Tomey UD-600, Operator'S Manual, Page: 238 / 262

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6. Troubleshooting
Cause 6
The immersion attachment is used while the con-
tact mode is selected. Ultrasound gel is too much.
Remedy
Use proper amount of gel and see “3.6.6 a)”
for details.
Cause 7
Biometry probe is directly attached to the cornea
with Immersion mode.
Remedy
With the immersion mode, immersion attach-
ment must be used. See "3.6.6. a) How to
handle the biometry probe in the contact/im-
mersion modes" or by using the ultrasound
gel. When measuring by directly touching the
probe to the cornea, select the contact mode.
Cause 8
The converted ultrasound velocity is way off.
Remedy
Make sure that the velocity setting is prop-
erly selected. See ("3.6.3 b) Setting the type
of the eye to be measured and converted
sound velocity")
Cause 9
The eye contacting part of the probe is damaged.
Remedy
If such damage is found, immediately stop
using the probe and contact your local rep-
resentative.
Cause 10
Tear film was measured as a part of axial length
due to weak pressure on probe to cornea, or the
probe hits the patient eyelid to cause longer mea-
surement result.
Remedy
See "3.6.6. b) How to handle the slider for
chinrest when using the chinrest for mea-
surement". Push the joystick as much as the
front face of moving slider and that of fixed
table are aligned.
Cause 11
Patient's ocular fundus looked abnormal as staphy-
loma.
Remedy
If the fundus is in a strained shape, measure-
ment does not always correctly catch the vi-
sual axis. Measurement results vary on the
probe applying manner. If such abnormality
is considered, refer to "3.4 Assistant Func-
tion of Biometery" is recommended.