AND WARNING/
MAINTENANCE
STATUS MESSAGES
Error Message
Description/Remarks
Error 128
.01 – 2 GHz Unleveled
Indicates a failure of the Down Converter leveling circuitry. The 681XXA operates
normally but will have unleveled RF output in the 0.01 - 2 GHz frequency range.
Error 129
Switched Filter or Level
Detector Failed
Indicates a failure of either the switched filter or level detector circuitry. The
681XXA may or may not produce an RF output. Use caution and always determine
the output power level when operating the 681XXA in this condition.
Error 130
2 – 3.3 GH Switched Filter
Indicates a failure of the 2 - 3.3 GHz switched filter. The 681XXA may or may not
produce an RF output in this frequency range. Use caution and always determine
the output power level when operating the 681XXA in this condition.
Error 131
3.3 – 5.5 GH Switched Filter
Indicates a failure of the 3.3 - 5.5 GHz switched filter. The 681XXA may or may not
produce an RF output in this frequency range. Use caution and always determine
the output power level when operating the 681XXA in this condition.
Error 132
5.5 – 8.4 GH Switched Filter
Indicates a failure of the 5.5 - 8.4 GHz switched filter. The 681XXA may or may not
produce an RF output in this frequency range. Use caution and always determine
the output power level when operating the 681XXA in this condition.
Error 133
8.4 – 13.25 GH Switched Filter
Indicates a failure of the 8.4 - 13.25 GHz switched filter. The 681XXA may or may
not produce an RF output in this frequency range. Use caution and always
determine the output power level when operating the 681XXA in this condition.
Error 134
13.25 – 20 GH Switched Filter
Indicates a failure of the 13.25 - 20 GHz switched filter. The 681XXA may or may
not produce an RF output in this frequency range. Use caution and always
determine the output power level when operating the 681XXA in this condition.
Error 135
Modulator or Driver Failed
Indicates a failure of the modulator or modulator driver circuitry on the A9 PCB. The
681XXA may or may not produce an RF output. Use caution and always determine
the output power level when operating the 681XXA in this condition.
Error 136
26.5 – 40 GHz Modulator or
Driver Failed
Indicates a failure of the 26.5 - 40 GHz modulator or modulator driver circuitry on
the A14 PCB. The 681XXA may or may not produce an RF output in this frequency
range. Use caution and always determine the output power level when operating
the 681XXA in this condition.
Error 137
20 – 26.5 GHz Modulator or
Driver Failed
Indicates a failure of the 20 - 26.5 GHz modulator or modulator driver circuitry on
the A14 PCB. The 681XXA may or may not produce an RF output in this frequency
range. Use caution and always determine the output power level when operating
the 681XXA in this condition.
Error 138
FEU Unit or Driver Failed
Indicates a failure of the frequency extension unit (FEU) or FEU driver circuitry on
the A9 PCB. The 681XXA is still operable but it will not produce an RF output in the
20 - 40 GHz frequency range.
Error 139
33 – 40 GHz FEU Section Failed
Indicates a failure of the 33 - 40 GHz section of the FEU. The 681XXA is still
operable but it will not produce an RF output in the 33 - 40 GHz frequency range.
Table 6-1.
Self-Test Error Messages (3 of 4)
6-6
681XXA OM