Welch Allyn Micropaq 402 User manual

Micropaq
®
Monitor
Service Manual
Model 402 and Model 404
Software version 1.5X

ii Welch Allyn Micropaq Monitor
Copyright 2006, Welch Allyn. All rights are reserved. No one is permitted to reproduce or duplicate, in any
form, this manual or any part thereof without permission from Welch Allyn.
Welch Allyn assumes no responsibility for injury or for any illegal or improper use of the product that may
result from failure to use this product in accordance with the instructions, cautions, warnings, or
indications for use published in this manual.
Welch Allyn®, Acuity®, Micropaq®, FlexNet® and Flexible Monitoring®are registered trademarks of Welch
Allyn, Inc.
Nellcor® is a registered trademark of Nellcor Puritan Bennett. Masimo®and SET®are registered trademarks
of Masimo Corporation.
Software in this product is Copyright 2006, 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 within 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, please call Welch Allyn Technical Support:
Reorder Part Number 810-2313-XX (CD)
Reorder Part Number 810-2317-XX (printed)
Manual Part Number 810-2279-00 Rev A, 02/2006
Welch Allyn
8500 SW Creekside Place
Beaverton, Oregon 97008-7101
USA
www.monitoring.welchallyn.com
Printed in USA
USA 800 535 6663
315 685 4560
Australia 61 2 9638 3000
800 074 793
Canada 800 561 8797 China 86 21 6327 9631
European Call Center 353 46 9067790 France 33 1 55 69 58 49
Germany 49 7477 9271 86 Japan 81 3 3219 0071
Latin America 305 669 9003 Netherlands 31 157 505 000
Singapore 65 6419 8100 South Africa 27 11 777 7555
United Kingdom 44 1332 363812
0123

iii
Contents
1 - Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Warnings and Cautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrostatic Discharge (ESD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 - Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Purpose and Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Technical Support and Repair Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Returning Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Product Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Service Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Warranty Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Non-Warranty Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Connectors, Indicators and Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Service Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 - Functional Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Visual Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Power-Up Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ECG Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SpO2Test (Model 404 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Network Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wireless to Acuity Central Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Battery Charger Functional Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Replace Fuses in the Battery Charger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
System Information Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SpO2 Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Network Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Network Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Change the Network Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Changing a Factory-Defined Network Name . . . . . . . . . . . . . . . . . . . . . . . . 21
Changing a Custom Network Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

iv Contents Welch Allyn Micropaq Monitor
4 - Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Alert Messages and Display Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5 - Repair Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Zero Insertion Force (ZIF) Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Disassembly - Model 404 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Opening the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Removing the SpO2Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Disconnecting the SpO2Board (Masimo models) . . . . . . . . . . . . . . . . . . . . 32
Disconnecting the SpO2Board (Nellcor models) . . . . . . . . . . . . . . . . . . . . . 33
Removing the Main Board, Subframe and Radio Card (all models) . . . . . . . 34
Removing the Display from the Front Case . . . . . . . . . . . . . . . . . . . . . . . . . 35
Reassembly - Model 404 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Installing the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Installing the Main Board, Subframe and Radio Card. . . . . . . . . . . . . . . . . . 39
Installing the SpO2Board (Masimo models) . . . . . . . . . . . . . . . . . . . . . . . . 43
Installing the SpO2Board (Nellcor models) . . . . . . . . . . . . . . . . . . . . . . . . . 44
Installing the SpO2Shield (all models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Closing the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Attaching Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Disassembly - Model 402 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Opening the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Removing the Main Board, Subframe and Radio Card . . . . . . . . . . . . . . . . . 50
Removing the Display from the Front Case . . . . . . . . . . . . . . . . . . . . . . . . . 51
Reassembly - Model 402 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Installing the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Installing the Main Board, Subframe and Radio Card. . . . . . . . . . . . . . . . . . 55
Closing the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Attaching Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6 - Technical Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Feature Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Micropaq 402 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Micropaq 404 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Understanding Micropaq and the FlexNet Network . . . . . . . . . . . . . . . . . . . . . . 62
7 - Field Replaceable Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

1
1
Safety Summary
All users of the monitor must read this safety summary and all warning and caution
statements in the manual.
General Safety Considerations
• If the monitor detects a problem that prevents it from operating properly, it
displays an error message and error number. Report such errors to Welch Allyn.
• Do not service a monitor under warranty. Servicing a monitor under warranty
voids the warranty. All service on monitors under warranty must be performed by
Welch Allyn.Contact Welch Allyn for information about post-warranty period
service.
• Frequently check all cables, both electrically and visually.
Definitions
Warnings and Cautions
Familiarize yourself with all warnings and cautions before using the monitor.
WARNING The Warning symbol indicates a condition that could lead to illness,
injury or death.
Caution The Caution symbol indicates a condition that could damage
equipment or other property.
WARNING The monitor may not meet its performance specifications if stored or
used outside the specified temperature and humidity ranges.
WARNING Make frequent electrical and visual checks on cables, sensors, and
electrode wires. All cables, sensors, and electrode wires must be inspected and
properly maintained and in proper working order to allow the equipment to
function properly and protect patient safety.
WARNING If the monitor has been dropped or severely abused, remove it from
service until it has passed the functional verification.
Caution Do not autoclave the monitor. Autoclave accessories only if the
manufacturer's instructions clearly approve it. Many accessories can be severely
damaged by autoclaving.

2Safety Summary Welch Allyn Micropaq Monitor
Symbols
The following symbols appear on the monitor, battery charger or accessories.
Symbol Definition Symbol Definition
Direct current (battery charger) Enclosure Protection Drip proof: Classification
IPX1 per EN60529: 1991
Alternating current (battery charger) Fuse (battery charger)
The CE Mark and Notified Body Registration
Number signify the device has met all essential
requirements of European Medical Device
Directive 93/42/EEC
This device has been tested and certified by
the Canadian Standards Association
International to comply with applicable U.S.
and Canadian medical safety standards.
Signifies the device has met all essential
requirements of European Medical Device
Directive 93/42/EEC for a Class 1 product
(battery charger)
kj Patient connections are Type CF, isolated for
direct cardiac application, and protected
against defibrillation
Caution: Refer to Directions For Use and
accompanying documentation
For indoor use only (battery charger)
Non-ionizing electromagnetic radiation Alarm(s) Off
Connected to the Acuity network Not connected to the Acuity network
Low battery Do not dispose of this product as ‘unsorted
municipal waste’. Prepare it for reuse or
separate collection as specified by Directive
2002/96/EC of the European Parliament and
the Council of the European Union on Waste
Electronic and Electrical Equipment (WEEE).
(See www.welchallyn.com/weee.)
If the monitor, the cradle or the battery is
contaminated, this directive does not apply.
IPX1
0123
CUS

Service Manual Safety Summary 3
Electrostatic Discharge (ESD)
Electrostatic discharge is a sudden current flowing from a charged object to another
object or to ground. Electrostatic charges can accumulate on common items such as
foam drinking cups, cellophane tape, synthetic clothing, untreated foam packaging
material, and untreated plastic bags and work folders, to name only a few.
Electronic components and assemblies, if not properly protected against ESD, can be
permanently damaged or destroyed when near or in contact with electrostatically charged
objects. When you handle components or assemblies that are not in protective bags and
you are not sure whether they are static-sensitive, assume that they are static-sensitive
and handle them accordingly.
Monitor Front Panel Keys
Select Key and Silence Patient Alarm/Equipment
Alert Key- Selects the choice highlighted on the
menu. During patient alarms, silences the tone at
the monitor and Acuity (if connected) for 90
seconds. During equipment alerts, silences or
acknowledges (dismisses) the alert.
Scroll Up Key and Reset Alarm Tone Key-
Scrolls up menus on the display. During
patient alarms, resets the tone at the monitor
and Acuity (if connected).
Nurse Call Key - When connected to Acuity,
pressing this key sends Acuity a Nurse Call
message.
Scroll Down Key and Main Menu Key- Scrolls
down menus on the display, or causes the
Main Menu to appear if no menu is displayed.
Battery Charger Label and LEDs
Green LED on continuously Battery is fully charged.
Green LED flashing kj Battery is charging.
Green LED flashing very slowly Battery detected and waiting to be charged.
Yellow LED on continuously Something is wrong with the battery or the
charger.
WARNING Electrostatic discharge (ESD) can damage or destroy electronic
components. Handle static-sensitive components only at static-safe workstation.
WARNING Assume that all electrical and electronic components of the monitor
are static-sensitive.
ATTENTION
OBSERVE PRECAUTIONS
FOR HANDLING
ELECTROSTATIC
SENSITIVE DEVICES
CAUTION
SENSITIVE ELECTRONIC DEVICES
DO NOT SHIP OR STORE NEAR STRONG
ELECTROSTATIC, ELECTROMAGNETIC,
MAGNETIC OR RADIOACTIVE FIELDS

4Safety Summary Welch Allyn Micropaq Monitor
• Perform all service procedures in a static-protected environment. Always use
techniques and equipment designed to protect personnel and equipment from
electrostatic discharge.
• Remove static-sensitive components and assemblies from their static-shielding
bags only at static-safe workstations—a properly grounded table and grounded
floor mat—and only when you are wearing a grounded wrist strap (with a resistor
of at least 1 megohm in series) or other grounding device.
• Use only grounded tools when inserting, adjusting, or removing static-sensitive
components and assemblies.
• Remove or insert static-sensitive components and assemblies only with monitor
power turned off.
• Insert and seal static-sensitive components and assemblies into their original
static-shielding bags before removing them from static-protected areas.
• Always test your ground strap, bench mat, conductive work surface, and ground
cord before removing components and assemblies from their protective bags and
before beginning any disassembly or assembly procedures.

2
5
Overview
Purpose and Scope
This document provides instructions for disassembly and assembly, troubleshooting,
functional testing and performance verification for the Micropaq monitor.
This document covers the following monitors:
• Micropaq Model 404 monitor, Masimo version
• Micropaq Model 404 monitor, Nellcor version
• Micropaq Model 402 monitor
For service information about any other monitor, refer to the service manual for that
monitor.
Any service work not described in this manual must be performed by qualified service
personnel at the factory or at an authorized Welch Allyn service center. (For contact
information, see page ii.)
This manual is intended for use only by technically qualified service personnel.
Corrective service is supported to the level of field-replaceable units. Field-replaceable
units include certain subassemblies, service kits, and other parts. All field-replaceable
parts are listed in “Field Replaceable Units” on page 63.
The following activities are not supported:
• Repair and replacement of the main board, radio board, and SpO2board,
• Component-level repair of circuit boards and subassemblies,
• Performance of any service procedure or instruction in any manner other than
exactly described in this manual.
Related Documents
When using this manual, it may be helpful to refer to the following documents:
•Micropaq Directions for Use, 810-1177-XX
• Welch Allyn Products and Accessories, 810-0409-XX
WARNING Failure to observe and adhere to these restrictions could lead to
serious personal injury.
Caution Failure to observe and adhere to these restrictions could damage the
monitor and will invalidate the monitor warranty.

6Overview Welch Allyn Micropaq Monitor
Technical Support and Repair Services
Contact Welch Allyn Technical Support at one of the numbers listed on page ii.
Returning Products
To return a product for service, contact Welch Allyn Technical Support (page ii) and
request a Return Material Authorization (RMA) number.
When requesting an RMA, please have the following information available:
• Product name, model number, and serial number.
• A complete return shipping address.
• A contact name and phone number.
• Any special shipping instructions.
• A purchase-order number or credit-card number if the product is not covered by
warranty.
• A full description of the problem or service request.
Before shipping the monitor, please observe these packing guidelines:
• Remove from the package all hoses, connectors, cables, sensors, power cords,
and other ancillary products and equipment, except those items that might be
associated with the problem.
Service Activity Monitor Battery Charger
Parts Replacement Replace the display, front case (with
connectors and keyboard), rear case.
Contact Welch Allyn Technical Support for
service and monitor exchange policy.
Replace only fuses (see procedure in this
manual). Contact Welch Allyn Technical Support
for service and monitor exchange policy
Calibration None required None required
Periodic Servicea
a. More frequent service may be needed in extreme environments (heat, cold, dust, etc.).
Every 6 months to 2 years (per hospital
protocols):
• Complete functional verification as
described in this manual
• Inspect the monitor for mechanical and
functional damage
• Inspect safety labels for legibility
Every 6 months to 2 years:
• Complete functional verification as
described in this manual
• Inspect the battery charger for mechanical
and functional damage
• Inspect safety labels for legibility
• Inspect the rear panel fuses for compliance
to specified rating
Note Welch Allyn does not accept returned products without an RMA.
Note To ensure safe receipt of your monitor by the service center and to expedite
processing and return of the monitor to you, thoroughly clean all residues from
the monitor before you ship it to Welch Allyn.
United States federal regulations prohibit the processing of any device
contaminated with blood-borne pathogens. Welch Allyn thoroughly cleans all
returned monitors on receipt, but any monitor that cannot be adequately cleaned
cannot be repaired.

Service Manual Overview 7
• Put the monitor, enclosed in a plastic bag with a packing list, into the original
shipping carton with the original packing materials or into another appropriate
shipping carton.
• Write the Welch Allyn RMA number with the Welch Allyn address on the outside
of the shipping carton.
Product Configurations
Configurations for the available model numbers are as follows:
Service Options
Warranty Service
All repairs on products under warranty must be performed or approved by Welch Allyn.
Refer all warranty service to Welch Allyn Factory Service or another authorized Welch
Allyn Service Center. Obtain an RMA number for all returns to Welch Allyn Factory
Service. (See “Returning Products” on page 6.)
Non-Warranty Service
Welch Allyn Beaverton factory service and authorized service centers support non-
warranty repairs. Contact any Welch Allyn regional service center for pricing and service
options.
Welch Allyn offers modular repair parts for sale to support non-warranty service. This
service must be performed only by qualified end-user biomedical/clinical engineers using
this service manual.
Micropaq monitor service training is available from Welch Allyn for biomedical/clinical
engineers. Contact Welch Allyn Technical Support Services for information.
Model Monitoring
Parameters
FlexNet/Acuity
Communication
Enabled
404 ECG, SpO2Yes
402 ECG Yes
Caution Unauthorized repairs will void the product warranty.

8Overview Welch Allyn Micropaq Monitor
Connectors, Indicators and Controls
SpO2Connector
ECG Connector
Visual Alarm Indicator
Liquid Crystal Display
Battery
Nurse Call
Key
Scroll Up Key and Reset Patient Alarm Tone Key
Scroll Down Key and Main Menu Key
Select Key and
Silence Patient Alarm/
Equipment Alert Key
Back
Battery pack latch

Service Manual Overview 9
Indicators
Visual Alarm Indicator
Audible Alarm Indicator
Beeps to indicate a patient alarm, and beeps faster for life-threatening arrhythmia alarms.
Beeps when the equipment needs attention. This beep tone is slower than the patient
alarm tones.
Volume can be configured at Acuity as high, low, or off.
Volume can be configured at Acuity for network connection or for when communications
with the FlexNet network are interrupted.
Controls
Nurse Call
• Sends a Nurse Call message to Acuity when the monitor is connected to Acuity.
Depending on how Acuity is configured, the Nurse Call message may cause the
Acuity Central Station to generate a Nurse Call Alert and/or print a snapshot of the
patient waveform at the Acuity Central Station.
Scroll Up and Reset Patient Alarm Tone
• Scrolls up menus on the display.
• Resets a silenced patient alarm tone.
Scroll Down and Main Menu
• Scrolls down menus on the display.
• Displays the Main Menu.
Select and Silence Patient Alarm/Equipment Alert
• Selects the choice highlighted on the menu.
Green Flashes slowly during normal operation.
Red Flashes during patient alarm. Remains on continuously when alarms are
silenced or suspended.
Yellow Flashes during an equipment alert and while the monitor is not connected to
the network.
Remains on continuously if the operator suspends an alert at Acuity for 90
seconds or acknowledges (dismisses) a low battery alert from the monitor or
Acuity.
Note Flashing green indicates that the monitor is connected to the network but not
necessarily connected to a patient. If the monitor is actively monitoring a
patient, continuous green indicates that no alarms or alerts are detected.

10 Overview Welch Allyn Micropaq Monitor
• During patient alarms, silences the tone at the monitor and Acuity (if connected) for
90 seconds. During equipment alerts, silences or acknowledges (dismisses) the alert
at the monitor and at Acuity.
Battery
Insert the battery to turn on power. Remove the battery to turn off power. (While the
battery is removed, no monitoring occurs.)
Recharge the battery while it is removed from the monitor.
To order a new battery, contact Customer Service (see page ii).
Service Menu
Refer to “Functional Verification” on page 11 for service menus and test screens.
Maintenance
For monitor maintenance information, refer to “Operator Maintenance” in Micropaq
Directions for Use. Covered topics include the following:
• Inspecting and cleaning the monitor and accessories
• Charging or replacing the battery

3
11
Functional Verification
This procedure helps to confirm the proper operation of the Micropaq monitor. No monitor
disassembly is required.
The following equipment is required:
Visual Check
Perform this check if the monitor is being serviced in the field by a biomedical/clinical
engineer.
1. Verify that the rubber gasket is not protruding from the case.
2. Verify that the rubber feet have been installed.
3. Verify that screw covers are in place over all four screws in the battery compartment
and the small recessed connector next to the battery connector.
4. Verify that the correct labels have been applied to the case. (See “Attaching Labels”
on page 48 for Model 404 monitors or “Attaching Labels” on page 60 for Model 402
monitors.)
a. Verify that the correct rear case label and battery label are attached.
b. Verify that the serial number label is attached and that the correct information has
been recorded for the model number, part number and serial number.
c. Verify that the clear label cover has been applied over the serial number label.
Model Required Equipment
402 and 404 • DNI Nevada Inc. Patient Simulator 217A or 214B (or equivalent ECG patient simulator)
• Micropaq ECG Cable (008-0522-XX)
• Fully charged battery
• Access to a properly functioning FlexNet network with an access point within range
404 with Masimo • Micropaq Masimo SpO2 cable (008-0961-XX)
• Masimo adult SpO2 sensor for finger
• BIO-TEK Index 2 Series SpO2 Simulator with optical finger for sensor connection (or equivalent)
404 with Nellcor • Micropaq Nellcor SpO2 cable (008-0754-XX)
• Nellcor adult SpO2 sensor for finger
• BIO-TEK Index 2 Series SpO2 Simulator with optical finger for sensor connection (or equivalent)

12 Functional Verification Welch Allyn Micropaq Monitor
Power-Up Test
1. Disconnect any patient cables connected to the monitor and remove the battery (if
installed).
2. Insert a fully charged battery into the monitor.
During power-up, the monitor performs a comprehensive self test of software. If
software testing is successful, the monitor then tests internal hardware. If all tests
are successful, the monitor completes power-up and displays the initial monitoring
screen.
3. Confirm the following:
• The screen is initially blank for a few seconds, that the LED displays each of the
three colors (red, yellow and then green), and that the monitor emits two short
beeps while booting—a quiet beep followed by a second, louder beep.
• A power-up screen with the model number appears for a few seconds, followed
by an initial monitoring screen with no error messages.
If the monitor does not power up properly, contact Welch Allyn Technical Support (page ii)
for assistance.
System Test
1. Press to access the Main Menu, and then repeatedly press until SERVICE
MENU is highlighted.
2. Press to display the Service Menu screen.
3. Press to highlight SYSTEM TEST, and then press to display the System Test
screen.
Service Menu Screen
System Test Screen

Service Manual Functional Verification 13
4. Press to highlight DISPLAY TEST, and then press to display the Display Test
screen.
5. Press once to highlight CYCLE, and then press .
Press to cycle through all display tests while observing the screen. Watch for any
defects such as pixel deficiencies, stuck pixels, or nonuniform illumination.
Optionally, you can run any of the other display tests (CHECKER 1 through CHECKER
4, and BORDER). Press to exit the display test, and then scroll to another test and
press again to run the highlighted display test.
6. Press to exit the display test and return to the Display Test screen.
7. Press again to exit the Display Test screen and return to the System Test screen.
8. Press as needed to highlight KEYBOARD TEST, and then press to display the
Keyboard Test screen.
9. Observe the screen. For each of the front panel monitor keys ( , , , and ),
press and then release the key.
Confirm that the screen displays PRESSED and then RELEASED for each key.
10. Exit the Keyboard Test screen by quickly pressing one of the keys twice.
11. Repeatedly press as needed to exit the service screens and return to the normal
monitoring screen.
Display Test Screen
Keyboard Test Screen

14 Functional Verification Welch Allyn Micropaq Monitor
ECG Test
1. Turn on power to the ECG simulator.
2. Connect the ECG cable to the monitor and to the ECG simulator.
3. Set the ECG simulator for a normal sinus rhythm.
Confirm that the monitor displays a normal sinus rhythm ECG waveform with a heart
rate that is the same (± 4 bpm) as the input of the ECG simulator.
4. Conduct an ECG Lead Fail test:
a. Remove the far left (LA) lead from the simulator. A skeletal torso appears in the
monitor display, with five dots arrayed on it.
b. In the monitor display, verify that the dot corresponding to the LA electrode is
blinking. Reconnect the LA lead to the simulator.
c. Remove each simulator lead in turn. The corresponding dot blinks with each
removed simulator lead, and stops blinking when the switch is released.
5. Disconnect the ECG cable from the simulator and monitor, and then turn off power to
the simulator.
Model 402: Testing is complete. Remove the monitor battery.
Model 404: Go on to the next section to test SpO2.
SpO2Test (Model 404 Only)
1. Turn on power to the SpO2simulator.
2. Connect the SpO2cable to the monitor and the SpO2sensor.
3. Apply the SpO2sensor to the SpO2simulator optical finger.
4. Set the SpO2simulator manufacturer type (“MAKE”) as appropriate: Masimo or
Nellcor.
5. Set the simulator output to SpO2saturation 94 percent and pulse rate 60 beats per
minute (with no motion artifact selected).
Confirm the following:
• The monitor displays SpO2data and the pulse amplitude indicator is moving.
• The displayed saturation = 94 percent ± 4 counts.
• The displayed pulse rate = 60 ± 4 bpm.
6. Disconnect the sensor from the simulator and the cable, disconnect the SpO2cable,
and remove the monitor battery.

Service Manual Functional Verification 15
Network Test
Observe the screen and confirm that the network connection symbol appears (indicating
that the monitor is communicating with the network).
If the network connection is not yet established, wait a short time (60 seconds or less)
and confirm that the connection symbol appears.
Wireless to Acuity Central Communication
To confirm proper communication between the monitor and the Acuity system:
In an area of RF coverage, perform the following test on each monitor.
1. Insert a newly charged battery into the battery compartment of the monitor. A power-
up screen appears and is soon replaced by a blank monitoring screen.
2. If the network is configured to allow multiple Acuity systems to view the monitor,
select the system from the unit list that will be the primary link in the test.
If this is a single system, or if the monitor is configured to communicate only with a
specific Acuity system, select a patient from the patient list.
3. On Acuity, verify that the Monitor Connecting icon (a blue hourglass) appears in the
Wireless area on the Acuity Central Monitor Map (in the Map View). Wait for the
Monitor Connecting icon to change to an Unconfirmed Patient ID icon.
4. Verify that the proper last four digits of the monitor serial number appear as the Room
Number in the Waveform window and ID screen.
Example of Initial Monitor Screen
No Connection Symbol:
The monitor is searching for a
network connection.
Connection Symbol:
Network connection is established.
Caution Before beginning the following procedure, advise Acuity monitoring
personnel that you will be testing the monitor.

16 Functional Verification Welch Allyn Micropaq Monitor
5. Verify that the LED above the screen in the upper right corner of the monitor is
blinking green. This indicates communication between the monitor and the Acuity
system. Refer to the communication status symbols below, as they appear in the
lower left corner of the monitor display.
Battery Charger Functional Verification
This procedure helps to confirm the proper operation of the monitor battery charger.
• No battery charger disassembly is required.
• A monitor battery is required.
To verify charger function:
1. Remove any batteries installed in the charger battery wells.
2. Unplug the ac power cord from the rear of the charger.
3. Plug the ac power cord into the rear of the charger and observe the charger top panel.
Confirm the following:
• Each green LED blinks in sequence, and then each yellow LED blinks in
sequence. This confirms proper operation of the LEDs and the charger software.
• The green LED by the ac power symbol (at the far right side of the charger’s top
panel) is on, and that no other LED is on.
4. Insert the battery into a battery well and confirm that the corresponding green LED
begins to flash. (The green LED flashes while charging, and remains on continuously
when the battery is fully charged.) Remove the battery.
5. Repeat Step 4 for each of the other seven battery wells.
Replace Fuses in the Battery Charger
If the battery charger ac power cord is connected but the green ac power LED is not on,
the battery charger fuses may need replacement.
To replace the fuses:
1. Disconnect the ac power cord from the rear panel of the battery charger. The fuse
module is located directly beneath the ac power receptacle.
2. Use a small flat-blade screwdriver to pry open the black fuse module.
3. Slide out the fuse module, and then unlatch and slide out the fuse holder.
4. Use the screwdriver to dislodge the two fuses.
Monitor with no access point association.
(Flashing) Monitor with access point association, but no Acuity communication.
Monitor with access point association and Acuity communication.