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4.5 SPECIAL MESSAGES
The AM 232 Manual Audiometer is a microprocessor-controlled instru-
ment which performs a self-check each time the instrument is turned
on (the self-check does not occur when instrument operation resumes
from sleep mode). Certain messages will be displayed to the operator
on the front panel LCD if any error in the instrument operation is de-
tected. These messages are described below.
4.5.1 CAL
When a transducer or frequency is selected which has a calibration
error (e.g., right earphone at 2000 Hz), the word "CAL" will be display-
ed to the operator. The audiometer will not function at this frequency
with this transducer, so that no invalid results can be recorded. The word
"CAL" will be displayed as long as the "problem" transducer and fre-
quency are selected. If the calibration error is an isolated situation,
changing either the frequency or the transducer (e.g., left earphone at
3000 Hz) will restore normal instrument function.
As in the case with any instrument malfunction, a certified service tech-
nician should be contacted immediately. Remember to make note of
the combination of transducer and frequency which resulted in the
"CAL" message.
4.5.2 Exx
When an error code consisting of an "E" and a two-digit number
(xx = number) appears on the audiometer's display, a system error has
been detected. The AM 232 Manual Audiometer will enter a "lock-out"
mode which will not permit the instrument to operate. The specific error
code will remain on the display for several seconds, then the instrument
will shut itself down completely. Should an Exx appear on the LCD, take
the following steps:
a. Power down, power up again. This could be only a temporary
failure and may never appear again. However, should the Exx
message appear again, proceed to steps b. and c.
b. Write down the numbers that appear on the display.
c. Contact your certified service representative and give them the
specific numbers you have recorded.
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