The henson 3500 is a visual screener checking the eyes visual field. This particular model is mature with a manufacture date of sometime in the 1990′s.
Essentially it is a self contained computer, containing a single board computer, dedicated electronics board with an led array, a touch screen interface and a button press input. A parallel port is provided for connection to a canon printer for test result hard copies.
Considering this machine was functioning daily until the ie_Open error message which amounts to a pure testiment of the excellent build quality produced by the manufacturers and an internal inspection reflected this. Sometimes when a cover is taken off equipment the internal components appear to be thrown in with the cover hastily put on to stop anything falling out – not so with the Henson 3500. The build quality of this machine is on par with aircraft specification instruments we have seen. The build quality detail even extends to threadlocking every single nut to stop it coming loose. This machine is a true credit to the manufacturers.
OK, so we are investigating the error message shown when trying to run a vfp test – ie_Open – device already open. This error then descends to further errors, access violation as address 0049B82C in module sssp.exe and then many division by zero error messages. The program icons give the impression that the program was coded in delphi. First thoughts were of some kind of hardware error, an open/locked file or similar. Upon this the scripts in the diagnostics folder were checked. Ledtest2 showed LED Driver board failure but Qtest2 allowed, via a keyboard each led to be illuminated. How strange. Upon discovering a folder was missing which was replicated the direction changed to possible file corruption.
Two like for like machines were compared across a multipractice outlet. Check that the installed application is the same by performing a registry search for henson, we found version 3.15 on each machine. The good machine also showed LED Driver board failure when running Ledtest2, perhaps this script was never properly tested or is just to test certain elements? A full file copy was taken of the application from the known working machine and replicated on the faulty one. This was actually quite difficult on a machine hosted with Windows 95. Forget USB sticks as this required 10 floppy disks and a lot of use of the touch screen and the menu key on the attached keyboard.
After the files were transferred the faulty machine was rebooted and the test ran correctly. An excellent result all round.
Other points to check would be in the bios for the serial port. Ensure it is enabled. I did wonder at first if the bios battery could have gone but upon checking the time was indeed accurate and the serial port 1 and 2 were set to auto.
We did try and place a support call to the manufacturers but the person who deals with that model line was away on that day. For your reference the contact number is 01737 649300 or check their website http://www.h-pi.co.uk
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