Welch Allyn GSI 38 Service Manual Download Page 35 | Manualshive

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is performed by the 226 Hz band pass filter (U65). The filtered RMS microphone signal
is rectified to a dc level for input to the Microprocessor A/D convertor. This filtered signal
is level adjusted (U59) by the Microprocessor to establish an optimum operating range for
the system during the tymp sweep or reflex testing.

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Summary of Contents for GSI 38

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Page 2: ...able for any indirect special or consequential damages even if notice has been given in advance of the possibility of such damages THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED I...

Page 3: ...1 t t L c c k 4 c i I e PRODUCT SPECIFICATION 2...

Page 4: ...Tymp V4 Export 1738 9736 GSI 38 Auto Tymp V4 Export 100V 1738 9738 GSI 38 Auto Tymp V4 Export 240V DESCRIPTION The GSI 38 is an automatic acoustic admittance and reflex measurement system with a scre...

Page 5: ...MENT SYSTEM AUTO TYMP Probe Signals Frequenc y 226 Hz 3 Sound Pressure Level 85 5 dB SPL 2 0 dB Measured in a 2 0cm3 coupler ANSI Spec 90 dB SPL Max Harmonic Distortion 5 Acoustic Admittance Range 0 0...

Page 6: ...relative tymp will take longer Direction of Sweep Positive to Negative ACOUSTIC REFLEX ACTIVATING STIMULUS SYSTEM Stimulus Frequencies 500 1000 2000 and 4000 Hz Stimulus Freauencv Accuracv 3 Stimulus...

Page 7: ...um Probe LED indicators Green blinking Ready to test Green steady Test in progress Orange steady leak or other error Yellow steady Occlusion AUDIOMETER Test Stimulus Pure Tone Specifications A pure to...

Page 8: ...an 60 dB HL Tone Switch This electronic switch turns the stimulus signal on off with minimal audible distortion Modes Normal state Stimulus Off Activated state Stimulus On Rise Fall Time 20 50 msec Me...

Page 9: ...FM deviation 5 Transducers Headset TDH 39 Earphones with 60 ohm impedance Insert Phone Audiovox Model SM N Earphone Eartip Eartip adapter and cord Output impedances and voltages on back panel Left Ph...

Page 10: ...4KHz Frequency Up Down 250 500 or 8KHz Autoset Rotary Knob numeric dBHL Automatically controlled Present Press to turn on N A 10 dB L or R uses R phone for L or R contra Page scrolls through screens M...

Page 11: ...ltitude calibration or sea level calibration icon only in altitude calibration mode Generic Error Error Code Audiogram dBHL Frequencies cursor on frequency under test or tabular format Back Panel Conn...

Page 12: ...ERSION 1 1738 0520 Wall Chart Rolled 1700 l 030 Ass y Test Cavity 0 5 2 0 and 5 0 cc 1700 9622 Eartips Package screening 1738 0100 Instruction Manual 1738 9600 Printer Paper 3 rolls supplied with new...

Page 13: ...n 4 installed at factory Carrying Case Dust Cover Patch Cord 1Ea Subject Response Handswitch Audiocups Service Manual Printer Paper Thermal 4 10 16 cm wide 5 rolls Test Headset Ass y TDH 39 8000 O 142...

Page 14: ...i i L i i c FUNCTIONAL DESCRIPTION 13 c...

Page 15: ...eening acoustic reflex measurements The third version provides testing capability for all three test modes i e tympanometry alone tympanometry combined with ipsilateral and contralateral screening aco...

Page 16: ...s test tone when present bar is depressed causes the steady symbol to appear on the display Pulsed used during Audiometry mode to select a pulsed tone when the present bar is depressed causes the puls...

Page 17: ...d Reflex mode R used to identify right ear under test so that data stored in memory and or printed is properly identified for Versions 3 and 4 used to select right earphone for audiometry L used to id...

Page 18: ...loading instructions Figure 2 3 Printer and Display The display indicates test mode parameters for test and test results See Figure 2 3 for location of display Figures 2 4 through 2 8 show the indivi...

Page 19: ...gure 2 7 Display Format TYMP REFLEX Test Reflex test results given in dB HL and also shown with a tracing Figure 2 8 Display Format for AUDIOMETRY REAR AND BOTTOM PANEL LABELS CONNECTORS The rear pane...

Page 20: ...ndswitch Input impedance 47 k ohm pulls up to 5 volts Connector for contralateral insert phone 1 ohm 2 5 volts rms maximum open circuit Connectors for right and left earphone 130 ohm 2 50 volts rms ma...

Page 21: ...NS To initiate the quick check select the Tymp only mode and insert the probe into the 0 5 cm3 opening on the test cavity See Figure 2 l 1 NOTE Since the GSI 38 is designed to start automatically it i...

Page 22: ...e value placed next to the letters ECV 2 0 If you wish the same sequence can be followed with the 5 0 cm3 opening on the test cavity To keep a record of this test cavity calibration check simply press...

Page 23: ...71 is displayed in the bottom right corner of the display until the probe is in the 2 0 cm3 cavity STEP 2 Place the probe into the 2 0cm3 cavity provided with the instrument and check cm3 value agains...

Page 24: ...the factory during production Program Mode User Selections i L L h l Reflex HL Curve l Print Audiogram Reflex HL only Print Aud Table Reflex Yes No l Normal Box ASHA Pm Header GSI Normal Box Off Pm He...

Page 25: ...pear next to Pm Header Custom It is now possible to exit the program mode or to sequence on the next user selection To exit the program mode press the pushbutton labeled PROG Enter a single test resul...

Page 26: ...en or printout AUDIOGRAM RANGE All eleven frequencies are available during audiometry or the range can be abbreviated to eight frequencies The default setting is Aud Range Normal To select the abbrevi...

Page 27: ...ting PAGE to this test result and press the M pushbutton This causes that particular test result to be erased from memory The erase mode is accessed when the operator selects a test to erase and press...

Page 28: ...ess the PRINT SCREEN pushbutton To print all tests in memory simply select the PRINT ALL pushbutton When PRINT ALL is pressed and two audiogram tests are stored in memory they will combine under the f...

Page 29: ...CIRCUIT THEORY L 28...

Page 30: ...ICROPROCESSOR CONTROLS THE FOLLOWING FUNCTIONS Communication to the Tymp Microprocessor Asynchronous serial communications data is transmitted and received using the processors built in serial communi...

Page 31: ...stic modes Dip Switches Dip switches 1 thru 4 are connected directly to the microprocessor A D convertor Dip switches 5 thru 8 are connected to the switch input buffer U31 These dip switch selections...

Page 32: ...e attenuator may be set to any level within this range by adjusting the DC voltage present at the EC line pin 3 This input pin is connected to a Digital to Analog Convertor DAC U53 that controls the o...

Page 33: ...the RAM through port D of the micro controller to the serial to parallel convertor U19 The dot drivers U16 U17 that are connected to U19 sink the current through the associated print head dot element...

Page 34: ...obe is removed from the ear canal the pump returns to the home position Monitoring of the Pressure Transducer Output The pressure Transducer output is monitored by the Tymp Microprocessor U7 A D input...

Page 35: ...MS microphone signal is rectified to a dc level for input to the Microprocessor A D convertor This filtered signal is level adjusted U59 by the Microprocessor to establish an optimum operating range f...

Page 36: ...i L c i k t CALIBRATION t 35...

Page 37: ...OUND LEVEL METER ARTIFICIAL EAR 2 cc COUPLER GSI 1700 2005 OR B K DB0138 9A 6 cc COUPLER OR B K ARTIFICIAL EAR B K 4153 MANOMETER VOLTMETER RMS FREQUENCY COUNTER 1700 l 030 TEST CAVITY SMALL STANDARD...

Page 38: ...ration into EEPROM When a new microprocessor or Auto Tymp Board is installed Default Data should be loaded Load Default Data by setting Dip Switch positions 6 7 and 8 to the ON position Set the Cal No...

Page 39: ...6 7 and 8 are in the OFF position 2 Power up the unit L 3 Slide the Cal Normal Switch to the Cal Mode position The display should appear as follows 7 L CALIBRATION MODES L L c i l ATTEN MAX CAL PRINT...

Page 40: ...e tone The Tone Indicator should now be present on the display Use the p Hz F to select the desired frequency for calibration Adjust the dB HL knob until the output level for currently display frequen...

Page 41: ...function When the Tone Bar is OFF or inactive the current hearing level is displayed as shown above When the Tone Bar is pressed ON or active the stim on indicator will appear on the display and the...

Page 42: ...dard device Below is an example of a microphone frequency response curve MICROPHONE CALIBRATION CHART l 5 dB 1 0 1 5 10 1 5 Provo Utah I _ q I _ i _ _ _ 1 __ _ _ _i I 11 1 1 I s 20 Hz 50 1DO 200 500 1...

Page 43: ...s follows Frequency Hz 125 250 500 750 1000 1500 2000 3000 4000 6000 8000 Default HL 40 60 80 80 80 80 80 80 80 80 60 Because the 38 automatically adds the ANSI RTL and reference HL values on the disp...

Page 44: ...eF Hz Keys to position the cursor at Custom RTL Cal on the display 2 Press the IFZF Key to enter the Custom RTL Cal Mode 3 Press thewlHz c Keys to select the desired frequency 4 Adjust the dB HL dial...

Page 45: ...6 Press the m Key to start the microphone calibration process The display will update to the following steady state display I After a few seconds the SAVED indicator will extinguish and the 1 2 indica...

Page 46: ...play will update to the following flashing display COMPLIANCE CAL 2 2 ECV 2 0 cm3 At this point place the probe into the 2 0 cc test cavity 4 Press the PI Key to start the 2 0 cc calibration The displ...

Page 47: ...ts then adjust the i 1 Hz Fj Keys until the cm XXX value indicates the appropriate volume measurement for the customer site elevation according to the following altitude table Altitude Barometric Pres...

Page 48: ...a manometer NOTE Manometer internal volume must be less than 5 cc s Press the 1 Key At this point the pump will pressurize to 200 daPa Use the IzIHz I Keys to adjust the pressure on the external manom...

Page 49: ...A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E F G H I J K L R N O P Q R S T U V W X Y Z A B C D E F G H I J K L R N O P Q R S T U V...

Page 50: ...S3 To Be Defined Normal Cal Mode Operation S4 _ To Be Defined Normal Cal Mode Operation S5 To Be Defined Normal Cal Mode Operation S6 Tymp Reflex Default Data Normal Cal Mode Operation S7 Audiometer...

Page 51: ...TROUBLE SHOOTING L b L I 4 50...

Page 52: ...on power up if non recoverable replace Microprocessor U34 03 Watch Dog Timer Timeout the Watch Dog Timer Circuit monitors the Microprocessor s operation The Processor must periodically send an I m Oka...

Page 53: ...sor U34 Invalid Keycode detected in CMDTSK if non recoverable possible defective Switch Panel Switch Buffer U26 U27 or U28 or Microprocessor U34 Invalid Keysource detected in CMDTSK same as above Inva...

Page 54: ...ich is ignored due to mode GSI vs Custom RTL Calibration status Read Error from EEPROM Printer Calibration Data Read Error No test available to print Tymp Reflex Processor not responding to a command...

Page 55: ...upt Error Opcode Trap Interrupt Error External RAM Error Stack Overflow Error Config Register Error Bad Pointer to EEPROM Routine EEPROM Read Error in Norm or Alt Mode Couldn t Home Pump Undefined Non...

Page 56: ...de 82 L 83 L 84 Undefined Error Number Reported L L L i e A D Pressure Value out of range of Pressure Transducer Gain Error Remote Record Error Non Fatal Cal Data Read Write Error Reflex Test info not...

Page 57: ...L L L k DISASSEMBLY 56...

Page 58: ...IC FITTING REMOVE CABLE CLAMP SCREW MARKED C AS SHOWN IN DRAWING 1 AND ENLARGED DETAIL VIEW A GENTLY LIFT THE CABLE STRAIN RELIEF OUT OF THE BOTTOM CASE SIDE PANEL TO REMOVE HL BOARD ASSEMBLY DISCONNE...

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Page 61: ...AR OF THE HOLDING PINS LIFT PRINTER OUT OF CASE PRINTER CONNECTOR BOARD REMOVAL DISCONNECT ALL REAR PANEL CONNECTORS OPEN CASE REMOVE AUDIO TYMP BOARD DISCONNECT Jl J2 FROM PRINTER CONNECTOR BOARD REM...

Page 62: ...SEMBLY PRINTER CONNECTOR BD 1738 4710 ASSEMBLY H L BD 1738 4715 LENS DISPLAY 1738 7002 COVER PAPER 1738 7020 SUPPORT PUMP 1738 704 1 COVER CALIBRATION 1738 7042 BLOCK HINGE 1738 7055 PANEL POWER BLANK...

Page 63: ...I L L c t t AUDIO TYMP BOARD ASSEMBLY DRAWINGS SCHEMATICS 62...

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Page 73: ...5 0000 5905 0002 59334064 5904 4053 5905 0138 1738 0510 5904 6264 5905 0373 5905 0273 IC SMT 74 HC 4538 DUAL MULTIVIBRATOR IC MC 3479 STEP MOTOR DRIVER SEE U14 5905 4538 5431 9697 IC SN 754377 QUAD PE...

Page 74: ...E U45 U60 SEE U44 U61 U62 SEE U43 U63 U64 SEE U5 U65 SEE U43 U66 SEE U48 U67 SEE U43 U68 SEE U5 U69 SEE U44 DIODES CR1 CR3 DIODE SMT MMB0914L CR4 DIODE ZENER 1N759A CR5 CR6 SEE CR1 CR3 RESISTORS POTEN...

Page 75: ...E R6 SEE R27 THERMISTOR SMT 100K 10 RES SMT 23 2K 18 12W SEE R7 SEE R2 RES SMT 2 49K 1 12W RES SMT 61 9K 1 12W SEE R 1 1 R13 SEE R6 RES SMT 2 05K 1 12W SEE R 1 1 R13 RES FILM 332 OHM 1 25W SEE R3 RES...

Page 76: ...W R90 SEE R43 R91 SEE R34 R92 SEE R25 R93 SEE R2 R94 SEE R35 R95 SEE R34 R96 SEE R4 R97 SEE R39 R98 SEE R85 R99 SEE R2 R100 RES SMT 8 25 1 12W R101 R102 SEE R74 R103 SEE R6 R104 R105 SEE R74 R106 SEE...

Page 77: ...F 20 35V SEE C2 SEE C5 SEE C2 CAP SMT CER SEE Cl3 4450 6311 4500 l 041 4500 4742 4550 l 052 SEE C2 CAP SMT CER 01uF 10 50V SEE C2 4500 l 301 SEE C2 CAP SMT CER 1000PF 5 50V CAP TANT AXAL LEAD 100uF 20...

Page 78: ...EE C25 SEE C2 SEE C25 SEE C5 SEE C50 SEE C2 SEE C50 SEE C2 CAP SMT CER 33pF 5 50V SEE C5 CAP SMT CER 022uF 10 50V SEE C2 SEE C36 CAP SMT TANT 22uF 10 35V SEE C50 SEE C2 CAP POLYPROP 047uF 5 50V SEE C2...

Page 79: ...RT ANGLE LKG HEADER SHROUDED 1 ROW 4 PIN HEADER SHROUDED 1 ROW 6 PIN HEADER RT ANGLE 2MM SP 12 POSITION CONN MALE JACK 5 PIN DIN JACK PHONE PC MTG LOW PROFILE CONN RT ANGLE TELE 6 CONTACT CONN STRIP S...

Page 80: ...PROBE 79...

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Page 84: ...NUMBER 1738 3200 1737 0430 1737 201 0 1737 6004 1738 1000 1738 4700 1738 7025 1738 7030 0028 7576 J 0028 7577 d 5855 0010 7044 0950 4314 0033 7044 200 1 PROBE BOARD PARTS LIST DESIGNATION DESCRIPTION...

Page 85: ...47 uF 20 10V CAP SMT CER 1uF 10 35V SEE Cl SEE C3 SEE Cl CAP SMT CER 0033uF 10 50V SEE Cl 4500 l 031 4550 4762 4550 l 041 Lc 4550 3321 a CR1 LED GREEN 130 DIA CR2 LED ORANGE 130 DIA CR3 LED YELLOW 130...

Page 86: ...NOSECONE 0 RING PARTS LIST DESIGNATION DESCRIPTION PART NUMBER L KIT NOSECONE W RING GREASE CONSISTING OF KIT GREASE O RINGG L NOSECONE THREADED W RING 85 1738 9605 1738 9610 1737 6004 5855 0010...

Page 87: ...L L L L PUMP 86...

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Page 89: ...i PRINTER e 88...

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Page 91: ...TION DESCRIPTION ASSEMBLY PRINTER CONNTECTOR BD CONSISTING OF PART NUMBER 1738 4710 L J1 CONN FIAT CABLE 20 CONTACT 4230 1620 J2 CONN FIAT CABLE 4 CONTACT 4230 1604 ASSEMBLY CABLE PRINTER CONN BD 1738...

Page 92: ...I I c DISPLAY L L i i 91...

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Page 94: ...UID CRYSTAL DISPLAY PARTS LIST i i DESIGNATION DESCRIPTION PART NUMBER ASSEMBLY LIQUID CRYSTAL DISPLAY CONSISTING OF 1738 1010 ASSEMBLY CABLE LCD 1738 0200 i t i DISPLAY LIQUID CRYSTAL 240 X 64 5437 1...

Page 95: ...I I c ASSEMBLY L L i i 94...

Page 96: ...6 4204 0209 1 EARPHONE AUDIOVOX 470 ohm 8000 0037 1 EARTIP MODIFIED 8000 0255 k c i t i I L ASSEMBLY TDH 39 TEST HEAD SET PARTS LIST QUANTITY DESCRIPTION PART NUMBER X ASSEMBLY HEAD SET CONSISTING 80...

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