Welch Allyn Micro Tymp 1 Service Manual
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Welch Allyn Micro Tymp 1 Service Manual

Welch Allyn Micro Tymp 1 Service Manual

Tympanometric system
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SERVICE MANUAL
Micro Tymp
Tympanometric System
23600 handle, 71130 printer charger
Copyright 1995
Welch Allyn Co.
Welch Allyn
4341 State Street Road
P.O. Box 220
Skaneateles Falls, NY 13153-0220
Service manual pn236261 Rev.D 6/95
originator: RJS
ECN#5-30727
pg 1

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Summary of Contents for Welch Allyn Micro Tymp 1

  • Page 1 SERVICE MANUAL Micro Tymp Tympanometric System 23600 handle, 71130 printer charger Copyright 1995 Welch Allyn Co. Welch Allyn 4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220 Service manual pn236261 Rev.D 6/95 originator: RJS ECN#5-30727 pg 1...

  • Page 2: Table Of Contents

    Micro Tymp 1 Service Manual Table of Contents SECTION 1: General Information ..... Sect. To Service Personnel ......Limited Warranty ........Basic System Description ....... Basic System Operation (Fig.1) ..... Block Diagram of MT 1 Program ..Specifications.......... SECTION 2: Service Repair Methodology &...

  • Page 3: Section 1: General Information

    Welch Allyn, Inc. Welch Allyn assumes no responsibility for any errors that may appear in this manual. If the product and/or its operation varies significantly from any description herein, please contact: Welch Allyn Medical Products Division Technical Service Department, 4341 State Street Road, Skaneateles Falls, New York, 13153-0220, U.S.A., (315) 685-4445,...

  • Page 4: Limited Warranty

    Welch Allyn or its authorized MicroTymp distributors or agents. Welch Allyn will either repair, replace or recalibrate any components found to be defective or at variance from the manufacturer’s...

  • Page 5: Basic System Description

    Section 1.3 General Information Introduction The Welch Allyn Micro Tymp Tympanometric System enables the practitioner to per- form an objective test of the middle ear function. It provides fast and painless measure- ment on prevalent disease. Results appear instantly on the liquid crystal display and can be stored and printed in the Printer/Charger.
  • Page 6 Section 1.4 General Information FIGURE 1-1...BLOCK DIAGRAM OF WELCH ALLYN MICRO TYMP. Operation Insert the Micro Tymp handle into the patient’s ear. Press the tip firmly against the ear canal opening to insure seal. Push START/RUN button. Micro Tymp automatically measures and displays results on the LCD.
  • Page 7 Section 1.5 General Information MICRO TYMP 1 OPERATING PROGRAM PUSH BUTTON, MT 1 ACTIVATES PROPER PRESSURE READING . . . DISPLAY PRESSURE RANGE ERROR (50-CF) . . . LEAK SYMBOL LOWER (40-50) . . . SLOW FLASH BLOCK SYMBOL COMPLIANCE READING AT FULL LEVEL LOWEST (<40) .

  • Page 8: Specifications

    7 Section 1.6 General Information Specifications The specifications for the Welch Allyn Micro Tymp are as follows: Printer Charger base Power requirements: Model#: Input-volts/amps voltage range 71130 120/.1 110-130 71132 230/.06 210-250 71133 100/.11 90-110 71134 230/.06 210-250 71136 230/.06...

  • Page 9: Section 2: Service

    Section 2.1 Service Repair Methodology: This manual provides technical assistance to Welch Allyn Inc. authorized service representatives for diagnosing, repairing, and testing the Micro Tymp handle and printer charger base and replacing parts as listed below. The manual covers: fault/cause analysis tables, step by step disassembly / reassembly procedures, repair, adjustment, and re-test procedures.
  • Page 13 GROUND MAT GROUNDING STRAP FOR TECHNICIAN TWEEZERS (STRAIGHT) SMALL DRILL BIT SET COTTON TIPPED SWABS (LINT FREE) WELCH ALLYN CUSTOM TOOLS AND MATERIALS:QUANTITY REQUIRED: T-3281 TYMP CALIBRATOR (includes dual power supply and leads) T-5657 PRESSURE APPLICATOR BOX T-5609 TYMP HOLDING FIXTURE T-5744 FIXED CAVITY 5 piece set includes:.2 cc, .5 cc, 1 cc, 2 cc, 3 cc...
  • Page 14 Section 2.3 Service Training When reading this manual for the first time, have a Micro Tymp 1 and Printer/Charger base available for reference and practice. But first, read each complete repair step on what to do and how to do it before starting the repair or practice.

  • Page 15: Calibration Procedure

    LABEL. BREAK THE ADHESIVE JOINTS. DO NOT PULL THE HOUSINGS COMPLETELY APART SINCE THE FLEX CIRCUIT AND THE HOSE ARE JOINED AT BOTH HOUSINGS. PLACE THE MICRO TYMP 1 HANDLE INTO FIXTURE T-5609. Step 2 PERFORM CURRENT DRAIN TESTS: (taken from A01785 Note #8) 64mA MAX CURRENT DRAIN AT +7.2 VOLT SUPPLY IN FAST BLINKING OPEN MODE, UP TO 200mA MAX...
  • Page 16 Section 2.4 Service MT 1 CALIBRATION PROCEDURE Step 4 CONTINUED..ORIGINAL PCB COMPLIANCE TEST: (taken from A-00848 SHEET 1 OF 2, ITEM #6,TABLE 1 AND 2.) (3 VDC STILL CONNECTED) WITH SWITCH 1 OPEN, AND COUPLED TO A 2cc CAVITY, TEST POINT 3 (BLACK WIRE) SHALL BE SET TO 3.0 VDC +/- .05 BY ADJUSTING R33.
  • Page 17 Section 2.4 Service MT 1 CALIBRATION PROCEDURE Step 4 CONTINUED..PCB+ COMPLIANCE TEST: (taken from A-01785, Note 6 referring to Tables 1 and 2 of Fig.2) COUPLE A 2cc CAVITY WITH NO CONNECTION TO TEST POINT 2. THE OUTPUT AT TEST POINT TP-2 SHALL BE 2.50 VDC +/- .05 VDC, IF NOT ADJUST R33.
  • Page 18 Section 2.4 Service MT 1 CALIBRATION PROCEDURE Step 4 CONTINUED..ORIGINAL PCB DISTORTION TEST: SET UP:AS PER SOUND LEVEL TEST, EXCEPT FOR THE CENTER FREQUENCY OF THE FILTER. THE MEASURED LEVELS SHALL NOT EXCEED THOSE SHOWN BELOW: FILTER CENTER FREQ. (Hz) MAXIMUM SOUND LEVEL (dB) 500 ............
  • Page 19 Section 2.4 Service MT 1 CALIBRATION PROCEDURE Step 6 PERFORM PRESSURE CALIBRATION TEST:(taken from A-00849, pg.1,item 6, F&G) CONNECT UNIT TO MANOMETER OR EXTERNAL PRESSURE SOURCE AT ‘0’ daPa. AT 0 daPA, IF READING IS AT OR BETWEEN 89 - 8B (HEX), DO STEP B. IF THE READING IS NOT AT OR BETWEEN 89 - 8B HEX AT 0 daPa, THEN ADJUST R26 TO OR WITHIN THESE VALUES.
  • Page 20 Section 2.4 Service MT 1 CALIBRATION PROCEDURE Step 9 PUMP PRESSURIZATION TEST: WITH THE TIP COUPLED TO A 1cc CAVITY, AND THE START/RUN BUTTON ACTIVATED, THE PRESSURIZATION PERIOD SHALL BE .5 - 1 SECOND. See Fig.”Step8" page 16. Step 10 PUMP SPEED AND LINEARITY TEST: (EVEN THOUGH STEP 8 AND 9 REQUIREMENTS MAY BE DO NOT SKIP THIS STEP 10.
  • Page 21 Step 19 CHARGE CURRENT TEST: REFERENCE A-01777 TEST SPEC. FOR LEVEL 3, STEP 6. SETUP AMMETER IN LINE BETWEEN A 14 VDC POWER SOURCE AND THE MICRO TYMP 1 (WITH BATTERY). ACCEPTABLE READING IS 5.7 TO 7 MILLIAMPS. END CALIBRATION...
  • Page 22 Section 2.4 Service MT 1 CALIBRATION PROCEDURE CALIBRATION NOTES: date____/____/____ pg 19...
  • Page 23 MicroTymp 1 High Altitude Modification: When Required: The standard Micro Tymp 1 can be modified at the customers expense, to operate within specifications at high altitudes. This is the only Welch Allyn authorized modification and is recommended when MicroTymp 1 is to be used at higher altitudes. See Drawing 236250 on next page 20.1.
  • Page 24 Section 2.5 Service M I C R O T Y M P 1 H I G H A L T I T U D E M O D I F I C A T I O N Your Microtymp has been specially modified for use at high altitudes. Therefore, the following information should be added to page 3: Increase in +200 Vcc Actual Vol.
  • Page 25 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G INSTRUMENT: MICROTYMP 1 HANDLE MODEL #: 23600 PROBLEM: CAUSE: CORRECTIVE ACTION: 1. NOISY DISPLAY *DEF.

  • Page 26: High Altitude Modification

    Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G MODEL #: 23600 PROBLEM: CAUSE: CORRECTIVE ACTION: 6. MECHANICAL *VALVE LEAKS ....*CHECK / REPLACE VALVE LEAKS PRESENT.

  • Page 27: Troubleshooting

    Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G INSTRUMENT: PRINTER FOR MICROTYMP 1 MODEL #: 71130 PROBLEM: CAUSE: ......CORRECTIVE ACTION: 1.
  • Page 28 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Summary of failures and possible sources: 1. Microtymp displays Leak Symbol only... a hose could be pinched pump pad is not placed properly the motor case is open...
  • Page 29 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Summary of failures and possible sources continued... 7. Fails noise... U6 and or U7 defective U4 defective speaker and or microphone defective 8.
  • Page 30 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G 17.Pump does not return to home position... defective Q1 or Q2 open trace in flex cable defective optical interrupt diaphragm/piston has disconnected from top of drive helix 18.Low battery symbol...
  • Page 31 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Explanation of MicroTymp Symbols as they relate to troubleshooting: LEAK SYMBOL The Leak Symbol is displayed when the Tymp cannot build pressure to +200 daPa in order to start a reading (tymp).
  • Page 32 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Buttons Stick Possible Causes: 1. Button soldered to circuit board crooked 2.
  • Page 33 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Missing lines in printout (See sample at right) Possible causes: 1. Flash on paper feed slot. 2.
  • Page 34 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G 5. Disassemble stand to step #4 (Removing boards from housing, page 6) 6.
  • Page 35 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G To reassemble the printer, put the new head on and slide the shafts back in place. Push the gasket ring on the end of the grooved shaft.
  • Page 36 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G 7. Check the platen bar that the printer head rides on for any nicks. If it is ok, go on to the next step. If it is damaged, replace it with a new one.
  • Page 37 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G 8. Check the 9 pin connector that the flex plugs into, to be sure all pins are properly soldered to the circuit board.
  • Page 38 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Charge LED doesn't light when handle is in well. Possible cause: 1. Cold solder joint on charge contact. Repair: 1.
  • Page 39 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Printer/charger doesn't print or feed but green LED is on. Possible cause: 1. Microprocessor locked up. Repair: 1.
  • Page 40 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Prints no handle with microtymp in printer/charger. Possible causes: 1. Possible handle problem. 2.
  • Page 41 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G 5. With a soldering iron and solder reflow the solder that connects the blue and yellow wires to the data contacts.
  • Page 42 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Dead printer/charger (LED is not lit) Possible causes: 1. Blown fuse 2.
  • Page 43 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Printer /charger continues to print or feed Possible causes: 1. Microprocessor locked up. 2.
  • Page 44 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Printer /charger has power, (green LED lit) but won't print. Possible causes: 1. Paper roll loose. 2.
  • Page 45 Section 3.1 Service M I C R O T Y M P 1 T R O U B L E S H O O T I N G Problem: Printer /charger doesn't print but feeds. Possible causes: 1. Misfed paper. 2.
  • Page 46 NORMAL MAINTENANCE : BATTERY COVER, BATTERY, RECHARGING BATTERY 1. REFER TO PAGE 22 THROUGH PAGE 25 OF MICRO TYMP 1 OPERATING INSTRUCTIONS* FOR REPLACEMENT OF BATTERY PN72700. WARNING: INSERT BATTERY ONLY AS SHOWN ON PAGE 25 OF THE OWNERS MANUAL. FAILURE TO OBSERVE CORRECT POLARITY COULD CAUSE DAMAGE TO THE MICRO TYMP 1.
  • Page 48 REMOVE THE SCREW THAT HOLDS THE BATTERY COVER ON. REMOVE THE COVER. 2. REMOVE PATIENT SIDE HOUSING HALF. REMOVE THE WELCH ALLYN LOGO LABEL LOCATED ON THE PATIENT SIDE BY SLIDING A PAIR OF TWEEZERS UNDER THE LABEL AND LIFT OFF OLD LABEL. UNSCREW TWO PHILLIPS HEAD SCREWS WITH A P12S XCELITE SCREWDRIVER OR EQUIVALENT.
  • Page 49 Section 4.1 Disassembly & Reassembly Disassembly and Repair of the Handle CAREFULLY INSERT SCREWDRIVER TIP BETWEEN TAB AND INSIDE OF THE CASE FIGURE 4.2 SEE FIG. 4.3 BELOW. LAY THE HANDLE ON THE MAT WITH THE PRACTI- TIONER SIDE DOWN. PRESS WITH THE THUMB OF YOUR LEFT HAND AGAINST THE TOP OF THE INSTRUMENT (PRACTITIONER’S SIDE) WHILE GENTLY FORCING THE PATIENT SIDE COVER TOWARDS YOUR LEFT HAND.
  • Page 50 Section 4.1 Disassembly & Reassembly Disassembly and Repair of the Handle CONTINUED..BE VERY CAREFUL WHEN PULLING THE HOUSINGS APART SINCE THEY ARE JOINED TOGETHER BY BOTH THE HOSES AND THE FLEX CIRCUIT. WHEN THE HOUSINGS HAVE BEEN SEPARATED, SUPPORT THE FRONT HOUSING TO PRO- TECT THE FLEX CIRCUIT FROM STRESS AND POSSIBLE TEAR DAMAGE.
  • Page 53 Section 4.2 Disassembly & Reassembly Reassembly and Repair of the Handle 1. REMOVE LCD ASSEMBLY. REMOVE THE 2 SCREWS HOLDING DOWN THE HOUSING SUPPORTS. PULL THE LCD ASSEMBLY OUT OF THE BACK HOUSING. DISASSEMBLE THE LCD ASSEMBLY BY PUSHING IN ON THE TABS OF THE LCD FRAME AND PULLING OFF THE GRAY RETAINER.
  • Page 55 Section 4.2 Disassembly & Reassembly Re-assembly and Repair of the Handle 1. INSTALL NEW MOTOR. REFER TO FIGURE 4.7 NEXT PAGE. UNSOLDER THE RED AND BLACK MOTOR LEADS AT THE BOARD SIDE. REMOVE AND DISCARD THE OLD DRIVE BELT. REMOVE TWO MOTOR HOLDING SCREWS AND REMOVE THE OLD MOTOR.
  • Page 57 Section 4.2 Disassembly & Reassembly Re-assembly and Repair of the Handle 2. ADJUST SWEEP RATE FOR NEW MOTOR, CONTINUED..THE TIME SHOULD FALL BETWEEN 2.5 AND 2.6 SECONDS. IF IT IS LESS THAN 2.5 SECONDS, , ADJUST POT R39 COUNTER-CLOCK- WISE.
  • Page 58 THREADS. THEREFORE A SIMPLE FIX, DESCRIBED BELOW, IS RECOMMENDED. TO OBTAIN A FOAM PAD, CONTACT THE TECHNICAL SERVICE DEPARTMENT AT WELCH ALLYN. PHONE NUMBERS ARE LISTED ON PAGES 1.1 AND 1.2. 2. INSTALL FOAM PAD. REFER TO FIGURE 4.9 BELOW.
  • Page 59 Section 4.2 Disassembly & Reassembly Re-assembly and Repair of the Handle 1. ASSEMBLE BATTERY COMPARTMENT. SOLDER THE WIRES ONTO THE VALVE BOARD ( RED TO R, AND BLACK TO L). PUT THE BATTERY CONTACTS IN PLACE AND GLUE THEM WITH BLACK MAX ADHESIVE.
  • Page 60 WIPE THE MOUNTING AREA FOR THE LABEL WITH A SWAB DAMPENED WITH ISOPROPYL ALCOHOL. WAIT APPROXIMATELY ONE MINUTE FOR THE ALCOHOL TO EVAPORATE. ATTACH A NEW WELCH ALLYN LABEL. 1. SECURE HOUSINGS TOGETHER WITH LOCTITE BLACK MAX. CAUTION WHEN USING ADHESIVES: ALWAYS WEAR SAFETY GLASSES AND PROVIDE ADEQUATE VENTILA- TION WHEN USING ADHESIVES OR ACCELERATORS.
  • Page 61 Section 4.2 Disassembly & Reassembly Re-assembly and Repair of the Handle 1. INSERT BATTERY. MATCH THE BATTERY POSITIVE TO THE + LABEL IN THE BATTERY COM- PARTMENT. PUT COVER ON AND SECURE WITH SCREW. CHECK THE MICROTYMP BY OBTAINING A TYMPANOGRAM OF THE QUICK CHECK CAVITIES LOCATED IN THE PRINTER CHARGER STAND.
  • Page 62 Section 5.1 Disassembly & Reassembly Disassembly and Repair, Printer Charger CAUTION: PRIOR TO DOING REPAIR WORK, UNPLUG POWER CORD, USE GROUNDING MAT AND GROUNDING STRAP TO MINIMIZE SHOCK HAZARD AND REDUCE CHANCES OF DAMAGE TO SENSITIVE ELECTRONIC COMPONENTS. (6 CMOS IN HANDLE AND 1 CMOS IN PRINTER CHARGER) FIG.
  • Page 63 Section 5.1 Disassembly & Reassembly Re-assembly and Repair, Printer Charger FIG. 5-2 REMOVING 3 TOP HOUSING HOLDING SCREWS 3. REMOVE CIRCUIT BOARDS FROM THE HOUSING. CUT WIRE TIE AROUND TRANSFORMER. LOOSEN TERMINAL BLOCK SCREWS THAT HOLD THE BLACK,WHITE OR BLUE,BROWN WIRES. REMOVE GREEN WIRE: US AND CANADA MODEL...UNSCREW SCREW HOLDING THE WIRE ONTO THE TRANSFORMER.

  • Page 64: Printer Charger Re-Assembly

    Section 5.2 Disassembly & Reassembly Re-assembly and Repair, Printer Charger 1. REPLACE CIRCUIT BOARDS INTO HOUSING. CONNECT THE 20 PIN MALE CONNECTOR ON THE PRINTER BOARD INTO THE 20 PIN FEMALE CONNECTOR ON THE POWER SUPPLY BOARD. ATTACH THE TWO BOARDS TOGETHER USING TWO SCREWS, SPACERS. POSITION SPACERS BETWEEN THE MALE CONNECTOR AND THE POWER SUPPLY BOARD.
  • Page 65 Section 6.1 Calibrator Testing Procedure for testing MT1 Calibrator Box ELECTRICAL CONNECTIONS Check that all pins make good electrical contact. Place MicroTymp 1 in holding fixture T-5609. Set Box power switch to “OFF”. Connect BLACK 7.2 volt power supply lead to + battery contact. fig 6-1 Connect RED 3.6 volt power supply lead to long contact (back end of MT 1.) Connect GREEN Ground lead to side contact on T-5609.

  • Page 66: Section 6: Drawings

    A-01785 A-01862 High altitude modifications Micro Tymp Tympanometric System 23600 handle, 71130 printer charger Copyright 1995 Welch Allyn Co. Welch Allyn 4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220 Service manual pn236261 Rev.D 6/95 originator: RJS text cadfile 236253D.WP5...

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