498
Assembly Replacement Procedures
Disk Drive
Disk Drive
There are two different types of disk drive installations that have been used in
the X-Series Signal Analyzers. Originally the drive was located inside of the A4
CPU assembly, which would need to be removed and opened up in order to
replace the drive. However, starting with serial number MY/SG/US49100000
the disk drive has been relocated such that it can be removed through the rear
panel of the instrument. Of course, instruments that originally had their disk
drive located inside of the A4 CPU assembly could have been upgraded with
Option PC2 and would now have a rear panel removable disk drive as well.
If the A5 Disk Drive is being replaced on an instrument with a serial number
greater than MY/SG/US49100000, or has had an Option PC2 upgrade, follow
the procedure below under the heading “Rear Panel Removable Disk Drive”. If
the instrument has a serial number prior to MY/SG/US49100000, and has not
had an Option PC2 upgrade, follow the procedure below under the heading
“Internally Mounted Disk Drive” for instructions on replacing the A5 Disk Drive.
NOTE Refer to Figure 14-47 and Figure 14-48 for illustrations of the difference
between the new CPU and old CPU assemblies.
CAUTION Electrostatic discharge (ESD) can damage or destroy electronic components.
All work on electronic assemblies should be performed at a static-safe
workstation. Refer to the documentation that pertains to your instrument for
information about static-safe workstations and ordering static-safe
accessories.
Rear Panel Removable Disk Drive
Drive Removal and Replacement
1. Before replacing the A5 disk drive it is highly recommended that the
factory calibration data be backed up to an external drive if at all possible.
If this data is not backed up prior to replacing the disk drive all instrument
adjustments and performance verification tests will need to be run after
the drive is replaced.
For information on how to backup this data see the “Calibration Data
Backup and Restore” section in Chapter 15, “Post-Repair Procedures.” of
this manual.
If this data cannot be backed up because the instrument will not fully
boot, go ahead and change the A5 Disk Drive and perform all adjustments
listed in Chapter 15, “Post-Repair Procedures.” for the A5 assembly.
2. Turn the instrument off and remove the AC power cord.
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