Rohde & Schwarz R&S SMU200A, Service Manual

Page: 152 / 294

R&S SMU200A Troubleshooting
1007.9845.82 3.25 E-6
Normal action Error and error cause
Adjust Level
Baseband adjustment is performed.
Abort during baseband adjustment:
Progress bar at <= 0%:
Note error message in the INFO line:
DACIF board probably defective,
LO signal at IQOP3, X273 may be
missing,
RF input signal at IQOP3, X272 may
be missing.
Progress bar at <= 50%:
Error on LCM module
Progress bar at > 50%:
Cause is probably a malfunction on
DACIF and/or DAC boards.
Check with oscilloscope: The adjustment
procedure can be checked at the instrument
sockets for I-Out and Q-Out using an
oscilloscope .
If no signals can be measured there, the
cause of error is definitely on the DACIF
board.
If OK:
Switching matrix on submodule LCM
of IQOP3 may be defective.
Zero adjustment is performed.
Abort during zero adjustment: Error on IQOP3.
AM adjustment is performed. Abort during AM adjustment: Error on submodule
LCM of IQOP3.
Adjust I/Q Modulator – …Full Range .
The I/Q adjustments are now performed in
sequence for the modules IQOP3 and IQOP6 (if
fitted).
Abort during IQOP3 adjustment:
Check submodule RFM of IQOP3
Abort during IQOP6 adjustment:
Check module IQOP6.
To permit further troubleshooting, the option
“Continue Cal. on Error” can be activated by
enabling Protection Level 1:
SETUP
- Protection..
Enter 123456 for Protection Level 1 Password .
Cont. Cal on Error can now be activated in the
Internal Adjustment menu. This forces an
adjustment which was previously aborted to be
fully executed. This is useful for tracing errors and
allowes to use the instrument temporarily in
ranges without defects.
Notes:
Using this option may provoke secondary error
messages!
The benefits of this action largely depend on the
error and the module that caused it.
For example, continuation of level adjustment or
I/Q adjustment can provide information about a
particular weak point in the module.