Welch Allyn Grason-Stadler GSI 17 Series Manuals

Manuals and User Guides for Welch Allyn Grason-Stadler GSI 17 Series. We have 1 Welch Allyn Grason-Stadler GSI 17 Series manual available for free PDF download: Service Manual

Welch Allyn Grason-Stadler GSI 17 Series Service Manual

Welch Allyn Grason-Stadler GSI 17 Series Service Manual (105 pages)

Brand: Welch Allyn | Category: Measuring Instruments | Size: 7.01 MB

Table of Contents

Table of Contents
3
Warning
7
Symbols on Schematics
8
Key to Symbols Used on Schematics

9
Table of

9
- CMOS Handling Precautions
  9
Foreword

9
- General Service Information
  9
- Catalog Listings
  10
Section 1 - Product Specifications

10
- Output Hearing Level Controi
  11
- Signal to Noise Ratio
  11
- Tone Switch
  11
- Transducers
  12
- Front Panel Controls/Rear Panel Connectors
  12
  - Headset
    12
  - Indicators
    13
  - Rear Panel Connectors
    13
  - Left and Right Earphone Jacks
    13
- Power and Power Line
  14
- Battery Pack Voltage
  14
- Environmental Conditions
  14
- Mechanical Dimensions
  15
- Material Used in Manufacture
  15
- Leakage Test
  15
- Headband Static Force
  15
- Earphone Cushion Attenuation
  15
- Accessories
  16
- The Front Panel Controls and Indicators
  18
- Standards
  10
- Test Stimulus
  10
Section 2 - Functional Description

18
- General Operation of Controls
  19
- Power up Initialization
  19
- Sleep Mode
  20
- Earphone Cords
  21
- Hum and Random Noise
  21
- Distortion and Frequency Shift
  21
Section 3 - Routine Maintenance

21
- Special Messages
  22
- Cal
  22
- Exx
  22
Section 4 - Calibration

22
- Quick Reference Calibration Controls
  24
- Quick Reference Calibration
  25
- Access to Calibration Controls
  26
- Calibration Mode Dip Switches
  27
- Calibration Mode Operation
  27
- Calibration Reference Thresholds
  27
- Calibration Mode Entry
  28
- Earphone SPL Calibration Mode
  29
- Mode Initialization
  29
- Routing Switch
  29
- Tone Type Switch
  29
- Extended Range Pushbution
  30
- Frequency Selector
  30
- Present Bar
  30
- Hldisplay
  31
- Response LED
  31
- Response Switch
  31
Stimulus on

31
Low Battery Segment

31
- LCD Segment
  31
Calibration Mode Exit

32
Calibration Data Storage and Validation

32
Calibration Mode Dip Switch

33
- Dip Switch S4
  33
- Dip Switch S3
  33
  - HL Selector
    34
  - Extended Range Pushbutton
    34
- Dip Switch S2
  35
- Dip Switch S1
  35
4.8.4

36
4.8.3

36
4.8.2

36
- Cal/Normal Switch
  36
- Hardware Diagnostic Test (DO)
  37
  - Test Initialization
    37
  - Low Battery Segment
    39
- Pushbutton Diagnostic Test (D1)
  39
- Attenuator Maximum Output Level Calibration (D4)
  46
- Disassembly
  49
Selection of the Diagnostic Mode

36
Disassembly Instructions

51
Parts Numbers

51
Accessories and Replacement Parts

52
Output Related Troubleshooting Symptoms

56
- Signal Flow
  56
- Block Diagram of Amplifier Signal Flow
  56
Left or Right Amplifier Troubleshooting Symptoms

57
- Attenuator Troubleshooting Hint
  58
- Block Diagram of Attenuator Signal Flow
  58
- Attenuator Circuit Test Check
  59
- Oscillator Troubleshooting Hints
  60
- Troubleshooting the Processor (U503)
  60
- Power Supply Related Problems
  61
- Switch Related Failures
  62
- Troubleshooting the Display
  62
- Error Messages
  63
- Block Diagram
  66
- Analog Circuit
  68
- Digital Circuit
  68
- Audiometer Module
  69
- General Notes
  70
- Microcomputer
  70
- Eprom U 5 0 5 )
  71
- Polled Controls
  71
- Timer
  71
- Input/Output (I/O) Port Designations
  72
- Display (Lcd)
  75
- Switched Capacitor Filter Controls
  75
- Oscillator
  76
- Output Routing and Power Amplifiers
  76
- Power Supply
  76
- ATTENUATOR and 10 Db RANGE EXTENDER
  77
- Distortion Adjust
  77
- Potentiometer Adjustment Procedure
  77
- Suggested Repair Parts
  78
- Audiometer Board Parts List
  85
- For Specific Serial Number
  89
- Power Module
  89
- Update
  89
- Battery Option
  92
- Battery Pack Installation
  93
- Battery Power Connection
  95
- Nicad BATTERY OPERATION
  96
- Alkaline Battery Installation/Operation
  97
- Battery Board Functional Description
  99
- Nicad BATTERY ASSEMBLY PARTS LIST
  99
- Battery/Charge Board Parts List
  101
- Test Circuit
  102
- Component Layout
  103
- Din Connector
  103
- Din Plug
  103

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