Welch Allyn Grason-Stadler GSI 17 Series - Access to Calibration Controls

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NORMAL/CAL MODE SWITCH

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-

NORM/CAL

-

R404

LINEARITY ADJUST

LR403

DISTORTION ADJUST

DIP SWITCH S2

(SQUARE PORT)

1

POSITION l/POSITION 4

---t

Figure 4-2:

ACCESS TO CALIBRATION CONTROLS

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18

Table of Contents

Default Chapter3
- Table of Contents3
- Warning7
- Symbols on Schematics8
Key to Symbols Used on Schematics9
Table of9
- CMOS Handling Precautions9
Foreword9
- General Service Information9
- Catalog Listings10
Section 1 - Product Specifications10
- Output Hearing Level Controi11
- Signal to Noise Ratio11
- Tone Switch11
- Transducers12
- Front Panel Controls/Rear Panel Connectors12
- Power and Power Line14
- Battery Pack Voltage14
- Environmental Conditions14
- Mechanical Dimensions15
- Material Used in Manufacture15
- Leakage Test15
- Headband Static Force15
- Earphone Cushion Attenuation15
- Accessories16
- The Front Panel Controls and Indicators18
- Standards10
- Test Stimulus10
Section 2 - Functional Description18
- General Operation of Controls19
- Power up Initialization19
- Sleep Mode20
- Earphone Cords21
- Hum and Random Noise21
- Distortion and Frequency Shift21
Section 3 - Routine Maintenance21
- Special Messages22
- Cal22
- Exx22
Section 4 - Calibration22
- Quick Reference Calibration Controls24
- Quick Reference Calibration25
- Access to Calibration Controls26
- Calibration Mode Dip Switches27
- Calibration Mode Operation27
- Calibration Reference Thresholds27
- Calibration Mode Entry28
- Earphone SPL Calibration Mode29
- Mode Initialization29
- Routing Switch29
- Tone Type Switch29
- Extended Range Pushbution30
- Frequency Selector30
- Present Bar30
- Hldisplay31
- Response LED31
- Response Switch31
Stimulus on31
Low Battery Segment31
- LCD Segment31
Calibration Mode Exit32
Calibration Data Storage and Validation32
Calibration Mode Dip Switch33
- Dip Switch S433
- Dip Switch S333
  - HL Selector34
  - Extended Range Pushbutton34
- Dip Switch S235
- Dip Switch S135
4.8.436
4.8.336
4.8.236
- Cal/Normal Switch36
- Hardware Diagnostic Test (DO)37
  - Test Initialization37
  - Low Battery Segment39
- Pushbutton Diagnostic Test (D1)39
- Attenuator Maximum Output Level Calibration (D4)46
- Disassembly49
Selection of the Diagnostic Mode36
Disassembly Instructions51
Parts Numbers51
Accessories and Replacement Parts52
- Troubleshooting53
- Diagnostic Mode Controls and Functions54
- Diagnostic Mode Function Controls55
Output Related Troubleshooting Symptoms56
- Signal Flow56
- Block Diagram of Amplifier Signal Flow56
Left or Right Amplifier Troubleshooting Symptoms57
- Attenuator Troubleshooting Hint58
- Block Diagram of Attenuator Signal Flow58
- Attenuator Circuit Test Check59
- Oscillator Troubleshooting Hints60
- Troubleshooting the Processor (U503)60
- Power Supply Related Problems61
- Switch Related Failures62
- Troubleshooting the Display62
- Error Messages63
- Block Diagram66
- Analog Circuit68
- Digital Circuit68
- Audiometer Module69
- General Notes70
- Microcomputer70
- Eprom U 5 0 5 )71
- Polled Controls71
- Timer71
- Input/Output (I/O) Port Designations72
- Display (Lcd)75
- Switched Capacitor Filter Controls75
- Oscillator76
- Output Routing and Power Amplifiers76
- Power Supply76
- ATTENUATOR and 10 Db RANGE EXTENDER77
- Distortion Adjust77
- Potentiometer Adjustment Procedure77
- Suggested Repair Parts78
- Audiometer Board Parts List85
- For Specific Serial Number89
- Power Module89
- Update89
- Battery Option92
- Battery Pack Installation93
- Battery Power Connection95
- Nicad BATTERY OPERATION96
- Alkaline Battery Installation/Operation97
- Battery Board Functional Description99
- Nicad BATTERY ASSEMBLY PARTS LIST99
- Battery/Charge Board Parts List101
- Test Circuit102
- Component Layout103
- Din Connector103
- Din Plug103

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