Welch Allyn MicroTymp 3 Handle Manual de usuario
MicroTymp®3 Handle and
MicroTymp®Printer/Charger
Service manual
Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
© 2012 Welch Allyn. All rights are reserved. No one is permitted to reproduce or duplicate, in any form, this manual or any part
thereof without written permission from Welch Allyn.
Welch Allyn assumes no responsibility for any injury to anyone, or for any illegal or improper use of the product, that may result from
failure to use this product in accordance with the instructions, precautions, warnings, or statement of intended use published in this
manual.
Welch Allyn and MicroTymp are registered trademarks of Welch Allyn.
XP is trademark of Microsoft.
Software in this product is copyrighted by Welch Allyn or its vendors. All rights are reserved. The software is protected by United
States of America copyright laws and international treaty provisions applicable worldwide. Under such laws, the licensee is entitled
to use the copy of the software incorporated with this instrument as intended in the operation of the product in which it is
embedded. The software may not be copied, decompiled, reverse-engineered, disassembled or otherwise reduced to
human-perceivable form. This is not a sale of the software or any copy of the software; all right, title and ownership of the software
remain with Welch Allyn or its vendors.
For information about any Welch Allyn product, call the nearest Welch Allyn representative:
406695
Material No. 718441 Ver. A
www.welchallyn.com
USA + 1 315 685 4560
800 535 6663
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Welch Allyn, Inc.
4341 State Street Road
Skaneateles Falls, NY 13153 -0220 USA
Regulatory Affairs Representative
Welch Allyn, Limited
Navan Business Park
Dublin Road
Navan, County Meath, Republic of Ireland
REF
iii
Contents
1 - Introduction and technical overview .........................1
About this document ..............................................1
Intended use.....................................................1
About the device..................................................1
Supporting documents and definitions .................................2
Definitions.......................................................2
Technical overview ................................................3
Controls, indicators, and connectors ..................................5
Handle components ............................................5
Printer/Charger components .....................................6
Symbols ........................................................7
General warnings .................................................9
General cautions ..................................................9
General notes ...................................................10
2 - Testing and verification ..................................11
Tools ..........................................................11
Bench test and calibration check - Handle .............................13
Purpose of test...............................................13
Preparation for test ...........................................13
Bench test procedures.........................................14
Final Tester Setup ............................................17
Testing Performed by the ATE ......................................22
Bench test for the Printer/Charger ...................................23
Proper powering up of unit .....................................23
Proper operation of print head ...................................24
Agency tests....................................................26
Dielectric strength test.........................................26
Grounding continuity test.......................................27
Leakage current test ..........................................27
3 - Troubleshooting guide ...................................29
Handle.........................................................29
Printer/Charger ..................................................30
Noise troubleshooting procedure ....................................31
Leak troubleshooting procedure .....................................32
Error and service code tables with troubleshooting procedure .............33
Error codes..................................................33
Retrieving and clearing error codes ...............................33
Service codes................................................35
4 - Disassembly and reassembly..............................37
Handle.........................................................37
Disassembly Procedures .......................................37
iv Contents Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
Removal/replacement of the LCD and keypad board assemblies ........42
Removal/replacement of the power PCBA .........................43
Removal/replacement of the MCU PCBA ..........................44
Replacement of Lithium coin battery ..............................45
Proper placement of ESD shields in the back housing.................45
Printer/Charger ..................................................46
Removal/replacement of the top panel ............................46
Removal/replacement of the main PC board and print head assemblies. . . 47
Removal/replacement of the contact housing and IR flex assemblies.....48
Removal/replacement of the printer keyboard/LEDs assembly ..........49
Removal/replacement of the RFI filter .............................49
Removal/replacement of old main PC board and print head ............50
A - Repair parts ............................................51
B - Cleaning...............................................55
Clean the handle .................................................55
Clean the printer/charger ..........................................55
Clean the probe tips ..............................................55
C - Replacement parts and accessories ........................57
1
1
Introduction and technical overview
About this document
This document is written for technical professionals who are qualified to service medical
instruments. The intended technical environment is any location where service on such
devices is performed. This document describes how to test, calibrate, diagnose,
disassemble, and assemble the MicroTymp3 Handle and MicroTymp Printer/Charger.
Before attempting service on the tympanometer, you must read and understand this
document and all other information that accompanies the tympanometer and its
accessories.
Intended use
This device is an auditory impedance tester intended to detect possible otologic disorders
associated with the functioning of the middle ear.
About the device
Federal US law restricts sale of the device identified in this manual to, or on the order of, a
licensed physician.
Using this device’s 226-Hz and 1000-Hz tympanometry settings, you can quickly and
easily obtain objective results supporting diagnosis of otitis media with effusion and other
middle ear disorders. This information can result in more thorough diagnoses as well as
more effective monitoring, treatment, consultation, and referral.
The 226-Hz test data stored in the memory of the Handle may be printed using the
Printer/Charger. The Printer/Charger reads the information from the Handle and prints out
tympanograms and interpretation.
The switch to change the default frequency is located on the top of the power supply PC
board. The table on the next page gives the function choices of this switch pack.
Note The Handle also provides the ability to test patients utilizing a 1000-Hz frequency
mode. This mode features a quick interpretation result that displays a Pass, Refer,
or Retest message on the LCD (see Chapter 4 of the DFU, part number 714694).
Results from the quick interpretation mode can be documented using the 1000-
Hz screening results card. Results from the 1000-Hz quick interpretation mode
will not print.
2Introduction and technical overview Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
The Printer/Charger also charges the rechargeable battery in the Handle.
For more detailed operating instructions, see the DFU for the MicroTymp3 Handle, part
number 714694.
Supporting documents and definitions
• Manufacturing Test Specifications for MicroTymp 2.5, DIR number 60029314
• DID for MicroTymp 2.5, DIR number 60029426
• MicroTymp3 Directions for Use, DIR number 80015401
• MicroTymp Hardware Technical Specifications, DIR number 60030837
• How2 - MicroTymp 2.5 MPS, DIR number 70020334
Definitions
Switch State Function
Switch 1 off 1000 Hz
Switch 1 on 226 Hz
Switch 2 off Platform communication
Switch 2 on Printer communication
Switches 3 and 4 Not used
ATE Automated Test Equipment
cc Cubic centimeter, a unit of volume
daPa Decapascal, the unit of air pressure used for tympanometric
measurements, 1 daPa = 1.04 mm H20
EEPROM Electrically Erasable Programmable Read-Only Memory
LUT Look Up Table
mbar Unit of atmospheric air pressure measurement
mmho Acoustic millimho, the unit of acoustic admittance
MCU PCA Micro controller Unit Printed Circuit Board Assembly
PS PCA Power Supply Printed Circuit Board Assembly
USB Universal Serial Bus
UUT Unit Under Test
Vea Volume of ear canal
WACP Welch Allyn Communications Protocol
Service manual Introduction and technical overview 3
Technical overview
The Handle hardware contains the necessary circuitry to perform, measure, and report
tympanograms. It is designed to be portable and rechargeable, and to interface with its
corresponding printer device.
In order to perform a tympanogram, the hardware must support a motor/pump assembly
that is capable of a positive and negative pressure in the ear canal. Simultaneously, a
speaker must drive a monotonic 226-Hz, 85 dB sound pressure into the ear. A
microphone amplifier and A/D converter are included to monitor this sound pressure. The
control of the system (tone and pressure), and display of the tympanogram are
implemented with two micro controllers. The hardware and software must provide a
closed-loop system that maintains the 85 dB sound pressure, regardless of the acoustical
admittance in the ear that changes with pressure.
In addition, the Handle shall be capable of performing fully the above function with a
1000-Hz, 83 dB tone.
In order to support the operator interface, the hardware supports an LCD and keypad with
three keys. In order to interface with the Printer/Charger, the Handle has an IR sensor
communication interface. The Handle is designed to start by the press of a button, or by
insertion into the printer/charger unit.
The Handle hardware system is broken down at the top level into three board-level
assemblies:
1) The MCU Board
2) The Power Supply Board
3) The LCD Board
There are other integral components such as the sensors, motor/pump assembly,
switches, USB port, and IR interface which play significant roles in the plotting of the
tympanogram, the powering up of the unit, and the communication of the unit with a
service computer, ATE testing station, or Printer/Charger.
The Power Supply Board can be broken down into these subsystems:
1. The keypad/power up logic is responsible to start the power supply and interrupt the
master MCU whenever a key is depressed. It also reports which key is depressed and
receives an input from the MCU to keep the system powered up.
2. The battery charger provides a constant current charge to the battery whenever the
Handle is in a printer base. When the battery voltage reaches 4.2 volts, the charger
shall cease charging the battery.
3. The battery detection reports a low battery warning to the micro controller.
4. The negative power supply is an inverting switched capacitor power supply used to
support the analog circuitry and the LCD display.
5. The pump motor control provides a selectable voltage to the motor in either forward
or reverse polarity.
6. The pump motor home detect determines whether the pump diaphragm is above or
below the home position.
7. The valve control provides a fixed voltage to the valve in either the open or closed
polarity.
4Introduction and technical overview Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
The MCU Board can be broken down into these subsystems:
1. The master micro controller is directly responsible for the sound pressure control
loop, operator interface, IR communication, USB communication, and power control.
2. The slave micro controller is directly responsible for the motor control, valve control,
and pressure amplifier.
3. The IR communication is a bidirectional link between the Handle and Printer/Charger
base.
4. The USB port is a bidirectional link between the Handle and either the ATE or the
service computer.
5. The speaker drive provides a 226-Hz sine wave to the speaker. The amplitude is
adjusted by the master MCU to control the sound compliance loop. Digital calibration
is also provided for speaker gain and system cavity size differences. These same
processes also apply to the 1000-Hz function of the Handle.
6. The microphone sends its signal to the A/D converter before filtering. This is true for
both the 226-Hz and 1000-Hz signals.
7. The ADC digitizes the output of the microphone amplifier to be used by the master
MCU in the compliance control loop. Digital calibration of the microphone gain is also
performed.
8. The pressure amplifier scales the signal from the pressure transducer and provides it
to the slave MCU. Digital calibration for transducer gain and offset are provided.
Service manual Introduction and technical overview 5
Controls, indicators, and connectors
Handle components
TEST
-400 -200 0 200
2
0.5
0
1.0
1
GR
A
GR
C
PRESSURE - daPa
Ya - mmho
+200 Vea - cc
MicroTymp®
3
Portable Tympanometric Instrument
0297
IEC TYPE 3
Skaneateles Falls, NY USA
US Pat #5,383,097
ANSI TYPE 4
Patent Pending
CUS
74227
23650
REF
ON CTS
ON
OFF
1234
ON CTS
ON
OFF
1234
72910
REF
+
-
Lithium
Ion
Liquid Crystal
Display (LCD)
Left memory button
Test button
Right memory button
Infrared data
transfer window
Tip
Probe
Tip
ejector
Battery
cover
Micro-USB port
NOTE: Reserved for future use
Lithium-ion
battery
Side view Front view
Bottom view Interior view
Handle
switches
6Introduction and technical overview Welch Allyn MicroTymp3 Handle and MicroTymp Printer/Charger
Printer/Charger components
Power Cord
Tip box POWER
indicator
CHARGE
indicator
FEED button
PRINT button
Paper
slot
Paper access
cover
Charging well for
MicroTymp 2 or 3
Card holder
with 1000-Hz
screening
results cards
IEC power cord
receptacle
Printer/Charger
switches
To IEC power
cord receptacle
To power
receptacle
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