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Preliminary:
Before removing and replacing the BBRAM Chip it is necessary to
save the following calibration data to the hard disk: signal source Fre
-
quency, ALC, Source Lock Threshold, LO1 and LO2. Proceed as fol
-
lows:
Step 1. Press the Option Menu key (Enhancement key group) to
display the OPTIONS menu (left).
Step 2.
Select DIAGNOSTICS from the menu. Then select in se
-
quence: H/W CALIBRATIONS |DISK OPERATIONS
|SAVE TO HARD DISK |HW_CAL.ALL.
NOTE
Also save the calibration data to floppy disk. Label the
disk with calibration type (ALL), date, and system model
and serial numbers. Set the copy protect tab on the disk.
Properly safeguard the disk so that it will be available for
later use, as needed.
Step 3.
Switch the 373XXA power off. Remove the power cord.
Remove/Replace Procedure:
Step 1. Remove the top cover and the large card-cage cover to ex-
pose the A1 – A9 PCBs (refer to paragraph 8-4).
Step 2. Remove the A9 PCB from the unit.
Step 3. Locate and remove the BBRAM chip from the A9 PCB. See
Figure 8-3.
Step 4. Replace the BBRAM chip on the A9 PCB.
Step 5. Reinstall the A9 PCB, the large card-cage cover, and the
top cover.
Step 6.
Reconnect power cord. Switch 373XXA power on.
Post Replacement Procedure:
Recall the calibration data saved in the Preliminary step from the
floppy disk as follows:
Step 1. Insert the floppy disk with the previously saved Source
Frequency and ALC Calibrations Data in the 373XXA
floppy disk drive.
Step 2. Select DIAGNOSTICS from the menu (left). Then select in
sequence: H/W CALIBRATIONS |DISK OPERATIONS
|RECALL CAL FROM FLOPPY DISK|HW_CAL.ALL.
A9 PCB BBRAM CHIP REMOVE AND REPLACE
8-8 373XXA MM
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)
H/W CALIBRATIONS
(FOR SERVICE
ONLY)
PRESS <ENTER> TO
SELECT
HARDWARE
CALIBRATIONS
(FOR SERVICE
ONLY)
LO1
CALIBRATION
LO2
CALIBRATION
SOURCE FREQUENCY
CALIBRATION
SOURCE ALC
CALIBRATION
DISK OPERATIONS
PREVIOUS MENU
PRESS <ENTER> TO
SELECT
H/W CALIBRATIONS
DISK OPERATIONS
SAVE
TO HARD DISK
SAVE
TO FLOPPY DISK
RECALL
FROM HARD DISK
RECALL
FROM FLOPPY DISK
DELETE
FROM HARD DISK
DELETE
FROM FLOPPY DISK
COPY FROM HARD
TO FLOPPY DISK
COPY FROM FLOPPY
TO HARD DISK
PREVIOUS MENU
PRESS <ENTER> TO
SELECT