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Step 2.
Select DIAGNOSTICS from menu.Then select in se
-
quence: H/W CALIBRATIONS then LO2 CALIBRA
-
TION.
Step 3. Follow the directions displayed on the 373XXA CRT screen,
until calibration is completed.
Post Calibration
Actions
After the calibration process is completed, perform the following ac
-
tions, as appropriate:
If calibration passes:
Save the calibration data to (hard) disk, as follows:
Step 1. Press the Option Menu key (Enhancement key group) to dis
-
play the OPTIONS menu.
Step 2.
Select DIAGNOSTICS from menu.Then select in se
-
quence: H/W CALIBRATIONS |DISK OPERATIONS
|SAVE TO HARD DISK|HW_CAL.LO2.
NOTE
Also save the calibration data to floppy disk
for archival purposes as a backup in case of
a hard disk failure. Label the disk with cali-
bration type date, and system model and se-
rial numbers. Set the copy protect tab on the
disk. Properly safeguard the disk so that it
will be available for later use, as needed.
If calibration fails:
Step 1. Repeat the calibration. If it still fails, then proceed to
Chapter 5, Troubleshooting.
6-4 FREQUENCY
CALIBRATION
This procedure uses the internal 373XXA diagnostics and calibration
menus, in conjunction with a suitable frequency counter, to adjust the sig
-
nal source frequencies throughout the range of the 373XXA model being
calibrated. Perform this calibration procedure if:
q
The Source FM/Lock Linearity test in Chapter 3, Operational
Test, fails.
q
Other testing or troubleshooting reveals a possible problem with
the signal source frequency accuracy or phase lock loop.
q
Any of the following assemblies are replaced:
n
A21A1 Source YIG/Bias
n
A21A2 Source Controller
n
Down Converter
ADJUSTMENTS FREQUENCY CALIBRATION
373XXA MM 6-5