Nidek Medical ARK-1S, Operator'S Manual, Page: 78 / 112

72
DEVICE SETTINGS AND MAINTENANCE: Troubleshooting
* If the symptom cannot be corrected by the above actions, contact NIDEK or your authorized distribu-
tor.
The auto tracking function or
auto shot function does not
work.
• The auto tracking function or auto shot function may not have been
turned on.
Turn them on with the auto button.
• Room illumination may be reflecting on the cornea.
Change the location and try measurement again.
• The auto tracking function or auto shot function may not work on some
eyes such as keratoconus or recently-operated cornea.
In such cases, turn off the auto tracking function and start measurement.
• With patients who have substantial ocular ataxia or who cannot fixate
their eyes, the auto tracking function may not work.
In such cases, turn off the auto tracking function and start measurement.
• If the device is installed in the vicinity of a window resulting in exposed to
sunshine, light interference may adversely affect these functions.
Change the installed position of the device and start measurement again.
“PD ERR” is displayed on the
screen.
• Check whether the PD measuring window is not blocked.
A measurement error appears.
• The patient may have blinked during measurement.
Instruct the patient not to blink and try measurement again.
• The eyelid or eyelashes may obstruct measurement.
Instruct the patient to open their eye wider.
If the patient cannot open wider, gently lift the patient’s lid, paying atten-
tion not to press against the eyeball.
• The pupil may be too small for measurement.
Have the patient sit in a dark room for a while until the pupil enlarges
enough and try measurement again.
• The data may exceed the measurable limit.
The “CHECK MEASURING
WINDOW.” message is printed
out at device start-up.
• Clean the measuring window.

(page 96)
• If the measuring window is not dirty, make sure that the measuring win-
dow is not blocked at device start-up.
When Remedy