Welch Allyn AudioScope Service Manual Download Page 42 | Manualshive

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Section 4:

Disassembly and Repair

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Summary of Contents for AudioScope

Page 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...

Page 2: ......

Page 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...

Page 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...

Page 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...

Page 6: ...Section 1 General Information...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 24: ...24 Section 2 Service ______________________________________________________________________...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 38: ...Section 3 Troubleshooting...

Page 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...

Page 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...

Page 41: ...41...

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

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 48: ...48...

Page 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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