Amber led solidly on for any test attempt
Indicates an occlusion. Remove the probe tip and clean the metal tubes with the
supplied cleaning kit.
Amber led blinking for any test attempt
Indicates an air pressure leak. If after trying several seal attempts in the ear it does
not clear, try running in a hardwall cavity. If leak persists, check the pump function
in the pressure cal portion of the Cal Mode. Also check the probe tip tubing very
carefully for any splits or slices.
Tymp peaks appear shifted in the pressure domain
Possible pressure cal error or restriction in the air pressure feed tubing. Check the
pressure cal in the Cal Mode. Restrictions can be identified by large overshoot
numbers (> 50 daPa) in the set -600/400 Mode.
Reflex Artifact In The Hardwall Cavity
Check for pinched probe tubes inside the probe box.
Replace the probe or check the stimulus cal levels.
Compliance or Y, B or G calibration shift
1) Tubing length from the probe box to the probe tip has a direct effect on calibra-
tion. If the length is altered, the calibration must be performed.
2) Perform an Altitude Calibration. If the calibration error persists, perform com-
pleteYcal orYBG cal in the Calibration Mode. If calibration is not possible, it
will be identified by HELP messages.
Grason-Stadler
Chapter 8
LCD problem symptoms and probable causes
Lcd completely blank, but probe led’s blinking
Check the contrast adjustment potentiometer.
Check LCD backlight inverter operation.
Lcd completely blank and probe led’s off
Check the integrity of power supply voltages at each board, CPU supply (+5 VDC)
being the most critical. Also check the contrast adjustment potentiometer.
Probe problem symptoms and probable causes
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