Rohde & Schwarz R&S SMU200A, Service Manual

Page: 168 / 294

R&S SMU200A Troubleshooting
1007.9845.82 3.41 E-6
Error Message CAL DAC… and DSP cal
Error Error correction
The following, more precise error
descriptions may appear:
Checking CAL DAC voltages
DAC underflow (CAL_DAC)
DAC overflow (CAL_DAC)
CAL DAC error
Setup IQOP3 CAL DAC voltages
DSP cal range underflow
DSP cal range overflow
Test diagnostic converter using a test point of a different
module.
If converter is OK: LCM is defective and must be
changed.
Error Message "DSP zero error"
Error Error correction
Error Message "DSP zero error"
Setting on Vector Signal Generator
RF OFF
Frequency 1 GHz
Read out test point
SETUP
- Test Point
DIAG_IQOP3_D_UDET
Voltage < 0 V : Error on RFM.
Voltage > 0 V : LCM is defective and must be changed.
Error Message IQOP3/6 settling error
Error Error correction
Gain control does not lock during
adjustment. Check gain control (section " Level Errors ", page 3.27 ).
Error Message BB AM adjustment error
Error Error correction
BB AM adjustment fails. LCM is defective and must be changed.
Error Message AM adjustment error
Error Error correction
LF AM adjustment fails. Test LF generator at LF output.
If OK: LCM is defective and must be changed.