Zeiss humphrey HFA II-i series Field Service Manual page 441

Instrument: Humphrey Field Analyzer II-i
Subject: Calibration Backup Disk Problems
Status: Next Visit
Problem
Some HFA2i Calibration Backup Disks may contain corrupted data in the calcfg.ini or nvram.dat.file. If a
corrupted calibration disk is used to restore the calibration information, a complete loss of model, serial
number, hardware option codes, software option codes, and all calibration data may result.
Cause
At this time the principle cause of the corruption to the Calibration Backup Disk calcfg.ini file is not
known.
Solution
To prevent loading corrupted calibration files during the calibration restore process, the files on the
calibration disk will need to be evaluated. A binary content viewer is used (as described below) to
evaluate the calibration backup files. If the calibration backup disk files are corrupted, the files are to be
recreated with the HFA2i calibration files save utility. After creating the new files, evaluate them to see
that they are normal.
During the manufacturing process of the instrument an evaluation of the calibration disk files is
performed, similar to the evaluation process described in this bulletin. Manufacturing Implementation
dates for the verification of the calibration backup disk are found within this bulletin.
Binary Content Viewer
A computer utility program called a binary content viewer will allow the service engineer to look at the
binary calibration files, and see the corresponding hexidecimal and ASCI code representation. Running
the binary viewer program, the engineer can then evaluate the calibration files for corruption.
One binary content viewer program is HexDump32©, developed by Salty Brine Software, can be down
loaded from www.saltybrine.com. Hexdump32.zip is a 1.6 mb Zip file and will not fit on a single 3.5" 1.44
mb floppy disk.
Hexdump32 is a freeware program that can be downloaded, used and distributed freely.
Downloading Hexdump32.zip
1. Download the hexdump32.zip file to your desktop or a file folder on your hard drive from the
www.saltybrine.com
2. Using an unzip utility, extract the setup.exe file.
3. Accept all the default settings during the installation.
4. The Hexdump32 application is now installed on your system and is ready for use.
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SERVICE
BULLETIN
No.: FA2i-023
Date: 21 Jul 03
Pages: 3