Welch Allyn Micro Tymp 2 Service Manual
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Welch Allyn Micro Tymp 2 Service Manual

Tympanometric system
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Service Manual
Micro Tymp 2
Tympanometric System
23640 handle, 71170 printer charger
(Includes CE Model)
4341 State Street Road
P .O. Box 220
Skaneateles Falls, NY 13153-0220
Copyright 1995
Part #: 236409

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  • Page 1 Service Manual Micro Tymp 2 Tympanometric System 23640 handle, 71170 printer charger (Includes CE Model) 4341 State Street Road P .O. Box 220 Skaneateles Falls, NY 13153-0220 Copyright 1995 Part #: 236409...
  • Page 2 Part Desc. of Change ECN # Date Initiator 236409 New Release 5-28225 6/95 R. Settembre 236409 Added CE Updates & Cautions 5-35489 6/97 R. Settembre NOTE: Drawings & illustrations in this document are for reference only. Consult system or call factory for latest revisions. MICROTYMP 2...
  • Page 3 SERVICE MANUAL Micro Tymp 2 Tympanometric System 23640 handle, 71170 printer charger (Includes CE Model) Copyright 1995 Welch Allyn Co. Welch Allyn 4341 State Street Road P.O. Box 220 Skaneateles Falls, NY 13153-0220 Service Manual Part #:236409...
  • Page 4 I M P O R T A N T : Welch Allyn service part numbers and material numbers appearing in this manual are for the purpose of familiarizing new technicians with the Welch Allyn parts numbering system.

  • Page 5: Safe Service

    Give them all accompanying paperwork and any information you might have on the return. They will take appropriate action according to Welch Allyn policy. Check customer service records to determine if this MicroTymp 2 requires or has received any applicable retrofit modifications, improvements, or inspections, and perform these if required.

  • Page 6: Table Of Contents

    Tools/Test Equipment listing Calvin Components Section 9 Repair Parts Section 10 Drawings Section 11 A-02727 Process Sheet excerpts for 23641 Micro Tymp 2 Handle tests Section 12 A-02728 Process Sheet excerpts for 71171, 71172, 71174, 71176, 71179 Micro Tymp 2 Printer Charger Tests...

  • Page 7: A Normal Maintenance

    WARNING: INSERT BATTERY ONLY AS SHOWN IN THE OWNERS MANUAL. FAILURE TO OBSERVE CORRECT POLARITY COULD CAUSE DAMAGE TO THE MICRO TYMP 2. WHEN IT IS NECESSARY TO RE- PLACE THE BATTERY, USE ONLY A WELCH ALLYN PN72900 REPLACE- MENT BATTERY. OTHER NON APPROVED BATTERIES MAY CAUSE RISK OF FIRE OR PRODUCT FAILURE.

  • Page 8: B Power Supply Board Assembly

    NOTE: WEAR ESD WRIST STRAP WHILE PERFORMING THE FOLLOWING OPERATIONS. POWER SUPPLY BOARD ( TOP BOARD ) ASSEMBLY REMOVE BATTERY COVER. FOLLOW INSTRUCTIONS IN MICROTYMP 2 OPERATING INSTRUCTIONS TO REMOVE BATTERY COVER AND BATTERY. IT IS NOT NECESSARY TO REMOVE THE FRONT HOUSING ASSEMBLY FOR POWER SUPPLY BOARD REPLACEMENT.

  • Page 9: Cmotor/Pump Assembly

    REMOVE THE BATTERY FROM THE BATTERY HOLDER. REMOVE FRONT HOUSING ASSEMBLY. PEEL THE WELCH ALLYN LABEL FROM THE UNIT AND UNSCREW TWO SCREWS UNDER THE LABEL. REMOVE THE FRONT HOUSING ASSEMBLY FROM THE HANDLE. DO NOT UNPLUG FLEX CIRCUIT FROM LCD BOARD.

  • Page 10: Ekeypad Assembly

    MCU ( BOTTOM ) BOARD REPLACE MCU BOARD. INSTALL FOUR PLASTIC SPACERS ON THE BOTTOM OF THE BOARD. INSERT REPLACEMENT BOARD INTO HANDLE WITH INFRA-RED LED AT BASE OF HANDLE FACING IR WINDOW. SCREW FOUR STANDOFFS INTO CORNERS OF MCU BOARD. TIGHTEN TO 1.5 TO 2 INCH LBS. PLUG IN FLEX CIRCUIT.

  • Page 11: Flcd Assembly

    KEYPAD ASSEMBLY REPLACE MOTOR/PUMP ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION C4 THROUGH C6 FOR MOTOR/ PUMP ASSEMBLY. TEST HANDLE. PERFORM FUNCTIONAL CHECKS TO ASSURE CORRECT OPERATION OF REPLACEMENT SWITCHES. NOTES:________________________________________________________________________ ______________________________________________________________________________ LCD ASSEMBLY REMOVE LCD RETAINER. FOLLOW STEPS E1 THROUGH E3 TO REMOVE LCD RETAINER. REMOVE LCD MODULE.

  • Page 12: Gesd Shields

    ESD SHIELDS (CE MODEL) REMOVAL OF ESD SHIELDS (SEE FIG. G-1) REMOVE POWER SUPPLY BOARD. FOLLOW INSTRUCTIONS IN SECTION B. REMOVE MOTOR PUMP ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION C. REMOVE MCU BOARD. FOLLOW INSTRUCTIONS IN SECTION D. REMOVE KEYPAD ASSEMBLY. FOLLOW INSTRUCTIONS IN SECTION E.

  • Page 13: Hvalve

    VALVE REMOVE VALVE FROM POWER SUPPLY BOARD. REMOVE BATTERY COVER AND BATTERY FROM HANDLE. REMOVE POWER SUPPLY BOARD FROM HANDLE BY FOLLOWING STEPS IN SECTION B 1 THROUGH B 4. UN-SOLDER VALVE FROM FOUR CON- NECTION POINTS UNDER THE POWER SUPPLY BOARD. LIFT VALVE FROM BOARD AND DISCONNECT TUBING FROM VALVE.

  • Page 14: Kprinter And/Or Pcb

    KEYPAD REMOVE KEYPAD. UNPLUG MICROTYMP 2 PRINTER/CHARGER FROM LINE VOLTAGE. PEEL OLD KEYPAD FROM PRINTER/CHARGER TOP PANEL USING FINGERNAIL UNDER ONE CORNER. UNPLUG FLEX CIRCUIT. GENTLY PULL FLEX CIRCUIT FROM BACK OF KEYPAD. REMOVE ANY RESIDUAL ADHESIVE FROM THE PRINTER/CHARGER TOP PANEL WITH ALCOHOL.
  • Page 15 PRINTER AND/OR PCB REPLACEMENT. FIGURE I - 1 UNFASTENING TOP PANEL * Unfasten the top panel by removing all screws as shown in the figure above, except the two screws marked with arrows. These two screws hold the PCB to the lower housing.
  • Page 16 PRINTER AND/OR PCB REMOVE PRINTER AND PCB FROM PRINTER/CHARGER HOUSING. TURN THE HOUSING ON END AND SUPPORT THE PCB FROM WITHIN WHILE UNSCREWING TWO REMAINING SCREWS AND NUTS. LIFT THE PRINTER/PCB ASSEMBLY PARTIALLY OUT OF THE CASE TO ALLOW YOU TO DISCONNECT THE THREE POWER LEADS FROM THE EMI FILTER.
  • Page 17 • When Performed: Before recalibration. • Required Equipment: Welch Allyn Calvin Recalibration system, Digital Volt Ohm meter, Pressure Box T-5657 or equivalent pressure source (400 dPa max, with 1 dPa resolution on digital display), fully charged battery. Test 1 Leaks 1.1 —...
  • Page 18 Preliminary Bench Test for MicroTymp 2 23641 continued: Test 2 Vent Rate 2.1 — Momentarily apply 7.2 VDC across valve coil (with reverse polarity) to open (unlatch) valve. See FIG 2.1 for polarity. This will vent -400 dPa from step 1.8. 2.2 —...
  • Page 19 Preliminary Bench Test for MicroTymp 2 23641 continued: Test 4 Recharge 4.1 — Establish and maintain 7.2 VDC to handle charge contacts. Polarity is shown in FIG 4.1 4.2 — Snap the negative end of a fully charged battery into negative battery clips with the battery positive end tipped up at about 45 degrees.
  • Page 20 Preliminary Bench Test for MicroTymp 2 23641 continued: Test 5 Inactive Current Drain 5.1 — Keep battery in partially installed position as in step 4.2 above. 5.2 — Connect Milliammeter ( - ) Negative lead to positive spring contact in the battery compartment as per FIG 5.2 5.3 —...
  • Page 21 Preliminary Bench Test for MicroTymp 2 23641 continued: 7 Calvin Calibration for “Needs Cal” 7.1 — Select Main Menu option #2 “Calibration Tools”. ENTER 7.2 — Select Tools Menu option #1 “I2E2 Prom Editor”. ENTER 7.3 — Wait 5 seconds for CALVIN to display PROM REGISTER Observe data in registers 2E and 2F.
  • Page 22 SECTION 3 Micro Tymp 2 Noise Test Procedure The purpose to these instructions are to give a general procedure in fixing a noisy Micro Tymp 2 handle. Verify the unit by testing the unit manually with a 0.2cc, 1.0cc and 2.4cc cavity.
  • Page 23 SECTION 4 Troubleshooting Guide for MicroTymp2 Handles: Problem: Solutions: No Tone • Check solder connections from the speaker to the flex • Make sure speaker is seated in boot and on the SS tube • Check to see if the Speaker’s SS tube in the probe tip is clogged •...
  • Page 24 SECTION 4 MICRO TYMP 2 TROUBLESHOOTING MODEL # 23641 PROBLEM CAUSE CORRECTIVE ACTION Reads ‘NEEDS CAL’ Error(s) in register(s) Reset error register(s) Does not power up Battery low voltage Recharge / replace battery Flexcable at keypad board loose Reinsert flex cable at...
  • Page 25 SECTION 4 MICRO TYMP 2 TROUBLESHOOTING MODEL # 23641 PROBLEM CAUSE CORRECTIVE ACTION Defective motor Replace motor Fails noise test Pulley set screw out of readjust pulley set screw adjustment Defective microphone Replace microphone Fails noise test (second pixel high or...
  • Page 26 SECTION 4 TROUBLESHOOTING GUIDE FOR 71171 MT2 PRINTER/CHARGER PROBLEM CAUSE CORRECTIVE ACTION Does not power up Shorted Q1 Replace Q1 Fuse blown Shorted D1 Replace D1 Defective C3 Replace C3 Defective C4 Replace C4 Defective U1- Voltage at U1, Replace U1 Does not power up pins ll - 12 is too low (under Fuse not blown...
  • Page 27 HANDLE HAS FAILED INTERNAL CALIBRATION TEST SEE PAGE 14, FIG. 18 OF OPERATING INSTRUC- TIONS). RETURN INSTRUMENT FOR SERVICE. (WELCH ALLYN RECOMMENDS ANNUAL RECALIBRATION OF THE HANDLE). THE PRINTER CHARGER BASE DOES NOT REQUIRE CALIBRATION. A MONTHLY FUNCTIONAL CHECK USING THE MI- CRO TEST CAVITY IS RECOMMENDED (SEE PAGE D- 51 OPERATING INSTRUCTIONS).
  • Page 28 CUSTOMER SERVICE QUESTIONS AND ANSWERS (ALSO REFER TO OPERATING INSTRUCTIONS PN 236311) FAILURE or COMPLAINT: POSSIBLE CAUSE & CORRECTIVE ACTION: UNIT WILL NOT CHARGE ONLY A MICROTYMP 2 PRINTER CHARGER WILL CHARGE THE MICROTYMP 2 HANDLE. CHECK THAT PRINTER CHARGER POWER CORD IS CONNECTED TO THE PRINTER CHARGER AND A FUNCTIONING RECEP- TACLE OF PROPER VOLTAGE, FRE-...
  • Page 29 Skaneateles Falls, NY 13153 All rights reserved. This document is the property of Welch Allyn, Inc. The contents are considered confi- dential and proprietary. This document can only be duplicated or distributed with the expressed written consent of the Welch Allyn Corporation.
  • Page 30 Table of Contents Introduction .......................31 Calibration Process ...................31 Background Information ................31 Error Handling ..................31 Calvin.res File ..................32 Log File ....................32 Potentiometer Setting Routine .................32 Operational Procedure..................33 Menu Options ...................... 9 Calibration Signature ..................37 Status Registers ....................40 Handle Command List ..................41...

  • Page 31: Introduction

    1 Introduction This document presents an overview of the calibration process and functionality testing performed on the MicroTymp2 handle by the calibration system. The primary purpose of the calibration system is to calibrate MicroTymp2 handles after they have been as- sembled.

  • Page 32: Calvin.res File

    It is possible that calibration equipment failures or misalignments will cause errors in the calibration. In most cases these errors will have the term ‘Equipment error’ in the error message. In some cases it will be difficult to differentiate between a handle failure and equipment failure;...

  • Page 33: Operational Procedure

    3 Operational Procedure Initialization and basic functionality checks of the calibration equipment are performed when the calibration system is first booted. These checks insure that the calibration equipment is working properly. In addition, part of the operational procedure should be a step to calibrate the equipment each day, or as often as is necessary.
  • Page 34 Handle Self Test This step insures that the handle microcontrollers are operating properly and all memory is functional, including ROM, RAM, and PROM. A “self test” command will be sent to the handle, which causes the RAM and ROM for both microcontrollers to be tested and the results returned.
  • Page 35 Pressure Convergence Test Pressure is set to 0 daPa. The offset pot is checked for a target value of 150, if the value is in spec., the pressure is set to +200daPa, and the gain pot is checked for a target value 21.
  • Page 36 Calibrate Speaker This calibration step calibrates the handle speaker. The operator will be prompted to place a standard 3.0cc cavity on the handle tip. The handle will be instructed to gener- ate an 85 dB signal by setting the admittance gain pot to the predetermined value for 3.0cc cavity.

  • Page 37: Menu Options

    LCD element out. Bad LCD, bad flex, address line open LCD stuck neighbors. Bad LCD, bad flex, address line short LCD pixels are faded. Bad LCD, bad flex Button Test This will test the operability of the three buttons on the handle. The operator will be prompted to press each of the three buttons in turn.
  • Page 38 • Align MicGain Pot Calibrates the microphone gain pot as part of the compliance sub- system alignment of the handle. • Compliance Subsystem Calibrates the compliance subsystem components (speaker and admittance gain pots) of the handle. • Motor Sweep Rate Calibrates the motor subsystem components of the handle. •...
  • Page 39 • Speaker Off Sends a ‘speaker off’ command to the handle. • Read Microphone Sends a ‘read microphone’ command to the handle and displays the result. Calvin Tools Menu • Set Pressure The system requests the user place the pressure tube on the handle and then requests a pressure value.

  • Page 40: Calibration Signature

    Calibration Signature At PROM address 2E (hex) and 2F (hex), a 16 bit word describes the state of the handle. When the 16 bit word states “FACE”, the unit considers itself to be calibrated. When the unit does not say “FACE”, and it should say “DEAD”, the unit considers itself under calibration.

  • Page 41: Handle Command List

    7 Handle Command List Ping Handle Establish communications C ^A Read I2E2PROM Will read one byte from I2E2PROM C ^B Write I2E2PROM Will write one byte to I2E2PROM C ^C Pressure Up Drives pressure up to +200 daPa C ^D Pressure Down Sweeps from +200 daPa to -400 daPa C ^E...
  • Page 42 SECTION 7 Troubleshooting Guide for MicroTymp2 Handles: 11 MicroTymp2 Noise Test Procedure 13 Introduction In trouble shooting NEEDS CAL messages on the MicroTymp 2 there are two registers in the EEPROM that are of interest - $AC (Historical Slave Error Register) and $AD (Historical Master Error Register).
  • Page 43 BINARY DEC BINARY BINARY 00100100 01111001 11001110 00100101 01111010 11001111 00100110 01111011 11010000 00100111 01111100 11010001 00101000 01111101 11010010 00101001 01111110 11010011 00101010 01111111 11010100 00101011 10000000 11010101 00101100 10000001 11010110 00101101 10000010 11010111 00101110 10000011 11011000 00101111 10000100 11011001 00110000 10000101 11011010...
  • Page 44 2. How to Determine the Error Each error register can be assigned any one of the 256 possible hex numbers listed above. Each number represents a specific combination of errors. By converting the HEX number in the error register to its binary equivalent and using the error code tables below, you will be able to determine what errors caused the unit to display the NEEDS CAL message.
  • Page 45 3. Historical Slave Error Register This register indicates any error that occurred in the Slave microcontroller during operation. The Slave is responsible for the pressure sub-system of the MicroTymp 2. This include the operation of the pump & motor, valve, and pressure transducer. It receives commands from the Master microcontroller to perform the task such as pressure up, pressure down, open/close valve, read pressure transducer, etc.
  • Page 46 this bus, they do use it to communicate with the EEPROM. All data stored in and retrievedfrom EEPROM passes through this bus. The voltage levels on the two bus lines indicate different things to the microcontrollers. In addition, if both the Master and the Slave try to use the bus at the same time, an error could occur.
  • Page 47 Historical Master Error Register N/A - $80 / 1XXXXXXX THIS ERROR SHOULD NOT OCCUR. IF IT DOES REPLACE THE MASTER OR MCU PCB. N/A - $40 / X1XXXXXX THIS ERROR SHOULD NOT OCCUR. IF IT DOES REPLACE THE MASTER OR MCU PCB. N/A - $20 / XX1XXXXX THIS ERROR SHOULD NOT OCCUR.
  • Page 48 Slave Error - $02 / XXXXXX1X 4.7.1 Description: This error occurs only when the Slave has an error of its own that has been written to the Historical Slave Error Register. 4.7.2 Suggestions: Verify that the Slave is working properly - Investigate the error indicated in the Historical Slave Error Register.
  • Page 49 NEEDS CAL With Both Error Registers = $00 There are three error cases in which NEEDS CAL is displayed on the LCD screen but no error is indicated in either the Historical Master Error Register or the Historical Slave Error Register. They are as follows: Unit Not Calibrated - $00 / 00000000 5.1.1 Description: This error occurs when the proper calibration signature $fa $ce is not written in...
  • Page 50 The Calvin Calibration System is custom built from the items on the Lotus Spreadsheet on the next page. Some of these are custom built Welch Allyn fixtures and fittings and are so designated by a ‘T’ number. Other items, such as the Diaphragm Tucker and the Board to Board connector are required.
  • Page 51 31 Electronics Base and miscellaneous hardware Holds electronics and components T-12168 32 Welch Allyn 8 piece Test Cavity Set for CALVIN SIZES: .2, .5, 1, 1.5, 2, 2.4, 2.5, 3 T-12494 33 Angle Bracket for B&K Sound Level Meter Holds sound level meter in housing...
  • Page 52 BILL OF MATERIALS-REPAIR MICRO TYMP 2 PRINTER CHARGER AND HANDLE Welch Allyn service part numbers and material numbers appearing in this manual are for the purpose of familiarizing new technicians with the Welch Allyn parts numbering system. Order replacement parts, as always, by referencing your latest bill of materials,...
  • Page 53 Repair Parts MT2 Handle WHERE USED PART NUMBER DESCRIPTION 23641 REPAIR M11120 5 1/4 X 12 1/2 POLY BAG 2MIL 23641 REPAIR M11385 DISPOSABLE DISPENS1NG TIP 23641 REPAIR M11478 PARTS LABEL 23641 REPAIR M30341 BLACK MAX 23641 REPAIR M30399 LOCTITE 712 ACCELERATOR 23641 REPAIR 106100-1 PHPS 2-56 X.250...
  • Page 54 MT 2 Printer Charger Repair Parts Where used Part Number Description 71171 REPAIR M11249 POLY BAG 11 x 14 x 1 1/2 71171 REPAIR M11478 PARTS LABEL 71171 REPAIR 106100-4 PHPS 4-40 x .38 LG 71171 REPAIR 106131-2 4-40 x .38 NYLON HEX 71171 REPAIR 236409 MICROTYMP 2 SERVICE MANUAL...
  • Page 55 MT2 DRAWINGS NOS: 236300 236302 236304 236305 236308 236330 236340 711700 MICRO TYMP 2 HARDWARE BLOCK DIAGRAM...
  • Page 65 SECTION 11 A 02727 -- PROCESS SHEET EXCERPTS FOR 23641 MICROTYMP 2 HANDLE TESTS...
  • Page 66 SECTION 12 A-02728 Process Sheet excerpts for 71171,71172,71174,71176,71179 Micro Tymp 2 Printer Charger tests...

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