Audioscope 3 Screening Audiometer Service Manual
Contents
1. moams THOS PUSH BUTTON 16 3 TIMING DIAGRAM EC LS 13 9 SEC SEE SHEET 2 2 SEE EON 23008 T1293 ALSO OM 10 GREEN LED 6 5 AMPLITUDE ot WELCH ALLYN INC SKANEATELEO FALLS N Y 7 ELECTRONICS MODULE TEST SPECII IFICATION Edere ORAWINGS AND SPECIFICATIONS ARE THE PROPERTY WELCH ALLYN INC AND RHALL REPRODUCED OR CONIED USED AE FON OR GALE OF EQUIPMENT CM DEVICES WITHOUT WRITTEN 73 MODULE SPLCIFICATION T COMPLETION OF ASSEMBLY NODULE SHALL BE SUBJECTED TO THE TESTS LISTED BELOW NO SHALL SHIPPED NOR STOCKED WHICH DOES NOT PASS ALL TEST CRITERIA 10090 INSPECTION 15 ROT REARED ON TOSE TESTS MARKED WOH AN ASTERISK K TESTS PER FORMGD IN THE ORDER LISTED WALOV SHALL BE 1AMEDIATILY OISCORTAUED ON ANY MdBULF THAT FAILS TEST OR CARMOT HE TO ACCEI VALUE ALL TESTS LAVOLYING SOUND LEVEL MUASURE gt M NT SHALL JADE IM ANSI ERT QDUMD LEVEL AT LEAST 19 YAE DESIRED LEVEL ACASURED dh SPL REL TO 20 APPROPRIATE OCTAVE FILTER DURING THE SOUND LEVEL MEASUREMTHT TEST THE MODULE MUST 5 CUNEJ TO A 230075 5012. A ds DUNG HOV Or ges DESCRIPTION LIST OF MATERTAL WELCH ALLYN INC SKAMEATELES FALLS N Y U S A AUDIOSCOPE III SOUND EQUIP MENT CALIBRATION AND SETLP THESE DRAWINGS AND SPECIFICATIONS ARE THE PROPERTY OF WELCH ALLYN INC REV REVISION DESCRIPTION INIT DATE APPROVAL SED A MANUFACTURE OR SALE OF EQUIPMENT OR DEVICES WITHOUT WRITTEN PERMSSION B S ADD E ATE 45 3 20 87 ET ME At the completion of assembly the following must be done to the stand 1 Plug 71040 Charger into the jack and plug the charger into 120V A C Insert a production model AudioScope handle complete with battery into the charging well and the L E D shall im mediately become illuminated Move handle around in circular motion inside well three timea clockwise and three times counter clockwise Tip charging stand with handle inserted between 30 to 459 Off axis Then rotate charging stand so handle wobbles for three turns each direction If L E D doea not fiicker consistently in same position or go out compietely unit is to be judged acceptable Repeat Steps 2 thru 5 using production model Tympanometer handle Complete with battery MAY 2 4 507 UNLESS OTHERWISE SPECIFIED DRAWN WELCH ALLYN ING TOLERANCES ON CHECKED SKANEATELES FALLS U S A BASIC CHARGING STAND ELECTRICAL UE TEST SPEC EHE 6 TO 24
3. 1 Lu NE L vouT n m EE vec LEVEL SELECTION 2 Be y vor 4 4 n 4 4 w El e ue 4 E vea po Po aa e ee T UM 4 SO amp MATE 1900002 VAS asian 250000 em us vr XAUDOBCOPE ELECTRICAL SCHMATE POWER SUPPLY PETERE LAMP DRIVER E wine ga DTE PTT W ad say Usar Ur vu pres I z x I T e T
4. 24 015 A00942 8 7 1 6 5 1 4 3 2 250250 Arr 4 mime amener 4 RECO COMMELIIUN ADD C2 CB 4 RIG i EXTERNAL CONNECTIONS R i a 5 0 98 3 CEXCRUPT OM LIST Of MATERIAL WELCH ALLYN INC SXAMEATELES FALLS U S A AUDIO 11 SCHEMATIC 10 230230 79 DO MOT SCALE 1 B CAMPAGNA inr ta mexi 3 T i L onmo 7 ire art aevo 099 00094 jamam was sore m ec mie APRI T grz 335 325 FEVD 2360746 230076 REN 8 90 E sa i 22 93 E Rm mr iuinuoj0 26 94 THIS AREA IS TO MASKED DURING WAVE SOLDERING OPERATION ITEMS 4 AND 5 ARE TWISTED TOGETHER AS SHOWN A REL TO PROD ENG free Mas 2 29 06 RRS ARER 19 1950 010 ioris 218 NOTES wevo rc eo 2 12 86 115 D pm uw aas 3713707 COMPONENTS TO LOCATED 5 SHOWN MOUNTED SO 5 TO MINIMIZE THE TELA hem a DISTANCE BETWEEN THE COMPONENTS AMD THE
5. TEST SPEC 00275 AUD TOSCOPE 1 2 5 CHARGE CURRENT 71040 FIG 4 PNEUMATIC SEAL CHARGER 120 THESE TESTS ARE ONLY REQUIRED IF THE ELECTRONIC MODULE INPUT 6 NOT CALIBRATED IN THIS PARTICULAR HANDLE OR THE MODULE wAS REMOVED FROM THE HANDLE EXACT MEASUREMENTS ARE NOT REQUIRED FOR 100 INSPECTION Dp D C AMMETER SUPERSEDES DWG DATED 2 20 B2 TIRE puer AUDIOMETER HANDLE e SSE ram TEST SPECIFICATIONS xx ore NO M 00277 8 7 6 4 gt 2 31 D 00984 J REV REVISION DESCRIPTION DATE APPROVAL A REL TO PROD ENG 9 30 86 RRB ABB kole ANP HECTOR An eferwl 10 16 85 RRB C REV D NOTES 3 8412 8 4 87 4 I n FIGURE IMING DIAGRAM IGURE 2 D REV D NOTES 7 9 10 11 amp 12 itas CRW 9 30 87 wus NDIVIDUAL TONE AND SPACE ERRORS DER SIDE OF REV D NOTES 3 7 8 10 amp 11 TI pre NI DELETED NOTE 12 1 75 0 50 ARE N
6. v REVISION DESCRIPTION ECN DATE RE LEASE TO PROD ENG 5 19006 5 5783 ena 1 3 4 5 FIGURE 1 TABLE TIME 60 mSec 40 mSec ON TIME 5 Sec Sec OFF TIME 75 2 1 Sec HOOK OSCILLOSCOPE UP TO TEST FIXTURE MAKE THE FOLLOWING OSCILLOSCOPE SETTINGS RISE 1 IME CH DC 20 OR 50 MSEC POSITION KNOB 1 O CLOCK STORE MODE NORMAL TIME DIV 2 SEC COUPLING HF SOURCE CH 0 MAKE SURE THE GRIEN LIGHT IN THO UNIT BEING TESTED AMPL IS ON PRESS THE START BUTTON ON THE AUDIOSCOPE II BOARD AND RECORD ENTIRE SEQUENCE IN A STORAGE OSCILLOSCOPE YOU SHOULD NOW HAVE A TRACE SIMILAR TO THAT IN PEG SAVE THE TRACE AND INCREASE HORIZONTAL MAGNIFICATION BY 10 SET UP THE POSITIONING TO VIEW THE SECOND PULSC IN THE PULSE TRAIN 1000 HZ TO MLASUHE THE RISE TIME MEASURE THE TIME HORIZONTAL DISTANCE BETWEEN POINTS INDICATED BY A AND B ON FIG 2 THE TIME IN MILLISECONDS SHOULD BE WITHIN 10 OF THE TOLERANCES LISTED iN TABLE i E AMPLITUDE C MN TIME D FIGURE 2 OFF PME E 10 HLASURE THE ON MEASURL THE TIME BETWEEN THE POINTS INDICATED C AND D IN FIG 2 THE TIME IN SECONDS SHOULD BE WITHIN THE TOLERANCES LISTED ON TABLE 1 IO MEASURE THE OFF TIME POSITION THE DISPLAY USING BASIC IHE LEFT RIGHT POSITION KNOB SO YOU CAN MEASURE THE TIME BETWEEN POINTS D AND E AS INDICAT
7. Excessive battery drain Shorted lamp Replace Lamp 39 3 2 Troubleshooting AudioScope 3 s n gt 970000 MICROCONTROLLER NON ASIC Complaint Corrective Action Unit does not turn on Low battery voltage Substitute with charged test Green LED does not light battery and retest Replace battery Retry If green LED remains unlit replace board Cold solder joint at battery Restore connection by terminal reflowing joint using T19102 2 Defective contact in power jack Replace power jack will not close when charge plug is removed Low battery voltage Defective power jack Replace housing 7 1 Defective charging stand Check circuit and restore Speaker does not produce Cold solder joint at speaker or Restore connection by reflowing tones wire to PCB joint using T19102 2 Ca _ particular frequency not cal replace PCB and retest Does not calibrate at any Call box plugged in backwards Plug cal box connector into PCB frequency with orange wire towards crystal PRETONE L E D is blinking Unit needs calibration rotate 180 degrees Reinstall umma Jie ttc repe _ Ree O contacts in charging well Replace Housing Assembly 40 pI Section 4 Disassembly and Repair 4 1 Disassembly Procedure AudioScope3 Caution The battery and lamp become very hot during operation
8. Push the base out of the housing if it sticks with the handle of a screwdriver or small hammer Lift the holder top portion of the charging stand out of the housing 4 2 3 Rubber feet Push old rubber feet out of base plate Push replacement feet into holes in base plate 4 2 4 Reassemble Slide holder into housing assembly Do not crush contacts Place base into housing assembly Attach base to housing assembly with four screws 4 2 5 Test Connect a known good charger to the Charging Stand jack Puta known good handle into the charging well Charging light will light if stand is functioning normally 46 Section 5 Drawings Test Specifications 48 5 1 Drawings and Test Specifications This section contains the following documents for service and calibration of AudioScopes Drawing Description Size sheets A02030 Repair Calibration Spec for AudioScope 1 of 1 A00277 Audiometer Handle Test Specifications D 1 of 1 A00984 P C B Test Spec AudioScope D 1 of 1 A00273 Electronics Module Test Specification D 1 of 2 A00273 Electronics Module Test Specification D 2 of 2 A00985 Audio Module Test Spec D 1 of 1 A01825 AudioScope Sound Equipment Calibration and Setup C 1 of 1 A00942 Charging Stand Electrical Test Spec A 1 of 1 230230 Audio Il Schematic PCB for ASIC version D 1 of 1 230215 PC Board Ass y for ASIC version D 1 of 1 236630 PCB Schematic for Microcontroller version B Parts
9. Operating Program 3 Lev s n gt 970000 nonASIC 1 7b 21 22 Technical Functional Specifications All Models 1 8 23 SECTION 2 Service Intent of Service Manual 2 1 Repair Parts for AudioScope 2 2 26 Lists of Tools Fixtures Documents for Service 2 3 Fig 2 3b Tools Fixtures Setup for Calibration for AudioScope and AudioScope 3 s n 969999 2 3b 29 Fig 2 3c Tools Fixtures Setup for Calibration for AudioScope 3 5 gt 970000 2 3c 30 Training 2 4 31 Calibration Single Level 23020 23000 23040 2 5 32 33 Figure 2 5 4 Sound Tube Placement Adjustment 2 5 32 Calibration Multi Level 23300 s n 969999 2 6 34 35 Calibration Multi Level 23300 s n 970000 2 7 36 37 SECTION 3 Troubleshooting 23300 Troubleshooting AudioScope 3 s n 969999 3 1 39 Troubleshooting AudioScope 3 s n 970000 3 2 40 SECTION 4 Disassembly and Repair AudioScope 3 Handle 4 1 43 45 Charging stand 4 2 46 Table of Contents cane SECTION 5 Drawings Test Specifications Manilla Pockets contain 17 x 22 drawings 5 1 Drawing Description Original Size Zsheets A02030 Repair Calibration Spec for AudioScope 1 of 1 A00277 Audiometer Handle Test Specifications D 1 of 1 A00984 P C B Test Spec AudioScope D 1 of 1 A00273 Electronics Module Test Specification D 1 of 2 A00273 Electronics Module Test Specification D 2 of 2 A00985 Audio Module Test Spec D 1 of 1 A01825 AudioScope Sound Equipment Calibration and Setup C 1 of 1 A00942 Cha
10. Using TRE APPROPRIATE FILTER SHALL 66 ALJUSTED TO THE VALUES SHOWN USING IHE ATE TRIMMER SEE FIG 2 THE ADJUSTHEWT SHALL YIELD A EVEL INDICATION WITHIN 29 20 dh OF THE DESIRED THE LEVEL SHALL BE STABLE WITHIN 0 1 db DUKING THE 2 SEC PERIOU FOLLOWING THE INITIAL RISE TRAINED 1 AS FINAL PEWUN WITH HyARTHC kTANLE TPURE I WE CONOUCTI TJRENHCLDG 5 DB M L OR 1 88 BRTMEUN 00 AND 4000 Ns SHALL ISTEL HR WSTRz IN QUIET ROGN RUuH SOUJM LEVELS AT LEAST 10 DB TRE LEVELS AT EACH OCTAVE BAND SMALL LISTER POR THE FOLLOWTWO m IXTEMSITI OF TONES QUALITY OF gTART STOP OF TONER d TXTRAKE QUS MOSSE BETWEEN TONES ESPECIALLY HIGH SQUEALS OR STATIC THEY HAY REJECT INSTRUMENTS THAT VARY SIGHIFICANTLY FRON INSTRURENT OF CALIBRATION AND QUALITY LAMP EJECTOR WHILE THE MODULE 5 2300D0 501 AUDIOMETER ASSY 06200 LAMP SHALL INTO THE HOLDER THE LAMP SHALL CENTER QN THE FIBER OPTIC BUNDLE AMD BECOME ILLURINATED THE LAMP EJECTOR S DEPRESSED THIS SHALL EJECT THE LAMP 19 POSITION WHERE YT 15 EASILY ACCESSIBLE BY HAND BUAN IN COMPLETION OF ASSEMBLY AUD BEFORE ALL UNITS WILL BE POWERED UP AT THE NOMINAL OPERATING SMALL BE OFERATIOMAN CONTINOUSLY UGUNG THE BURN N W
11. intensity and quality There is a moderate fee for recalibration Properly trained technicians will need specialized commercially available test equipment custom made Welch Allyn T tools specialized tools and fixtures basic electronic hand tools and Welch Allyn specifications and drawings to properly diagnose calibrate and repair the AudioScope and charger base Item description B amp K 2231 Modular Precision Sound Level Meter B amp K 4134 1 2 Microphone B amp K 1625 1 3 to 1 Filter B amp K Power Supply 6 V D C Knowles DB100 R 496 Occluded Ear Simulator Knowles DB 009 Teflon washers Fluke 1900A Frequency Counter 3 accuracy Oscilloscope Tektronix 2230A or Equiv storage type ESD mat and wrist strap Electronic Technicians hand tools kit Digital Volt Ohm Meter PACE Soldering Equipment Set iron to 700 F 27 F Rosin Core Solder 020 635 37 G E RTV 108 Clear Thick Power Supply 0 5 VDC 1 Amp AudioScope Holding Device Coupling Tool for Microphone Latchup Box for AudioScope 1 and AudioScope3 with ASIC s n 2969999 Microphone Handle Cover AudioScope Calibrator for Microcontroller digital adjust non ASIC Charging jack pin spanner Function T amp M Measures sound output Sound pick up Acoustic filter Powers B amp K 2231 Connects T 1393 and T 2011 Seals microphone and DB 100 connection Calibration and testing Calibration and testing Repair General Repair Troubleshooting Repair
12. 2 INCH MICROPHONE AS PRE CAL BOX CONNECTOR SHOULD FACE THE END NEAREST THE CRYSTAL SCRIBED IN THE FIGURE ABOVE 10 dB SHOULD BE ADDED TO THE MEASUREMENTS TAKEN TO ATTACH THE MICROPHONE AS SHOWN IN FIG 1 SLIDE THE SWITCH THE OBTAIN THE DESIRED VALUES IN THE CHART SEE amp K INSTRUCTION MANUAL FOR AN 25dBHL ON POSITION PLACE THE RUN CAL SWITCH ON THE CAL BOX TO ADDITIONAL EXPLANATION GM DU MEE urs oU SHOLLI Hz FOR QC PURPI AND RECAI IRATION IE OCA PEE ACTA pee El HI L HI 1 THE CENTER OF THE RANGE IS ATTAINABLE SELECT POINT TOWARDS THE E UPPER HALF DF THE RANGE wie AFTER THE PROPER LEVEL IS SET DEPRESS THE SAVE amp INCREMENT BUTTON ON THE CAL AND THE HANDLE WILL MOVE TO THE NEXT TONE BE ADJUSTED REPEAT THIS SEQUENCE FOR ALL THE REMAINING FREQUENCIES RECALIBRATIUN ANY UNIT QUT OF SPEC SHOULD BE SET TO THE A E REMEMBERING TO SELECT THE CORRECT FILTER THE TABLE IN FIGURE 2 AND THEN CHECKED TO THE TABLE IN FIGURE 4 Na AND INCREMENT AFTER THE SOOHz LEVEL BEFORE PART DESCRIPTION IGING di 15 8 ONCE THE PROPER ADJUSTMENT HAS BEEN MADE ALL FREQUENCIES THEN MOVE AND SHALL NOT BE REPRODUCED OF COPIED DR USED AS BASIS FUR MANUFACTURE m THE SWITCH TO THE 20 dB SETTING VERIFY THAT THE PROPER SDUND LEVELS SALE OF EQUIPMENT OR DEVICES MITHOUT WRITTEN PERMISSION D C FOR THAT SETTING ARE AC
13. ARE 64 D RELATIVE ENVELOPE ARPLI TUDE SEE FIG 3 TIMING Mr DURATION OF TONES AND PAUSE BETWEEN THER CHECKED THIS SHALL BE MEASURED BY THE ELECTA CAL GISWAL ETWEER TEST POINT 2 AND 1 SONY TINE THE OW TEME AS MEASURED FROM THE TRARY OF Tee hist THE INITIATION OF THE FALL SHALL 1 5 30 2 SEC SEE FIG 3 OFF 1186 THE TIME AS MEASURED FROM THE K FALL TO THE START OF THE MEXT PRISE SHALL 8E 1 6 0 2 560 SEE FIQ 3 STAAT UP TINE TIAE BETWEEN ACTUATION MEZTTOR THE START OF AtSE Qf THE FIRST TONK SMALL 64 1 3 2 1 SEC THE TIME BETVEEN ACTUATION OF THE NS RE LIGHTING OF THE Gal t SHALL EG 13 9 1 9 SEC THE MODULE SHALL BE PUT THROUGH ANOTHER CYCLE 97 ACTWATUNQ THE BUTTON SWITCH TO TEST THE ARSTART LOW BATTERY FUNCTIONS x AT ANY POLNT PURING THE CYCLE THE PYSHEUTTON oDRPRRSSQB ANY L E D THAT WAS LIT WOWLD o THE MORMAL SEQUENCING SHOULD STZAT OVER E D SHOULD 80 047 AM THE YELLOW Lf SHOULD LIANT AT YOLYAQE SETVELN 3 10 AWD 3 407 Y OME L QN AT A TINE REITRER 1 1 0 SHGULE FLICKER MEL EC FDR LMA TOME SMALL MEASORED FROM POWT WO TO WE THD SHALL NOT EXCEED 5 0 SOUNE THE SOUND LEVEL MEASURED AT THE KAB TINUTATO
14. HOUSING ASSEMBLY AS SHOWN IW 230000 501 AUDIOMETER ASSY LENS HOLOER ASSY 100055 501 15 ALSO ADDED CHARGED 72300 BATTERY QR AM EXTERNAL POWER SOURCE OF 3 50 0 10 V D C SMALL APPLIED YO THE INPUT TERMINALS OF THE MODULE THE HOUSING ASSY SHALL COUOLED TO AN OCCLUDED ERR SIMULATOR R ANSI STD NO 53 25 1479 BE PURCHASED FROM sHOUSTRIAL RESEARCH PRODUCTS INC PART NO 08 100 VIR WELCH NO 243055 MED SIZE SOFT AND NO 4993 COUPLING FIXTURE SEE FIG L1 MUST BE TAKEN D PROVIDE AN ACOUSTIC SERL BETWEEN ALL COMPONENTS STAAT yE 1 THE SLIPE SWITCH 18 MOVED TO THE 40917104 CLOSEST TO THE L f b THE L E D ONLY SHALL IAMEDIATILY MATER ALIER CHECK THIS TAST 13 OPTIONAL IT MAY ME 05 RAPIBLY ASSESS FURCTIONALITY OF KODULE THE SOVNA LEVEL METER M OUTPUT 15 MPLIFIZB DRIVES A LOUSSPEARER THE Pi IS CTUAT amp D SERIES FOUR TONES 66 COINCTOE WITH SEQUENTIAL LICETIKE OF THE Foye RED i THE GREER L t SNOULU RE LIGAT AT TRE ERD OF THE CYCLE 1 THE FRSHEUTTON SWITCH SHALL BE OEPAESS LY THE GREEN L amp 0 RMALL GD OUT AMD THE POUR 1 0 9 9 SHALL ILLUAINATX SaQUENTFALLY WHEN CACM RED L E U LIGHTS IT SHALL BE LATCHES CCWURCTINC TEST FOLAT NO 1 70 GROUND EEGATIVE BATTERY IT HAY BE UNLATCHED SY DI CONMICTIBG T
15. Materials Required Audiometer Handle Test Specifications A00277 1 sheet This is the process Electronics Module Test Specification A00985 1 sheet These are the specifications Note A note appearing on the specification reads Exact Measurements are not required for 100 inspection This note does not apply to sound settings Adjust the AudioScope according to the printed sound settings and their tolerances as shown on the print Sequence Original Step number from A00277 Modifications if any 2 6 6 step t1 Start Button Check for smooth operation 2 607 ___ stept2 On Off Switch 2 6 8 ___ L E D s LED s must be bright 2 6 9 step4 Rattle 2 6 10 step 7 2 6 11 step 8 Pneumatic Seal Check seal before sound 2 6 12 step 5 Sound Level 2 6 13 step 9 Charge 34 2 6 Multi Level AudioScopes 23300 ASIC TYPE up to and including serial no 9609999 Calibration Continued Sequence Original Step number from A00277 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 After repair of the AudioScope3 calibrate If the unit cannot be repaired replace the failed AudioScope 3 ASIC board with a new style Microcontroller based board and calibrate it according to instructions in Section 2 7 35 2 7 Calibration Procedure Multi
16. PERIOD BE OF 24 HOURS PERIOD DOESNT AME CORTINSDUS HOUSING ASS Y THE HOUSING ASSY 230013 501 USED TOR INIT CALIBRATION SHALL CONTAIN A SPECIALLY SRECTED FIBER SPECULUM ASSY 200005 502 WITH SEATING DIMENSION OF 240 2 005 AMD GRIND LENGTH UF 1 632 005 RYO NOTE 3 STOR SEE SHEET v 0 MD CYCLE 2 INC AGE BAY 1 5 50Y TRAINED LISTENER 15 DR H L WAS 1098 SEE ECN LIST OF MATERIAL WELCH ALLYN INC SKANEATELES FALLE N Y U S A T ELECTRONICS MODULE TEST SPECIFICATION 00273 1 B 7 1 5 4 1 1 REL 10 PROD ENG iga cw 9305 SDUND LEVEL METER B NOTES i rn 1 D NOTES us FIGURE 1 TEST SET IRE IRI NL jus rad tee Rn ET FIGURE 2 FIGURE 3 TIMING DIAGRAM REF NEM II ESTIS RV NOTES 40070 FIGURE 4 p K MEDIUM SIZE INDIVIDUAL TONE AND SPACE ERRORS 32 4 WAS 32 3 35 7 WAS 35 2 19501 i ARE NON CUMULA
17. Switch ON Lamp ON Ready LED ON Press START ASIC activated pin 20 goes low activates PT PreTone LED D6 PreTone 1kHz sine wave Speaker produces 1 kHz PreTone appears at ASIC Pin 4 and is amplified and then applied 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 5 Logic 6 Logic ASIC Pin 21 goes low activates 1 kHz LED D5 1kHz sine wave Speaker produces 1 kHz Tone appears at ASIC Pin 3 and is amplified and then applied to speaker from ASIC Pin 7 ASIC Pin 22 goes low activates 2 kHz LED D4 2kHz sine wave Speaker produces 2 kHz Tone appears at ASIC Pin 6 and is amplified and then applied to speaker from ASIC Pin 7 ASIC Pin 23 goes low activates 4 kHz LED D3 4kHz sine wave Speaker produces 4 kHz Tone appears at ASIC Pin 5 and is amplified and then applied to speaker from ASIC Pin 7 1 7a Operating Program 23300 ASIC TYPE up to and including serial no 9609999 Multi 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 applied to speaker from ASIC Pin 7 8 Logic cycle completes itself and activates D1 Ready LED illuminates 9 Manual switch off unit deactivates lamps amp logic off 1 7b Operating Program 23300 Microcontroller type serial no 9670000 and hi
18. catalog pages 230137 3 Nos 23000 23020 23040 AudioScope A 1 of 1 230237 1 No 23300 AudioScope and 3 A 1 of 1 711408 2 No 71123 Charging Stand A 1 of 1 CEU C ESO 8 7 6 4 4 2 THESE PROPE WELCH ALLYN INC AND SHALL NOT REPRODUCED COPIED OR USED AS A BASIS FOR MANUFACTURE OR SALE OF EQUIPMENT OR DEVICES WITHOUT WRITTEN PERMISSION THE FOLLOWING MEASUREMENTS ARE TO BE PERFORMED PER 00985 IF THE MEASUREMENT IS NOT WITHIN THE SPECIFICATION LISTED BELOW THEN THE INSTRUMENT IS TO BE READJUSTED FOR THAT PARAMETER READJUSTMENT MAY Bz MADE IN THE SAME HANDLE IF THE INSTRUMENT CANNOT READJUSTED SUCH THAT THE NEW MEASUREMENT 15 WITHIN SPECIFICATION THEN IT SHALL REPAIRED OR THE PC BOARD SHALL BE REPLACED FREQUENCY CANNOT BE FOR MCASUREMENT PURPOSES 5 USTED 5 D READJ 500 t5 DB AT SOUND LEVEL 15 05 AT 14 DB 4000 HZ 1000 AND 2000 Hz PRETONE 1000 HZ THE FOLLOWING ADDITIONAL MEASUREMENTS ARE TO BE FOR ONE TONE ONLY THE RESULTS SHOULD MATCH THOSE OF TABLE IF THE MEASUREMENT IS NOT WITHIN THE SPECIFICATION LISTED THEN THE INSTRUMENT SHALL BE REPAIRED OR THE PC BOARD SHALL BE REPLACED NOTE MEASUREMENTS AND SPECIFICATIONS THE 1000 HZ SECOND PULSE ONLY IN TABLE 1 ARE FOR REMOVE AUDIOSCOPE BOARD FROM THE HANDLE INSERT IT INTO SPECIAL TEST FIXTURE APPLY DC POWER AND 2 m APPROVAL
19. circuit is complete 1 5 Use of the AudioScope Screening Read pg 6 8 of Operating Instructions pn230231 2 shown below for full details of the screening procedure L Note The following excerpt is only an outline intended for 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 area that is relatively quiet and free from distracting sounds See page 26 of Operating Instructions for Maximum Permissible Ambient Noise for the different screening levels 3 Select appropriate size specula and twist onto instrument USE ONLY GRAY TIPPED WELCH ALLYN AUDIOSPECS 1 5 Use of the AudioScope Screening continued 4 5 Turn AudioScope3 ON by sliding the selection switch to the desired screening level Instruct 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 Depress START button and observe each tone and the patient s response Repeat these steps for opposite ear Remove instrument from patient s ear and turn off Return to the Charging stand REFER TO Operating Instructions 1 6 Operating Program of Models 23020 23000 23040 Single Hearing Level AudioScope NOTE Since these models of AudioScopes are well over ten years old the circuitry is no longe
20. new board containing the digitally adjustable Microcontroller This board will fit the AudioScope3 with no modifications Unit performance is the same Obsolescence of Single Level AudioScope Single Level AudioScopes are over ten years old Service Parts are not available Recalibrations CAN be performed on properly functioning single level AudioScopes For failed units save the lamp battery and charging stand transformer for use with AudioScope3 10 1 3 Introduction to AudioScopes AudioScope 3 Handle Controls and features are shown in the figure below Lens Low Battery Tone Indicator indicators B Pretone LM Indicator Switch READY Indicator Start Button Charging Jack 11 1 4a Basic System Description There are three components to the Welch Allyn AudioScope the hand held AudioScope handle the Charger stand and transformer Handle will fit into well ONLY ONE WAY Handle receptacle for charging AudioScope 3 Four posts for storing Welch Allyn AudioSpecs Indicator light illuminates when instrument is charging properly y E EN Charging Transformer Charging Stand 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 transformer Insertion of the handle into the charging well completes the charging circuit An LED illuminates when the handle is in the well and the charging
21. the speaker off of the metal spring clip Gently pull the speaker out of the boot Note the position of the red and black wires relative to the imprinting on the speaker and un solder them using T19102 2 4 1 3 Speaker replacement Solder red and black wires to new speaker in the order noted above in step 4 1 3 Gently press the speaker into the speaker boot 43 4 1 Disassembly Procedure AudioScope3 continued 4 1 4 Stabilizing Grommet removal sound tube gasket near lamp Slide the speaker boot off of the clip and pull the sound tube out of the stabilizing grommet Peel the old grommet out of the ring at the end of the board Install new grommet by carefully pressing it into the ring Insert the sound tube into the stabilizing grommet and then slide the speaker boot containing the speaker onto the spring clip Adjust the height of the sound tube so that approximately 1 8 extends into the housing behind the lens See Figure 2 5 4 Perform a leak check on the instrument after replacing stabilizing grommet 4 1 5 Printed circuit board removal 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 jack ring nut with T 10912 Un solder using T19102 2 three connections on back of jack Remove jack from housing Reassembly 4 1 7 Install power jack Put jack through hole in housing so t
22. 0215 i PARS APPLICATION DO SCALE B CAMPAGNA 2 pet or 3 2 6 5 2 2 LI 7 ay T I T XE ra D ERN 7 79 to metron tan m er om E var 1 m p E 1 a PST LOW BATTERY INDICATION MICRO CONTROLLER x 02 TONE GENERATION amp AMPLIFIER vee me om WA woo vee hj z EM iw sre 1 S 1 zE M RU 700K me CRT 1 Wl d vec Eu 5 es CALIBRATION 5 START 4 i Re dn Me loses E 1 vec vec vec vee vec ed 1 mu imn cmm QR 0 CS 0 Toor fao E e e 141 vss i 22 ___
23. 22 cycle completes itself and activates D2 9 Logic 10 Manual switch off Effect activates 4000 Hz LED D6 04 ramps 05 digital pot to calibrated level This establishes feedback resistance for U3C Generates digital base amplitude sinewave at pin TP10 activates 500 Hz LED D7 04 ramps 05 digital pot to calibrated level This establishes feedback resistance for U3C Generates digital base amplitude sinewave at pin TP10 Ready LED illuminates unit deactivates lamps amp logic off 22 1 8 Technical Specifications Charging Stand Application 71123 Charging Stand for all models of AudioScope Charging Transformers Model Application 71040 USA and Canada 71036 Australia 71032 Europe 71030 Japan 71034 United Kingdom Handles Frequencies 500 1000 2000 4000 Hz 3 Distortion Less than 3 total harmonic distortion as measured at transducer input Rise fall times 20 to 200 msec as measured between the 1 and 20 dB points Tone duration 1 5 seconds 0 2 seconds Pause between tones Varied between 1 0 and 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 an independent study and are equivalent to standard audiometric headphones 3 dB 500 1000 and 2000 Hz 4 dB 4000 Hz This corresponds to the followin
24. Allow ten minutes of cool down time before opening unit Abstract The Printed Circuit Board and power jack are easily removed from the handle housings The spring steel charger well contacts on the handle are spring steel and will snap when attempting to spread them too far The mini transducer speaker and sound tube are easily removed from the board without removing the board from the handle housing The rubber gasket that seals the sound tube to the AudioScope head is called Stabilizing Grommet This grommet can be changed if it leaks air Air leaks can deteriorate the performance of the instrument Air leaks are a result of rough handling and resultant broken seals in the housing halves or bad gaskets around the lens and 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 disassembly or service Turn the LOCKED OPEN knob on the bottom of the AudioScope to OPEN the two lines should meet together at the bottom Use a flathead screwdriver or coin Slide the top of the housing backwards exposing the battery and board Lift the battery out by pulling upwards on the positive end Remove the lamp by pressing the blue button on the board 4 1 2 Speaker removal Do not try to pull the sound tube out of the boot since the boot end of the sound tube is flared Gently push the speaker boot containing
25. D OR STOCKED WHICH DOES NOT PASS ALL NORMAL CYCLE CUNT NYL THAT FAILS A TEST DR CANNOT BE ADJUSTED AN ACCEPTABLE VALUE ALL 2 SHUT OFF THE SOUND PRESSURE LEVEL MEASURED AT THE EAR SIMULATOR SHALL 0 SPECIAL NOTE YELLOW L E D LIGHT FLASHING IS NORMAL DURING POWER UP THIS xo TESTS INVOLVING SOUND LEVEL MEASUREMENT SHALL BE MADE IN AN AMBIENT DROP LEAST 15 dB AFTER EACH TONE USING OCTAVE BAND FILTER OR PRECEDING INDICATES THAT THE LOW BATTERY DETECTION CIRCUIT IS WORKING SOUND LEVEL AT LEAST 10 dB BELOW THE DESIRED LEVEL BEING MEASURED dB ONE SPL REL 20uPo WITH APPROPRIATE OCTAVE FILTER AUDIBLE TEST DURING THE SOUND LEVEL MEASUREMENT TEST THE MODULE MUST BE SECURED TO A FINAL TEST A PERSON USING AN AMPLIFIER AND HEADPHONES SHALL LISTEN TO THE C HOUSING ASSEMBLY AS SHOWN 23301 AUDIOSCOPE 11 ASSEMBLY INSTRUMENT IN A QUIET ROOM ROOM SOUND LEVELS AT LEAST 10 98 BELOW THE LENS HOLDER ASSEMBLY IS ALSO ADDED LEVELS AT EACH OCTAVE BAND THE PERSON SHALL LISTEN FOR THE FOLLOWING THE SOUND MEASUREMENT EDUIPMENT SHOULD BE SET UP PER W A SPECIFICATIONS CHARGED 72301 BATTERY OR AN EXTERNAL POWER SOURCE OF 3 5040 10 V D C SHALL START STOP OF TONES APPLIED TO THE INPUT TERMINALS DF THE MODULE THE HOUSING ASSY SHALL BE COUPLED B EXTRANEOUS NOISE BETWEEN TONES ESPECIALLY HIGH PITCHED SQUEALS AN OCCLUDED EAR SIMULATOR ANS STD NU 53 29 1878 MAY BE PURCHASED FRO
26. DS ARE UNFED sts LE mer PS Q HARMON DISTORTION FOR EACH TONE EXCLUDING P PRETONE p AND INCLUDE PLATING EXWEWE 05 gt DENT D i A0098 j TEST POINT NO 2 TO GROUND THE 7 2 0 SPA FEY UUSOS J Sf kbs LOW BASS FLIER SOULS USED WHEN WAKING THS MEASUREMENT EXTERNAL THDS Gg NET ASSY_ QTY Usb ON ANGLES 1 2 DEGREE RELFOR PROD LM INTERNAL THOS 455 28 PANT APPLICATION DO NOT SCALE 10 3 8 SHEET r Ei 6 E 4 be THESE DRAWINGS ARD SPECICATION THE PROPERTY OF WELCHALLYM INC AND SHALL NK FXPKODUCED UM COPIED OR USED A9 MANUFACTURE OR SALE OF EQUIPMENT OR WITHOUT WRITTEN FIG TEST SET UP COUPLING FIXTURE MEDIUM SIZE SPECULA 243955 DH 100 EAR HOUSING ASS Y SIMULATOR 230073 501 22 E LENS HOLDER ASS Y K Jb PRESSURE TYPE 200 055 501 MICROPHONE 06200 LAMP TEST POINT 2 TEST POINTS TEST POINT 3 ELECTRONICS MODULE TEST ROINT 4 UNDER TEST AMPLITUDE 4 OCTAVE BAND FILTE AMPLITUDE AMPLITUDES OCTAVE BAND FILTER TRIMMERS AMPLITUDE OCTAVE BAND FILTER AMPLITUDE 4 OCTAVE BAND FILTER NOTE SEE SHEET 2 FOR NOTES LAMP HOLDER LAMP EJECTOR TEST POINT 1 INPUT VOLTAGE APPLIED TO THESE POINTS METRIC Are im M PLATING
27. ED ON FIG 2 DIMENSION THE TIME IN SECONDS SHOULD BE wITHIN THE TOLERANCES LISTED ON TABLE UP 1 02 UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCES ON DATE 5 5 89 DRAWN R J GAMBUZZA WELCH ALLYN SKANEATELES FALLS N Y CHECKED REPAIR RECALIBRATION TO 6 MATERIAL 1 010 APPROVED 1 005 oe FOR AUDIOSCOPE 11 REL FOR PROD DRAWING NO FINISH 6 TO 24 5 03 ABOVE 24 06 2 015 172 DEGREE DO NOT AOZO SO E 7 6 ANGLES 5 5 2 2 n 1 i AUDIOSCOPE HANOLE TEST SPECIFICATION FIG 2 POWER CONNECTIONS AT THE COMPLETION OF ASSEMBLY EACH HANDLE SHALL BE SUBJECTED TO ALL TESTS LISTED BELOW NO H NDLE SHALL SHIPPED NOR STOCKED WHICH DOES NOT MEET ALL TEST CRITERIA tl START BUTTON DE START BUTTON SHALL ACTIVATE WITH 4 FORCE OF 45 LBS t2 ON OFF SWITCH THE SLIDE SWITCH SHALL OPERATE WITH LONGITUDINAL FORCE 0 5 4 0 LBS ON AND 1 0 5 0 LBS SLIDING OFF 5 0 5 ALL L E D 5 SHALL OF SUFFICIENT SAIGHTNESS TO VISIBLE UNDER CONDITIONS OF NORMAL AMSIENT ILLUMINATION AND VIEWING ANGLE UNITS THAT ARE QUESTIONABLE MAY TESTED BY VIEWING 187 AWAY AT 50 CONICAL ANGLE WITH 40 60 FT ANDLES OF wHI
28. HE TEST PRON GROURD FGR EACH L E D THE FOLLOWIMG MEATUR M NTS ABJUSTM NTI 5 AACE THE OUTPUT FREQUENCY SINL BE WC THE 2 f TARE 15 GRADUALLY SECREASES TEST POINT NO 2 AND GROUND egt Low BATTERY HE INPUT YOL SIGNAL BETWEEN THE FREQUENCY INDICATION SHALL BE WITHIN 11 0 OP WAT SHOWN BELOW THE FREGIENCIES SHALL BE STABLE 81 DURING THE FIRST 2 SEC SELECTION DM FOR THIS TEST A FULLY CHARGED MOD 72300 TiFRY MUST ASSEMBLEO TO THE HANDLE AS SHOVE IM DWG 232002 571 JDIDMETER ASSY AND USEN 10 POWER THE MODJLA MIS AMD 4 SHALL SE CCKNECTEB TOGETHER ELECTR ALLY CYCIE tHe 1 6 0 SHOULD RELISH TRE ASOVE TEST EEQUENCT THE 93 SWITCH SHALL LE DEFAFSSED ASSIM MOMBROARILY ANE THE FOLLOWING PARAMETERS CHCCIIU DOR 4b THE NORMA THR MODULE CURRENT THE CURRENT DAAIM PROK THE 3 9 V D C VEIT WOT EXCh D 160 DURING ANY PORTION OF CYCLE SHUT OFF THE SOUMO PRESSURE LEVEL MEASURED AT THE ERR STHULATOR SMALL DROP LEAST 15 db AFTER EACH TOME SING OFTAYE BABO FILTER PRECEDING TOME SISECFALL EACH TONE NAEL RISE LAB FALL 1 GRADUAL THE RISC FALL TIRES SMALL BE 40 40 NSEC AS MEASURED BY THE DIFFERENCE THE 1 AND 20 db POINTS IN VOLTAGE AT TEST POSHT 2 THESE POINTE
29. HIEVED WITHIN THE LIMITS SPECIFIED IN THE TABLE DRAWN DATE IN FIGURE 4 REPEAT THIS STEP FOR THE 40 8 SWITCH SETTING CR WeiciyAliyn 9 9 86 NORMAL CYCLE APPROVED DATE MATERIAL THE GREEN L E D SHOULD RELIGHT AFTER THE ABOVE TEST SEQUENCE THE PUSHBUTTON R BLACK 9 12 88 SWITCH SHALL BE DEPRESSED AGAIN MOMENTARILY AND THE FOLLOWING PARAMETERS CHECKED DURING THE NORMAL OPERATION OF THE MODULE REL TO PROD DATE FINISH CURRENT DRAIN THE CURRENT DRAIN FROM THE 3 5 V D C SUPPLY SHALL NOT B CAMPAGNA 10 3 86 EXCEED 42 mA DURING ANY PORTION OF THE CYCLE TITE AUDIO MODULE III SOFTWARE CAORA TEST SPEC UNLESS OTHERWISE SPECIFIED D DRAWING NO REV Ao0985 R SCALE 1 1 SHEET 1 OF 1 Zu EL M TE T RES gt iS oT mae C 401825 __ 8 E E EE mE QM RN d A Mia an 8 2N HLZCUNTNE E 7 d mmo CS as REL ENS 1 2 22 es OC t D SOUND EQUIPMENT CALIBRATION BAND PASS FILTER TYPE 518 MEASURING AMPLIFIER TYPE SETTINGS FOR BAND PASS FILTER SELECTIVITY BANDWIDTH 1 1 OCTAVE RECORD STEP 1 3 OCTAVE RANGE 2 20 KHz A LIN DOWN FILTER CONTROL MODE MAMUAL UP RECORDER NO LIGHTS MANUAL FILTER SELECTOR 250 2 SETTINGS FOR MEASURING AMPLIFIER 2610 B 4 AUDIBLE TOME TEST IMPUT SECTION GAIN CAL
30. IBRATION gt SETTINGS FOR BAND PASS FILTER TYPE 1618 INPUT SECTION ALL THREE FILTERS OFF OUTPUT SECTION GAIN OUTPUT SECTION GAIN TEST 30 dB SETTINGS FOR MEASURING AMPLIFIER TYPE 2610 INPUT PRE AMP UP INPUT SECTION lt 1048 REF OFF DOWN C POL VOLT 200 DOWN OUTPUT SECTIOM 048 FILTERS OM SETTINGS FOR CROWN AMPLIFIER TYPE PL 2 db H SETTING 808 AVERAGING TIME FAST 45 52 DETECTOR n 5 SETTINGS FOR DATALOGGIMG MULTIMETER AWS MODEL DML 4020 SET THE METER TO THE VOLTAGE AND Rf i AS A REGULAR METER PRESCIHO TRE START BUTTON WILL PRINT OUI THe LURRENT READING ON IHE METER CALIBRATION PROCEDURE SMITH PISTON PHONE SWITCH 4220 FROM BATTERY MAKING SURE CLEAR AUDIBLE I ED THIS IS BATTERY CHECK IF INGREASE fe NOT NOTED AGE BATIERIES m IP BLACK COVEN ON END OF PISTON CAREFULLY REMOVE 1 2 MIC 4134 FROM FIXTURE PLACE SCREEN ADAPTER ON MIC IN STON PHONE ON ADJUST INPUT PHEAMP ON MEASURING AMPLIFIER TO SETTING ACCORDING TO CHART BELOW SCREEN ADAPTER IN STORAGE BOX PLACE FIXTURE AND MIC TOGETHER PLACE PISTON PHONE IN STORAGE BOX B INPUT PREAMP SETTINGS WHEN TAKING TEST READINGS THE INPUT AND OUTPUT GAIN SELECTORS SHALL BE SET 30 RESPECTIVELY AND THE MANUAL FILTER SELECTOR SHALL BE ADJUSTED TO EACH FREQUENCY AS 16 BEING TESTED
31. Level AudioScopes 23300 MICROCONTROLLER type serial no 9670000 and higher Incoming bench checks Prepare the AudioScope 3 for calibration 2 7 1 _ Check the tightness of the two slotted screws near battery positive spring 2 7 2 Check the tightness of the charger jack 2 7 3 Check that the sound tube extends at least 1 16 to 1 8 into the cavity behind the lens If it does not move it upwards with long nose pliers taking care not to bend or crush the sound tube Preparation of Sound Equipment 2 7 4 Set up your sound equipment as per AudioScope Sound Equipment Calibration and Setup Procedure A01825 Calibration Materials Required Audiometer Handle Test Specifications A00277 1 sheet This is the process Electronics Module Test Specification A00985 1 sheet These are the specifications Note A note appearing on the specification reads Exact Measurements not required for 100 inspection This note does not apply to sound settings Adjust the AudioScope according to the printed sound settings and their tolerances as shown on the print Your Sequence Original Step number from A00277 Modifications if any 2 7 5 step 1 Start Button Check for smooth operation 2 7 6 step2 On Off Switch 2 7 7 ___ step3 L E D s LED s must be bright 2 7 8 ___ step4 2 7 9 ___ step 7 Cover 2 7 10 step 8 Pneumatic Seal Check seal before sound 2 7 Calibration Procedure
32. M OR STATIC INDUSTRIAL RESEARCH PRODUCTS INC PART ND 06100 VIA A WELCH ALLYN 1 THE PERSON MAY REJECT INSTRUMENTS THAT VARY SIGNIFICANTLY FROM AN INSTRUMENT DF CARE MUST BE TAKEN PROVIDE AN ACOUSTIC SEAL BETWEEN ALI COMPONENTS KNOWN CALIBRATION QUALITY THIS TEST 15 TO BE REPEATED FOR ALL THREE SWITCH F THE LAMP SHALL BE DISCONNECTED BY DEPRESSING THE LAMP EJECTOR BUTTON SETTINGS INSTRUMENT SETTINGS FOR THIS TEST ON DWG AO1825 START UP NI BE TEN um m L E EU en TA T CB HAS NOT BEEN CALIBRATEO THEN THE PRETONE L E D FLASH THE TONE WHILE THE MODULE IS IN A 23301 AUDIDSCOPE 111 A LAMP SHALL BE INSERTED CALIBRATION PROCEDURE MUST BE DONE PRIOR TO ANY DTHER TEST INTO THE LAMP HOLDER THE LAMP SHALL CENTER ON THE FIBER OPTIC BUNDLE AND GM A ce UE M imp a UMS ITO D IM ae nome ons arin o Y 4 e E T D THE TABLE ABOVE SHOWS ACTUAL SOUND PRESSURE LEVELS REQUIRED FOR ACCURATE GREEN L E D SHOULD RELIGHT THE END OF THE CYCLE gt CALIBRATION DF WELCH ALLYN AUDIDSCOPES FOR BACKGROUND INFORMATION SEE ARTICLE TONE CALIBRATION REFERENCE THRESHOLD SOUND PRESSURE LEVELS FOR THE WELCH ALLYN AUDIOSCOPE ATTACH THE 713785 AUDIOSCOPE CALIBRATION BOX TO THE PIN HEADER THE SET POINT FOR THE 500 Hz TONE WAS CHANGED FROM 34 9 TO 35 2 dB IMPROVE B CONES ON THE HANDLE PCB Nee THE DRANGE NIRE OF THE THE MANUFACTURIBILITY OF THE UNIT WHEN USING THE 1
33. Multi Level AudioScopes 23300 MICROCONTROLLER type serial no 9670000 and higher continued 2 7 11 step 5 Sound Level Follow steps a h below a Set Run Cal switch on T 13765 to RUN position Attach AudioScope Calibration Box T 13765 to 8 pin header connector with orange wire of T 13765 connector towards crystal Turn AudioScope3 On and set to 25 dB Observe Green LED It should be lit Place the RUN CAL switch on the cal box to the CAL position The green READY light should flash The orange PT PreTone light should be on Use the 1000 Hz filter on the B amp K adjust the PreTone level 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 When desired level is set depress the SAVE amp INCR button The handle will move to the next tone to be adjusted Repeat above sequence for all remaining frequencies Select correct filter on B amp K 2 7 12 2 7 13 2 7 14 Switch unit to 40 dB Repeat above process only checking readings are in tolerance but not making adjustments Switch unit to 20 dB Repeat checking Switch the RUN CAL switch RUN position Microcontroller AudioScope3 is now calibrated and will run with new settings step 9 Charge step 10 Lamp Ejector step 11 Trained Listener Calibration is complete If AudioScope3 Microcontroller does
34. NY SORTON OF THE CYCLE 8 THE VOLTAGE IS DECREASED 3 1 V THE GREEN LE D SHOULD GO OUT AND YELLOW LE D SHOULD LIGHT THE INPUT SHOULD THEN BE INCREASED AND THE GREEN LED SHOULD RELGH AT 3 270 3 55 V ONLY ONE L E D SHOULD BE ON NATE 50 13 FLICKER B 9 amp ce ue THE PUSH TON D MOMENTARILY GREEN L E D GO OUT S SHALL ILLUMINATE SEQUENTALLY 8 WHEN EACH RED LE E LATCEED ON BY CONNECTING POINT NO 1 70 C MINAL T MAY BE UNLATCHED BY DISCONNECTING Ont FRO GROUND FOR EACH L E D THE FOLLOWING MEASUREMENTS AND ADJUSTMENTS SHALL BE MADE rev PART NUMBER DESCRIPTION OR 1 FREQUENCY THE OUTPUT FREQUENCY SHALL VEASURED BY THE ELECTRICAL SIGNAL MATERIAL FINISH 503 502 SYMBOL LIST OF MATERIAL BETWEEN TEST PON NC 2 AND GROUND Te FREQUENCY ID CATION SEAL WTHIN x s 1 0 ELI HI CI 3LE WITHIN E Hz DURING THE FIRST 2 SEC AFTER SELECTION UNLESS MIHSHMISE MMESSQESRUSE SPEGIRED WELCH ALLYN INC CR WOINGWICZ 10 8 SKANEATELES FALLS N Y U S A E FREQ H TOLERANGES ON CHECKED TONE REQ Hz METRIC DIMENSIONS WHEN s SE 2 1000 9 XXX J SAROFEEN 2 3 2000 DIMENSIONS INCLUDE PLATING UP TO 6 02 005 APPROVED 4 p REMOVE BURRS SHARP EDGES ANE 3 BACK 9 12 8 E THREA
35. ON CUMULA VE P C B SHOWN wast id es Was 12 8 87 495 17 2828 D i REV D NOTE 8 5 3 88 495 4 PUSH BUTTON ACTUATED GREEN LED BE HEHIS G REVD NOTES 3 4 7 14 88 JUS ONE H REVD NOTE zee CRW 12 8 88 495 4000Hz 500Hz 3 Y f q REV D NOTES 3 amp 9 Ex SB 7 7 94 Pe uus HOLDER aer 4 SLIDE SWITCH 51 AMPLITUDE NO 5 tem 500 Hz SWI lt 1 AMPLITUDE 4 PUSHBUTTON SWITCH S2 q Cat boo Ro NO 3 L AMPUTUDE TRIMMERS 4 AMPLITUDE NO 2 He AMPLITUDE NO 1 p PRETONE 1000 Hz n V y f AMPLITUDE a NOTES 10 NORMAL CYCLE B REFER TO AUDIOSCO E SCHEMATIC DWG 230230 FOR ALL TEST POINT LOCATIONS THE GREEN L E D SHOULD RELIGHT AFTER THE PRECEDING TEST SEQUENCE THE FOR THE PURPOSES OF THIS TEST A JUMPER BETWEEN EST PONT NO 1 AND GROUND PUSHBUTTON SWITCH SHALL BE DEPRESSED AGAIN MOMENTARILY AND THE FOLLOWING NEGA TERMNA BE USED LATCH EACH TONE FOR PURPOSES OF PARAMETERS CHECKED OURING THE NORMAL OPERATION OF THE MODULE RISE FALL TIME EACH TONE SHALL RISE AND FALL IN AMPLITUDE IN GRADUAL MANNER THE RISE AND FALL TIMES SHALL BE 60 40 mSEC AS MEASURED BY THE DIFFERENCE BETWEEN THE 10 80 POINTS IN VOLTAGE AT TEST POINT NO 2 2 AN AUDIO AVBLEIER AND SPEAKER ARE CONNECTED 70 THE OUTPUT TERMINALS SEE FIGURE 1 THE ACTUAL RISE FALL TIME NEED ONLY BE VERIFIED ON
36. ONE TONE 5 TIMING THE DURATION OF TONES AND PAUSE BETWEEN THEM AS SHOWN IN FIGURE 1 3 THE FIVE AVPLITUDES ARE SET TO THE FOLLOWING VOLTAGE SHALL BE CHECKED THIS CAN BE MEASURED BY THE ELECTRICAL SIGNAL BETWEEN H TEST POINT NO 2 AND GROUND G FREQ z QUTPUT 7 2 TOLERANCE RMS mV RMS AN ALTERNATE WAY OF CHECKING THE TIMING IS TO PROBE PIN 14 THE LC THIS WILL BE DIGITAL SIGNAL WITH THE DURATION OF THE HIGH PULSE BEING Q Bus 00 u THE TONE ON TIME AND THE DURATION OF THE LOW PULSE BEING THE OFF TIME 2000 185 25 11 SECOND CYCLE 500 50 5 THE MODULE SHALL BE PUT THROUGH ANOTHER CYCLE BY ACTUATING THE PUSHBUTTON SWITCH TO TEST THE RESTART FUNCTION 4 THE SLIDE SWITCH S1 IS TURNED ON TO THE 40 dB LEVEL SETTING THIS 5 SWITCH POSITION CLOSEST TO 7 OW L ED RESTART AT ANY POINT DURING THE CYCLE THE PUSHBUTTON SWITCH IS DEPRESSED ANY LED THAT WAS LIT SHOULD GO QUT AND THE NORMAL SEQUENCING SHOULD THE GREEN L E D SHOULD LIGH START OVER THE START BUTTON 52 IS PUSHED 52 5 SHOULD ILLUMINATE SEQUENTALLY THE DURATION OF THE ES ELY 1 5 SEC THE INTERVAL BETWEEN TONES IS VARIED AS SPECIFIED ON FIGURE 1 AN AUDO TONE SHOULD HEARD WHEN EACH LE D OF VARIED AMPLITUDE AND OR FREQUENCY AT THE END UE LED SHOULD RELGHT TRE TIME BETWEEN GF TEE SUSHBLT ON AND THE GREEN LED SHALL AS SHOWN FIGURE 1 INPUT CURRENT SHALL NOT EXCEED 30 mA DURING A
37. Repair T19102 2 Repair M 31446 Repair M 30313 Testing T 3769 holds AudioScope T 1539 Holds AS to DB 100 assembly T 1393 Holds Tones T 9783 Holds Microphone to DB 100 T 2011 T 13765 charging jack ring nut tool T 10912 27 2 3a Lists of Tools Fixtures Documents for Service and Calibration Drawing Description Size sheets A02030 Repair Calibration Spec for AudioScope 1 of 1 A00277 Audiometer Handle Test Specifications D 1 of 1 A00984 P C B Test Spec AudioScope D 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 Sound Equipment Calibration and Setup C 1 of 1 A00942 Charging Stand Electrical Test Spec A 1 of 1 230230 Audio Il Schematic PCB for ASIC version D 1 of 1 230215 PC Board Ass y for ASIC version D 1 of 1 236630 PCB Schematic for Microcontroller version B Parts catalog pages 230137 3 Nos 23000 23020 23040 AudioScope A 1 of 1 230237 1 No 23300 AudioScope and 3 A 1 of 1 711408 2 No 71123 Charging Stand A 1 of 1 2 3b Tools and Fixtures Setup for Calibration AudioScope and AudioScope 3 s n 969999 ASIC Figure 2 3b Calibration Set up for AudioScopes with ASIC 29 2 3c Tools and Fixtures Setup for Calibration AudioScope 3 s n gt 970000 Microcontroller 2 4 Training The AudioScope is a sophisticated audiometric device and must be serviced an
38. TE LIGHT ILLUMINATION ON THE CONTROL PANEL SEE FIGUI 1 THE UNIT 15 ACCEPTABLE IF ALL L E D S ARE VISIB AT ALL ANGLES 4 RATTLE THERE SHALL BE NO PERCEIVABLE NOISE GENERATED WHEN THE HANDLE 15 SHAKEN 5 SOUND LEVEL THE SOUND LEVEL OF ALL TONES SHALL BE RECHECKED PER THE SPECIFICATIONS Q7 490275 LAUDIORCORE 1 OR AOQ985 Abbr oscoF PE 11 ELECTRONICS MODULE TEST SPECIPICATION M ASURED LEVELS SHALL BE WITHIN 21 12 0 dB a 4000 Hz AUDIOSCOPE 1 OR 31 0 1 5 48 4000 500 Hz AUDIOSCOPE 11 ie odejo LEVELS SOUND LEVEL SHALL NOT BE READJUSTED TO MEET THIS SPECIFICATION Roses VOLTAGE POINTS 7 COVER THE COVER SHALL SLIDE ON AND OFF AND LOCK IN POSITION WITHOUT UNDUE FORCE 8 PNEUMATIC SEAL THE INSTRUMENT SHALL BE CONNECTED TO AN AIR SOURCE WHICH GENERATES 200CC MIN FLOW UNOCCLUDED AND i H PRESSURE WHEN OCCLUDED THE SEAL 15 ACCEPTABLE IF THE PRESSURE DEVELOPED EXCEEDS 254 H20 WITH THE INSTRUMENT CONNECTED SEE FIGURE 4 THE INCLUDED AIR VOLUME OF THE TEST TH CHARGING CURRENT et IVERED TO THE OULD BE 75 109 mA AS MEASURED ON D C AVERAGING METER YSTEM SHOULD BE MINIMIZED 9 CHARGE THE UNIT SHALL NOT OPERATE WHEN THE CHARGER 16 CONNECTED WITH INPUT OF 120 2 60 Hz TO A MODEL 71040 SEE FIGURE 5 10 LAMP EJECTOR SEE TEST 00273 AUDIOSCOPE I OR 00985 11 TRAINED LISTENER
39. TIVE H Res 10 TAMEO IN FIGURE 2 2848 JUS 4 ADD D SPECIAL NOTE 42 ws aie FORD BOPTN GREEN L E D RE LIGHTS er 5 12545 uoc MODEL 4134 a 1 2 PRESSURE Feo Via unc TYPE MICROPHONE ETONE N NOTE FOR TONE CALI 1000Hz 1000Hz 2000Hz 4000Hz L3 2 uoc P RRE GESTE EN oa e 11393 DWG NO 33500771 A E z 54 STE 0 LAMP LAMP EJECTOR WITCH SLIDE SWITCI p 17 5 0 5 zd n PUSHBUTTON 5 _ SWITCH ides 8 PIN HEADER FIGURE 4 ACCEPTABLE LEVELS IIIS NUS FOR QC PURPOSES 48 HL LEVEL PRETNE e 1000 Hz 1000 2000 4000 500 Hz BN MU 5 22227 ane TIERE iie Waa aoe dBHL PRETONE 1000 Hz _ 2000 Hz 4000 Hz 500 Hz 20 48 3 48 3 26 3 28 3 31 2 34 2 2 0 35 28 2 31 8 p OK oF MAK STILL BE siet TO re MIN OF 37 0 43 m 25 51 3 53 3 31 3 33 3 26 2 38 2 27 0 40 8 33 2 36 6 n 9 C1 dB 40 86 3 68 3 46 3 48 3 51 2 54 2 52 0 55 8 48 2 51 6 T MIPLITUDE A D Pal CREE 4 VALI VOLTAGI NI LAYE Hi 8 DM 4020 DIGITAL READOUT nt INPUT VOLTAGE APPLIED UU E NOTES BELOW THE CALIBRATION PROCEDURE MUST BE DONE PRIOR ANY OTHER TEST MODULE SHALL StIPRE
40. WelchAllyn Service Manual AudioScope AudioScope 37 Screening Audiometers Single Hearing Level Models 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 State Street Road P O Box 220 Skaneateles Falls NY 13153 0220 PN 230260 Rev B Copyright 2004 Revision History ECN ECO Revision Section Title Author Description m m EUN Intro of Document Intro of Document Intro of Document 5 32904 5 31 96 4 3 32904 A 5 31 96 Intro of Drawings Specs Added Soldering Temperatures Document F Drawings and or illustrations and or part numbers in this document are for reference only For the most current revision call the Welch Allyn Customer Service phone number listed in Section 1 Table of Contents Sub Sect Pg Cover Page 1 Revision Page 3 Table of Contents 4 5 SECTION 1 General Information To Service Personnel 1 1 7 Limited Warranty 1 2 8 Introduction to AudioScopes 1 3 9 11 Figure 1 3 AudioScope Handle Controls 13 11 Basic System Description Fig 1 4a Basic System 1 4a 12 Basic System Description charging stand 1 4b 12 Use of the AudioScope Screening 1 5 13 14 Operating Program 1 Lev Fig 1 6 Block Diagram 1 6 15 17 Operating Program 3 Lev s n 969999 ASIC 1 7a 18 20
41. amen mo 3 2 87 295 fees ore or lasan ee FOUR CORMER LEADS CLINCHED INWARD ON THE 1 De lem aero u 771797 t 7 view 5 5 7 10 67 ALL COMPONENTS EXCEPT FOR RS RO Swi 542 BE WAVE SOLIER ATTACHED RAS Dr LSIN THE APPROPRIATE SOLDER PASTE Sw AND Sw2 ARE TO v ATTACHED AFTER WAVE AND REFLOW ING AND CLEANING OP RATIONS HAVE BEEN amen Ssawa 1001 SWITCH LUBRICANT TO APPLIED TO PCB UNDER SWIT MECHANISM APPLY O 2CC LUBRICANT 30 57 5 AOLEQUS BASE FLUX 15 70 BE USED DURINO THE SOLDERING OPERATIONS AND FU m AN ous ux 1S 1 Ux REMOVAL AFTER SOLDERING SHOULD DONE WITH AN ADUEDUS BASED CLEANING 255210 al 1075707 SOLUTION THAT THE ASSEMGLY 15 FREE OF ANT HESIDUAL CLEANING FLUID s Revo E ulao 230218 amp 12 8 87 1709 NO 7 ARE BE SOLDER ATTACHED STO 00740 T reve nove z wore 16 P TIC SOLDER THESE COMPONENTS CANNOT BE WAVE SOLDERED HAND SOLDERING DRAT ION 15 FECOREMED jowan ros 4 25 25021 A 09 La Se TEST ASS Y PER Gr e
42. ce Tone PT the AudioScope3 provides screening at all four speech frequencies 1 000 Hz 2 000 Hz 4 000 Hz and 500 Hz This test can be performed at one of three hearing levels 20 dB 25 dB or 40 dB Selection of the hearing level is dependent on the age of the patient Note there is no PT with single level AudioScopes If a hearing problem is suspected the patient is referred to a specialist for diagnosis The AudioScope contains a 3 5 volt halogen lamp and otoscope lens for viewing the tympanic membrane and the ear canal prior to and during hearing screening There are two types of Welch Allyn AudioScopes in use today The first type is the single hearing level instrument of which there are three models Although they are obsolete they can still be calibrated if 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 three hearing level MultiLevel AudioScope3 Also known as AudioScope There are two versions of this second type AudioScope3 pn 23300 20 25 40 dB 1000 Hz PT The original version of the AudioScope 3 three hearing level up to and including serial number 969999 utilizes an ASIC module This instrument is calibrated by adjusting miniature potentiometers on the printed circuit board Although the main board ASIC is being phased out at the time of th
43. d calibrated by trained They must possess demonstrated skills in this area using specialized and calibrated sound measuring equipment This Service Manual is the basis for delivering competency based skills training to technicians or service engineers who already possess knowledge and skills in the use of electronic equipment as listed in the specialized test equipment Section 2 3 They must also be able to properly use certain commercially available equipment and hand tools for diagnosis calibration assembly and board level repairs of the AudioScope and charger base See Fig 2 3 This manual provides specific information for diagnosing repairing calibrating and testing the 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 familiarization and repair practice Read each complete repair step before starting hands on practice Use this manual for Group Training The technician will acquire and retain service information and service skills for the AudioScope product because of well prepared and executed training sessions Conduct detailed demonstrations of required repair tasks then allow time for supervised practice Set up sessions to allow the trainee time to individually practice all repair procedures Evaluate trainee progress by observing trainee performance and then recording it on the appropriate for
44. e manufacturer s recommendations or if repaired by other than a Welch Allyn or authorized agent This warranty can be extended to a three year period provided the instrument is returned for recalibration annually Submission of instrument registration card is required Purchase date determines warranty and recalibration requirements No other express warranty is given To receive service assistance or to ask questions regarding this warranty please call or write Welch Allyn Product Service Dept Welch Allyn Inc Medical Products Division 4341 State Street Road Skaneateles Falls New York 13153 USA 1 800 669 9771 or 315 685 4445 Note U S Occupational Safety and Health Administration OSHA recommends that audiometers be calibrated annually Arrangements for calibration can be made by returning the instrument registration card In addition a daily biological check may be performed This is accomplished by a person with known normal hearing who listens to the tones for intensity and quality There is a moderate fee for recalibration Re printed from PN230108 Instrument Registration Card 1 3 Introduction to AudioScopes The Welch Allyn AudioScope audiometer enables the practitioner to perform a fast painless and objective test for early hearing loss The AudioScope3 starts with a Practice Tone PT of 1 000 Hz at a dB HL dependent upon the selected Screening dB HL Refer to Page 5 of Operating Instructions After the Practi
45. ear safety glasses and provide adequate ventilation when using adhesives accelerators and RTV adhesive sealants Read and follow all appropriate recommendations in corresponding MSDS sheets 25 2 2 Repair Parts for AudioScopes Note Order parts from most recent Bill of Materials Repair The attached bill of materials shows replacement parts which are available from Welch Allyn Part number 711427 501 711413 711419 501 711418 501 711421 711420 230035 2 230038 230029 1 200055 502 230073 505 230080 502 230201 501 710205 72300 06200 Description Housing assembly Charging stand Holder f handle amp specula Rubber feet set of 4 Base plate assembly Mounting hardware kit 6 x 3 4 PHPS HD screw self tap Miniature transducer Transducer boot Stabilizing grommet Lens holder assembly Housing assembly Cover assembly Electronics module assembly AS3 Power jack 3 5 volt rechargeable battery 3 5 volt halogen lamp Single level AudioScope modules pn 230001 501 are No longer Available 26 2 3a Lists of Tools Fixtures Documents for Service and Calibration The U S Occupational Safety and Health Administration OSHA recommends that audiometers be calibrated annually Arrangements for calibration can be made by returning the instrument registration card In addition a daily biological check may be performed This is accomplished by a person with known normal hearing who listens to the tones for
46. eet Re 779799 235 x REVEED 2x09 4 FER WS ZXQDIA 230207 ITEMS 4 5 TO PC BOAPD THIS LOCATION USING LOCTITE 416 M30336 m MEE 5 AB 230236 3 5 D ag gt c e ce aff N PROTRUSIONS AR TER REMOVAL PROM ARRAY ALLOWED ON SORT UY BE PEDE IN FOR A MINIMUM OF 24 HOURS MEET pu s Fo 0 gao 15 UNIT e A ANODE OF LED S LONGER LEAD TO BE LOCATED IN THESE LOCATIONS eo a ANY VENDOR LOT OR PUN LABELING MAY BE LOCATED IN THIS WITH ASSEMBLY NO DASH NO REVISION LETTER AND DATE YYww e e A ITEMS 4 AND 5 FLUSH AGAINST CARD BETWEEN SOLDERED END AND TACK LOCATION v ITEM 10 LAMP EJECTOR INTO PLACE BY SPREADING PRONGS OF ITEM 7 e 45 LAMP HOLDER 17 ASSEMBLY 15 TO CONFORM TO IPC 810 150 WORKMANSHIP STANDARDS L E D MOUNTING DETAIL L 90 m X MAN oce tris ows 502 BOARD 55 ore ary ary E PART DESCRIP 10 rma 2 ex mei LIST Of MATERIAL WELCH ALLYN INC SKANEATELES FALLS N Y U S A PC BOARD ASS Y comte mgr 23
47. g absolute sound pressure levels when the instrument is coupled to an occluded ear simulator per ANSI Std No 53 25 1979 Freq For 20 dB HL for 25 dB HL for 40 dB HL 500 28 2 31 6 33 2 36 6 48 2 51 6 1000 26 3 28 3 31 3 33 3 46 3 48 3 2000 31 1 34 2 36 2 39 2 51 2 54 2 4000 32 0 35 8 37 0 40 8 52 0 55 8 Lamp 3 5v Halogen 20 hr avg life Battery 3 5v nickel cadmium rechargeable pn72300 650 mA hr Continuous use 50 minutes approx between full charge 23 Section 2 Service 2 1 Intent of Service Manual This manual provides technical assistance to trained service personnel for diagnosing repairing calibrating testing the AudioScope handle and Charging Stand and replacing parts listed in Section 2 2 See the table of contents for a complete listing of manual contents Welch Allyn part numbers PNZ and material numbers MZ appearing in this manual are current at the date of publication Order replacement parts by referencing your latest bill of materials or 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 to the manual Caution prior to doing repair work unplug power cord on charger to eliminate shock hazard Use grounding mat and grounding strap to reduce chances of damage to ASIC in handle Caution when using adhesives Always w
48. gher Multi Level AudioScope3 Microcontroller non ASIC Sequence Cause 1 Manual Switch ON 2 Manual Press START 3 Logic 04 pin 9 goes to 3 V 4 Logic 04 pulses pin 4 U4 sequentially toggles pin 19 20 21 22 Effect Lamp ON Ready LED ON MICRO activated activates PT PreTone LED D3 U4 ramps U5 digital pot to calibrated level This establishes feedback resistance for U3C Generates digital base amplitude 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 04 pulses pin 4 U4 sequentially toggles pin 19 20 21 22 6 Logic U4 pin 7 goes to 3 V U4 pulses pin 4 U4 sequentially toggles pin 19 20 21 22 activates 1000 Hz LED D4 U4 ramps U5 digital pot to calibrated level This establishes feedback resistance for U3C Generates digital base amplitude sinewave at pin TP10 activates 2000 Hz LED D5 U4 ramps U5 digital pot to calibrated level This establishes feedback resistance for U3C Generates digital base amplitude sinewave at pin TP10 21 1 7b Operating Program 23300 Microcontroller type serial no 9670000 and higher continued Multi Level AudioScope3 Microcontroller non ASIC Sequence Cause 7 Logic U4 pin 6 goes to3 V 04 pulses pin 4 U4 sequentially toggles pin 19 20 21 22 8 Logic U4 pin 5 goes to 3 V 04 pulses pin 4 U4 sequentially toggles pin 19 20 21
49. hat three tabs line up with components Restore connections by soldering using T19102 2 three components to tabs on jack 4 1 8 Place board into housing Place the switch on the housing on the off position Place the switch mounted on the circuit board to the 40 dB position toward the yellow LED Position the sound tube gasket into the hole in head of the instrument The 5 16 round rubber ring will line up with the end of the fiber optic bundle Gently push the board back into its original position The tab of the switch will engage the cavity of the switch button 44 4 1 Disassembly Procedure AudioScope3 continued Prepare the unit for functional check and calibration Place a known good lamp into the unit Perform full functional check per A specifications Check frequency and amplitude Calibrate unit Place a known good charged battery into the unit 45 4 2 Disassembly Procedure Charging Stand Abstract The Charging Stand disassembles to three main components the base plate the holder and the housing assembly If the internal circuit board fails replace the housing assembly Bent charging contacts cannot be replaced since they are heat staked into the housing assembly 4 2 1 Prepare charger stand unit for disassembly charging transformer from mains Remove specula 4 2 2 Base plate assembly removal Unscrew four screws holding the base plate assembly to the housing assembly
50. in 21 to Ov this charges C5 activates LED 1000 Hz LED selects resistance between pins 7 of U2 and ground produces 1000 Hz sine wave at pin 2 of U2 this resistance is adjusted for the output amplitude of the 1000 Hz tone only and 15 used to control output amplifier U3 activates LED 2000 Hz LED selects resistance between pin 7 of U2 and ground produces 2000 Hz sine wave at pin 2 of U2 16 1 6 Operating Program 23020 23000 23040 Single Hearing Level AudioScope continued Sequence 6 Logic 7 Logic 8 Manual Cause UA also selects resistance between pin 17 of U4 and pin 5 of U3 pin 3 goes to Ov 04 pulls pin 1 to Ov this charges C5 04 also selects resistance between pin 16 of U4 and pin 5 of U3 cycle completes itself switch off Effect this resistance is adjusted for the output amplitude of the 2000 Hz tone only and is used to control output amplifier U3 activates LED 4000 Hz LED selects resistance between pin 7 of U2 and ground produces 4000 Hz sine wave at pin 2 of U2 this resistance is adjusted for the output amplitude of the 4000 Hz tone only and 15 used to control output amplifier U3 Ready LED illuminates unit deactivates lamps amp logic off 17 1 7a Operating Program 23300 ASIC TYPE up to and including serial no 9609999 Multi Level AudioScope3 asic The Three Hearing Level AudioScope3 up to and including Serial Number 960999 u
51. is writing they can still be calibrated if they are functioning according to specifications Some parts are available See Repair Parts Section 2 2 NEW VERSION A new version starting in 1996 with serial number 967000 differs from the first AudioScope3 in that a Microcontroller is used instead of the ASIC Performance specifications of the new AudioScope 3 are identical to the earlier AudioScope 3 and the part number remains the same Since this version utilizes a Microcontroller with digitally adjusted pots and not mechanical potentiometers calibration is much easier Tool T 13765 is used to electronically adjust the board This advance eliminates the limitations of mechanical potentiometers and reduces calibration time 1 3 Introduction to AudioScopes The operation and calibration of all five of these screening audiometers are explained in this manual Important note to Service Personnel Board Replacement on AudioScope 3 Welch Allyn manufactures only the AudioScope3 as of Oct 1986 As of 1996 starting with serial no 967000 a new version AudioScope3 utilizes a Microcontroller does not have ASIC and is calibrated using the T 13765 Calibrator Box It has digital 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 ASIC fails on an AudioScope 3 the whole board will be replaced with the
52. m Each trainee must have the opportunity to practice the procedure s after the instructor has demonstrated it Tell them how and why Show them how with explanations Provide for supervised practice trainees Record results and conduct follow up training as necessary 31 2 5 Calibration Procedure Single Level AudioScope Incoming bench checks Prepare the AudioScope for calibration 2 5 1 Checkthe tightness of the two slotted screws near battery positive 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 If it does not move it upwards Use fingers Long nose pliers could bend or crush the sound tube See Figure 2 5 4 below Preparation of Sound Equipment 2 5 5 Set up your sound equipment as per AudioScope II Sound Equipment Calibration and Setup Procedure A01825 2 5 Calibration Procedure Single Level AudioScope Calibration Materials Required Audiometer Handle Test specification A00277 1 sheet This is the process Electronics Module Test Specification A00273 2 sheets These are the specifications Note A note appearing on the specification reads Exact Measurements are not required for 100 inspection This note does not apply to sound settings Adjust the AudioScope according to the printed sound settings and their tolerances as
53. not take calibration proceed to troubleshooting section After repair of the AudioScope3 calibrate 37 Section 3 Troubleshooting 3 1 Troubleshooting AudioScope 3 s n lt 969999 ASIC Complaint Corrective Action Unit does not turn on Low battery voltage Substitute with charged test Green LED does not light battery and retest Replace battery Retry If green LED remains unlit replace board Cold solder joint at battery Restore connection by terminal reflowing joint using T19102 Defective contact in power jack Replace power jack will not close when charge plug is removed Low battery voltage Defective power jack Replace housing D Defective charging circuit Inspect circuit Restore Speaker does not produce Cold solder joint at speaker or Restore connection by tones wire to PCB reflowing joint using T19102 Defective speaker Replace speaker No voltage at TP2 Replace Board 4 K range does not calibrate Defective speaker Replace Speaker If still does not cal replace PCB and retest Housing fails air seal test Gasket not seated correctly Remove lens assembly and rotate 180 degrees Reinstall and retest il Leaking Lens Gasket Replace housing 11 Defective housing Replace housing Halogen lamp does not light Low battery voltage Recharge or replace battery Handle does not charge Bent or broken charging Re shape contact s contacts in charging well Replace Housing Assembly
54. r available If this circuitry fails the Single Level AudioScope is 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 See Fig 1 6 Block Diagram of Welch Allyn AudioScope SINGLE HEARING LEVEL AudioScope models 20 25 40 dB use same basic circuitry except for the value of R 21 and the adjustments on VR2 Model Ohms of R21 20 dB AudioScope 11 Ohms 25 dB AudioScope 20 Ohms 40 dB AudioScope 130 Ohms AudioScope Service Manual 1 6 1 6 Operating Program 23020 23000 and 23040 Sequence 1 Manual 2 Manual 3 Logic Single Hearing Level A Cause Switch ON Lamp Press START pin 11 goes to Ov 04 pulls pin 20 to Ov this charges C5 UA also selects resistance between pin 14 of U4 and pin 5 of U3 udioScope Effect ON Ready LED ON 04 activated activates LED 500 Hz LED selects resistance between pin 7 of U2 and ground produces 500 Hz sine wave at pin 2 of U2 this resistance is adjusted for the output amplitude of the 500 Hz tone only and 15 used to control output amplifier U3 Process repeats for the 1000 Hz 2000 Hz and 4000 Hz tones 4 Logic 5 Logic pin 4 goes to Ov 04 pulls pin 22 to Ov this charges C5 04 also selects resistance between pin 15 of U4 and pin 5 of U3 pin 12 goes to Ov 04 pulls p
55. rging Stand Electrical Test Spec A 1 of 1 230230 Audio Il Schematic PCB for ASIC version D 1 of 1 230215 PC Board Ass y for ASIC version D 1 of 1 236630 PCB Schematic for Microcontroller version B Parts catalog pages 230137 3 23000 23020 23040 AudioScope A 1 of 1 230237 1 23300 AudioScope and 3 A 1 of 1 711408 2 No 71123 Charging Stand A 1 of 1 Section 1 General Information 1 1 To Service Personnel Read and understand the AudioScope operating instructions manual pn 230231 2 The information in this Service Manual is subject to change without notice and should not be construed as a commitment by Welch Allyn Welch Allyn assumes no responsibility for any errors that may appear in this manual Who to contact If the product and or its operation varies significantly from any description therein please contact Welch Allyn Medical Products Division Product Service Department 4341 State Street Road Skaneateles Falls NY 13153 0220 U S A Phone 315 685 4445 or 800 669 9771 Fax 315 685 4653 This product has been designed to provide a high degree of safety and reliability However we cannot guarantee against the deterioration of components due to aging and normal wear service and repairs must be done by authorized Welch personnel agents using approved Welch Allyn replacement parts and approved process materials Failure to do so will invalidate the product warran
56. ses an ASIC single application specific integrated circuit Microprocessor This component is not a service part If the ASIC Microprocessor should fail it will be necessary to replace the Circuit Board ASIC assembly with the new Microcontroller based circuit board Part No This is an easy replacement and does not affect unit operation Calibrate the Microcontroller based AudioScope3 with T 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 amplitude is determined by SW2 which selects one resistor for a hearing level of 20 25 or 40 dBs respectively Operation begins with switching the unit ON The examination halogen lamp illuminates immediately When the start button is depressed the AudioScope begins to generate a sequence of tones starting with PT of 1000 Hz which is 20 dB higher than the manually selected specific hearing level Then the 1000 Hz 2000 Hz 4000 Hz and 500 Hz tones are generated in that order at the same hearing level When the cycle is complete the AudioScopes returns to the ready state indicated by the Green Ready LED The whole cycle is completed in less than 20 seconds 18 1 7a Operating Program 23300 ASIC TYPE up to and Sequence 1 Manual 2 Manual 3 Logic including serial no 9609999 Multi Level AudioScope3 asic Cause Effect
57. shown on the print Your Sequence Original Step number from A00277 Modifications any 2 5 6 ___ 1 Start Button Check for smooth operation 2 5 6 step 2 On Off Switch 2 5 7 step 3 L E D s LED s must be bright 2 5 8 ___ 4 Rattle 2 5 9 7 step 7 2 5 10 step 8 Pneumatic Seal Check seal before sound 2 5 11 step 5 Sound Level 2 5 12 step 9 Charge 2 5 13 step 10 Lamp Ejector 2 5 14 step 11 Trained Listener Calibration is complete If Single level AudioScope does not take calibration unit is not serviceable Customer should be advised that unit is obsolete parts are not available Lamp battery and charging system can be used on new AudioScope 3 33 2 6 Multi Level AudioScopes AudioScope 23300 ASIC TYPE up to and including serial no 9609999 Incoming bench checks Prepare the AudioScope for calibration 2 6 1 Checkthe tightness of the two slotted screws near battery positive spring 2 6 2 _ Check the tightness of the charger jack 2 6 3 Remove RTV from the potentiometers 2 6 4 Check that the sound tube extends at least 1 16 to 1 8 into the cavity behind the lens If it does not move it upwards with long nose pliers taking care not to bend or crush the sound tube See Figure 2 5 4 Preparation of Sound Equipment 2 6 5 Set up your sound equipment as AudioScope II Sound Equipment Calibration and Setup Procedure A01825 Calibration
58. ty Please refer to the product warranty for specific coverage USING ADHESIVES ALWAYS WEAR SAFETY GLASSES AND PROVIDE ADEQUATE VENTILATION WHEN USING CA ADHESIVES CA ACCELERATORS AND RTV ADHESIVE SEALANTS READ AND OBEY WARNINGS CAUTIONS INSTRUCTIONS AND RECOMMENDATIONS PRINTED ON CONTAINER AND CORRESPONDING MSDS SHEETS CAUTION PRIOR TO DOING REPAIR WORK UNPLUG POWER CORD ON CHARGER TO ELIMINATE SHOCK HAZARD USE GROUNDING MAT AND GROUNDING STRAP TO REDUCE CHANCES OF DAMAGE TO ASIC IN HANDLE 1 2 Limited Warranty Welch Allyn warrants the AudioScope when new to be free of defects in material and workmanship and to perform in accordance with the manufacturers specifications for a period of one year from the date of purchase from Welch Allyn or its authorized distributors or agents Welch Allyn will either repair replace or recalibrate any components except lamps found to be defective or at variance from the manufacturer s specifications within this time at no cost to the customer except for transportation expenses For rechargeable batteries warranty is extended to two years It shall be the purchasers responsibility to return the instrument directly to Welch Allyn or to an authorized distributor agent or service representative This warranty does not include breakage or failure due to tampering misuse neglect accidents modification or shipping This warranty is also void if the instrument is not used in accordance with th
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