Specifications

8. If the instrument is fitted with Option 4X, press the Appl key and se

lect:

CHANGE APPLICATION SETUP

MEASUREMENT TYPE TRANSMISSION AND REFLECTION

NOISE FIGURE / NOISE FIGURE SETUP

ENR TABLE OPERATIONS

SAVE ENR TABLE

TO FLOPPY DISK

9. Save the following three files to floppy disk:

Vendor ENR Table

Internal ENR Extension Table

External ENR Extension Table

NOTES

Some of the ENR files may have been stored on the hard

disk; however, ENR files are not normally stored on the hard

disk. The External ENR Extension Table file will only exist if it

has been created by the user. To completely backup all the

files on the hard disk, it is essential that all of the previous

steps be completed.

10. Remove the CPU board from the instrument as described in Sec-

tion 7-4.

11. Remove the drops of RTV compound which hold the lithium battery

in place. Gently slide the battery sideways (gently lift up on the re

taining clip only a small since excess lifting will reduce contact pres

sure on the new battery).

12. Install a new battery and hold it in place with three drops of RTV

compound, as before.

13. Reassemble the instrument.

14. Turn the instrument ON and press UTILITY MENU and select FOR

MAT HARD DRIVE.

15. After formatting the hard drive, reload all files from the floppy disk

back onto the hard drive.

7-16 MS462XX MM

CPU ASSEMBLY REMOVAL AND REPLACEMENT