R&S SMB Troubleshooting
1407.0806.82 3.21 E-6
Troubleshooting – Basis Board Module
Supply Voltages
Before Troubleshooting on the Basis Board switch the R&S SMB on and measure the supply voltages on
its power supply connector (X101, see Fig. 3-5) and compare them to the values specified in the table
below. Pin 13 is the Power On-Signal for the power supply. As long as the voltage at this pin is +5 V the
power supply is switched off. The power supply is turned on by assigning 0 V to this pin. If one or more
voltages are not of the required level, the power supply is defective.
Pin at X101 Test Point Fuse
R&S SMB in stand by mode R&S SMB switched On
5…10 +5V F4, F70 V +4.7 V … +5.3 V
3, 4 +13V2 F3, F5 0 V +12.4 V … +14.2 V
2 -13V2 F6 0 V -14.2 V … -12.4 V
+3V3 0 V +3.1 V … +3.5 V
+28V 0 V +26.6 V … + 29.4 V
+3V0 0V +2.85 V … 3.15V
+2V5 0 V +2.38 V … +2.63V
+1V2 0 V 1.14 V … 1.26 V
1 +5V_STBY F9 +4.5 V … + 5.5 V Standby +4.5 V … + 5.5 V Standby
13 > +3 V < 0.8 V
14…20 GND GND
Fig. 3-4 Power Supply Connector of the Basis Board (1406.6700.05)
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