Troubleshooting R&S SMB
1407.0806.82 3.24 E-6
Troubleshooting B RF Board Module
The tests listed below ensure that an assumed error on the RF Board module is not caused by a defective
or incorrectly connected cable, incorrect adjustment or another module.
Internal Adjustment "Adjust All"
A comprehensive test of the module is to run the internal adjustment.
Normal action Error, possible causes and corrective action
Internal adjustments call:
SETUP - Internal Adjustments - Adjust All
Internal adjustment of the RF Board is executed.
Abort during adjustment:
The adjustments are all carried out exclusively on
the RF Board, only the Diagnostic A/D converter on
the Basis Board is needed.
If the voltage levels at all Test Points on the Basis
Board are in tolerance most probably the RF Board
is defective. Check the RF Board being supplied
correct (see page 3.24). If not in tolerance check
the Basis Board (see page 3.21)
Supply Voltages
Remove the RF Board from the chassis and connect cable W222 from the Basis Board. Switch on the
R&S SMB and measure the supply voltages of the RF Board at the series coils near its power supply
connector (X222, see Fig. 3-6). The measured voltages have to meet the values given in the table below.
If one or more voltages are not of the required level, check the Basis Board (see page 3.21).
Measuring Point R&S SMB switched On
Shielding enclosure GND
L6004 +3.1 V … + 3.5 V
L6001 +6.5 V … +7.5 V
L6000 +12 V … +14 V
L6002 -14 V … -12 V
L6003 +26 V … + 30 V
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