Troubleshooting R&S SMB
1407.0806.82 3.10 E-6
The instrument can also be switched off by means of the temperature monitoring circuit on the Basis
B
oard. If the temperature sensor on the Basis Board detects an over temperature (e.g. in the event that a
fan fails), the power supply is switched off via pin 13 of the power supply connector. It can only be
switched on again, after cooling down.
• Error: Signal generator starts up but display remains black
Description of error Possible error causes and further steps
CPU does not boot correctly
Check red LED on Basis Board (see Fig. 3-1).
If LED does not turn red approx. 1 sec after power on,
either the Basis Board FPGA does not configure
correctly or the CPU does not boot: try to update the
firmware, which includes the FPGA configuration data.
If this does not help: Change Basis Board
Cables are loose
Check cabling between Basis Board and Display
TFT display defective
Replace Front panel with TFT display
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