R&S SMU200A Troubleshooting
1007.9845.82 3.29 E-6
Error Error correction
No output level for Analog Wideband
I/Q In
Check output level for CW.
If not OK: Perform Troubleshooting -"Level Errors.
Setting on Vector Signal Generator:
RF ON
Analog Wideband I/Q In = On
0.35 V DC applied at I and Q
Measurement of Test Points:
DIAG_IQOP3_D_LCM_IX = -1.05 V to -0.85 V
DIAG_IQOP3_D_INX = 0.85 V to 1.05 V
DIAG_IQOP3_D_QX = -1.05 V to -0.85 V
DIAG_IQOP3_D_QNX= 0.85 V to 1.05 V
If these voltages are not OK:
Baseband processing by LCM is defective.
Call hardware debug page “Level”.
In “LCM (DSP status, OK)” block, compare DSP measured
value “bb rms” with setpoint value “uBBRMS”.
Deviation > 10%: Baseband RMS detector on LCM is defective.
If OK: IQOP3/RFM is defective.
Image rejection < 20 dB Call “Adjust I/Q Modulator Full Range”.
If error message appears, see “Troubleshooting with
Internal Adjustments”.
With setting Internal Baseband: Check frequency response
of DACIF board. Refer to chapter 1, Sections IQ Output,
Frequency Response and Imbalance.
Frequency response of DACIF OK: LCM is defective.
With setting Analog Wideband I/Q In: LCM is defective.
I/Q Swap is not functioning. Submodule LCM of IQOP3 is defective
Baseband gain is not functioning Submodule LCM of IQOP3 is defective
Faulty AM
In the Vector Signal Generator, both the LF-AM and the BB-AM are implemented using the I/Q
modulator. If I/Q modulation and the LF generator are functioning, the LCM is defective.
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