A9 PCB BBRAM CHIP | REMOVE AND REPLACE |
OPTIONS
TRIGGERS
REAR PANEL
OUTPUT
DIAGNOSTICS
MULTIPLE SOURCE CONTROL
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
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
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
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
Step 2. Remove the A9 PCB from the unit.
Step 3. Locate and remove the BBRAM chip from the A9 PCB. See Figure
Step 4. Replace the BBRAM chip on the A9 PCB.
Step 5. Reinstall the A9 PCB, the large
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 DISKHW_CAL.ALL.
373XXA MM |
