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4.1 Disassembly Procedure, AudioScope3

(continued)

4.1.9 Prepare the unit for functional check and calibration.

___ Place a known good lamp into the unit.

___  Place a known good, charged battery into the unit.
___  Perform full functional check per A specifications
___  Check frequency and amplitude / Calibrate unit.

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Содержание AudioScope

Страница 1: ...23020 23000 23040 Three Hearing Level Model 23300 Charging Stand 71123 Charging Transformers Australia 71036 Europe 71032 Japan 71030 United Kingdom 71034 United States 71040 Welch Allyn Inc 4341 Sta...

Страница 2: ......

Страница 3: ...of Document 5 32904 A 5 31 96 3 Troubleshooting RJS Intro of Document 5 32904 A 5 31 96 4 Disassembly Rep air RJS Intro of Document 5 32904 A 5 31 96 5 Drawings Specs RJS Intro of Document 1001574 B...

Страница 4: ...SIC 1 7b 21 22 Technical Functional Specifications All Models 1 8 23 SECTION 2 Service Intent of Service Manual 2 1 25 Repair Parts for AudioScope 2 2 26 Lists of Tools Fixtures Documents for Service...

Страница 5: ...1 of 1 A00273 Electronics Module Test Specification D 1 of 2 A00273 Electronics Module Test Specification D 2 of 2 A00985 Audio Module III Test Spec D 1 of 1 A01825 AudioScope III Sound Equipment Cal...

Страница 6: ...Section 1 General Information...

Страница 7: ...n of components due to aging and normal wear All service and repairs must be done by authorized Welch Allyn personnel or agents using approved Welch Allyn replacement parts and approved process materi...

Страница 8: ...is also void if the instrument is not used in accordance with the manufacturer s recommendations or if repaired by other than a Welch Allyn or authorized agent This warranty can be extended to a three...

Страница 9: ...they are functioning according to specifications Service parts are not available AudioScope pn 23020 20 dB no PT AudioScope pn 23000 25 dB no PT AudioScope pn 23040 40 dB no PT The second type is the...

Страница 10: ...igital potentiometers for calibration not mechanical pots All previous models were calibrated using mechanical potentiometer Calibration of all types of AudioScopes is explained in this manual If the...

Страница 11: ...11 ____________________________________________________________________ 1 3 Introduction to AudioScopes AudioScope 3 Handle Controls and features are shown in the figure below...

Страница 12: ...cope handle the Charger stand and transformer 1 4b AudioScope Charging Stand The charging stand holds the handle and specs and is the interface between the Handle and the charging current of the wall...

Страница 13: ...general familiarization by service personnel This outline is not intended to replace above referenced Operating Instructions pn 230231 2 1 Check that lens is centered in the instrument 2 Select an are...

Страница 14: ...nstruct patient to respond appropriately to sound Insert the tip of the speculum into the ear canal Position the tip so that the tympanic membrane or a portion of it can be visualized 6 Depress START...

Страница 15: ...no longer repairable Recalibrations CAN be performed if the unit is functioning properly If the unit fails however the lamp battery and charging stand transformer can be re used with the AudioScope3...

Страница 16: ...U4 output amplitude of the 500 Hz tone and pin 5 of U3 only and is used to control output amplifier U3 Process repeats for the 1000 Hz 2000 Hz and 4000 Hz tones 4 Logic pin 4 goes to 0v activates LED...

Страница 17: ...only and is used to control output amplifier U3 6 Logic pin 3 goes to 0v activates LED 4000 Hz LED U4 pulls pin 1 to 0v selects resistance between pin 7 of U2 and ground this charges C5 produces 4000...

Страница 18: ...13765 AudioScope Calibrator Box explained in Section 2 7 11 Tone Generation External resistors and capacitors are used to generate four different tones at hearing levels of 20 25 40 dBs The output amp...

Страница 19: ...to speaker from ASIC Pin 7 General cycle is repeated for TEST tones 1000 Hz 2000 Hz and 4000 Hz and 500 Hz 4 Logic ASIC Pin 21 goes low activates 1 kHz LED D5 1kHz sine wave Speaker produces 1 kHz Ton...

Страница 20: ...lti Level AudioScope3 ASIC Sequence Cause Effect 7 Logic ASIC Pin 24 goes low activates 500 Hz LED D2 500 Hz sine wave Speaker produces 500 Hz Tone appears at ASIC Pin 2 and is amplified and then appl...

Страница 21: ...U3C U4 sequentially toggles pin Generates digital base amplitude 19 20 21 22 sinewave at pin TP10 General cycle is repeated for TEST tones 1000 2000 4000 and 500 Hz 5 Logic U4 pin 8 goes to 3 V activ...

Страница 22: ...o calibrated level This establishes feedback resistance for U3C U4 sequentially toggles pin Generates digital base amplitude 19 20 21 22 sinewave at pin TP10 8 Logic U4 pin 5 goes to 3 V activates 500...

Страница 23: ...2 0 seconds Sound level Sound levels were established by threshold loudness balance method to TDH 39 receiver with MX41 AR cushion per ANSI S3 6 1969 Ref Thresholds These levels were established in a...

Страница 24: ...24 Section 2 Service ______________________________________________________________________...

Страница 25: ...parts catalog Part number changes product updates or new test procedures should be noted on the appropriate page of this manual by the manual owner Notices announcing these changes should be attached...

Страница 26: ...419 501 Rubber feet set of 4 711418 501 Base plate assembly 711421 Mounting hardware kit 711420 6 x 3 4 PHPS HD screw self tap 230035 2 Miniature transducer 230038 Transducer boot 230029 1 Stabilizing...

Страница 27: ...sound output B K 4134 1 2 Microphone Sound pick up B K 1625 1 3 to 1 Filter Acoustic filter B K Power Supply 6 V D C Powers B K 2231 Knowles DB100 R 496 Occluded Ear Simulator Connects T 1393 and T 20...

Страница 28: ...est Specification D 1 of 2 A00273 Electronics Module Test Specification D 2 of 2 A00985 Audio Module III Test Spec D 1 of 1 A01825 AudioScope III Sound Equipment Calibration and Setup C 1 of 1 A00942...

Страница 29: ...______________________________________________________________ 2 3b Tools and Fixtures Setup for Calibration AudioScope and AudioScope 3 s n 969999 ASIC Figure 2 3b Calibration Set up for AudioScopes...

Страница 30: ..._____________________________________________________________________ 2 3c Tools and Fixtures Setup for Calibration AudioScope 3 s n 970000 Microcontroller...

Страница 31: ...AudioScope handle and Charging Stand Refer to the Table of Contents for complete information on the manual Use this manual for Self Training Have an AudioScope system on hand to help with familiariza...

Страница 32: ...spring 2 5 2 ___ Check the tightness of the charger jack 2 5 3 ___ Remove RTV from the potentiometers 2 5 4 ___ Check that the sound tube extends at least 1 16 to 1 8 into the cavity behind the lens...

Страница 33: ...ngs and their tolerances as shown on the print Your Sequence Original Step number from A00277 Modifications if any 2 5 6 ____ step 1 Start Button Check for smooth operation 2 5 6 ____ step 2 On Off Sw...

Страница 34: ...uipment as per AudioScope II Sound Equipment Calibration and Setup Procedure A01825 Calibration Materials Required Audiometer Handle Test Specifications A00277 1 sheet This is the process Electronics...

Страница 35: ...277 Modifications if any 2 6 14____ step 10 Lamp Ejector 2 6 15____ step 11 Trained Listener Calibration is complete If AudioScope3 ASIC does not take calibration proceed to troubleshooting section Af...

Страница 36: ...equipment as per AudioScope II Sound Equipment Calibration and Setup Procedure A01825 Calibration Materials Required Audiometer Handle Test Specifications A00277 1 sheet This is the process Electroni...

Страница 37: ...el to the specified level per A00985 in Section 5 of this manual using the UP and DOWN buttons on T 13765 The level will change in prescribed increments each time the buttons are depressed f___ When d...

Страница 38: ...Section 3 Troubleshooting...

Страница 39: ...peaker does not produce tones Cold solder joint at speaker or wire to PCB Restore connection by reflowing joint using T19102 2 Broken speaker wire Repair wire Defective speaker Replace speaker No volt...

Страница 40: ...on by reflowing joint using T19102 2 Broken speaker wire Repair wire Defective speaker Replace speaker No voltage at TP2 Replace Board Does not calibrate at a particular frequency Defective speaker Re...

Страница 41: ...41...

Страница 42: ...42 Section 4 Disassembly and Repair...

Страница 43: ...or the stabilizing grommet Lens gaskets are installed during assembly before right and left side cases are bonded together Replacement is not covered in this manual 4 1 1 Prepare the unit for disasse...

Страница 44: ...moval ___ Unscrew two screws at the positive terminal end of the circuit board ___ Pull the board towards the battery compartment and carefully lift the board out 4 1 6 Power jack removal ___ Unscrew...

Страница 45: ...y Procedure AudioScope3 continued 4 1 9 Prepare the unit for functional check and calibration ___ Place a known good lamp into the unit ___ Place a known good charged battery into the unit ___ Perform...

Страница 46: ...mbly removal ___ Unscrew four screws holding the base plate assembly to the housing assembly ___ Push the base out of the housing if it sticks with the handle of a screwdriver or small hammer ___ Lift...

Страница 47: ...47 Section 5 Drawings Test Specifications...

Страница 48: ...48...

Страница 49: ...1 A00273 Electronics Module Test Specification D 1 of 2 A00273 Electronics Module Test Specification D 2 of 2 A00985 Audio Module III Test Spec D 1 of 1 A01825 AudioScope III Sound Equipment Calibrati...

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