Troubleshooting R&S SMU200A
1007.9845.82 3.40 E-6
Tests on Submodule IOQOP3 LCM
T
he LCM module is probably defective if one of the following error messages appears. The tests listed
below can be performed with the IQOP3 to localize an error on the LCM.
The LCM regulates the gain and the output level of the RF signal paths on the IQOP3 and IQOP6.
Error Message DSP....
Error Error correction
The following, more precise error
descriptions may appear:
DSP read error
DSP check/communication error
DSP write zero data error
DSP communication error
Communication between the gain
control DSP and host computer via
the serial bus is faulty.
All other modules are found when firmware is started:
LCM is defective and must be changed.
No modules are found when firmware is started:
Check DACIF board .
Error Message Baseband.... or DAC...
Error Error correction
The following, more precise error
descriptions may appear:
Baseband adjustment error
Baseband offset error
DAC underflow (RMS Offset)
DAC overflow (RMS Offset)
DAC underflow (RMS Offset_I)
DAC overflow (RMS Offset_I)
DAC underflow (RMS Offset_Q)
DAC overflow (RMS Offset_Q)
DAC underflow (RMS Imbalance)
DAC overflow (RMS Imbalance)
Error during baseband detector
adjustment.
Error occurs at less than 50% progress bar of baseband
detector adjustments: LCM is defective and must be changed.
Error occurs at over 50% progress bar of baseband detector
adjustments:
Check analog outputs of DAC board.
If outputs are OK: LCM is defective.
Error Message I/Q cal... or DAC….
Error Error correction
The following, more precise error
descriptions may appear:
I/Q cal error
I/Q cal Newton error
DAC underflow (Offset_I)
DAC overflow (Offset_I)
DAC underflow (Offset_Q)
DAC overflow (Offset_Q)
DAC underflow (Gain_I)
DAC overflow (Gain_I)
DAC underflow (Gain_Q)
DAC overflow (Gain_Q)
DAC underflow (Quadrature)
DAC overflow (Quadrature)
Error during I/Q modulator
adjustment.)
Check input level from SSYN.
Input level < 8 dBm:
Check SSYN.
Input level > 8 dBm:
Check whether error occurs during IQOP3 or IQOP6
adjustment.
Error occurs during IQOP3 adjustment:
Check I/Q modulation below 3 GHz.
Error occurs during IQOP6 adjustment:
Check I/Q modulation above 6 GHz.
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