Welch Allyn AudioScope, Руководство по обслуживанию

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1.3 Introduction to AudioScopes
The operation and calibration of all five of these screening audiometers are
explained in this manual.
Important note to Service Personnel
Board Replacement on AudioScope 3:
Welch Allyn manufactures only the AudioScope3 as of Oct. 1986. As of
1996, starting with serial no.967000 a new version AudioScope3 utilizes a
Microcontroller (does not have ASIC) and is calibrated using the T-13765
Calibrator Box. It has digital potentiometers for calibration, not mechanical
pots. All previous models were calibrated using mechanical potentiometer.
Calibration of all types of AudioScopes is explained in this manual. If the
ASIC fails on an AudioScope 3, the whole board will be replaced with the
new board containing the digitally adjustable Microcontroller. This board
will fit the AudioScope3 with no modifications. Unit performance is the
same.
Obsolescence of Single Level AudioScope:
Single Level AudioScopes are over ten years old. Service Parts are not
available. Recalibrations CAN be performed on properly functioning single
level AudioScopes. For failed units, save the lamp, battery, and charging
stand/transformer for use with AudioScope3.