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By examining these displays in conjunction with other failure symp
-
toms, the failed assembly can be located.
Example: Suppose the Non-Ratio Parameter screen display shows
power holes above 270 MHz on all traces and in both sweep directions.
A possible cause for this condition is a failure of the Power Amplifier
assembly at certain frequencies. (Refer to Analog Subsystem Block Di
-
agram in Figure 7-2 on page 7-6).
LO1
This function allows user to verify whether the A1 LO1 PCB is operat
-
ing properly.
LO2
This function allows the user to verify whether the A2 LO2 PCB is op
-
erating properly.
SOURCE
This function allows the user to verify whether the Source Module is
operating properly.
Isolation Procedures The procedures in the following paragraphs will help you isolate the fault
to the major assembly.
Check #1 Proceed as follows:
Step 1.
Press Option Menu key and select the DIAGNOSTICS
menu option.
Step 2.
Select the READ SERVICE LOG menu option to display
the error entry associated with the system failure. Observe
the snap shot data included as part of the error entry and
note the sweep direction indication for each error code. (Re
-
fer to Table 5-3.)
TROUBLESHOOTING SOURCE/TEST SET/RECEIVER
373XXA MM 5-19
OPTIONS
TRIGGERS
REAR PANEL
OUTPUT
DIAGNOSTICS
MULTIPLE SOURCE
CONTROL
PRESS <ENTER> TO
SELECT
DIAGNOSTICS
START SELF TEST
READ SERVICE LOG
INSTALLED OPTIONS
PERIPHERAL TESTS
TROUBLESHOOTING
(FOR SERVICE
ONLY)
HW CALIBRATIONS
(FOR SERVICE
ONLY)
PRESS <ENTER> TO
SELECT