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At this point, the system software continues the boot-up process by
performing the following activities:
q
Issues command to A15 PCB to change display from TEXT mode
to GRAPHIC mode and display ANRITSU logo.
q
Performs basic communication tests between the digital system
(A13, etc.) and the analog subsystem (A1-A8, A21A1, A21A2);
this is part of a minimal self test.
q
Conducts an IF Calibration
q
Resets and loads the front panel state that was in effect prior to
the last power down
q
Starts the measurement process
NOTE
The system software fully controls the 373XXA VNA sys
-
tem after boot-up (with operator intervention and guid
-
ance). The system software is only loaded once upon initial
power up.
Troubleshooting
Boot-up Problems
To start the troubleshooting of boot-up related problems, perform the
following preliminary checks:
1. Note any error messages displayed on the CRT display during the
boot-up process.
2. Observe the front panel and the display during the boot-up pro-
cess for information as to which part of the process failed or did
not execute.
3. Verify that the system power supplies are working properly as per
paragraph 5-4, above. Note particularly the operation of power
supplies immediately after power-up.
4. Try to boot the instrument from the floppy disk and repeat steps 1
and 2 above.
Upon completion of the preliminary checks (above), perform the fol
-
lowing procedures, as appropriate.
Hard Disk Problem 1 If a hard disk problem is indicated during bootup from a floppy disk, but
the system can bootup correctly from the hard disk:
Step 1. Boot up from the hard disk, then format the Hard Disk us
-
ing the procedure below.
CAUTION
Formatting the hard disk will erase all files on the hard
disk. Before starting the disk formatting process, copy any
files you wish to save to a floppy disk.
SYSTEM DOES NOT BOOT-UP TROUBLESHOOTING
5-8 373XXA MM