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Chapter 6
Adjustments
6-1 INTRODUCTION This chapter contains procedures that are used to restore the calibration
of the 373XXA signal source and the related source lock system assem
-
blies. Use these procedures after various signal source related assemblies
have been replaced due to troubleshooting or repair activities.
Please insure you have read and fully understand the servicing con
-
cepts for the 373XXA presented in Chapter 1 prior to continuing with
this chapter.
6-2 LO1 CALIBRATION This procedure uses the 373XXA internal diagnostics and calibration
menus to adjust the A1 1st LO PCB assembly. Perform this calibation
procedure if:
q
The A1 PCB is replaced.
q BBRAM chip on A9 Processor PCB is replaced and the Source
Lock Threshold Calibration data was not previously saved on
disk (that is, data is not available for recall from a floppy disk).
Calibration
Procedure
Perform the following steps:
Equipment Required
None
NOTE
Allow the 373XXA to warm-up at least 30 minutes prior to
performing calibration.
Procedure
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 then LO1 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:
373XXA MM 6-3