Grason-Stadler TM262 Service Manual

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Covers Welch Allyn TM262 Auto Tymp

Service Manuals

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. meet this standard, it will be repaired, or at our option, replaced at no charge except for 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.

Changes in the product not approved in writing by Grason-Stadler shall void this warranty. Grason-Stadler

shall not be liable 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, INCLUDING BUT NOT LIMITED TO, MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE.

If within one year after original shipment it is found not to

NOTE

ANY IMPLIED WARRANTY OF

’

WARNING

The GSI damage to equipment can result when a three-prong to two-prong adapter is connected

between the GSI 38 power plug and an AC outlet or extension cord. Additionally, those

GSI 38 Auto Tymps that are equipped with power transformers, use a specific transformer (8000-0260, 800-0261, or 8000-0262) which should not be interchanged with any other transformer or supply.

The GSI 38 is a specifically calibrated device and the periodic which the instrument may require should be done only by an authorized Grason-Stadler service technician.

is designed to be used with a hospital grade outlet. Injury to personnel or

service

and adjustments

PRODUCT SPECIFICATION

GSI 38 PRODUCT SPECIFICATIONS (RI)

CATALOG LISTINGS

1738-9700

1738-9705 1738-9706

1738-9708

1738-9710

1738-9715 1738-9716 1738-9716

1738-9720

1738-9725 1738-9726 1738-9728

1738-9730

1738-9735 1738-9736 1738-9738

GSI 38 Auto Tymp, GSI GSI 38 Auto Tymp, GSI

GSI 38 Auto Tymp, V2, GSI GSI 38 Auto Tymp, V2, Export, GSI 38 Auto Tymp, V2, Export, 240V

GSI 38 Auto Tymp, V3, USA GSI GSI 38 Auto Tymp, V3, Export, GSI 38 Auto Tymp, V3, Export, 240V

GSI 38 Auto Tymp, V4, USA GSI GSI 38 Auto Tymp, V4, Export, GSI 38 Auto Tymp, V4, Export, 240V

DESCRIPTION

38 38

Auto Auto

Auto

Tymp, Tymp,

Tymp,

Vl,

USA

Vl,

Export

Vi,

Export,

V1,,

Export,

240V

USA

V2,

Export

V3,

Export

V4,

Export

100V

Tymp + lpsi Reflex

Tymp +

Tymp

lpsi/Contra

+Ipsi/Contra

+ Aud.

Tymp + lpsi + Aud.

Reflex

The GSI 38 is an automatic acoustic admittance and reflex measurement system with a screening audiometer.

The instrument consists of a probe and a desk-to-base interconnected via a cable. It is a combination of GSI 17 and GSI 37 plus acoustic reflex testing capabilities, both ipsilateral and contralateral. The audiometric portion is a single channel pure tone audiometer, with a pair of air-conduction earphones. Int he

tympanometric mode, the measurement of acoustic admittance is corrected for the

acoustic admittance of the external auditory meatius, and the ear canal volume is

displayed. Also a test cavity assembly is provided.

INSTRUCTION MANUAL

The GSI 38 is supplied with an instruction manual which meets the requirements of the

applicable standards.

STANDARDS

Acoustic Admittance Accuracy

ANSI S3.39 - 1987

Aural Acoustic Impedance and Admittance Standard Type 3

(Middle Ear)

ANSI S3.6 - 1989

IEC 1027-l 991

IS0 645

IEC 601-l

Audiometric Standard Type 4 (Audiometer) Aural Acoustic Impedance/Admittance Type 3 Type 4 (Audiometer) Medical Electrical Equipment General Requirements For Safety

Designed to Meet International Standards Organization requirements fo r Magnetic Compatibility and Safety

ACOUSTIC ADMITTANCE MEASUREMENT SYSTEM - AUTO TYMP

Probe Signals

Frequenc y:

Sound Pressure Level :

Harmonic Distortion:

226 Hz,

85.5

d B

(ANSI <

Spe c

+/-

SPL ,

+/-

2.0

d B

SPL Max)

dB,

Measured in a 2. 0

cm3

coupler

Electro-

Acoustic Admittance Range

0.0 to 1.5

cm3 or 0.0 to 3.0

selected automatically for compensated

tympanogram.

0.2 to 6.0 The 0.2 to 6.0

cm3- ECV/cavity

limits for initiating pressurization (starting test)

cm3 is the sum of the ear canal volume and the middle ear admittance.

(Full pressure sweep for 6 cc up to 7000 ft. altitude with no leak)

+/- 5% or

Tvmpanogram Gradient:

Pressure interval at 50% of compensated admittance

+/-

0.1 cm

whichever is greater

peak.

Pneumatic Svstem

Pressure

Pressure sweeps to at least -100 dapa if tymps complete otherwise sweeps to -400 daPa

Pressure Accuracv: Rate of Sweep: 200

Test Time

Approximately 1

Direction of Sweep:

ACOUSTIC - REFLEX ACTIVATING STIMULUS SYSTEM

Stimulus Frequencies:

Range

daPa/sec -

(corrected for altitude): + 200 to - 400 dapa (1 dapa = 1.02 mm

water)

+/-

15% or

600

daPa/sec -

for tymp slopes

sec

(high relative tymp will take longer).

Positive to Negative

500, 1000, 2000, and 4000 Hz

+/-

for tymp slopes of

=,>

0.2 ml per 24

daPa

whichever is greater.

daPa

<0.2

ml per 24

daPa

+/-

Stimulus Freauencv Accuracv: Stimulus Total Harmonic Distortion: Stimulus

Output

IPSI:

(Time multiplexed with probe tone, 106 ms On/53 ms Off Cycle) CONTRA: (Steady tone, non multiplexed)

Equivalent Hearing Threshold Levels, in DB SPL

Levels:

500, 4000 Hz

1000, 2000 Hz

500, 1000, 2000 and 4000 HZ 90, 100, 110 db HL

<5% measured acoustically

where speaker driving signal

80, 90, 100 85, 95, 105 dB HL

except at 4 khz

is measured

Transducer

TvPe

Stimulus Tone

Frequency (HZ) Contra (Insert Phone)

(in HA-l Coupler)

IPSI

(in HA-l Coupler)

Contra (Insert Phone)

(in IEC 711 Coupler) Rise/Fall Time: Pressure:

Automatically set to the pressure of peak compliance - 20

5 to 10

Reflex Determination:

Test Time:

Approximately 2 -12 seconds, depending on number of test frequency

selections and if tymp only test. (four maximum) Probe LED indicators:

Green

blinking: Ready to test Green - steady: Test in progress Orange - steady: leak or other error

Yellow - steady:

500 1000

6.0

7.0

9.5

1.0

4.5 2.0

5.5 11.5

2000

6.0

4000

3.0

3.5

15.0

msec

Minimum compliance change - 0.05

Occlusion

daPa.

AUDIOMETER

Test Stimulus

Pure Tone

Specifications:

A pure tone is the only stimulus source for this

audiometer.

Discrete

Frequencies:

125,

250,500.750,

and8000

1000,1500,

Hz.

2000,3000,

Equivalent Hearing Threshold Levels. in dB SPL for TDH 39 Earphones: Frequency

Reference Frequency Reference

Frequency

(Hz) 125 250 500

Threshold

(dB)

(Hz)

Threshold

Accuracy:

(dB) 9.0

+/-

45.0 2000

Total Harmonic Distortion (From

25.5 11.5 7.5 3000

10.0

125Hz

40006000

9.5 15.5

to 3000 Hz, measured Acoustically at the

750

10001500

7.0 6.5 8000

13.0

Maximum HL, measured electrically at 4000 & 6000 Hz) < 3%.

4000,6000

Output Hearing Level Control

Calibrated in dB HL. Measured in increments of 5 Ranges:

Additionally a

"+1

frequencies by IO Accuracy

of all

125Hz -10to

500

to 6000 Hz

250

and 8000 Hz

dB"

Extended Range switch, which extends the Maximum HL at all

dB.

settings

of Hearing Level control:

125

to 4000 Hz

6000 to 8000 Hz

Signal

to Noise ratio (in

1/3

Octave):

(for levels less than 60 dB HL)

Tone Switch:

This electronic switch turns the stimulus signal on/off with minimal audible distortion.

Modes:

Normal state:

Activated state:

>70 dB

Stimulus Off Stimulus On

dBBHL

-10to90dBB

-10to70dBB

+/-

+/- 5

HL HL

or less than -10 dB HL

Rise/Fall Time:

20-50

msec

Measured at the -1 dB and -20 dB points on the signal envelope.

On/Off Ratio:

Above 60 dB HL

With the tone switch off, the output will be at least -10 dB below standard reference equivalent threshold with HL setting of 60

setting:

>70

dB.

Cross Channel Leakage: At HL settings of 70 dB or greater, the unwanted signal in

the non test earphone shall be at least 70 dB below the tone

in the test earphone.

Stimulus Signals

Continuous signals Continuous FM Pulsed

Signal Format

Continuous

Signal steady as long as present bar is depressed

Pulsed

Pulse rate:

Duty Cycle:

Rise/Fall Time:

2.5

pulses/sec

50%

20 - 50

msec On/Off Ration (between pulses): > 20 Frequency Modulation FM Rate: FM deviation:

Transducers

Headset: Insert Phone:

Output

5Hz

+/-

TDH-39 Earphones with 60 ohm impedance

Audiovox Model SM-N Earphone,

impedances and voltages on back

panel

Eartip, Eartip

adapter and cord.

Left

Phone 130 ohm 2.5 volts rms max open circuit Right Phone 130 ohm 2.5 volts rms max open circuit in Audiometer mode Insert Phone <1 ohm 2.5 volts rms max open circuit Subject response input 47 kohm pull up to 5 volts

DESK-TOP FRONT PANEL CONTROLS AND BACK PANEL CONNECTORS

FRONT PANEL CONTROLS

CONTROLS

Mode

Stimulus

Frequencies

Intensity

Tone on Stimulus

Extended Range

Left/Right

Recall or Page Memory

Scroll

TYMP & REFLEX

Tymp Tymp & Reflex

Program Ipsi, Contra or lpsi

Contra 500,

1K,

2K or 4KHz

Autoset

Automatically controlled

N/A L or R (uses R phone for

contra) Page (scrolls through

screens)

AUDIOMETER

Audiometer

Pulse, Steady or FM

Frequency Up, Down

250, 500,....or 8KHz

Rotary Knob (numeric)

dBHL

Present Press to turn on

10 dB

L or R

Clear

Program Mode

M- Erase Screen M- Erase All

Save (saves program

M- Erase Screen M- Erase All

Save

state)

Print Screen Print All

Paper Advance (Press to advance paper, or abort print during printing)

Power Switch Subject Response

Power On Switch on Back Panel Green indicator light on Front panel.

Subject Response Indicator on LCD screen

Display

The display consists of an LCD panel which will display alpha-numeric, icons and graphics (240 X 64 pixels). Items displayed are:

. . .

. . . . . .

. .

Frequencies (alpha-numeric) and Intensity (alpha-numeric) in

Tympanogram (graphics)

Ear Canal Volume (alpha-numeric) Tymp Peak-Admittance (numeric) Gradient (alpha-numeric) Tymp Peak-Pressure (numeric)

Left/Right Ear (symbol)

Memory Ml to

IPSI/CONTRA

(alpha-numeric) Reflex Tracing (graphics) Reflex with

dBHL/No Altitude calibration or sea level calibration (icon - only in altitude calibration mode.

. .

Generic Error (Error Code)

Audiogram

(dBHL,

format.

Back Panel Connectors

. . .

Left/Right Earphone Insert Earphone Power Cord Patient Response Switch

dBHL

Reflex (alpha-numeric)

Frequencies, cursor on frequency under test) or tabular

PRINTER Printer: Printed Data Format:

Used to provide a hardcopy of the test data.

Graphical area 3.75” horizontal X 6.75” vertical (Audiogram or Tymp & Reflex for 2 ears), 51 columns/in horizontal

4 0

rows /in vertical

Choice of Audiogram or Audiotable:

Printer

Speed:

approximately 1.5 minutes to print three screens Tymp and reflex data for each ear and audiogram for both ears.

and

3 choices of reflex printouts

Wallmount power supplies of various types with 5 pin DIN connections are available.

Either three prong plugs (grounded) or two prong plugs (ungrounded) are provided

depending upon the safety requirements of the country.

OR The internal power supply, powered by AC line, 50 or 60 Hz via IEC 320 power inlet with fuse and on/off switch on the rear panel, is also available, for the countries where

the wallmount power supplies are not available. Two

voltage ranges are provided 200 to 250 V or 90 115 V.

+/-

Line

Voltage variation

Line

frequency range

Line

Voltage Current

Power Consumption Line Frequency variation Low voltage input for Wallmount power supplies 10

10 %

60 Hz

0.2 amps at 120 V or 0.1 amps at 240 V AC. 15 watts maximum while printing

+/-

11 V DC 970

mA.

Hi Pot 3000 volts

SUPPLIED ACCESSORIES

VERSION 1

VERSION 2

VERSION 3

1738-0520 1700-l 030 1700-9622 1738-0100 1738-9600 1738-9610

(1738-0401

‘1738-0520

1700-1030 1700-9622 1700-9660 1738-0100 1738-9610

8000-0079

(1738-0402 1738-0520

1700-1030 1700-9622 1700-9660 1738-0100 1738-9600 1738-9610 8000-0175 8000-0079 (1738-0403

Wall Chart Rolled Ass'y

Test Cavity (0.5, 2.0 and 5.0 cc)

Eartips

Package (screening) Instruction Manual Printer Paper (3 rolls supplied with new unit) Kit, Grease, 0 Ring Label Version 1 installed at factory)

Wall Chart Rolled Ass'y

Test Cavity (0.5, 2.0 & 5.0 cc) Eartips Eartips

Package (screening)

Package (Contra Phone / Diagnostic) Instruction Manual Kit, Grease, 0 Ring Contra Insert Phone Ass’y

Label Version 2 installed at factory)

Wall Chart Rolled Ass’y Test Cavity (0.5, 2.0, & 5.0 cc)

Eartips Eartips

Package (Screening)

Package (Contra Phone / Diagnostic)

Instruction Manual Printer Paper (3 rolls supplied with new

unit)

Kit, Grease, 0 Ring

Test Headset Assembly (TDH-39)

Contra Insert Phone Ass’y Label Version 3 installed at factory)

SUPPLIED ACCESSORIES CONT.

VERSION 4

1738-0520 1700-1030 1700-9622 1738-0100 1738-9600

1738-9610 8000-0175 (1738-0404

OPTIONAL ACCESSORIES

1738-9680 1738-9620

4204-0505 7874-0156 8000-0155

1738-0110

1738-9600 8000-0175 Consisting of:

Carrying Case Dust Cover Patch Cord 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 8000-0046 4204-0147 Earphone Cord Ass’y 8000-0143 Earphone Cushion

8000-0079

Consisting of:

Contra Insert Phone Ass’y 4204-0209 Cable, Coaxial 8000-0037 Earphone, Audiovox, 470 ohm

8000-0255SVC Eartip

1700-9622

Eartips Contains:

1700-9600

Eartips Package Contra Phone / Diagnostic Contains:

Wall Chart Rolled Assembly Test Cavity (0.5, 2.0 & 5.0 cc) Eartops

Package (Screening) Instruction Manual Printer Paper (3 rolls supplied with new unit) Kit, Grease, 0 Ring Test Headset Ass’y (TDH-39) Label Version 4 installed at factory)

(1Ea.)

Head band Ass’y Earphone, 60 ohm, plastic, TDH 39P

Modified

Package Screening

2 Ea. of

19mm,

8mm 11mm,

size

Eartips

4 Ea. of 7mm Yellow, 8mm Pink,

10mm Green, 1 mm, Pink, 12mm Yellow, 13mm Blue, 14mm Green

(1Ea.) MX41AR

(1Ea.)

13mm, 15mm, 17mm,

9mm

Blue,

FUNCTIONAL DESCRIPTION

INTRODUCTION

INSTRUMENT DESCRIPTION

The

GSI

38 Auto Tymp is a versatile combination instrument which provides testing capability for tympanometry alone, tympanometry combined with screening acoustic reflex measurements, and screening audiometry. Four different versions are available to meet your individual testing needs. operation, tympanometry alone and tympanometry plus screening ipsilateral acoustic reflex testing.

A second version permits tympanometry alone and tympanometry

combined with ipsilateral and contralateral screening 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 acoustic reflex measurements, and screening audiometry.

tympanometry alone, tympanometry combined with ipsilateral acoustic reflex screening testing and screening audiometry. It is possible to field retrofit versions one, two and four with the full functionality provided with version number three original purchase.

The basic version provides two modes of

Finally, the fourth version allows

after

the time of

PROBE INDICATORS

The probe indicators are show in Figure

2-1

Figure 2-1: Probe Indicators

Yellow:

the probe is occluded; remove the probe and inspect for cause of

occlusion

Green lamp: blinking

GSI 38 Auto Tymps is ready to begin a Tymp; steady

green - test successfully started and in progress.

and a description follows.

P3 Orange:

a pressure leak has been detected.

FRONT PANEL CONTROLS AND INDICATORS

Figure 2-2: Front Panel

Power on indicator and label: indicator is illuminated when the GSI 38 is

receiving power.

Print Screen: pushbutton used to print the currently displayed page of memory.

Print All Memory: used to print all pages of data from memory.

Paper Advance:

causes paper to feed through printer; may be used to load

paper or to provide space between printouts.

FM: used during the Audiometry mode to select a frequency modulated test tone when the present bar is depressed; causes the letters FM to appear on the display when selected.

Steady: used during Audiometry mode to select a continuous 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 pulsed symbol to appear on the display.

(dB

Attenuator Knob

HL): used to increase or decrease the intensity of the

test tone presented in Audiometry mode; counterclockwise rotation causes the

intensity to be lowered; clockwise rotation causes the intensity to be increased.

FlO

dB:

+10

used to temporarily extend the intensity range by 10

dB;

causes a large + sign to appear on the display indicating that the extended range has been selected.

M+: save key; during Audiometry mode, causes the threshold information per

frequency to be saved on the display; during Program mode, causes option to

be selected; during Tymp/Reflex mode, causes frequency to be stored as a default parameter.

Fll

and > Hz:

selecting

Selecting < causes the cursor to move the next lower frequency;

causes the cursor to move to the next higher frequency.

F12

F13

F14

F15

F16

F17

F18

Present Bar:

Push downward to present test signal to appropriate earphone;

release to turn test tone off.

Prog(ram):

press to select Program mode screen which lists setting available to reflex presentation format, printout header format, audiogram vs. tabular format, display normal box, and identify frequency range for Audiometry mode.

Aud(iometry):

press to select Audiometry mode. (Available in Versions 3 & 4

only).

TYMP:

Tymp Reflex:

press to select Tympanometry only mode.

press select Tympanometty and Reflex mode.

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 identify left ear under test so that data stored in memory and/or printed is properly identified: for Versions 3 and 4, used to select

left

earphone

for audiometry.

F19

F20

F21

F22

F23

F24

F25

F26

F27

IPSI:

used to select an ipsilateral reflex test.

CONTRA: used

select a contralateral reflex test (available with Versions 2

and 3 only).

500: selects 500

as a stimulus during reflex testing. 1000: selects 1000 Hz as a stimulus during reflex testing. 2000: selects 2000 Hz as a stimulus during

4000: selects 4000 Hz

PAGE:

used to scroll through test results stored in memory.

a stimulus during reflex testing.

reflex

testing.

M-: used to erase currently displayed page of data from memory.

M-:

used to erase all pages of data from memory.

PRINTER AND DISPLAY

The printer cover can be removed to reload paper. See Figure 2-3 for location of the

printer and printer cover. Section 2-7 provides paper 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 individual display format for each test mode.

Figure 2-4: Display Format for

TYMP

Only Test

Figure 2-5:Display Format for TYMP/REFLEX Test

(Reflex

test results given as “Yes” or “No”).

Figure 2-6: Display for

(Reflex test results given in

TYMP/REFLEX

"dB

HL”).

Test

Figure 2-7: Display Format

(Reflex test results given in

Figure 2-8:

REAR AND BOTTOM PANEL

"dB HL"

Display Format for AUDIOMETRY

LABELS/CONNECTORS

The rear panel labels and connectors each one follows.

TYMP/REFLEX

Test

and also shown with a “tracing”)

are shown in Figure 2-9 and a description of

Figure 2-9: Rear Panel

Company name, address, model, serial number and country of origin.

Symbol denotes a

Type B, Class II Product per IEC 878 as referenced in IEC

601 Standard. Symbol denotes Attention, consult accompanying documents. Symbol indicates a service adjustment part that is intended for service personnel

use only. Connector for handswitch. 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 maximum open

circuit. Label describing low input voltage and current from wall mounted power supply.

5-pin

Power Input Jack.

DIN connector for external wall mounted power supply.

RIO

Power Switch with ON/OFF indicators.

NOTE

There is a symbol on the bottom panel that indicates

entry by qualified service personnel only. This symbol

is marked “B

in Figure

2-10

Bottom Panel.

Figure 2-10: Bottom Panel

Figure 2-11: Test Cavity

PRETEST

TYMP

CHECKS

For your convenience, a test cavity is provided with your GSI 38 Auto Tymp. This test cavity enables you to quickly verify, on a daily basis, the prober calibration of your unit.

GSI strongly recommends that you make this quick check a part of your daily routine. TYMP CALIBRATION VERIFICATIONS 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 important that the probe is inserted as quickly and as smoothly as possible. During the calibration check, the probe must be held carefully and without movement. Do not place the probe on the same counter as the instrument or any moving object during this check as mechanical noise will be picked up by the probe and interfere with the calibration check.

GSI

38 is designed to start automatically, it is

The calibration check will start automatically if the probe has been inserted into the

cavity properly. This is confirmed by the green lamp changing from blinking to a steady condition. If the orange lamp is illuminated, the probe is not properly positioned within

the cavity so that a large pressure leak exists. If the yellow lamp is illuminated, the

probe tip has been occluded.In either case, remove the probe and wait for the blinking

green lamp. Insert the probe once again. Clean the probe tip if necessary (XXXXXX). When the test sequence is completed, the green lamp on the probe is no longer

illuminated.

Remove the probe from the test cavity and note that the green lamp is

blinking once again. The display will indicate a flat line on the tympanogram along with

the value of the test cavity next to the letters ECV (ear canal volume) i.e., 0.5. The

letters NP will appear next to the labels

cm3

and

daPa

and three dashed lines will appear next to the letters GR (gradient). Since the test cavity is a hard-walled cavity, the tympanogram should be a flat line indicating that there is no mobility in the system. The GSI 38 places the letters NP next to the

cm3 and

daPa

headers to indicate that

there is no peak compliance and, therefore, no peak pressure can be determined

during the quick check. Also, since there is no compliance peak detected, it is not possible to calculate a gradient. Therefore, the GSI 38 displays the dashed lines when a gradient calculation isn’t possible. Using the same sequence, place the probe in the

test cavity opening

0.5

cm3 measurement except for the value placed next to the letters ECV 2.0. If you

wish, the same sequence can be followed with the 5.0

labelled

2.0

cm3

Note that the display looks the same as with the

cm3 opening on the test cavity.

To keep a record of this test cavity calibration check, simply press the print all

pushbutton on the front panel of the GSI 38. Since sound pressure will vary with altitude and barometric pressure, some variation

from the 0.5, 2.0 and 5.0 cm

readings may be observed. Your GSI 38 is carefully calibrated at our factory which is at approximately 250 feet above sea level. If you are located at an elevation of 1000 feet or higher, your instrument may need to be

recalibrated to account for your elevation (See Section XXXX). If is not necessary to

recalibrate for barometric pressure changes on a daily basis. Just keep in mind that a change in barometric pressure (i.e., from low to high or high to low) will slightly affect

the test cavity readings. ALTITUDE ADJUSTMENT The Altitude calibration adjustment allows the instrument operator to “correct” the ear

canal volume

(ECV)

measurement and test cavity volume measurement

for variations

due to altitude. Because the GSI 38 is a pressure-sensitive device which makes

measurements relative to ambient air pressure, changes in air pressure due to weather

or altitude will affect the ECV read-out of the instrument. The slight pressure change

resulting from changing weather conditions will usually yield volume read-outs within +/- 0.1

these cavity values by as much as 30%. These

the accuracy of the compliance measurement system in any way.

cm3

of the expected cavity value, but pressure changes due to altitude can shift

changes in pressure do not affect

However, many

instrument operators prefer that their equipment give ECV values as they would appear

at sea level. The altitude calibration mode allow the operator to adjust his/her Auto Tymp without the services of a qualified GSI representative.

TABLE 2-1 Altitude Correction

ALTITUDE CORRECTION

Altitude (ft)

1,500 2,000-3,500 4,000- 6.000

6.500- 7.600

6.600- 6.000 24+/-

6.500-10,000

---

2.1

2.2

2.3

2.5

Altitude

+/-

0.1

+/-

0.1

+/-

0.1

+/-

0.1

Table (cm3)

The altitude calibration mode can only be entered when the

GSI

38 is powered up from its “off’ state while the program mode pushbutton, PROG is depressed. Hold the PROG pushbutton for approximately five seconds.

STEP 1

When entering the altitude mode the display will read as follow:

Altitude Mode

ECV 2.0 cm3 9.99 Standard

(E71) 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

value against the altitude correction table for accuracy.

STEP 3

If the measured volume is not within the published table value

+/-

.1cc, then the operator should exit the altitude mode by pressing the PROGRAM MODE pushbutton and contact field service. Providing the measured volume agrees with the published

table

With

+/-

.1cc, the operator may proceed with the altitude adjustment.

STEP 4

the probe still in the 2.0

cm3 cavity, select the page pushbutton to enter the

custom calibration mode. Custom will appear on the fourth line of the display.

STEP 5

The value now displayed in the c m to the current altitude.

If the value displayed is 2.0 cc then the volume is adjusted to

the current site. If the value is not 2.0 cc

display area is the volume measured and adjusted

+/- .1,

then press the SAVE pushbutton M+ to customize the volume measurement to the current altitude. The measured volume should now read 2.0 cc.

STEP 6

To exit the altitude mode press the PROG pushbutton to return to normal mode.

PROGRAM MODE

To enter the program mode, select the

PROGram

pushbutton located on the front

panel. The following screen appears the first time you enter the Program mode after

you receive your GSI 38 from the factory. (in other words, there are the default settings

used at the factory during production).

Program Mode

Reflex HL + Curve

Reflex HL only Print - Aud Table Reflex Yes/No l Normal Box ASHA

* Pm Header GSI

Pm Header Off Pm Header Custom Aud Range Narrow

Note that these selections. fall into

five

User Selections

l Print - Audiogram

Normal Box Off

* Aud Range Normal

different groups of controls:

Reflex format for printer Print header format

Audiometric test result format

Status of normal box

Audiogram frequency range

The default setting for each group of controls has an asterisk

(*)

before it so that it is

easy to scan the settings selected for each group.

REFLEX FORMAT

Reflex test results can be displayed and printed in three different ways: reflex dB HL

plus curve; reflex

reflex

HL plus curve. This means that all reflex test results will appear on the

HL only; or reflex yes/no. The default setting for this grouping is

display and the printout with the following information.

NOTE

If you the square cursor next to the asterisk Header custom and press M+ to cause the line appear display.The word SAVED will appear at the lower tight

margin indicating that the custom header is still

selected.

had previous/y entered a custom header, position

(*)

in front of Pm

cursor

at the left-hand margin along the bottom of the

To move the cursor from the left-hand margin without inserting a letter or number,

select the character which represents a space (i.e., rotate the knob one position to right of the letter A). Use the > Hz pushbutton to move over to the next character position. Repeat this sequence until the cursor is moved over to the desired start position for the

first character to appear in your header.

Rotate the

HL knob to select the

appropriate characters to spell out the desired header. After selecting each character,

use the > Hz pushbutton to move over to the next character position. Once all of the header characters have been added, press the M+ pushbutton to save your header in

memory. The word SAVED will appear on the right-hand margin indicating that you

header is now saved. The square cursor will reappear 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

result and select print screen to see how the custom header looks. AUDIOMETRIC FORMAT DURING PRINTING The audiometric test results can be printed out in an audiogram format (PRINT

AUDIOGRAM) or in a tabular format (PRINT - AUD TABLE). The default setting for this function is the audiogram format.

NOTE

When a specific frequency is deselected for testing, the result will be frequency. threshold exists at that untested frequency.

Move the < or > Hz pushbutton

AUD TABLE.

Next, select the M+ pushbutton to save this format as the new default

parameter. Note that the

a break in the audiogram line at that

This eliminates the assumption that a

position the cursor in front of the description

word

SAVED appears in the lower right-hand comer of the

PRINT-

display to indicate that this new setting has been saved. With PRINT-AUD TABLE selected, all audiometric test results will appear in a table with the frequency range typed horizontally along the top of the table followed by two lines of test data. The test

results for the right ear will appear next to the letter R and below each frequency

tested. Similarly, the test results from the left ear will follow below the right ear results.

This setting (PRINT-AUD) selects the format for the printout only. An audiogram always appears on the screen while in this mode.

NORMAL BOX FORMAT

NOTE

It is possible to have the normal box, as described by tympanogram screen and printout. The boundaries for this normal box are -150 to

+100 daPa

and 0.2

cm3 to 1.4

cm3.

ASHA,

appear on the

daPa

NOTE

A compliance value of 7.5 automatically turn off the

ASHA

cm3 or greater will

normal box.

The normal box is the default setting. To deselect this normal box, move the square cursor with either the < or > Hz so that it is placed in front of the words Normal Box Off.

While the cursor is in this position, select the M+ pushbutton to save this feature as the

new default setting. Note that the word SAVED appears in the lower right-hand margin.

This message assures you that the normal box ill not appear on the tymp screen 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

abbreviated frequency range, position the square cursor in front of the feature Aud

Range Narrow. Press the M+ pushbutton to save this narrow range for audiometric

testing. Note that the word SAVED will appear in the lower right-hand margin and the

asterisk now appears in front of the narrow range selection. The normal range of

frequencies include 125 Hz through 8000 Hz. The narrow range of frequencies

includes 500 Hz through 6000 Hz. Please note that in the Aud mode, if the narrow range is selected, the < and > Hz pushbuttons will allow you to scroll through this

abbreviated frequency range only. Both the screen and printout will still be

labelled

with the full range of frequencies. i.e., 125 Hz through 8000 Hz.

EXIT PROGRAM MODE Exit the program mode by selecting the PROG pushbutton. Note that you return to the

test mode which was operational prior to entering the program mode.

TEST IN MEMORY The Tymp and TympReflex test results

test sequence

ends.

Audiometric test

are automatically stored in memory when the

results are stored in memory when the M+

pushbutton is pressed a total of eight memory locations are available with the GSI 38. Each test result is assigned a memory location number in order of sequence obtained starting with Ml and continuing up to M8.

To review the individual test results, press the PAGE pushbutton. Note that the screen

contains the appropriate format for each test type stored (e.g., tympanogram or audiogram). The memory number is located in the upper right-hand corner of each

screen.

If, for example, only five tests were stored in memory, only five memory

locations can be scanned. The memory can be scanned a page at a time by pressing

the PAGE pushbutton once and observing the results. The entire memory can be scrolled through by holding the PAGE pushbutton down continuously.

MEMORY ERASE

If there is a particular test result that you wish to delete before printing, 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 presses the M- pushbutton. The LCD displays a blank screen for erased

memories with the memory location number located at the top right corner. Upon exit form the erase mode the stored memories reshuffle and replace the empty memory with the remaining tests in the order in which they were run. The erase mode will be exited once the operator presses the PRINT ALL or ERASE ALL pushbuttons or any

pushbutton that would normally begin the setup of a new test. Please note that when the erase mode is entered, a current audiogram is no longer accessible to change or to store new HL values.

NOTE

The instrument is programmed to default to the right ear

at 0 audiometric test.

and 1000 Hz upon selection of a new

If you should wish to erase all tests from memory, press the M-(ERASE ALL) pushbutton. (For example, the test results have been printed and you wish to test another person).

NOTE

Be certain that you wish to remove all tests from

M--

memory before pressing the the erasure

pushbutton!

occurs

immediately upon pressing the

pushbutton because

M--

PRINTING TEST RESULTS

The printout will begin with a header if it is selected during the program mode (i.e.,

GSI 38 or a custom header designed by you). The next two lines contain space for entering the individuals name and the test date. This is followed by the test results in the order

that they were obtained/selected.

Either a single test can be printed from memory or the entire group of tests in memory can be printed. To print a single test from memory, use the PAGE pushbutton to arrive

at the desired test result to print.

Once this test is displayed, press 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 following conditions. There must be one left test and one right test sequentially stored in memory. A left and right audiometric pair of tests will not be combined if they are separated in the memory by a tymp test. Therefore, when tests are erased, the resorting could cause a change in left, right or right, left combined when

PRINT ALL is selected. Prior to selecting PRINT ALL the operator should scroll through the tests in memory to determine where the audiometric tests are located. This will help the operator to avoid combining tests from different patients.

CIRCUIT THEORY

The Microprocessors

GSI

The

38 operation is controlled by two

MC68HC1 1E1

microcontrollers. The

microcontrollers have an 8 bit CPU and additional built in peripheral devices. It was

designed using HCMOS technology which combines smaller size and higher speeds

with the lower power and high noise immunity of CMOS. On chip

bytes of

RAM

and 512 bytes

of EEPROM. The built in peripheral functions include:

memory includes 512

An eight

channel/8

bit analog to digital convertor

A 16 bit timer system

bit

An 8

pulse accumulator circuit

A real time interrupt circuit

Parallel input/output ports

A computer operating properly (COP) watch dog system which protects against

software failures. A serial peripheral interface (SPI) A serial communications interface (SCI)

Power saving wait and stop modes

The many functions incorporated by the microcontroller helps to reduce board space

requirements and the need for additional support

circuitry.

The audio microprocessor (U34) is the master of the system and has control over the tymp microprocessor (U7) which functions

as a slave.

THE AUDIO MICROPROCESSOR CONTROLS THE FOLLOWING FUNCTIONS:

Communication

to the

Tymp

Microprocessor: Asynchronous serial communications data is transmitted and received using the processors built in serial communications interface. The interface is located within port D of the microprocessor. PDO is the receive data (ARXD) line and

PD1

is the transmit data (ATXD) line. The bi-directional

communication allows the transfer of information, test results, parameters and control

functions to occur between the two processors.

Display Drive Information: Display information to and from the liquid crystal display (LCD) display board RAM is latched via the bi-directional latch (U29). After the information is loaded into the LCD board RAM the display board drives the associated pixels and the audioprocessor is free to perform other tasks. The display area is 240 pixels wide by 64 pixels high.

Monitoring of the Switch Matrix Kevs:

The processor routinely checks the status of

the front panel keys for a change in state. The key panel switch inputs buffers U26,

U27, U28 and U31 are read every 24 msec. processor executes the commands associated with the key function. The (extended range) key and the reflex control keys (Ipsi, Contra, 500,

If a switch change has occurred the

+10dB

1K, 2K,

4K) are

active toggle controls (ie., push on/push off).

Monitoring of the Switch Matrix Keys Continued: The present bar, subject response switch, frequency up/down key, paper advance key,

and page key all function as press and hold controls where the corresponding function is active only as long as the control is pressed. Single action controls include the mode control keys (Prog, Aud, Tymp,

routing keys

(L,R),

memory control keys (Page, M-, M-), and the printer control keys

Tymp/Reflex)

tone type keys (FM, Steady, Pulsed),

(Print Screen, Print All, Paper Advance).

Normal/Calibration

Mode Switch: The slide switch is monitored by the processor thru the switch input buffer U31. It is utilized for entry to the calibration and diagnostic modes.

Switches: Dip switches 1 thru 4 are connected directly to the microprocessor

Dip

A/D convertor. Dip switches 5 thru 8 are connected to the switch input buffer U31. These dip switch selections are read or processed upon entry to the calibration mode. When calibration mode is selected the dip switch status is verified and processed according

to the individual selections. Any change in the dip switch status after entry to the calibration mode will be ignored by the processor.

Hearing

Level Control

(HL):

The hearing level control dial is connected to a 36 position 2 bit encoder (RE1) located on the HL Board. The encoder output from the HL board is connected to port A of the audio processor. In the audiometer mode this rotary knob selects the stimulus hearing level based on the relative position change of

the knob from the previous hearing level selection.

Pure Tone Stimulus

The Audio microprocessor controls the frequency generator for the associated Left

Earphone, Right Earphone, Ipsilateral, or Contralateral outputs. The foundation of the pure tone stimulus generator is a Programmable Timer (U24). Output 0

square wave with a

50/50

duty cycle equal to the selected front panel frequency. Out 1

(SQWIN)

is a

(SCFCLK) is a square wave that is either fifty or one hundred times greater than the front

panel frequency and is used to set the band pass of the switched capacitor filter.

Out 2

is tied back to the micro controller IRQ and is used as an interrupt for the microprocessor

)

so that it can update the COP (computer operating properly The

SQWIN

and minus

signal is a 0 to 5 volt square wave which is level shifted by (U44) to a plus

volt square wave. The signal then passes through an anti

eliminates high frequency harmonics and “rounds” the edges of the sine wave.

circuit.

aliasing filter that

The signal then passes through the switched capacitor filter (U49) which reduces harmonics and other noise. This is the process that produces the clean sine wave product.

Attenuator and +

The attenuator

10dB

Range Extender

(U56)

is a Voltage Controlled Amplifier

(VCA).

This device has amplification gain but most of its dynamic range is used as an attenuator. The total range of the attenuator is 112 dB The output of the 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 output level of the attenuator.

Calibration of the output levels is accomplished by storing a Hearing Level to Sound

Pressure Level value, per frequency and transducer, in a look up table in EEPROM. This information is then latched (U25) to the DAC that drives the attenuator to the appropriate output level. +10 Range Extender may be selected any time that the hearing level is within 1

The resolution or step size is controllable to within a .5 dB increment. The

0dB

of the maximum non-extended hearing level for all frequencies. This selection allows an additional

+10dB

of range above the normal maximum hearing level limit. After the attenuator but before the routing of the signal to the left or right earphone is the 1 0dB gain or attenuator circuit. The control line (+1 ODB) that selects the extended range (U51) is enabled or disabled by the latch

Output Routing

Control

(U20).

The output of the attenuator Amplifier

(U52),

or the lpsi / Probe Tone

(ATTENOUT)

is routed to either the Left amplifier

Speaker Amplifier

(U66).

When contra is selected

(U48)

Right

the output is routed through the right output amplifier and is then switched to the contra phone by the routing relay allows the output to be disabled or shut off to conserve power.

K1.

The output amplifiers have a special control line (pin 1) that

Thispower saving feature

also eliminates any unwanted noise from a non selected output.

unction I Control

The test results are printed using a thermal print head printer on paper that is

112mm

wide. When the print function is selected the processor starts building a graphical bit

mapped image of the printout in the Audio RAM (U32). The printout is formatted as specified by the selections made in the program mode and stored in EEPROM. Before printing takes place the A/D port E of the micro controller measures the ambient

temperature and adds it to the calibrated Dot on time stored in EEPROM. This routine

assures consistent print quality regardless of the ambient temperature or the print head resistance.

The serial print data is transferred from the RAM through port D of the micro controller to

the serial to parallel convertor (U19). The dot drivers (U16

U19

sink the current through the associated print head dot element. Information for the

U17) that are connected to

print head motor driver (U15) and the paper feed motor driver (U14) is received from the micro controller port A. The latch (U13) assures that the print head dot drivers are off

when the print head motor is inactive or when the paper feed motor is advanced. The

printer has a built in switch that is closed when the print head is returned to the home

position.

During the power up initialization and after each print out the print head motor

is returned to the home position. The printer also has independent power supplies used

for the print head

(U38/

+5P)

and the print motors

(U39/

+VM). The +VM power supply

is also connected to the left right routing relay Kl.

The Tymp

Microp

rocessor controls the

following

functions:

Communication to the Audio

transmitted and received using the processors built in serial communications interface. The interface is located within port D of the microprocessor.

line

(TRXD)

communication allows the transfer of information, test results, parameters, and control functions to occur between the two processors.

Pump Drive Control: The a piston, and an infra photo eye/detector pair. After power-up (during the instrument

initialization period) and at the end of a test the pump piston is returned to the home position. The home position (HOME) is determined by a state transition of the infra red photo detector of the pump assembly which is monitored by the Tymp microprocessor (U7) A/D input PE4 (pin 44). The pump motor coils are driven by the motor driver (U37)

which is clocked by the pump drive timer (U21). The timer controls the step rate of the

pump assembly which varies with the pressure sweep rate. The pump sweeps at a rate of 600

to 200

probe is removed from the ear canal. When the probe is removed from the ear canal the pump returns to the home position.

Monitoring

monitored by the Tymp Microprocessor (U7) A/D input PE6 (pin 48). Pressure calibration mode the CMOS Switch pressure transducer circuit so that the input voltage at the gain adjustment places the pressure transducer output at ambient or zero pressure in the

optimum operating range for the A/D convertor. When the ambient gain has been established the processor will set the switches to the stored values at all times. The

pressure span calibration microprocessor as a software offset.

daPa/sec

and

daPa/sec.

of the Pressure Transducer Output ; The pressure Transducer output is

PD1

is the Tymp transmit data line (TTXD). The bidirectional

until the slope of the tympanogram is sensed then the sweep rate slows

If a leak is detected during the pump sweep the pump stops until the

(+200/-400)

Microprocessor; Asynchronous communications data is

PDO is the Tymp receive data

Pump assembly consists of a DC step motor, an air reservoir,

In the Ambient

(U64)

is used to adjust the gain of the

A/D

is equal to 1.5 vdc. This

is controlled by the technician and is stored by the

;

Probe Tone Oscillator (226 Hz) and Speaker Drive

generated by the Microprocessor (U7) Internal Timer System (Port A). This produces a 226 Hz Square wave at PA3 of the Tymp Microprocessor (U7 pin 31). The Square wave

level or gain switches select the appropriate output levels based on controls from the microprocessor.

The output levels or switch settings are determined by the calibration data and the external volume as measured by the probe microphone. The appropriate level is then routed through a 226 Hz band pass filter (U61). The signal is then routed to the Probe Tone / lpsi

speaker amp (U66).

Microphone

ear canal must be filtered to remove as much unwanted signal as possible. This filtering

determined by the CMOS switch settings of (U45 and (U46). These

Input level Monitoring ; The microphone signals that are measured in the

The Probe tone Frequency is

is performed by the 226 Hz band pass filter (U65). The filtered RMS microphone signal

rectified

level adjusted (U59) by the Microprocessor to establish an optimum operating range for

to a dc level for input to the Microprocessor A/D convertor.

This filtered signal

the system during the tymp sweep or reflex testing.

CALIBRATION

EQUIPMENT REQUIRED FOR CALIBRATION

TYPE 1 SOUND 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 (SLOTTED) SCREWDRIVER

SMALL PHILLIPS (CROSS) SCREWDRIVER

CALIBRATION PROCEDURE

CONFIG.

Confiq.

mode of operation and once programmed should never change. If a new microprocessor is installed in location XU7 or programmed. To program the JP1

and JP3 then power up the unit. Almost immediately after power up the unit will display previously installed jumpers. The

DEFAULT DATA LOADING: Durina routine calibration it is not

Default Data.

set of calibration values into EEPROM. Also, if a new microprocessor has been installed the Default Data loads critical power-up information that the processor requires

for operation into EEPROM. When a new microprocessor or

installed Default Data should be loaded. Load Default Data by setting Dip Switch positions 6, 7, and 8 to the “ON” position. Set the

then power up the unit. At power-up the display should indicate the unit model and version number (GSI 38 Version X), the

(Tymp/Reflex

XXX), and the Default Parameters which are currently being loaded into EEPROM

(Loading Audiometer Defautts, Loading Programmed Defautts, or Loading Defaults). When the Default Data Loading sequence is complete the display will update

to the Main Calibration Mode Menu. At this point Dip Switches 6, 7, and 8 should be

returned to their normally OFF position.

Config.

Programming the

Defautt Data Loading

Rev XXX), the Audiometer Software Revision Number (Audiometer Rev

Config.

allows

XU34

the

technician

Cal/Norm

Tymp/Reflex

necessary

its

Config.

to quickly store an

Switch to the Cal Mode,

Software Revision Number

program

necessary

Auto/Tymp

averaged

Board is

Tymp/Reflex

the

load

The technician may also load an individual set of Default Data by first setting the

desired Dip Switch to the ON position then setting the Cal/Norm Switch to the Cal Mode position.Dip Switch assignments are as follows:

Dip Switch

6 7

Function

Tymp/Reflex Audiometer Defaults

Programmed Defaults

Defaults

Location Loaded

Tymp EEPROM Audio EEPROM Audio EEPROM

‘..

NTERING

THE CALIBRATION MODE DIRECTLY (ROUTINE CALIBRATION)

Verify that Dip Switches 6, 7, and 8 are in the OFF position. Power up the unit.

Slide the Cal/Normal Switch to the Cal Mode position. The display should appear as follows:

CALIBRATION MODES

ATTEN

XDUCER

MAX CAL

STIM

CAL

PRINT HEAD CAL

CUSTOM RTL CAL PROBE

TONE/MIC

CAL

COMPLIANCE CAL

PRESSURE CAL

AUDIOMETER CALIBRATION

ATTENUATOR MAXIMUM OUTPUT CALIBRATION: During routine calibration it should not be necessary to calibrate the Attenuator Maximum Output. However, if

Audiometer Default Data has been loaded then the Attenuator Maximum Output must be calibrated.

the

Connect the right phone output unloaded Use the

ATTEN

Press the Present Bar

(The Tone Indicator Use the

the dB HL knob until the output level for currently display frequency is within the

minimum/maximum values listed in the following table. When the desired output level has been reached store the value by pressing the pi Key. Repeat all frequencies.

!=I

MAX CAL

Frequencv

125 250 500

750 1000 1500

2000 3000 4000 6000 8000

[c]

Keys to position the cursor on the 38 display at the

position.

Key

to enter the

to lock on the tone.

should now be present on the display.

to select the desired frequency for calibration.

(Hz)

an RMS Meter.

ATTEN

MAX CAL Mode.

Minimum - Maximum

2.05-2.30

2.33

2.5

1.69-1.9

2.28-2.5 vrms

2.28 -

2.55 -

2.28 -

2.55 -

2.28-2.50

2.28 -

2.5

2.70

2.50 vrms

2.70 vrms

2.50 vrms

vrms vrms vrms

vrms

vrms vrrns

vrms

Adjust

for

After all frequencies have been calibrated press the Calibration Mode Menu.

Key to the Main

AUDIOMETER

Use

the a IHz[m IKeys

STIM CAL.

SPL OUTPUT LEVEL CALIBRATION

to position

the cursor on the

display at XDUCER

Press

the

I=]

Key to

enter the XDUCER

STIM

CAL

MODE.

The display should now indicate:

XDUCER

STIM

CAL

40.0 125

NOTE: Tone Bar is OFF or Inactive

40.0

125 Hz

Indicates the Current Hearing Level (HL) selected. Indicates the Current Frequency (Hz) selected. Indicates the Current Transducer selected. Indicates a Steady Tone Presentation

The Tone Bar is active in this mode and serves a dual function. When the Tone Bar

is OFF or inactive the current hearing level is displayed When the Tone Bar is pressed ON or active the stim on indicator

the display and the 40.0

(HL) indicator will update

shown above.

will appear on

the ANSI Standard Reference

Threshold Level (RTL) measured in Sound Pressure Level (SPL) for the selected

frequency and hearing level.

Example:

40.0 dB (HL) at 125 Hz (Freq) will update to 85.0 dB SPL when the Tone Bar is depressed.

Given:

Therefore:

The ANSI Standard (RTL) correction value for 125 Hz at 0 HL is

equal to 45.0 At 40 dB HL which

125

will equal 85.0 dB SPL.

SPL.

For 125 Hz

ANSI Standard RTL for 0 dB HL

(+)40

dB HL

40 dB SPL higher that 0 dB HL the output for

45.0 dB SPL

(+)40.0 dB

85.0 dB SPL

SPL

For 8

KHz

When calibrating using a Sound Level Meter (SLM) it is important to add or subtract the

appropriate microphone correction.

manufacturer or calibration facility should supply the microphone’s frequency response curve. response by using a piston phone or similar standard device. Below is an example of a microphone frequency response curve.

MICROPHONE

CALIBRATION

ANSI Standard RTL for 0. dB HL

(+)60 dB

60.

= = =

13.0 dB SPL

(+)

60.0 dB SPL

73.0 dB SPL

When the microphones are calibrated the

The microphone is then calibrated to the SLM which has a flat frequency

CHART

-1

-5

Provo,

Utah

-10

. .._,..., .q , , ,

-15

20 Hz 50 1DO

.,-_i..,

! I. ._ ! i, _

.I 11 1

._,‘_.,.., 1,. __, _,._ ,

200 ' 500

10K

--1-\I--s’

20K

50K

The curve shows that the microphone response is flat between 20 Hz and 1.5 KHz,

KHz

high between 2

an example when a standard force is applied to the surface of this microphone its

output is 1

1 dB to our expected value. Our formula for determining the proper calibration

add

high. Therefore, when calibrating 4

and 6

KHz,

and low at frequencies 8 KHz or greater. Using 4 KHz

KHz

using this microphone we must

level for 4 KHz is as follows:

100k'

200K

. 41

KHz

ANSI Standard RTL for

Reference HL for Calibration

(+)80. dB

(+) or (-) Microphone Correction

0. dB HL

NA.

80.

(+)80.0 dB

(+)

9.5 dB SPL SPL

1.0 dB SPL

90.5 dB SPL

The following table contains the ANSI Standard Reference Threshold Levels

RTL's

0 HL for each frequency when using TDH-39P earphones.

Frequency (Hz)

ANSI Standardd

Measured

in dB SPL

RTL

125

45.0 25.5

Standard Reference Threshold Levels re:

250

11.5

500 750 1000 1500

7.5

20pPa

7.0 6.5

for

Telephonics

2000 3000

9.0

10.0

TDH-39P earphones

4000

0.5

as measured on the National Bureau of Standards 9-A coupler. Reference ANSI S3.6

6000 8000

15.5 13.0

1989, ISO 389 - 1975 Standards.

Grason-Stadler has made an effort to minimize calibration time by defaulting the Reference HL Levels for Calibration to maintain an expected SPL Calibration Level of between 85 and 95 dB SPL. The Default HL Levels are as follows:

Frequency

Default HL

(Hz)

125 250 500 750 1000 1500

60 80 80 80 80

2000 3000

80 80 80 80 60

4000

6000

8000

Because the 38 automatically adds the ANSI RTL and reference HL values on the display (when the Tone Bar, is active) the technician needs only to add or subtract the appropriate microphone correction to the displayed value when calibrating.

Connect the right ear phone to the Sound Level Meter Artificial Ear.

Press (TONE BAR\ the display will update from the selected hearing level to the ANSI Standard RTL value for calibration and the appear).

indicator will

Adjust the HL knob until the SPL Level measured on the SLM for the selected frequency and transducer equals the value indicated on the 38 display (+ or

’

Microphone Correction).

Press

Repeat for all frequencies, right phone, left phone, ipsi and contra by

theIF

Key to store the data in memory.

selecting the appropriate key on the 38 front panel.

NOTE: Both left phone and right phone must be calibrated.

When finished press the

Menu.

Key to return to the Main Calibration Mode

CUSTOM RTL CAL This mode is used primarily if a customer wants to calibrate using transducers other

than TDH-39P earphones. This mode allows the technician to program different

RTL values to be displayed when calibrating using the XDUCER Once programmed, the Custom RTL values will be displayed each time the

XDUCER

63.5

Audiometry Mode is selected to indicate to the customer that Custom RTL values

have been programmed. To return to the ANSI Standard Values and extinguish the

sign, the technician must load Audiometry Default Calibration Data.

STIM

CAL MODE is entered. The range of allowable

A # sign will appear next to the dB HL indicator on the display when

Use

theF]Hz]=]Keys

display.

to position the cursor at Custom RTL Cal on the

STIM

CAL MODE.

RTL's

is -5 dB to

7) NOTE:

PROBE

Press the

Press Adjust the dB HL dial to achieve the desired RTL value. Store the value into memory by pressing the m Key.

Repeat for all desired frequencies.

Press

Use

Mode

IFZF]

thewlHz[c]Keys

the

]w]

Adjusting the Custom RTL values has no effect on the earphone output level. After storing the Custom must calibrate to the appropriate levels using the XDUCER CAL MODE.

TONE/MIC

theI=] HzF]Key

position.

CAL

Key to enter the Custom RTL Cal Mode.

to select the desired frequency.

Key to return to the Main Calibration Menu.

RTL's

to position the cursor at the Probe

the technician

Tone/Mic

STIM

Cal

Press the ) PROG 1 Key to enter Probe Tone/Mic Cal Mode. The display will

update to the following “flashing” display.

PROBE

ECV

At this point place the probe in the 2 cc coupler on the Sound Level Meter.

TONE/MIC

SLM

CAL 1.1

Press the

Key and the display will stop flashing.

Use the dB HL dial to adjust the Probe Tone Level to 85.5 dB SPL dB).

At this point the Probe Tone

226 Hz Press the

(+/-

6 Hz).

LM+f

Key to store the data in memory. The display will update to

Frequency

may be verified. It should equal

the following ‘Washing” display.

j:l’:,‘““““*“‘I

At this

Press the

point

place the probe in the 2 cc test cavity.

Key to start the microphone calibration process. The display

will update to the following steady state display.

**I

(+/-

0.9

After a few seconds the SAVED indicator will extinguish and the 1.2 will change to 1.3. When the cycle is complete the display following “flashing” display.

Press the

COMPLIANCE CAL

Use the

Mode position.

Press the

[=I

update to the following “flashing” display.

will update to the

Key to return to the Main Calibration Mode Menu.

LqKeys

to position the cursor

Key to enter the Compliance

at the Compliance Cal

Cal Model The display will

indicator

COMPLIANCE CAL 2.1 ECV 0.5

Place the probe into the 0.5 cc calibration cavity then press the

[M+I

Key to start the 0.5 cc calibration. The display will stop flashing and remain in steady state to indicate that calibration is in progress.

NOTE: If the wrong cavity size is used the display will indicate E74 in the lower right hand corner. After approximately 5 seconds the ERROR MESSAGE will extinguish and the calibration process may be continued by placing the probe into 0.5 cc cavity and then pressing the

[WI

Key.

When the 0.5 cc calibration is complete the display will update to the following

“flashing” display.

COMPLIANCE CAL 2.2

ECV 2.0

At this point place the probe into the 2.0 cc test cavity.

Press the

Key to start the 2.0 cc calibration. The display will stop flashing

and remain in steady state to indicate that calibration is in progress.

NOTE: If the wrong cavity size is used the display will indicate E74 in the lower right hand corner.

After approximately 5 seconds the ERROR

MESSAGE

extinguish and the calibration process may be continued by placing the probe

into the 2.0 cc cavity and then pressing the

Key.

When the 2.0 cc calibration process is complete the display will update to the following steady state display.

COMPLIANCE CAL 2.3

ECV 2.0 cm3

X.XX

is equal to the current volume measurement.

The calibration of compliance measuring devices is affected by air density. As the air gets thinner, the volume measurement in a

hardwall

cavity increases.

Therefore, as you go up in altitude, barometric pressure decreases making the

hardwall

cavity appear larger than it is.The GSI 38 allows the flexibility to

display the real altitude effect or to correct the ear canal measurements relative

to sea level.

If the customer prefers to correct the ear canal volumes relative to sea level then adjust

2.00 After adjusting to the desired level store the value by pressing

the

compliance calibration process is complete.

If the customer prefers uncorrected ear canal volumes (actual at altitude

measurements) then adjust the value indicates the appropriate volume measurement for the customer site elevation according to the following altitude table.

Altitude

(ft)

500

1000

1500 2000 2500

3000

3500 4000 4500

5000

5500

6000

6500

7000

7500

8000

8500

9000

9500

10000

Barometric Pressure

(mm

thep]HzlF]

Keys until the cm3 XXX value equals

Key. The display will start “flashing” indicating that the

i-1

[Fj

Keys until the cm’ XXX

Expected Volume Reading

Hg)

759.97

746.51

733.04

719.84

706.63

693.93

681.23

668.78

656.34

644.40

632.46

620.78

609.09

598.00

588.00

578.00

568.00

555.00

544.00

533.00

522.00

at Altitude (cc)

2.00

2.01

2.03

2.05

2.07

2.09

2.11

2.13

2.15

2.17

2.20

2.22

2.25

2.27

2.30

2.34

2.37 2.4~0.1

2.40

2.44

2.49 2.520.1

2.54

Calibration Volume

Altitude

(cc)

2.0

2.020.1

2.120.1

2.2zo.q

2.220.1

2.3~O.q

2.3~0.1

2.320.1

2.4~0.1

2.520.1

Press the

]M+j

Key to store the customer altitude volume measurement. The display will start “flashing” indicating that the Compliance Calibration process is complete.

Press the

Key to return to the Main Calibration Mode Menu.

PRESSURE CAL

Use the Press the

update to the following “flashing” display.

At this point make sure that the probe tip is in open air.

Press Pressure Calibration is complete the display will update to the following “flashing”

display.

[~~Hz~~~

I-1

M+ 1 Key to start the Ambient Pressure Calibration.

Keys to position the

Key

to enter the Pressure

‘PRESSURE CAL

ECV OPEN A/D daPa

cursorr

at the Pressure Cal position.

Cal Mode. The display will

3.1

When the

Ambient

PRESSURE ECV MANOMETER A/D

XXXX

daPa

-200

CAL

3.2

At this point connect the probe tip to a manometer.

NOTE: Manometer internal volume must be less than 5 cc’s. Press the Use the

to -200

Press the saved will appear in the lower right hand corner of the display. After 3 to 5 seconds the saved indicator will be extinguished and the display will update to

a steady state display as follows. At this point verify that the leak rate is less than 2

Press the

manometer reading is within &15%) of the pressure value indicated on the 38

display.

Press the

-1

IzIHz daPa &15%)

1-1

Ver

/=I

Key. At this point the pump will pressurize to -200

[=I

Key to store the -200

Key and the 38 will pressurize to +200

Key to return to the Main Calibration Mode Menu.

daPa

Keys to adjust the pressure on the external manometer

daPa

Calibration data. The messages

daPa/sec:

daPa.

PRINT HEAD CAL

Use the Press Press the

1x1 HzLG]

the

-1 [=I

Keys to move the cursor at the Print Head Cal position.

Key to enter the Print Head Cal Mode.

Hz to lighten

the

printout and the

[=I

Hz Key to darken the printout. When either key is pressed the printer will print a test pattern (the alphabet) on a single line. When the center of the adjustment range is crossed

the In Range indicator on the display will appear (when adjusting from a light

intensity to a dark intensity) or extinguish (when adjusting from a dark intensity

to a light intensity).

EXAMPLE TOTAL RANGE

OF PRINT INTENSITY ADJUST RANGE.

20 STEPS OR 20 DIFFERENT INTENSITY LEVELS.

ABCDEFGHIJKLMNOPQRSTUVWXYZ: ABCDEFGHIJKLMNOPQRSTUVWXYZ:

ABCDEFGHIJKLMNOPQRSTUVWXYZ:

ABCDEFGHIJKLMNOPQRSTUVWXYZ: ABCDEFGHIJKLMNOPQRSTUVWXYZ: ABCDEFGHIJKLMNOPQRSTUVWXYZ: ABCDEFGHIJKLRNOPQRSTUVWXYZ: ABCDEFGHIJKLRNOPQRSTUVWXYZ:

ABCDEFGHIJKLMNOPQRSTUVWXYZ: ABCDEFGHIJKLMNOPQRSTUVWXYZ:

l ABCDEFGHIJKLNNOPQRSTUVWXYZ: l ABCDEFGHIJKLMNOPQRSTUVWXYZ: l ABCDEFGHIJKLMHOPQRSTUVWXYZ:

ABCDEFGHIJKLMNOPQRSTUVWXYZ;

l ABCDEFGHIJKLMNOPQRSTUVWXYZ:

lABCDEFGHIJKLMNOPQRSTUVWXYZ:

l ABCDEFGHIJKLMNOPQRSTUVWXYZ:

l “In Range” indicated on display.

Press Press the Slide the Cal/Norm Switch to Norm to return to Normal Mode Operation.

the[F]

1-1

Key to store the desired intensity value.

Key to return to the Main Cal Mode Menu.

. 48

S4 DIP SWITCHES.

S1 S2 S3 S4 _

S5 S6 S7 S8

Unused

Factory Auto

To Be Defined

Tymp/Reflex Default Data

Audiometer

Program Default Data

Cal

Default

Data

Unused

Norma! Cal Mode Operation Normal Cal Mode Operation Normal Cal Mode Operation Normal Cal Mode Operation Normal Cal Mode Operation Normal Cal Mode Operation Normal Cal Mode Operationon

OFF

TROUBLE SHOOTING

ERROR MESSAGES (EXX)

NOTE: If an Error Message is observed the associated code number should be recorded for future reference.

specific block of circuitry which will enable the technician to repair the problem in a fast, efficient manner. Most software errors are related to poor environmental conditions such

as static electricity and power line interference and will generally clear with power down/up. Contact your local sales and service organization and supply them with the Error Code Number if the error will not clear with power down/up.

AUDIOMETER PROCESSOR RELATED MESSAGES

The Error Code Number is designed to point to a

Code Number

EPROM Checksum Error on power up / if

Description/Possible

non-recoverable possible defective Board EPROM

Microprocessor Internal RAM Error on power up / if nonrecoverable replace Microprocessor U34.

Watch Dog Timer Timeout / the Watch Dog Timer Circuit monitors the Microprocessor’s operation. The Processor must periodically send an “I’m Okay” message ‘to the watch dog or the watch dog will halt all operations. If nonrecoverable try replacing.

Audiomymp Board.

Microprocessor defective crystal Y2 or Microprocessor U34.

Undefined Interrupt Error / this type of soft error should always be recoverable. Processor does not acknowledge or cannot execute. If nonrecoverable replace Audiomymp Board.

U30

Clock Failure / if non-recoverable possible

Cause

Auto/Tymp

or Microprocessor U34.

Microprocessor U34 or

relates to an Interrupt that the

Opcode Trap Interrupt Error /this type of error code should always be recoverable. Microprocessor

External Audio RAM U32 or Microprocessor

Normal or Swap Stack should always be recoverable. Audio/Tymp Board.

RAM

U34

or Audiomymp Board.

Error / if non-recoverable possible defective

Overflow

If non-recoverable replace

U34.

into the Global Variables

non-recoverable replace

Code Number

Description/Probable Cause

'12

‘13

'14 '15

Conf. Register Error / if non-recoverable re-calibrate

Config,

if non-recoverable possible defective Audio/Tymp Communications Chip U36 or Microprocessor

Invalid

Keycode

U34.

detected in CMDTSK / if non-recoverable

possible defective Switch Panel, Switch Buffer U26, U27, or

U28, or Microprocessor U34. Invalid Invalid

Keysource detected in CMDTSK

Queue Power

Error detected in CMDTSK /same as

same as above.

above. Bad Pointer to EEPROM Routine’/

Collision of the Normal Stack and Swap

Stack

‘16

‘17

'18 '19 ‘20 ‘21 22

Invalid function for a Banded Swapped Function Printer RAM Error on power up / internal or micro

Tymp Hardware State is unknown

Non-Fatal Audiometer related error messages Calibration Data Read Error HL Limit exceeded /

Invalid Extended Range Selection due to HL not in range

where the Extend Range is valid 23 24

Calibration Data Write Error occurred Invalid Present Bar Operation due to a

Calibration Data Error /

occured /

Code Number

Description/Probable Cause

Remote Record received with a Bad Record Format, invalid Key Code, or Invalid Record Type

27 28

EEPROM Checksum Error EPROM TO EEPROM Data Load Error Remote Command received from an external remote device

(factory auto unsupported record type

Remote command received from an external remote device (factory auto cal) which 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

cal)

which is invalid due to mode or is an

Tymp/Reflex

the Audio Processor or the

setting the Synch

No Free Memory available when going to a new test

Processor not responding to a command from

Tymp/Reflex

Processor is not

Stimo line on power up /

/ Invalid test type read from memory when trying to display Print Head initialization failed / Printer Ambient temperature out of Range Record was received from the

Tymp/Reflex

Processor which

has a valid format but the record type was not the type

expected

Call Factory for instruction

Audiometry mode not enabled

TYMP

PROCESSOR RELATED MESSAGES

Code Number

51 52 53

55 56 57 58 59 60

Description/Probable Cause EPROM Checksum Error on power up Internal RAM Error on power up Watch Dog Timer Time Out CPU Clock Failure

Undefined Interrupt Error

/ Opcode Trap Interrupt Error External RAM Error Stack Overflow Error Config.

Bad Pointer to EEPROM Routine

62 63-69

70 71

EEPROM Read Error in Norm or Couldn’t Home Pump

Alt

Mode

Undefined Non Fatal Errors

Probe is occluded or in cavity at power up

Probe not in 2.0 mL cavity during Altitude Adjustment Cal Mode

End of gain reached in Microphone Cal Mode

Probe Tone Gain Error during Probe Tone Gain Verification

Cavity Error during Calibration / Compliance Calibration Error /

Unused

Code Number

Description/Probable Cause

A/D

Pressure Value out of range of Pressure Transducer

Gain

Error /

79 80

Remote Record Error Non-Fatal Cal Data

Reflex Test time /

81 82 83 84

Remote Command invalid for the mode Leak or Occlusion Error Pump end of stroke Undefined Error Number Reported /

Read/Write

info

not received for the Audio within the allotted

Error

DISASSEMBLY

CAUTION STATIC SENSITIVE DEVICES/USE STATIC PROTECTION

DISASSEMBLY

OPENING CASE

TO GAIN ACCESS TO INTERNAL

UNDER FRONT EDGE OF UNIT AS SHOWN IN STABILIZE REMOVING SCREWS

TO REMOVE PROBE

DISCONNECT REAR PANEL POWER CONNECTOR. OPEN CASE. DISCONNECT AUDIO/TYMP BOARD CONNECTORS PUMP PNEUMATIC

REMOVE CABLE CLAMP SCREW DETAIL VIEW “A”. GENTLY LIFT THE CABLE STRAIN RELIEF OUT OF THE PANEL.

TO REMOVE HL BOARD ASSEMBLY

DISCONNECT REAR PANEL POWER CONNECTOR. REMOVE HL KNOB AND THE HL SWITCH MOUNTING HARDWARE (7116” HEX NUT REMOVE SCREW MARKED

TOP CASE.

TO REMOVE DISCONNECT ALL REAR PANEL CONNECTORS OPEN CASE. DISCONNECT

CONNECTORS "B"

AS SHOWN IN

CASE.

UNIT

AND LOCATE COMPONENTS IF UNIT IS PLACED ON LER SIDE PRIOR TO

AND

OPENING CASE.

AND SHIELD 1. DISCONNECT THE PNEUMATIC TUBING FROM THE

FITTING

AUDIO/TYMP

THRU J8 AND SHIELD 1

DRAWING

BY GENTLY PULLING ON TUBING NEAR THE PNEUMATIC FITTING.

BOARD

COMPONENTS.

MARKED"C"

WASHER) AS SHOWN IN DRAWING 2. OPEN CASE.

"D" AS

SHOWN IN DRAWING 1. GENTLY

(ie

1. PULL BOARD CAREFULLY FORWARD THEN UP AND OUT OF

REMOVE DRAWING 1.

AS SHOWN IN

ALL). LOOSEN OR REMOVE 2 SCREWS MARKED

2 SCREWS

NOTE: IT MAY BE EASIER TO

DRAWING 1

MARKED “A” LOCATED

AND ENLARGED

BOTTOM

LIFT

BOARD AWAY FROM

AUTO/TYMP

CASE SIDE

BOARD

TO REMOVE TIP-UP FEET

DISCONNECT REAR PANEL POWER CONNECTOR. OPEN CASE. REMOVE SCREWS MARKED

"E"

AS SHOWN IN DRAWING 1 AND DRAWING 2.

SWITCH PANEL REMOVAL DISCONNECT REAR PANEL POWER CONNECTOR. REMOVE HL KNOB. OPEN CASE.

DISCONNECT AUDIO/TYMP BOARD CONNECTOR WHICH SECURES THE SWITCH PANEL CABLE BY GRASPING FIRMLY AND GENTLY PULLING AWAY FROM THE ADHESIVE BACKING. START LIFTING THE SWITCH PANEL BY INSERTING A SMALL KNIFE

BLADE BETWEEN THE SWITCH PANEL AND TOP CASE AT ANY CORNER. ONCE A CORNER

IS LIFTED GRASP THE PANEL FIRMLY AND GENTLY PEEL AWAY FROM THE TOP CASE. PRINTER REMOVAL

TOP COVER.

THE SWITCH PANEL IS SECURED TO THE TOP COVER BY

J4.

REMOVE THE ADHESIVE CABLE CLAMP

DISCONNECT ALL REAR PANEL CONNECTORS. OPEN CASE. REMOVE

DISCONNECT J1 AND J2 FROM PRINTER CONNECTOR BOARD. REMOVE PAPER COVER.

REMOVE 2 SCREWS MARKED

REMOVE PRINTER BY LIFTING REAR OF PRINTER ABOVE THE 2 REAR HOLDING PINS OF

CASE, THEN SLIDE PRINTER TOWARDS THE REAR UNTIL THE PRINTER IS CLEAR OF THE 2

FRONT HOLDING PINS. ONCE CLEAR OF THE HOLDING PINS

PRINTER CONNECTOR BOARD REMOVAL

DISCONNECT ALL REAR PANEL CONNECTORS. OPEN CASE. REMOVE AUDIO/TYMP BOARD.

DISCONNECT Jl & J2 FROM PRINTER CONNECTOR BOARD. REMOVE SCREW MARKED

AS SHOWN IN

LCD REMOVAL

DISCONNECT ALL REAR PANEL CONNECTORS. OPEN CASE. REMOVE

REMOVE 4 SCREWS MARKED .250

INCHES LONG. INSTALLING LONGER SCREWS WILL CAUSE SCREWS TO PROTRUDE

THROUGH FRONT PANEL!). PUMP REMOVAL

DISCONNECT REAR PANEL POWER CONNECTOR. OPEN CASE. DISCONNECT J7 AUDIO/TYMP BOARD. DISCONNECT PNEUMATIC TUBING FROM PUMP FITTING. REMOVE 4

SCREWS MARKED SCREWS WILL BE EASIER IF

PRESSURE WHILE LIFTING PUMP FROM CASE TO ALLOW PUMP TO CLEAR SHOCK MOUNT

STANDOFFS.

DRAWING 3.

"K"

AS SHOWN IN DRAWING 3 AND DRAWING 5. NOTE: ACCESS TO PUMP

"F"

AS SHOWN IN

"H"

AS SHOWN IN DRAWING 3. (NOTE: THESE SCREWS ARE

BOTTOM

CASE IS REMOVED. APPLY SLIGHT REARWARD

DRAWING

4. REMOVE PRINTER COVER.

LIFT

AUDIO/TYMP

PRINTER OUT OF CASE.

AUDIO/TYMP

BOARD.

& J8

FROM

"G"

BOTTOM CASE REMOVAL

DISCONNECT REAR PANEL POWER CONNECTOR. OPEN CASE. LOOSEN 4 SCREWS MARKED

"L"

AS SHOWN IN DRAWING 1 BY APPROXIMATELY 3 TURNS. THIS SHOULD ALLOW

SUFFICIENT CLEARANCE TO SLIDE

AND THE HINGE BLOCKS.

BOTTOM

CASE PINS

FROM BETWEEN THE TOP COVER

INSTRUMENT ASSEMBLY PARTS LIST

DESCRIPTION INSTRUMENT ASSEMBLY, GSI 38

CONSISTING OF:

LABEL SET, CASE, BOTTOM KNOB, CONTROL GOUND PLANE, ESD PROTECT PRINTER,

SWITCH PANEL,

LABEL, JACK PANEL ASSEMBLY, CASE, TOP ASSEMBLY, LIQUID CRYSTAL DISPLAY ASSEMBLY, PROBE 1738-3200 ASSEMBLY, PUMP . ASSEMBLY, AUDIO/TYMP BD. ASSEMBLY, PRINTER CONNECTOR BD. ASSEMBLY, H.L. BD. LENS, DISPLAY 1738-7002 COVER, PAPER 1738-7020 SUPPORT, PUMP COVER, CALIBRATION 1738-7042

BLOCK,

PANEL, POWER, BLANK 1738-7060 PANEL, POWER 1738-7065 COVER, PRINTER CLAMP, CABLE, FIAT, ADHESIVE CLAMP, INSULATING, RETAINER, KNOB FOOT, ADHESIVE, BLACK 5260-2250 SHOCK MOUNT, MALE-FEMALE GROMMET 5680-l 001 SCREW, LOCKING, STANDOFF, M/F 7574-0050 FOOT, NUT, LOCKING, #6-32 SCREW, PAN HD., SCREW, LOCKING,

GSI

112mm,

HINGE

P-UP 5260-3800

HIGH SPEED

GSI

.25

NOM. I.D.

#6-32

.375

LG.

36-32

.500

LG.

#6-32

.250

LG.

PART NUMBER

1738-3100 1738-0480

1717-7001 1717-7006 1738-042 1 1738-0430 1738-0435 1738-0440 1738-1005 1738-l 010

1738-3210 1738-4705 1738-4710

1738-4715

1738-704 1

1738-7055

1738-7080 4314-0009 4320-0300 5220-0101

5680-0305 7044-0037

5814-0003 7044-1203 7044-0024

AUDIO/TYMP

BOARD

ASSEMBLY DRAWINGS/SCHEMATICS

AUDIO/TYMP

BOARD PARTS LIST

DESIGNATION

INTEGRATED CIRCUITS U1

U3 U4 U5 U6 U7 U8 U9 U10 U11 U12 U13 U14 U15 U16 U17 U18 U19 U20 U21 U22 U23 U24 U25

,,-‘- U26-U28

U29 U30 U31 U32 U33

U34

U35

U36

‘i

U37

U38

U39

DESCRIPTION

IC,

SMT, 74 HC 4075, 3 INPUT OR

IC,

SMT, 74 HCOO, QUAD 2 IC, SMT, 74 HC02, QUAD 2 INPUT NOR IC,

SMT, MC 34064, UNDER VOLTAGE SENSOR IC, SMT, MC 14053, IC, SMT, IC,

SMT, EPROM, PROGRAMMED IC, SMT, 6264, 8K X 8 STATIC RAM IC, SMT, 74 HC 373, 3 STATE OCTAL LATCH IC, SMT, 74 HC 273, OCTAL D FLIP-FLOP SEE Ull IC, SMT 74 HC 4538, DUAL MULTIVIBRATOR IC, MC 3479, STEP MOTOR DRIVER SEE U14 IC, SN 754377, QUAD PERIPHERAL DRIVER SEE U16 SEE U2

IC,

SMT, 74 HC 595, 8 BIT I/O SHIFT REG. SEE IC, MC 6840, PROGRAMMABLE TIMER IC, SMT, 74 HC 10, 3 INPUT NAND SEE IC, SMT, 82 C 54, PROGRAMMABLE SEE Ull IC, SMT, 74 HC 541, OCTAL BUFFER/DRIVER IC, SMT, 74 HC 245, 3 STATE BUS X-CIEVER EPROM PROGRAMMED SEE U26 - U28 IC,

SMT, MS 62256, IC, SMT, CMOSPAL, PROGRAMMED SEE U7 IC,

SMT, LT 1054, VOLTAGE SEE U5 SEE U14 IC, MC 7805, IC,

74HCC138,

68HC11E1,

U11

U10

+5V

317, REGULATOR

TR1-2

1 OF 8

8 BIT MICRO

32KX8,

REG

INPUT

NAND

MUX/DEMUX

DECODE/DEMUX

TIMER

STATIC RAM

CONV/REG

PART

5905-4075 5905-0000 5905-0002

59334064

5904-4053 5905-0138

1738-0510 5904-6264 5905-0373 5905-0273

5905-4538

5431-9697 5431-9697

5909-0595 5431-9018

5905-0010

5929-8254

5905-054 5905-0245

1738-0505

5904-2256

1738-0515

5908-l 054

5432-l 066

5432-l 024

NUMBER

DESIGNATION DESCRIPTION

PART NUMBER

INTEGRATED CIRCUITS CONTINUED... U40

U41 U43 U44

SEE U38

IC, SMT, MC

79L05,

-5V REG

IC, SMT, TL072, JFET OP AMP

IC, SMT,

LT1013,

DUAL OP AMP U45 IC, SMT, 140518, ANALOG MULTI PLXR U46

U47 U48 U49 U50 - U51 U52 U53 U54 U55 U56 U57 U58

U59

U60 U61 - U62 U63 - U64 U65 U66 U67 U68 U69

SEE U45

SEE U5

IC, SMT, MC 34119, LOW POWER AUD. AMP

IC, SMT,

LTC1060CS,

SWITCHED CAP FILTER

SEE U5

SEE U48

IC, SMT, AD7524, 8 BIT D/A CONVERTER SEE U5 IC, SMT, IC,

SEE IC,

SMT. AD736.

SEE

SR25D, 2.5V

DBX2150,

VC AMP

U44

U45

REF

RMS/DC

CONVERTER

SEE U44 SEE U43 SEE U5 SEE U43 SEE U48 SEE U43 SEE U5

SEE U44

5908-7905

5909-0072 5909-1013

5904-4051

5904-4 119 5904-l 060

5907-7524 5933-0025

5432-l 092 5907-0736

DIODES CR1 - CR3 DIODE, SMT,

CR4 CR5 - CR6

DIODE, SEE CR1

MMB0914L

ZENER, 1N759A,

CR3

RESISTORS & POTENTIOMETERS Rl RES, SMT, 1K, 1%,

R2 R3 R4 - R5 R6 R7 R8 R9 R10 Rll - R13 R14 R15

RES, SMT, RES, SMT, 249 OHM, RES, SMT, 26.1K, 1%, RES, SMT, RES, SMT, 750 OHM, 1%, SEE R2 SEE R6 RES, SMT, RES, SMT, RES, SMT, 130 OHM, 1%, SEE

R10

47.5K,

20K,

1%,

2M, 1%, .12W

10.2K,

.12W

1%,

.12W 1%, .12W

.12W

1%, 12W

12v

.12W

6082-2002 6083-1014

6650-l 100 6650-2475 6650-0249 6650-2261 6650-2200 6650-0750

6650-4200 6650-2102

6650-0130

DESIGNATION

DESCRIPTION

RESISTORS 8 POTENTIOMETERS

PART NUMBER

R16

R17 R18 R19 R20 R21 - R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 - R38

R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54

R55 R56 R57

R58 - R59 R60 - R61 R62 - R63 R64 R65 R66 R67 R68 R69

THERMISTOR,

SEE

SEE Rll

R13

10K, 10%, 4.41%/C

SEE Rl

SEE

R11 -

R13

SEE

R1 SEE R22 SEE

RES, SMT,

SEE

RES, SMT,

24.9K,

64.9K,

1%, 1%,

.12W

.12W SEE R6 SEE R27

THERMISTOR, SMT,

RES, SMT,

23.2K,

18,

100K,

.12W

10%

SEE R7 SEE R2 RES, SMT, RES, SMT, SEE

R11 -

2.49K,

61.9K,

R13

1%, 1%,

.12W

.12W SEE R6

RES, SMT,

SEE

R11 -

RES, FILM, 332 OHM,

2.05K,

R13

1%,

.12W

1%, .25W SEE R3 RES, SMT,

102K,

1%,

.12W

SEE R43

RES, SMT,

6.19K,

1%,

.12W

‘SEE R35

SEE R45 SEE R43

SEE R3

SEE R43 SEE R35 SEE R43 SEE Rll - R13 RES, SMT,

191K,

1%,

.12W SEE R6 SEE

R1 SEE R43 SEE

R11 -

R13 SEE Rl SEE R14 RES, SMT, 20 OHMS,

1%, .12W SEE Rll - R13 SEE R34 SEE R39 RES, WW, TEMP. SENS, l.lK 3600 PPM, 5% SEE R6

6740-l 302

6650-2249 6650-2649

6740-l 350 6650-2232

6650-1249 6650-2619

6650-l 205 6350-0332 6650-3102 6650-1619

6650-3191

6650-9200

6700-0002

DESIGNATION

RESISTORS 8 POTENTIOMETERS R70 SEE R14

R72 R73

R74 R75 - R76 R77 R78 R79 - R81 R82 R83 SEE R14 R84 R85 R86 R87 SEE R74 R88 R89 R90 R91 R92 R93 R94 R95

R96 SEE R4 R97 R98 R99 R100 R101 - R102 R103 R104 - R105 R106 R107 R108 R109 R110 Rlll Rl12 R115 R116 SEE R7 R150 R151 R200 R201

R202

DESCRIPTION

POT, CER MET, 1K OHM, POT, CER MET, 50 K, RES, SMT, SEE R14 SEE R43 SEE Rll - R13 SEE R6 SEE R39

SEE

R25 SEE R43 SEE R34

SEE R43

RES, SMT, SEE R43 SEE R34 SEE R25 SEE R2 SEE R35 SEE R34

SEE R39

SEE R85 SEE R2

RES, SMT,

SEE R74

‘SEE R6

SEE R74 SEE

R11 -

RES, SMT, 13.3 OHMS,

SEE

R107

RES, SMT,

SEE R25 SEE R43 SEE R64 SEE Rl

POT, CER MET, SEE

R1 SEE R7 SEE Rll - R13 SEE R34

40.2K,

15.4K,

8.25,

R13

150K,

1%,

.12W

1%,

.12W

10K, +/-

+/-

10%

.12W

1%, .12W

20%

10%

PART NUMBER

6049-0500

6049-0350

6650-2402

6650-2154

6650-l 825

6650-9133

6650-3150

6049-0386

DESIGNATION

CAPACITORS

DESCRIPTION

PART NUMBER

Cl C2 C4 C5

C7 - C8 C9 Cl0 C11 Cl2 Cl3 Cl4 Cl5 Cl6 Cl7

C24 C25 C27 C28 C29 C30

C35 C36 C37 C39

C40

C41

C42-C46 C47 C48-C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 - C59 C60 C61 C62 C63 C64 C65 C66 C67 - C69 C70 C71

c73 C74 C75 - C76 C77 C78 - C79

CAP, ELECT, CAP, SMT, CER, 01uF, 10%, 50V SEE C2 CAP, SMT, CER, SEE C2 CAP, SMT, TANT, SEE C2 SEE C5 SEE C2 CAP, SMT, CER SEE Cl3

SEE C2 CAP, SMT, CER, .01uF, 10%, 50V

SEE C2

SEE C2 CAP, SMT, CER, CAP, TANT, SEE Cl3 CAP, SMT, TANT, SEE C2 SEE

C9 SEE C2 CAP, SMT, TANT, SEE C2

SEE C50

SEE C25 SEE

C50 SEE C37 SEE C2 SEE C37 SEE C2 CAP ELECT, SEE C2 CAP, SMT, TANT, SEE C2 SEE

C50 CAP, SMT, TANT, SEE C37 SEE C2 SEE C36 SEE C2 CAP,

SMT, SEE C2 SEE C36 SEE C2

4700uF, 20%, 16V

.47uF, 20%,

1.0uF, 20%,

1000PF, 5%,

AXAL

LEAD,

.47uF,

4.7uF,

2200uF, 20%,

47uF, 20%, 10V

22uF,

10%, 20V

CER,

.0047uF,

50V

35V

50V

100uF, 20%,

10%, 35V

10%, 25V

25V

10%, 50V

16V

4450-6311

4500-l 041 4500-4742 4550-l 052

4500-l 301

4500-l 025 4450-4515

4550-474 1

4550-4751

4450-6310 4550-4762

4550-2261

4550-4721

DESIGNATION

CAPACITORS

DESCRIPTION

PART NUMBER

C80 C81 C82 - C84 C85 C86

- c95 C96 c97 C98 C99 -

C100 C101 Cl02

Cl04 C105 Cl06 Cl07 C108

Cl09 Cl10 Cl11 Cl12 Cl13

- C116

C117 C118 Cl19 Cl20 Cl21

123 Cl24 Cl25 Cl26 Cl27 Cl28 C129 Cl32 Cl34 - C139 Cl40 Cl45 C200 C201 C202 C721

C131

Cl33

Cl46

CAP, SMT, CER,

CAP, SMT, TANT,

SEE C2

SEE C25

SEE C2 SEE C25 SEE

SEE

C50 SEE C2 SEE

C50 SEE C2 CAP, SMT, CER, SEE

C5 CAP, SMT, CER, SEE C2 SEE C36 CAP, SMT, TANT, SEE

C50 SEE C2 CAP, POLYPROP,

SEE C2 SEE C25 SEE

C80

SEE C25

SEE Cl13 - C116

SEE C2 SEE C25 SEE C2

SEE C25

SEE Cl05

SEE C2 SEE C36 SEE C25 SEE C74

SEE C2

SEE C25 SEE

CAP, SMT, CER,

SEE C113

C116

.047uF, 10%,

2.2uF,

10%, 20V

33pF, 5%,

.022uF, 10%,

.22uF,

.047uF, 5%,

.0033uF, 10%,

50V

10%, 35V

50V

4500-4731 4550-2251

4500-3305

4500-2231

4550-2241

4862-2807

4500-3321

RESISTOR NETWORK

RP1 RP2 RP3 - RP4 RP5 RP6 - RP7 RP8 -

RP9

RES, NETWORK, SMT, 47K PULL-UP RES, NETWORK, SMT,

SEE

RP1 SEE RP2 SEE RP1 RES, NETWORK, SMT, 100 OHM SERIES

10K

PULL-UP

6740-2012 6740-2011

6740-2010

DESIGNATION

RESISTOR NETWORK

DESCRIPTION

PART NUMBER

RP10 RP12

RP13 RP14 RP15

RP17

SEE RP1 RES, NETWORK, SMT, CUSTOM X 15 RES, NETWORK, SMT, CUSTOM X 8

RES, NETWORK, SMT, CUSTOM X 8

SEE RP1

6740-20 13 6740-2016 6740-2015 6740-2014

TRANSDUCERS

Q1 Q2 Q3

XSTR, SMT, MMBT 3904, NPN XSTR, SEE

2N222,

NPN

8214-1035 8210-1222

SWITCHES S2

S3 S4

SWITCH, POWER 7874-0030 SWITCH, SLIDE, DPDT, RT. ANGLE 7874-0175 SWITCH, DIP, 8 POS, RT. ANGLE

7874-0169

MISCELANEOUS

Jl J2 J3 J4 (30 PINS) J5 J6 J7 J8 J9 J10 -

J13 J14 JP1 - JP3 TP1- TP15 Y1 -Y2

XY1

XY2 XU7 XU8 XU30 XU34

POST HEADER ASSEMBLY, 4 POSITION HEADER, 10 PIN, RT ANGLE, LKG HEADER, 30 PIN, RT ANGLE, LKG CONN., STRIP, MALE, RT ANGLE HEADER, 20 PIN, 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, SIP, 36 CONT. JUMPER, TEST POINT,

.020

DIA CRYSTAL, 4.00 MH2 RELAY, SPST,

9V INSULATION, CRYSTAL SOCKET, SMT, LOW PROFILE, PLCC52 SOCKET, SMT, LOW PROFILE, PLCC32 SEE XU8 SEE XU7 CONN., STRIP, RT ANGLE, 1 PIN

4230-3201 4230-7310 4230-7330 4230-7052 4230-7320 4230-2204 4230-2206 4230-l 540 4230-4025 4214-0155 4230-4031 4230-8069 5080-0001 5075-0045 6090-l 530 7574-02 10 7574-l 052 7574-l 032

42304633

SHIELD 1

HEATSINK, 16 PIN DIP SLIDE

ON HEATSINK, TO-220 NUT, HEX, LOCKING, SCREW, FIL. HD. INS, SPACER, INS,

.437"

#6-32

.138

X 32 X 1.5 LG

5415-3016

5415-2005 5814-0003 7137-0160 7574-0015

PROBE

PROBE ASSEMBLY PARTS LIST

DESIGNATION

PROBE BOARD PARTS LIST

DESCRIPTION

ASSEMBLY, PROBE CONSISTING OF:

WIRE, CLEANING ASSEMBLY, NOSECONE, THREADED ASSEMBLY, PROBE CABLE ASSEMBLY, PROBE BOARD CASE, PROBE, CASE, PROBE, RIGHT TUBING, TUBING, O-RING, SCREW, SOCKET CAP, #2-56 x CLAMP, INSULATED SCREW, FIAT HEAD, #1-42 x

NOSECONE

LEFT

TYGON, .062

TYGON, .125

5/8

ID,

3/4

ID x .5 LG

ID x .5 LG.

3/16, TYPE

.187

LG.

PART NUMBER 1738-3200

1737-0430 1737-201 1737-6004 1738-1000 1738-4700 1738-7025 1738-7030 0028-7576 0028-7577

5855-0010 7044-0950 4314-0033 7044-200

DESIGNATION DESCRIPTION

INTERGRATED CIRCUITS U1 RESISTORS R1

R2 R3 R4 R5 R6 R7

IC, SMT, LM346, PRG

RES, SMT, 1K OHM, RES, SMT, RES, SMT, RES, SMT, 20K OHM, 1%, RES, SMT, RES, RES, SMT, RES, SMT,

8.25K

40.2K

26.1K

SMT,

130 OHM, 1%,

191K

10.2K

1UAD

OP-AMP

1%, .12W OHM, OHM,

OHM,

1%, .12W 1%, .12W

.12W

1%, .12W

.12W

1%,.12W

1%,

12W

PART NUMBER

5909-0346

6650-0110 6650-l 825 6650-2402 6650-2200 6650-2261

6650-0130 6650-3191 6650-2102

DESIGNATION

RESISTORS CONTINUED

DESCRIPTION

PART NUMBER

R10 R11 R12

R13

SEE

SEE R3 RES, SMT, 243K OHM, SEE R6 RES, SMT, 2 M OHM,

CAPACITORS

Cl c2 c3 C4 C5

- C8

C9 -

Cl0 Cl1 Cl2

Cl6

CR1 CR2 CR3

CAP, SMT, CER, CAP, SMT, CAP, SMT, CER, 1uF, SEE Cl SEE C3 SEE Cl CAP, SMT, CER, SEE Cl

LED, GREEN, LED, ORANGE, LED, YELLOW,

HEADER

TANT

.130

1%, .12W

.01uF,

10% 50V

uF, 20%, 10V

10%,

.0033uF,

DIA

35V

10%, 50V

6650-3242

6650-4200

4500-l 031 4550-4762

4550-l 041

4550-3321

6084-l 071 6084-l 070

6084-l 072

Jl J2 - J3

CONNECTOR STRIP

MISCELLANEOUS

X2 SR1 -

SR2

HEADER, DBL - ROW, 2 MMSP, 12 POS

‘TERMINAL,

WIRE

WRAPPING

CONN. STRIP, RT. ANGLE, 1 PIN

TANSDUCER, PRESSURE

SEE X2

4230-l 540

7924-0061

4230-4633

1738-0427

NOSECONE

“0’‘-RING PARTS LIST

DESIGNATION

KIT, GREASE, "O"-RING NOSECONE, THREADED

W-RING

DESCRIPTION

KIT, NOSECONE, W-RING, GREASE

CONSISTING OF:

PART NUMBER

1738-9605

1738-9610 1737-6004 5855-0010

PUMP

PRINTER

PRINTER CONNECTION BOARD PARTS LIST

DESIGNATION

DESCRIPTION

ASSEMBLY, PRINTER CONNTECTOR BD.

CONSISTING OF: ASSEMBLY, CABLE, PRINTER-CONN. BD. PRINTER CONNECTOR BOARD

CONN, FIAT CABLE, 20 CONTACT CONN., FIAT CABLE, 4 CONTACT

PART NUMBER

1738-4710 1738-0205 1738-0710

4230-1620 4230-1604

DISPLAY

LIQUID CRYSTAL DISPLAY PARTS LIST

DESIGNATION

ASSEMBLY, LIQUID CRYSTAL DISPLAY

ASSEMBLY, CABLE, LCD 1738-0200

DESCRIPTION

CONSISTING OF: 1738-1010

DISPLAY, LIQUID CRYSTAL, 240 X 64

PART NUMBER

5437-1238

ASSEMBLY

ASSEMBLY CONTRA PHONE PARTS LIST

QUANTITY

ASSEMBLY TDH-39 TEST HEAD SET

DESCRIPTION

INSERT PHONE ASSEMBLY 8000-0079 CONSISTING OF:

CABLE, COAXIAL, 6’ 4204-0209

EARPHONE (AUDIOVOX) 470 ohm 8000-0037

EARTIP,

MODIFIED

PART NUMBER

8000-0255

PARTS LIST

QUANTITY

ASSEMBLY, HEAD SET CONSISTING

DESCRIPTION

OF:

HEADBAND.

EARPHONE, 60 ohm, PLASTIC TDH-39

CORD, HEAD SET, DUAL

CUSHION, EARPHONE,

MX41

PART NUMBER

8000-0175

8000-0142 8000-0046 4204-0147

8000-0143

Grason-Stadler TM262 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WARRANTY

WARNING

PRODUCT SPECIFICATION

CATALOG LISTINGS

DESCRIPTION

INSTRUCTION MANUAL

STANDARDS

AUDIOMETER

FRONT PANEL CONTROLS

Back Panel Connectors

Printer

SUPPLIED ACCESSORIES

OPTIONAL ACCESSORIES

FUNCTIONAL DESCRIPTION

INSTRUMENT DESCRIPTION

PROBE INDICATORS

FRONT PANEL CONTROLS AND INDICATORS

PRINTER AND DISPLAY

REFLEX FORMAT

NORMAL BOX FORMAT

MEMORY ERASE

PRINTING TEST RESULTS

CIRCUIT THEORY

The Microprocessors

Pure Tone Stimulus

CALIBRATION

CALIBRATION PROCEDURE

AUDIOMETER CALIBRATION

COMPLIANCE CAL

PRESSURE CAL

PRINT HEAD CAL

TROUBLE SHOOTING

DISASSEMBLY

OPENING CASE

TO REMOVE PROBE

TO REMOVE HL BOARD ASSEMBLY

TO REMOVE TIP-UP FEET

PRINTER CONNECTOR BOARD REMOVAL

LCD REMOVAL

BOTTOM CASE REMOVAL

ASSEMBLY DRAWINGS/SCHEMATICS

PROBE

PROBE ASSEMBLY PARTS LIST

PROBE BOARD PARTS LIST

PUMP

PRINTER

PRINTER CONNECTION BOARD PARTS LIST

DISPLAY

LIQUID CRYSTAL DISPLAY PARTS LIST

ASSEMBLY

ASSEMBLY CONTRA PHONE PARTS LIST

ASSEMBLY TDH-39 TEST HEAD SET