Audiometro welch allyn am232

Covers Welch Allyn AM232 Audiometer

Warranty
We, Grason-Stadler, Inc. warrant that this product is free from defects in material and workmanship and, when properly installed and used, will perform in accordance with applicable specifications. If within one year after original shipment it is found not to meet this standard, it will be repaired, or at our option, replaced at no charge exceptfor transportation costs, when returned to an authorized Grason-Stadler service facility. If field service is requested, there will be no charge for labor or material, however, there will be a charge for travel expense at the service center’s current rate. NOTE Changes in the product not approved in writing by Grason-Stadler shall void this warranty. Grason-Stadler shall not be liable for anyindirect, special or consequential damages, even if notice has been given in advance of the possibility of such damages. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE.

GSI Grason-Stadler
A Welch Allyn Company Grason-Stadler, Inc. 1 Westchester Drive Milford, NH03055-3056 Telephone: 603-672-0470 Fax: 603-672-0487

Service Manual 1717-0110, Rev. 4 , Printed January, 1991 (#1) Printed April, 1991 (#2) Printed January, 1992 (#3) Printed January, 1994 ( # 4 )

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Table of Contents
Warranty .L. i Table of .............................. : : 1 iii Warning ........................... vii Key to Symbols Used on Schematics .............. viii Foreword . . . . .. . . . . . . . . . . . . . . . . . . . . . ix SECTION 1 - PRODUCT SPECIFICATIONS 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 Catalog Listings .................. Standards ..................... Test Stimulus .................. Output Hearing Level Controi ............ Signal to Noise Ratio ............... Tone Switch .................... Stimulus . . . . . .. . . . . . . . . . . . . . . . Transducers ................ Front Panel Controls/Rear Panel Connectors ..... Power and Power Line ................ Battery Pack Voltage ................ Environmental Conditions .............. Mechanical Dimensions .............. Material Used in Manufacture ............ Leakage Test .................... Headband Static Force ............... Earphone CushionAttenuation ............ Accessories .................... 1 1 1 2 2 3" 3 3 5 5 5 6 6 6 6 6 7

SECTION 2 - FUNCTIONAL DESCRIPTION 2.1 2.2 2.3 2.4 2.5 Figure 2-l: Connectors, Controls, Indicators ... Front Panel Controls and Indicators ........ Rear Panel Connectors and Controls ......... General Operation of Controls ........... Power Up Initialization .............. Sleep Mode .....................8 9 10 10 10 11

SECTION 3 - ROUTINE MAINTENANCE 3.1 3.2 3.3 3.4 3.4.1 3.4.2 Earphone Cords .................. Hum and Random Noise .......... Distortion and Frequency Shift ....... : : : : Special Messages .................. CAL . . . . . . . . . . . . . . . . . . . . . . . . Exx . . . . . . . . . . . . . . . . . . . . . . . . 13 13 13 14 14 14

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SECTION 4 - CALIBRATION 4.1Quick Reference Calibration .......... Figure 4-l: Quick Reference Calibration Control; : : .... Figure 4-2: Access to Calibration Controls Table 4-l: Calibration Reference Threshold; .... .. Calibration Mode Operation ........................... 1 Cal/Normal Switch Calibration Mode Dip Switches ............ Calibration Mode Entry ............... Mode Initialization ............................Earphone SPL Calibration Mode Tone Type Switch .................. Routing Switch Frequency Selector' .................................. Present Bar ..................... H L l . . . . ................................ Extended Range Pushbution Response Switch ................... HLDisplay ..................... Response LED .................... Stimulus ON ..................... Low Battery Segment...