R&S SMU200A Troubleshooting
1007.9845.82 3.23 E-6
A Baseband Module can not be operated
Malfunction Reason and remedy
A baseband module can not be operated,
although it is visible in the front panel block
diagram.
The operating system may have disabled the
device.
To check for this, you need an external keyboard
and a mouse. If not present, put both to USB
interface connectors and reboot the unit.
To terminate the firmware, press ALT + F4. Then
select Start, Control Panel, System, Hardware,
Device Manager.
In the folder "Rohde & Schwarz supported devices"
search for the disabled device. Disabled devices
show a red cross in the icon. Double click to open
"Properties of the module". Click on the button
"Enable Device" and confirm the following popups.
Now the topic "Use this device (enable)" has to
show under "Device usage". Confirm with "Close"
button at the bottom of the window. Close all
windows.
To start the instrument firmware again, double click
the Vector Signal Generator Firmware icon.
Troubleshooting with Test Points and Debug Page
A diagnostic A/D converter on the DACIF board allows analog voltages at selected test points in the
instrument to be read out.
Normal action Error and error cause
Internal diagnosis switched on with:
SETUP - Test Points...
Select the desired path under Path.
Select the desired test point under Select Test
Point.
To operate set State ON
Note: The test points also include a test point for
the CPU temperature of FMR6 (front
module controller) and the CPU fan speed.
The measured voltage is displayed under Voltage.
“99.9999V” means that the test point does not
exist.
This value is also returned for queries concerning
the IEC/IEEE bus if a non-existent test point is
queried.
The diagnostic system operates with multiplexers
on each board to switch the desired testpoint to
the common line named DIAG on the
motherboard. Each test point is switched to the
line only for the time of a measurement and
switched off after it. The A/D converter is placed
on the DACIF board.
For troubleshooting refer to the following
chapters.
Check the displayed values against the values
specified in the respective sections concerning
troubleshooting on the module.
Major deviations from the named values indicate a
defect:
Change the module.
If all test points display nonsensical values, one of
the multiplexers on the modules maybe defective.
To check, remove modules one after another, to
find which module disturbes the common
diagnostic line. If values are nonsensical yet, it is
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