Before Calling A Service Person - Canon TX-F Operation Manual

8.2 Before Calling a Service Person

Whenever a problem occurs or message appears on the monitor, take the countermeasures
indicated below according to the cause.
If function is still not restored, contact Canon representative or distributor.
8.2.1 If Problems Such as Following Occur
Problem
Measurements vary widely.
Level meter is low.
Settings in the SET mode have
changed for no apparent reason.
When power is turned OFF and
then ON again, message "LOW
BATTERY" appears on the mon-
itor.
READY lamp blinks and nothing
is displayed on the monitor.
Cause
Eyelid or eyelashes are covering the
pupil.
Examinee's eye is not fixed. (Eye is
moving restlessly.)
Examinee's eye is exposed to exter-
nal light.
Eyelid or eyelashes are covering the
pupil.
Frequent blinking.
The reflection rate of the cornea is
low.
Voltage of battery for data backup is
low.
Power-saving system is functioning
because no operation has been per-
formed for over 3 minutes.
– 45 –
8.2 Before Calling a Service Person
Remedy
Instruct the examinee to open the
eye wider, or lift up the eyelid lightly
with your fingers and measure
again.
Relax the examinee and have him/
her look at the eye fixation lamp.
Do not expose the examinee's eye
directly to bright artificial light or
sunlight.
Instruct the examinee to open the
eye wider, or lift up the eyelid lightly
with your fingers and measure
again.
Tell the examinee to try not to blink,
or lift up the eyelid lightly with your
fingers and measure again.
Level meter will not be high in this
case. Continue the measurement.
Contact Canon or distributor for
replacement of battery.
Press any switch.