Zeiss humphrey HFA II-i series, Field Service Manual

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Troubleshooting Humphrey Field Analyzer II - i
Confidential and Proprietary
Field Service Guide
5 - 24 52235C1105
ERROR MESSAGE PROBLEM SOLUTION
Failure to Initialize DVM The signal to initialize the
DVM chip on the motor board
did not occur. This message is
usually accompanied with
either a Start Up State 9 or 16
error message.
Print out the System Log.
Verify that these errors are not
occurring during system start
up. If they are, ensure the
room lights are dim during the
start up period.
This error will always occur if
the front cover is off or if the
black patch on the front cover
has fallen off.
Check the detector cable,
detector, its internal filters, and
the light detection circuitry.
Illegal Attenuation The film wedge and the glass
wedge do not provide enough
light attenuation.
Print out the Cal\Wedge
printout. Check the Wedge
Attenuation value. It must be
greater than 500.
Try recalibrating the Wedges.
If equipped with Blue-Yellow,
recalibrate the Blue Correction
after the Wedge calibration
(see Error 130009).
Check both the film wedge
and glass wedge. Replace and
recalibrate as required.
Unexpected Event An event occurred which the
system software and hardware
could not properly process.
This is a very low level error
involving the CPU. Normally,
rebooting the instrument will
restore functionality.
It is not likely that an error will
show in the System Log,
however, it should be checked.
Check Stepper Motors, Shutter
and Lamps
The projection lamp, yellow
bowl lamp, or bowl lamps
have degraded and have
become unstable.
Printout the Cal\Wedge
printout. Look at the
Projection Lamp Voltage. If
nearing 10 volts or below 7.8,
replace the projection lamp.
The yellow bowl lamp cannot
be tested, and if suspect,
should be replaced.
The white bowl lamps should
only be replaced in pairs.