Zeiss humphrey HFA II-i series, Field Service Manual

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Appendix K Humphrey Field Analyzer II - i
Confidential and Proprietary
Field Service Guide
K - 2 52235C1105
C Explain the difference between a file that has been copied and one that was backed
up using the Backup/Restore function in the disk menu. A copied file is one that was
stored to the floppy drive after completion of a test, one which was copied or
duplicated using the Copy or Duplicate Test functions in the File Functions Menu.
The copied file can be placed onto the floppy drive and recalled for viewing on the
CRT. A file that was backed up using the Backup/Restore function cannot be
accessed and viewed on the CRT. This concept is often a source of confusion.
K.2 Database Structure
Two identical patient databases coexist on the hard disk drive. The Primary or principle
database, and the Secondary database which is a duplicate of the Primary.
The Primary database is the principle database. That is, when a test is saved to the hard
disk drive, it is first saved to the Primary database and then saved to the Secondary
database. When a test is recalled from the hard disk drive, it is only recalled from the
Primary database. The Secondary database functions are transparent to the customer.
K.3 The Five “R’s” of Database Recovery
There are five basic steps to consider when attempting to correct a database problem:
Reboot............Recover............Reconstruct............Rebuild............Restore
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Reboot
If the patient database cannot be accessed, Rebooting or turning the power off-on may
correct the problem. This is often the simplest step to try. The instrument will attempt a
recovery if either (but not both) of the databases fails to verify or if recovery was deferred
(floppy only) prior to shut down. Rebooting or cycling power will also cause the
instrument to present the operator with the on-screen message to recover or make the
instrument a floppy-only system.
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Recover
The Recover option is very much like performing a restore from magnetic optical disk.
This option is selectable only when a problem with the Primary database has been
detected. If a problem occurs within the Primary database, the operator will receive an
on-screen message to either attempt to recover the database (
Fix Now ) or temporarily
make the instrument a floppy-only system. If recovery is selected, the software will attempt
to copy the Secondary database over the corrupted Primary database. If successful, the
database has been recovered. If unsuccessful, then the hard disk database is disabled and
the instrument can only be operated with a floppy disk database until it is repaired. The
doctor can also defer recovery until the end of the day or automatically on boot the next
day. This will allow the doctor to continue using the instrument so that he/she can test the
patients in the waiting room.