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681XXC OM 6-7
Error Message Description/Remarks
Error 138
SDM Unit or Driver Failed
Indicates a failure of the switched doubler module (SDM) or SDM bias regulator cir
-
cuitry on the A14 PCB. The 681XXC is still operable but it will not produce an RF
output in the 20 - 40 GHz frequency range.
Error 139
32 – 40 GHz SDM Section Failed
Indicates a failure in the 32 - 40 GHz switched doubler filter path within the SDM.
The 681XXC is still operable but it will not produce an RF output in the 32 - 40 GHz
frequency range.
Error 140
25 – 32 GHz SDM Section Failed
Indicates a failure in the 25 - 32 GHz switched doubler filter path within the SDM.
The 681XXC is still operable but it will not produce an RF output in the 25 - 32 GHz
frequency range.
Error 141
20 – 25 GHz SDM Section Failed
Indicates a failure in the 20 - 25 GHz switched doubler filter path within the SDM.
The 681XXC is still operable but it will not produce an RF output in the 20 - 25 GHz
frequency range.
Error 142
Sample and Hold Circuit
Failed
Indicates a failure of the sample and hold circuitry on the A10 PCB. The 681XXC
still operates normally but the RF output may be unleveled during square wave
modulation.
Error 143
Slope DAC Failed
Indicates a failure of the level slope DAC on the A10 PCB. The 681XXC still
operates normally but RF output level flatness may be affected during analog
frequency sweeps.
Table 6-1. Self-Test Error Messages (4 of 4)
OPERATOR ERROR AND WARNING/
MAINTENANCE STATUS MESSAGES