Anritsu 373XXA - Manual (Page 74)

Step 3. Determine whether the failure occurs during forward mea-
surements (S11, S21) and/or reverse measurements (S22,
S12):
If the problem occurs in both directions at all frequencies, the fault
could be in the Receiver Module, Signal Source Module, or Test Set
Module.
If the problem occurs in both directions at only certain frequencies, the
fault could be in the Signal Source Module.
If the problem occurs in only one direction, the fault could be in the
TEST SET MODULE.
Step 4. Run the 37XXX Test Software (2300-178) program to verify
operation of the Buffer Amplifier, A1 LO1 PCB, A2 LO2
PCB, and Source control PCB.
Use the information obtained in steps 1 – 4 above to determine
whether the failure occurs in the Source Module, Test Module or Re-
ceiver Module. Replace the suspected failed assembly, and perform any
required adjustment(s). Then retest. If the 373XXA still fails, contact
ANRITSU Customer Service Center for further assistance.
NOTE
To obtain technical service support from your nearest
ANRITSU Customer Service Center, refer to Paragraph
1-8, Service Support Information.
Check #2 If you have determined that the failure occurs in both sweep direc-
tions, only at certain frequencies, and that Error Code 5110 is re-
corded in the Service Log, use the following procedures to determine
which assembly may have failed:
Step 1. Set the 373XXA Start and Stop frequencies for the follow-
ing bands:
Band Start Stop
1 22.5*/40 MHz 2.0 GHz
2 2.0 GHz Upper band-edge frequency
for model. (20 GHz for
37369A)
3 20.0 GHz 40.0 GHz (for Model 37369A
only)
∗
Models 37311A and 37317A
Step 2. If the problem occurs in Band 1, replace the Down Con-
verter assembly and repeat test.
SOURCE/TEST SET/RECEIVER TROUBLESHOOTING
5-20 373XXA MM