Welch Allyn Proqaq LT Vital Service manual

Propaq® LT
Vital Signs Monitor

Service Manual

Software version 1.5X

ii Welch Allyn Propaq LT Vital Signs Monitor

Copyright 2007 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 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, cautions, warnings, or statement of intended use
published in this manual.

Welch Allyn, Propaq, Acuity, FlexNet, Smartcuf, and Flexible Monitoring are registered trademarks of Welch Allyn. ParamSet
is a trademark of Welch Allyn.

Masimo, SET, and LNCS are registered trademarks, and FastSAT and APOD are trademarks, of Masimo Corporation.
Possession or purchase of a Masimo SpO

-equipped monitor does not convey any express or implied license to use the

2

device with unauthorized sensors or cables which would, alone or in combination with this device, fall within the scope of
one or more of the patents relating to this device.

Nellcor and Oximax are registered trademarks of Nellcor Puritan Bennett.

Software in this product is Copyright 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:

USA 1800 535 6663

1315 685 4560

Canada 1800 561 8797 China 86 216 327 9631

European Call Center 353 46 906 7790 France 3315 569 5849

Germany 49 747 792 7186 Japan 8133 219 0071

Latin America 1305 669 9003 Netherlands 3115 750 5000

Singapore 656 419 8100 South Africa 2711 777 7555

United Kingdom 44 133 236 3812

Australia 6129 638 3000

800 074 793

This device complies with Part 15 of the FCC rules and with the rules of the Canadian ICES-003. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference and (2) this device must accept any interference
received, including interference that may cause undesired operation.

Caution! Changes or modifications not expressly approved by Welch Allyn could void the purchaser’s authority to operate
the equipment.

REF 810-2712-XX (CD)
REF 810-2710-XX (Printed, English only)

Manual 810-2713-00 A, 12/2007

Welch Allyn, Inc.
8500 SW Creekside Place
Beaverton, OR 97008-7107 USA

Welch Allyn Ltd
Navan Business Park
Dublin Road, Navan
County Meath, Republic of Ireland

www.welchallyn.com

Printed in USA

Contents

1 - Safety summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 - Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

iii

Warnings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

General safety considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Electrostatic discharge (ESD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Purpose and scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Technical support services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Returning products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Product configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Recommended service intervals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Service options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Related documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Service menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 - Troubleshooting and repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Troubleshooting chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Battery use and care. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Service chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Service menus for repair and network troubleshooting . . . . . . . . . . . . . . . . . . . 19

4 - Disassembly and reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Procedures overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5 - Functional verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Functional verification overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Equipment required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Checklist and test results report form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

6 - Replacement parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

A - 35-ml test volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

iv Contents Welch Allyn Propaq LT Vital Signs Monitor

1

1

Warnings

Safety summary

All users of the monitor must read this safety summary and all warning and caution
statements in the manual.

WARNING Place the monitor and accessories in locations where they cannot
harm the patient should they fall from a shelf or mount.

WARNING Do not connect more than one patient to a monitor.

WARNING Do not connect more than one monitor to a patient.

WARNING Do not use the monitor in an MRI suite or hyperbaric chamber.

WARNING To avoid explosion, do not operate the monitor in the presence of

flammable anesthetics.

WARNING Do not use cables with abraded or broken insulation.

WARNING Do not use a monitor that has been damaged. If a monitor has been

damaged, remove it from service until it has been verified for proper operation by
qualified service personnel.

Caution Do not use cables that do not operate properly.

Caution Do not autoclave the monitor.

Caution Autoclave accessories only if the manufacturer’s instructions direct you

to do so. Many accessories can be severely damaged by autoclaving.

Caution Use only accessories recommended or supplied by Welch Allyn. (See
Welch Allyn Products and Accessories, 810-0409-XX.) Always use accessories
according to the manufacturer’s instructions.

General safety considerations

• Frequently check all cables, both electrically and visually.

• If the monitor detects an unrecoverable problem, it displays a brief ‘Fault’
message. (See “Alert Messages and Status Messages”, Propaq LT Vital Signs
Monitor Directions for Use (810-1828-XX.) Report all 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 or at a Welch Allyn authorized service center.

2 Safety summary Welch Allyn Propaq LT Vital Signs Monitor

Electrostatic discharge (ESD)

ATTENTION

CAUTION

SENSITIVE ELECTRONIC DEVICES

DO NOT SHIP OR STORE NEAR STRONG
ELECTROSTATIC, ELECTROMAGNETIC,

MAGNETIC OR RADIOACTIVE FIELDS.

Caution Electrostatic discharge (ESD) can damage or destroy electronic
components. Handle static-sensitive components only at static-safe workstation.

Caution Assume that all electrical and electronic components of the monitor
are static-sensitive.

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.

OBSERVE PRECAUTIONS

FOR HANDLING

ELECTROSTATIC

SENSITIVE DEVICES

Symbols

• 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.

WARNING Indicates conditions that could lead to illness, injury, or death.

Caution In this manual, indicates conditions that could damage equipment or other property.

3

2

Overview

Purpose and scope

This is a reference for periodic preventive maintenance and corrective service procedures
for the Propaq LT monitors, models 802LTAN, 802LT0N, 802LTRN, 802LTAS, 802LT0S,
and 802LTRS.

Corrective service is supported to the level of field-replaceable units. Field-replaceable
units include certain circuit-board assemblies, subassemblies, case parts, and other parts.
All field-replaceable parts are listed in “Replacement parts” on page 69.

WARNING When performing a service procedure, follow the instructions
exactly as presented in this manual. Failure to do so could damage the monitor,
invalidate the product warranty, and lead to serious personal injury.

Caution No component-level repair of circuit boards and subassemblies is
supported. Use only the repair procedures described in this manual.

Note

Repair and replacement of the main board is not supported. Any service work on
the main board must be performed by certified and qualified service personnel at
an authorized Welch Allyn service center. (For contact information, see page ii.)

Repair and replacement of the radio and the antenna is not supported. Any
service work on the radio and the antenna must be performed by certified and
qualified service personnel at an authorized Welch Allyn service center. (For
contact information, see page ii.)

This guide provides troubleshooting information, assembly procedures, and instructions
for functional testing and performance verification. It is intended for use only by
technically qualified service personnel.

This guide applies only to the Propaq LT monitor. For service information about any other
model of the Propaq monitor, refer to the service manual for that product.

Technical support services

Welch Allyn offers the following technical support services:

Telephone support (1-800-289-2501 and 1-503-530-7500)
Loaner equipment
Service agreements
Service training
Replacement service parts
Factory service

4 Overview Welch Allyn Propaq LT Vital Signs Monitor

For information on any of these services, call one of the numbers listed on page ii.

Returning products

To return a product for service, contact Welch Allyn Technical Support and request a
Return Material Authorization (RMA) number.

Note

Welch Allyn does not accept returned products without an RMA.

When requesting an RMA, please have the following information available:

• Product name, model number, and serial number.

• Your customer number.

• A contact name and phone number.

• A complete return shipping address.

• 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.

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.

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.

• 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

Model numbers for the configurations are as follows:

Model Monitoring Parameters FlexNet/Acuity

802LT0N ECG, NIBP, Nellcor SpO

802LTRN ECG, NIBP, Nellcor SpO

802LTAN ECG, NIBP, Nellcor SpO

Communication Enabled

2

2

2

No 007-0160-XX KA

Yes 802.11 FHSS 007-0161-XX KA

Yes 802.11a 007-0384-XX KA

Top-Level
Assembly

Serial #

Prefix

Service Manual Overview 5

802LT0S ECG, NIBP, Masimo SpO

802LTRS ECG, NIBP, Masimo SpO

802LTAS ECG, NIBP, Masimo SpO

2

2

2

Yes 802.11 FHSS 007-0269-XX KA

Recommended service intervals

Interval or condition Action recommended Procedure

Every 6 - 24 months
(per hospital protocols)

Every 36 months Replace the air filter “Replacing the air filter” on page 28

Every 36 months Replace the battery “Removing the lithium ion battery

The battery does not hold a charge Check battery capacity

The monitor has been dropped or
otherwise damaged

The monitor is not functioning
properly

Verify functionality “Functional verification” on page 53

Replace the battery

Verify functionality “Functional verification” on page 53

Verify functionality “Functional verification” on page 53

No 007-0268-XX KA

Yes 802.11a 007-0383-XX KA

assembly” on page 27

“Functional verification” on page 53
“Removing the lithium ion battery
assembly” on page 27

The monitor does not pass the
functional verification

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 4.)

Caution Unauthorized repairs will void the product warranty.

Non-warranty service

Welch Allyn Beaverton Factory Service and authorized Service Centers support non­warranty repairs. Contact any Welch Allyn regional service center for pricing and service
options.

Troubleshoot and repair, and then
verify functionality

Return the monitor to an authorized
Welch Allyn service center

“Troubleshooting and repair” on page 9
“Disassembly and reassembly” on page 23
“Functional verification” on page 53

“Returning products” on page 4

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.

6 Overview Welch Allyn Propaq LT Vital Signs Monitor

II 1mV/cm

Exit

Trends

Snapshots

Setup

Low

Med

80

HR/min

140/78

NIBP mmHg (102)

Resp/min

SpO2

OffOnOn

Alarm Tone

Suspend Audible Alarms:

Setup:

(90 sec)

12

97

%

HALL, ROBERT E.

3456187

3:00:06P

Adult,

Rm 239

Alarms

ECG

NIBP

Timings

High

Service

Configuration

Related documents

Title Reorder Number

Propaq LT Vital Signs Monitor Directions for Use 810-1828-XX

Welch Allyn Products and Accessories 810-0409-XX

Controls

Monitor

Power - Turn the monitor power on or off. Down - Move the cursor down to the next display

item.

Service menu

To access the monitor service menu:

From any main display screen (such as Large Numerics, Dual Waveform, ...):

1. Highlight , HR/PR, SpO2, NIBP, Resp, or , and then press .

2. Highlight Setup (at the bottom of the screen) and press . The setup menu appears.

HALL, ROBERT E.

II 1mV/cm

Action - Act based on what is highlighted. Silence/Reset - Silence the current alarm tone for

90 seconds or reset a silenced alarm tone.

Left - Move the

cursor left to the next display

item; decrease the parameter value.

Display - Cycle to the next configured display
format, or cancel the current control, setup, or

pop-up menu.
Right - Move the cursor right to the next
display item; increase the parameter value.

Up - Move the cursor up to the next display
item.

Snapshot - Record a 21

-second period of numeric

and waveform data.

Start/Stop NIBP - Start or stop an NIBP

measurement.

Cradle

Monitor Release - Press and hold while removing the monitor from the cradle.

Adult,

3456187

Rm 239

3:00:06P

Setup Menu

80

HR/min

Setup:

Suspend Audible Alarms:
Alarm T one

Exit

3. Scroll right ( ) to highlight Service, and press . The service menu appears, with
NIBP and Show Info highlighted.

NIBP mmHg (102)

Alarms

Service

Trends

140/78

ECG

NIBP

12

Resp/min

Timings

Off

Low

Med

Snapshots

97

SpO2

Configuration

(90 sec)

High

Setup

%

Service Manual Overview 7

II 1mV/cm

Exit

Trends

Snapshots

Setup

HR/min

NIBP mmHg

Resp/min

SpO2

Timings

Service

Alarms

ECG

NIBP

Setup

%

STEWART, ANN

7762940

3:00:06P

Adult

Rm ICU 263

(qualified service personnel only).

Select ( ) to enter service menus

Configuration

Exit

NIBP

STEWART, ANN

7762940

3:00:06P

Adult

Rm ICU 263

Service

ECG

SpO2

USB

Radio

Software

Display

Battery

Voltages

Buttons

NIBP

Show Info

NIBP Test

Characterize Pump

STEWART, ANN

II 1mV/cm

HR/min

Alarms

Setup

Service

Select ( ) to enter service menus

(qualified service personnel only).

Exit

Trends

STEWART, ANN

NIBP

Service

Display

NIBP

Show Info

NIBP mmHg

ECG

NIBP

ECG

SpO2

Battery

NIBP Test

7762940

Adult

Rm ICU 263

Resp/min

Timings

Snapshots

7762940

Adult

Rm ICU 263

USB

Voltages

Characterize Pump

3:00:06P

SpO2

Configuration

Setup

3:00:06P

Radio

Software

Buttons

%

Service

Exit

The service menu contains 10 sections:

Section Operations Status displays

NIBP Test NIBP, Characterize Pump Show Info

ECG Setup (Enable/Disable HR/PR Alarms) Parameters

SpO

2

USB (none) Show Info

Radio Monitoring (Monitor the radio), Set Netname Show Info, View and Set Netname

Software (none) View Error Log, View RAM Dump, View System Info

Display Run Pixel Test, Set Bias View Fonts

Battery (none) Show Info

Voltages (none) Show Info

Buttons Test Buttons (none)

(none) Show Info

8 Overview Welch Allyn Propaq LT Vital Signs Monitor

9

3

Troubleshooting and repair

Troubleshooting chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Battery use and care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Service chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Service menus for repair and network troubleshooting . . . . . . . . . . . . . . . . . . . 19

Troubleshooting chart

Caution Replace parts, components, or accessories only with parts supplied or
approved by Welch Allyn. The use of any other parts can lead to inferior monitor
performance and will void the product warranty.

General

Refer to “Service chart” on page 17 for information on the suggested corrective actions.

Symptom Possible cause Possible corrective action

The power-on self-test fails.
(Indicator: 2 yellow LED flashes
followed by an LED flash of any
combination of green, yellow, and
red).

Internal RAM failure. Cycle the power. If the error persists, send the

Software error.

Unexpected reset detected.

monitor to an authorized Welch Allyn Service
Center for service. (See “Returning products”
on page 4.)

“Recoverable Fault.
Restart monitor.“

“System Fault.
Service monitor.“

“System Fault.
Service radio.“

“Battery Fault.
Install new battery.“

“Equipment Alert.
Charger Fault.
Service Charger.“

An invalid condition has been
detected that might be resolved
by restarting the monitor.

An unrecoverable system error
has occurred.

Radio fault detected. Send the monitor to an authorized Welch Allyn

The battery is not performing to
specification.

Charging has timed out (Charger
state 5).

Cradle power board failure. Insert another monitor and battery pack in the

Restart the monitor. If the fault does not
reappear, continue to use the monitor.

Send the monitor to an authorized Welch Allyn
Service Center for service. (See “Returning

products” on page 4.)

Service Center for service. (See “Returning

products” on page 4.)

Install a new battery. “Removing the lithium

ion battery assembly” on page 27.

Remove the monitor from the cradle and
reinsert it, and then attempt again to charge
the battery. If the timeout reoccurs, replace the
battery. “Removing the lithium ion battery

assembly” on page 27.

cradle and verify that the symptoms persist. If
yes, then replace the cradle power board.

“Disassembling the cradle” on page 45.

10 Troubleshooting and repair Welch Allyn Propaq LT Vital Signs Monitor

Symptom Possible cause Possible corrective action

Monitor fails to power up beyond the
initial screen.

Button board not connected. Connect the button board to the main board.

“Separating the top and bottom chassis
halves” on page 29.

Monitor is in the cradle and does not
power up, and the cradle power
indicator is off.

Monitor is latched in the cradle but
does not power up. Power indicator
on the cradle is on.

Monitor battery fails to charge.
DC power is applied but the power
indicator on the cradle remains off.

Monitor battery run time duration is
less than specified.

Yellow indicator on the cradle. Monitor current draw is too high.

The battery is discharged and
the cradle is not powering the
monitor.

Defective power adapter. Replace the power adapter.

The charger input fuse is blown. Replace the fuse. “Replacing the fuse” on

Open the monitor power switch. Replace the bottom chassis (which includes

Problem with the cradle power
board.

Problem with the monitor. Send the monitor to an authorized Welch Allyn

Blown power input fuse on the
charger I/O panel.

The battery is deficient. Replace the battery. “Removing the lithium ion

Radio cannot link up to the
Acuity Central Station.

Cradle circuit breaker is tripped.
Charger state 1.

Monitor has no battery pack.
Charger state 4.

Battery pack temperature is out
of range. Charger state 3.

Battery pack voltage is too low
or the battery fuse is blown.
Charger state 4.

Verify that AC power is on, that the power
adapter is plugged into AC power and into the
cradle, and that the monitor is fully seated in
the cradle.

page 45.

the power switch). “Removing the main board

from the bottom chassis assembly” on

page 34.

Replace the cradle power board.

“Disassembling the cradle” on page 45.

Service Center for service. (See “Returning

products” on page 4.)

Replace the fuse. “Replacing the fuse” on
page 45.

battery assembly” on page 27.

See “Radio” on page 12.

Service the monitor or the cradle.

Install the monitor battery pack. “Removing the

lithium ion battery assembly” on page 27.

Return the battery pack to within the specified
temperature range (0

Replace the battery pack. “Removing the

lithium ion battery assembly” on page 27.

°C - 40°C).

Battery pack fails to charge in
the specified time. Charger
state 5.

Battery cell(s) over voltage;
probably a charge imbalance.
Charger state 7.

Charger board failure. Examine the cradle internal cabling, the cradle

Missing or erroneous LCD characters Faulty LCD. Replace the LCD. “Disassembling the top

Remove the monitor from the cradle and
reinsert it, and then attempt again to charge. If
the timeout reoccurs, replace the battery pack.

“Removing the lithium ion battery assembly”

on page 27.

Replace the battery pack. “Removing the

lithium ion battery assembly” on page 27.

power board, and the interconnect board.

“Removing the power/USB flex connector from
the bottom chassis” on page 44.

chassis” on page 32.

Service Manual Troubleshooting and repair 11

Symptom Possible cause Possible corrective action

Button or buttons inoperative. Faulty button or buttons. Replace the top chassis assembly.

“Disassembling the top chassis” on page 32.

Voltages displayed on the service
menu are out of range.

Repeated occurrence of “SpO
No sensor detected.“

2

Fault.

The NIBP air leak exceeds the
specification.

“Equipment Alert.
NIBP Fault.
Air leak. Check hose.“

Repeated occurrence of “NIBP Fault.
Air leak. Check hose.“

“Equipment Alert.
NIBP Fault.
Kinked or neonate hose.“

“Equipment Alert.
NIBP Fault.
Overpressure condition.“

Main board fault. Send the monitor to an authorized Welch Allyn

Service Center for service. (See page ii.)

The internal SpO2 connector is
loose.

Secure the internal SpO2 connector. “Removing

the main board from the bottom chassis
assembly” on page 34.

Faulty SpO

connector panel. Replace the connector panel. “Removing the

2

patient connector panel from the bottom
chassis” on page 43.

Worn O-ring in the NIBP hose

Try a different NIBP hose or replace the O-ring.

connector.

Deficient NIBP check valve,
bleed valve, or overpressure

Replace the valve. “Removing the NIBP

assembly from the main board” on page 39.

valve.

NIBP tubing not properly
connected.

Connect the internal tubing. “Removing the

NIBP assembly from the main board” on

page 39.

If hoses and external fittings are
not leaking, internal tubing
might be disconnected.

Connect the internal tubing. “Removing the

NIBP assembly from the main board” on

page 39.

Internal tubing is disconnected. Connect the internal tubing. “Removing the

NIBP assembly from the main board” on

page 39.

Internal tubing is damaged. Replace the damaged section of internal

tubing. “Removing the NIBP assembly from the

main board” on page 39.

If the correct hose is connected
and not kinked, then the internal
tubing might be blocked.

Verfify that the internal in-line NIBP pneumatic
components are properly installed, with no
pinching or kinking of tubing. “Removing the

NIBP assembly from the main board” on

page 39.

A transient pressure pulse was

Restart the monitor.
introduced into the cuff via
sudden and excessive patient
motion.

“Equipment Alert.
NIBP Fault.
Calibrating. Please wait.“

“Calibrating.
Minimize motion.“

“Equipment Alert.
NIBP Fault.
Service required. NIBP disabled.“
The NIBP system self-test has failed
3 times without passing.

An NIBP measurement was
attempted within 45 seconds of

Wait 45 seconds after turning on the monitor

before starting an NIBP measurement.
monitor power-up.

An NIBP measurement was
attempted while the NIBP

Wait 15 seconds and retry the NIBP

measurement.
system was performing a
baseline calibration.

Excessive cuff artifact. Reduce patient motion.

Excessive artifact. Minimize patient motion.

NIBP subsystem failure. Send the monitor to an authorized Welch Allyn

Service Center for service. (See “Returning

products” on page 4.)

12 Troubleshooting and repair Welch Allyn Propaq LT Vital Signs Monitor

Radio

Radio-equipped Propaq LT monitors support wireless connection to one of the two types
of Acuity networks.

Model Wireless connection

802LTRN, 802LTRS 802.11 FHSS Acuity network

802LTAN, 802LTAS 802.11a Acuity network

802LT0N, 802LT0S none

In facilities with 802.11a networks, administrators can reconfigure the radio, the Acuity
network, or both, to meet local security or policy requirements. When you send a model
802LTAN or 802LTAS monitor to Welch Allyn for service, the radio is reset to the factory
configuration.

Caution If you send a model 802LTAN or model 802LTAS monitor to Welch
Allyn for service and the monitor is then returned to you, you must reapply any
custom radio settings to the monitor before you attempt to reconnect the
monitor to your Acuity network.

Radio troubleshooting information applies only to radio-equipped monitors. It is not
intended for comprehensive troubleshooting of the Acuity system. To troubleshoot the
Acuity system, refer to the appropriate Acuity service contact for your system.

Symptom Possible Cause Possible Corrective Action

No Acuity connection—network
communication icon ( ) is not
displayed on the monitor screen.

No Acuity connection—network
communication icon with slash
( ) is displayed on the monitor
screen and the yellow indicator
above the screen is lit.

No Acuity connection—network
communication icon with slash
( ) and “Disconnected” are
displayed on the monitor screen,
and the green indicator above
the screen is flashing.

Radio Monitoring service screen
persistently displays “Searching
for access point”; monitor
displays ( ).

Radio Monitoring service screen
persistently displays “Searching
for access point” and “Radio
sleeping”; monitor displays ( ).
(802LTAN/802LTAS)

Display alternates between
“search” and “radio sleeping”.

Wireless communication disabled
in the monitor configuration.

Monitor is out of radio range.

802LTRN/S: RSSI > approx. 60.
802LTAN/S: RSSI > approx. 70.

Netname (ESSID) set wrong. Set the monitor network name to the Acuity

USB connected to the monitor
through the cradle.

Monitor is intentionally
disconnected from the network by
the user.

Monitor radio cannot find a signal
from the network.

The monitor Netname does not
match the Acuity network name.

Use the configuration utility to enable wireless
communication for the monitor.

Move the monitor within range of an Acuity
access point.

network name. (Default: com.protocol.)

Disconnect the USB cable from the cradle.

Use the monitor interface to connect to the
network.

Move the monitor within range of an access
point on the current network.

Verify the Netname.

Move within range of an access point and wait
for up to 3 minutes.

Set the monitor Netname to the Acuity network
name (default: com.protocol).

Service Manual Troubleshooting and repair 13

Symptom Possible Cause Possible Corrective Action

Radio Monitoring service screen
persistently displays “Searching
for access point”; monitor
displays ( ). (802LTAN/802LTAS)

Invalid authentication credentials;
default network settings.

Invalid authentication credentials;

Reset the monitor radio to factory defaults:

1. Enter the service screen.

2. Press simultaneously .

3. Select Yes and press .

Refer to your Acuity network administrator.

custom network settings.

Radio Monitoring service screen
persistently displays “Requesting
an IP address” and ( ) is
displayed on the monitor.

Radio Monitoring service screen
persistently displays “Sending
Acuity broadcast.”

DHCP server is down. Contact Welch Allyn Acuity technical support.

(See page ii.)

DHCP server has no more
addresses.

All Acuity systems with wireless

Contact Welch Allyn Acuity technical support.
(See page ii.)

Wait.

are unavailable.

The Acuity system is at capacity for

Turn off another wireless monitor.

licenses.

Frequent communication faults
with no apparent cause. On the
Radio Monitoring service screen,
TX/RX errors (PERCENT) is > 5%.

Faulty antenna or poor antenna
connection.

Send the monitor to an authorized Welch Allyn
Service Center for service. (See “Returning

products” on page 4.)

Faulty radio connection. Send the monitor to an authorized Welch Allyn

Service Center for service. (See “Returning

products” on page 4.)

Poor radio coverage. Verify that the network has a sufficient density

of access points on the current network.

14 Troubleshooting and repair Welch Allyn Propaq LT Vital Signs Monitor

Battery states and service

State Description Type of State Possible Corrective Action

0 Battery state unknown. Normal transitory. Should not

persist.

1 Battery voltage too high.

(Indication can occur with the
monitor in or out of the cradle.)

2 Battery fully charged. Normal operating state.

3 Battery partially charged. Normal operating state.

4 30 minutes of charge

remaining, undocked.

5 30 minutes of charge

remaining, docked.

6 5 minutes of charge remaining,

undocked.

7 5 minutes of charge remaining,

docked.

8 Battery is exhausted,

undocked.

9 Battery is exhausted, docked. Normal operating state.

10 Battery voltage is too low for

recharging, docked.

Fault—possible cell imbalance
or charger fault

Normal operating state.

Normal transitory state.

Normal operating state.

Normal transitory state.

Normal operating state.

Faulty battery pack. Replace the battery pack. “Removing the

If the state persists, replace the battery
pack. “Removing the lithium ion battery

assembly” on page 27.

Replace the battery pack (“Removing the

lithium ion battery assembly” on page 27)

or the cradle power board (“Disassembling

the cradle” on page 45).

lithium ion battery assembly” on page 27.

Service Manual Troubleshooting and repair 15

Charger states and service

State Description Charger

Status

LED

0 Charger state

unknown.

1 Monitor docked,

No-power fault.

2 Monitor docked,

charging.

3 Monitor docked,

temperature
fault.

4 Monitor docked,

battery voltage
too low for
charging.

5 Monitor docked,

timeout fault.

n/a n/a Normal initial transitory state of

Off Off Normal operating state when the

Yellow On Fault—power to the monitor

Green Green Normal operating state. n/a

Yellow Green Fault—battery pack temperature is

Yellow Green Fault—battery pack can no longer

Yellow Green Fault—Battery pack failed to

Charger

Power

LED

Type of State Possible Corrective Action

very short duration.

monitor is in the cradle and the
cradle is not powered.

Fault state if the cradle fuse is
open.

automatically disconnected by the
cradle. Possible monitor fault.

Fault—no monitor in the cradle,
power input and input fuse OK.

out of range high or low.

be charged.

charge within the specified time.

n/a

If the power adapter is not
connected, connect it.

Replace the fuse. “Replacing the

fuse” on page 45.

Attempt to recharge by removing
the monitor from the cradle and
reinserting the monitor in the
cradle.

If the fault persists, attempt to
recharge another monitor to
determine whether the problem is
with the cradle or with the
monitor main board.

Power board fault. Replace the
power board. “Disassembling the

cradle” on page 45.

Bring the battery pack
temperature into specified range
(0° C - 40° C).

Replace the battery pack.

“Removing the lithium ion battery
assembly” on page 27.

Attempt again to charge by
removing the monitor from the
cradle and reinserting the monitor
in the cradle.

6 Monitor docked,

charging
complete.

7 Monitor docked,

overcharge fault.

8 Monitor not

docked.

Off Green Normal operating state. n/a

Yellow Green Fault—battery pack cells are

unbalanced or the cradle is faulty.

n/a n/a Normal operating state. n/a

Replace the battery pack.

“Removing the lithium ion battery
assembly” on page 27.

Replace the battery pack
(“Removing the lithium ion battery

assembly” on page 27).

Replace the power board in the
cradle (“Disassembling the

cradle” on page 45).

16 Troubleshooting and repair Welch Allyn Propaq LT Vital Signs Monitor

Battery use and care

The battery meets specification when used in an environment between 0° C and 40° C.

• Operating the monitor in a cold environment (below 20° C) reduces battery run time.
When the battery is returned to a warmer environment, battery run time returns to
normal.

• Sustained charging at high temperatures (near 40° C) reduces battery life.

• The battery continues to discharge when removed from the monitor, but at a much
slower rate than if it were in the monitor.

• The battery, when removed from the monitor, discharges more slowly at low
temperatures and more quickly at high temperatures.

• Maintain battery capacity by storing the battery:

• in a discharged state

• removed from the monitor

• in a cool, dry place

Service Manual Troubleshooting and repair 17

Service chart

This chart shows which procedure to use for specific service operations on monitors not
covered by warranty.

Caution Do not service a monitor under warranty. Any service not performed at
a Welch Allyn service center voids the product warranty.

Monitor

Note

Do not attempt to replace any component, including the NIBP pressure
transducers, soldered onto the main board. All service of the main board must be
performed at the Welch Allyn factory service center.

Service Action

Replace the NIBP air filter. “Replacing the air filter” on page 28.

Replace the battery pack. “Removing the lithium ion battery assembly” on

page 27.

Replace the connector panel

Replace the LCD assembly

Replace the top case assembly (with button board and window)

Replace the bottom case assy (with power switch, power flex
cable, and connector panel)

1. “Removing the patient connector panel from the

bottom chassis” on page 43.

2. “Functional verification” on page 53.

1. “Disassembling the top chassis” on page 32.

2. “Set LCD bias” on page 21

3. “Functional verification” on page 53.

1. “Disassembling the top chassis” on page 32.

2. “Functional verification” on page 53.

1. “Removing the main board from the bottom

chassis assembly” on page 34.

2. “Functional verification” on page 53.

Replace the NIBP pump, bleed and dump valves, check valve, or
internal tubing

Update the software Send the monitor to a Welch Allyn service center.

Replace the main board Send the monitor to a Welch Allyn service center.

1. “Removing the NIBP assembly from the main

board” on page 39.

2. “Characterize NIBP” on page 19.

3. “Functional verification” on page 53.

(See “Returning products” on page 4.)

(See “Returning products” on page 4.)

18 Troubleshooting and repair Welch Allyn Propaq LT Vital Signs Monitor

Cradle

Service Action

Replace the fuse

Replace the interconnect board

Replace the power board

Replace the I/O panel

Replace the upper housing

Replace the lower housing

1. “Replacing the fuse” on page 45.

1. “Disassembling the cradle” on page 45.

2. “Functional verification” on page 53.

1. “Disassembling the cradle” on page 45

2. “Functional verification” on page 53.

1. “Disassembling the cradle” on page 45

2. “Functional verification” on page 53.

1. “Disassembling the cradle” on page 45

2. “Functional verification” on page 53.

1. “Disassembling the cradle” on page 45

2. “Functional verification” on page 53.

Service Manual Troubleshooting and repair 19

internal NIBP components.

See the Propaq LT Service Manual

for the NIBP Characterization Procedure.

Show Info

NIBP:

Pump Test

HALL, ROBERT E.

3456187

12:41:32P

Adult,

Rm 239

Audible Alarms Silenced

Service:

NIBP

ECG

SpO2

USB

Radio

Software

Display

Battery

Voltages

Buttons

Characterize NIBP

Characterize NIBP after service to any

Exit

Service menus for repair and network troubleshooting

In addition to the service menus supporting functional verification, these menus support
the following service procedures:

Characterize NIBP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Set LCD bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Check radio status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Note

Before beginning any service procedure, read the entire procedure to verify that
you have all tools and equipment needed and that you understand each step.

Characterize NIBP

NIBP characterization sets the volume constants for the NIBP system to assure proper
cuff detection. You must characterize the NIBP system if any of the following occurs:

• Characterization test failure

• Pump failure

• Internal tubing replacement (any or all)

• Bleed valve, dump valve, or check valve replacement

• Main board replacement or repair

Caution Main board repair must be performed at the Welch Allyn Factory
Service Center. Any change to the main board requires system testing,
calibration, and verification, which can be done only at the Factory Service
Center.

Caution Perform this characterization procedure only if you are prepared and
equipped to perform the “Characterization test” on page 59. To complete this
test, you must have the 35-ml test syringe described in “35-ml test volume” on
page 71.

1. Attach a neonatal hose (008-0265-XX) to the monitor NIBP hose connector. Verify that

2. On the monitor, navigate to the Characterize NIBP screen.

the hose length is 8 feet ± 4 inches (2.44 meters ± 10 cm).

HR/min Setup Service NIBP Characterize NIBP.

HALL, ROBERT E.

Audible Alarms Silenced

Service:
NIBP:

NIBP

ECG

Display

Show Info

Characterize NIBP after service to any

for the NIBP Characterization Procedure.

Battery

Pump Test

internal NIBP components.

See the Propaq LT Service Manual

3456187

Adult,

SpO2

USB

Voltages

Characterize NIBP

Exit

Rm 239

Radio
Buttons

12:41:32P
Software

20 Troubleshooting and repair Welch Allyn Propaq LT Vital Signs Monitor

without cuff to the Propaq LT.

2. Block the open end of the hose.

3. With the hose completely blocked,

Show Info

NIBP:

Pump Test

HALL, ROBERT E.

3456187

12:41:32P

Adult,

Rm 239

Audible Alarms Suspended

Service:

NIBP

ECG

SpO2

USB

Radio

Software

Display

Battery

Voltages

Buttons

Characterize NIBP

1. Connect a standard neonatal NIBP hose

Exit

Select ( ) to initialize NIBP characterization.

press the select button.

PROPER NEONATAL CUFF DETECTION.

Failure to perform the verification can result in

overinflation of neonatal cuffs.

Show Info

NIBP:

Pump Test

HALL, ROBERT E.

3456187

12:41:32P

Adult,

Rm 239

Audible Alarms Suspended

Service:

NIBP

ECG

SpO2

USB

Radio

Software

Display

Battery

Voltages

Buttons

Characterize NIBP

THE VERIFICATION TEST ASSURES

Exit

NIBP Characterized.

Perform verification procedure now.

3. Simultaneously press and to access the NIBP characterization service screens. A
warning message appears: “NIBP characterization affects neonatal cuff detection.”

4. Press to continue. The first steps of the procedure appear:

HALL, ROBERT E.

Audible Alarms Suspended

Service:
NIBP:

NIBP

ECG

Display

Show Info

1. Connect a standard neonatal NIBP hose

2. Block the open end of the hose.

3. With the hose completely blocked,

Select ( ) to initialize NIBP characterization.

Battery

Pump Test

without cuff to the Propaq LT.

press the select button.

Adult,

SpO2

Exit

3456187

USB

Voltages

Radio
Buttons

12:41:32P
Software

Rm 239

Characterize NIBP

5. Follow the steps as presented on the screen.

Note

The standard neonatal NIBP hose (008-0265-xx) can be effectively blocked with
firm thumb pressure over the fitting opening.

Note

In this procedure, ‘the select button’ refers to .

6. Press to begin characterization.

When the characterization is complete, this screen appears:

HALL, ROBERT E.

Audible Alarms Suspended

Service:
NIBP:

NIBP

ECG

Display

Show Info

THE VERIFICATION TEST ASSURES

PROPER NEONATAL CUFF DETECTION.

Failure to perform the verification can result in

Battery

Pump Test

NIBP Characterized.

Perform verification procedure now.

overinflation of neonatal cuffs.

Adult,

SpO2

Exit

3456187

USB

Voltages

Radio
Buttons

12:41:32P
Software

Rm 239

Characterize NIBP

7. Verify the characterization. (“Characterization test” on page 59.)

WARNING Always verify after characterization. Failure to verify a new
characterization could result in overinflation of a neonatal cuff.

Service Manual Troubleshooting and repair 21

Exit

NIBP

ID: SET_D80GH2FK

20:43:54

AdultRmRm

Service

ECG

SpO2

USB

Radio

Software

Display

Battery

Voltages

Buttons

Display

Pixel Test

Bias

Display Bias 3232

Fonts

Use left ( ) or right ( ) to increase/decrease bias.

Set LCD bias

When the display module has been replaced, you must then set the LCD bias.

Note

Perform this test only under fluorescent lighting.

1. On the monitor, navigate to the Bias screen.

HR/min Setup Service Display Bias.

ID: SET_D80GH2FK

Service

Display

Display Bias

Use left ( ) or right ( ) to increase/decrease bias.

Use the controls indicated to set the bias. Bias is optimized when the visible shimmer in
the test pattern is reduced to the minimum level.

Check radio status

NIBP

ECG

Display

Pixel Test

Battery

Bias

Adult

SpO2

Exit

USB

Voltages

Fonts

Radio

Buttons

20:43:54

Software

The Radio Status screens provide information that might be required if you have to
troubleshoot the Acuity system network.

22 Troubleshooting and repair Welch Allyn Propaq LT Vital Signs Monitor

23

4

Disassembly and reassembly

Procedures overview

This describes all disassembly steps required for module-level and board-level service
procedures.

Disassembly is presented here as a sequence of procedures.

Do not perform any unnecessary procedures.

Example: Remove the air filter assembly and replace the air filter only if it appears
that the filter is clogged and is restricting air flow to the pump.

Example: Disconnect and remove the NIBP pump only if you are going to replace the
pump or the NIBP air valve assembly.

Caution Perform all repair procedures at a static-protected station.

Caution Regard all monitor parts as extremely fragile, and execute all procedure

steps with care and precision.

Except where noted, reassembly is the reverse of the disassembly.

Reassembly notes are identified by underlined text.

24 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Screws

Caution Observe recommended screw torque specifications, especially with
screws that secure directly into plastic standoffs.

Note

To avoid mismatching screws and holes, keep the screws for each piece with that
piece as you remove modules, circuit assemblies, and other components.

Following are recommended torque specs for all screws used in the monitor:

Qty. Part number Location Type Size/length Torque

Monitor

2 620-0383-xx Battery Pack Captive screw #6-32, 7/16” 2 inch lbs

4 620-0049-xx Case Machine screw #6-32, 1” 6 inch lbs

2 620-0048-xx Case Machine screw #6-32, ½” 6 inch lbs

4 620-0290-xx Main Board Machine screw #4-40, ¼” 4 inch lbs

1 620-0278-xx Valve bracket Machine screw #4-40, ½” 4 inch lbs

2 620-0290-xx Pump bracket Machine screw #4-40, ¼” 4 inch lbs

4 620-0149-xx Display bracket Thread-forming screw #2-28, ¼” 2 inch lbs

2 620-0408-xx Input flex assy.

bracket

2 630-0260-xx Power/flex conn. Guide pin #4-40, ½” ---

2 620-0418-xx Power/flex conn. Flat washer 0.215 OD ---

Thread-forming screw #4-24, 3/8” 4 inch lbs

2 620-0217-xx Power/flex conn. Kepnut #4-40 Loctite

Cradle

2 620-0423-xx Bed rail hook Shoulder screw M 4x4, hex 12 inch lbs

2 620-0424-xx Bed rail hook Machine screw M 4x5 12 inch lbs

4 620-0188-xx Interconnect Bd. Machine screw #4-20, 3/8” 4 inch lbs

4 620-0188-xx Latch bracket Machine screw #4-20, 3/8” 4 inch lbs

7 620-0415-xx Lower housing Machine screw #6/32, 3/8” 6 inch lbs

3 620-0414-xx Lower housing Washer 0.281” OD ---

1 620-0149-xx I/O panel Thread forming screw #2-28, ¼” 2 inch lbs

1 620-0413-xx I/O panel Nylon washer 0.187” OD ---

Service Manual Disassembly and reassembly 25

Connectors

Note

All connectors are keyed or labeled to facilitate proper connection. Take care to
correctly align all connector halves before attempting to connect them.

Zero insertion force (ZIF) flex cable connectors

ZIF connectors use a sliding outer piece that latches and unlatches to secure and release
the flex cable. ZIF cables cannot be successfully connected or disconnected without
properly unlatching and latching the sliding outer piece.

To disconnect a ZIF cable

1. Using a suitable tool (paper clip, small flat-blade screwdriver, or small needle-nose
pliers), slide the latching piece of the connector away from the connector body and
toward the cable, releasing the cable from the connector.

2. Remove the cable.

To connect a ZIF cable

1. Slide the latching piece of the connector body away from the body.

26 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

2. Insert the flex cable into the connector.

3. Slide the latching piece toward the connector body until it clicks into place.

Connector locations

Connector Connects with: Connector Connects with:

J1 ECG (flex) J1 Cradle power board (3-conductor)
J2 On/Off Switch J2 Cradle power board (10-conductor)
J3 SpO
J4 Display module P1 Propaq LT Monitor
J5 BDM Charging Cradle - Cradle Power Board
J6 PCMCIA (radio) card J1 I/O panel (DC input)
J7 Button pad J2 Cradle interconnect board (10-conductor)
J8 Battery pack J4 Cradle interconnect board (3-conductor)
J9 Pump/bleed valve Radio Card

J10 Dump valve (flex) Antenna
J11 Speaker

P2 Power/USB (flex)

Caution Do not attempt to remove a flex cable until the ZIF latch has been
opened.

Caution Never attempt to disconnect any cable by pulling on the cable wires.
Always disconnect cables by grasping and pulling only on the connector halves.

Main Board Charging Cradle - Interconnect Board

(flex) JP1 External USB

2

Service Manual Disassembly and reassembly 27

Procedures

Removing the lithium ion battery assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Replacing the air filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Separating the top and bottom chassis halves . . . . . . . . . . . . . . . . . . . . . . . . . .29

Disassembling the top chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Removing the main board from the bottom chassis assembly . . . . . . . . . . . . . .34

Removing the NIBP assembly from the main board . . . . . . . . . . . . . . . . . . . . . .39

Removing the patient connector panel from the bottom chassis . . . . . . . . . . . .43

Removing the power/USB flex connector from the bottom chassis . . . . . . . . . .44

Disassembling the cradle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Removing the lithium ion battery assembly

WARNING The lithium ion battery can deliver currents sufficient to cause
serious personal injury and to damage the monitor. Before opening the monitor
for any reason, and before you begin any procedure described in this manual,
always remove the battery first.

WARNING The only safe method for charging the monitor battery is to insert the
completely assembled monitor, with the completely assembled battery pack
correctly installed, into the completely assembled charging cradle. Attempting to
charge the monitor battery by any other method creates a significant risk of
explosion or patient shock hazard.

WARNING Do not short the battery connector pins.

WARNING Do not attempt to disassemble the battery. The battery pack

contains no user-serviceable parts.

in

Note

The battery pack assembly consists of the rechargeable lithium ion cells, a protection
board, and the battery door. It can be replaced only as an assembly.

1. Remove the two screws securing the battery door.

When the monitor, the cradle, or the battery reaches end of life, recycle it locally
according to national, state, and local regulations, or return it to Welch Allyn.

Two screws securing
the battery door
Reassembly: 2 inch lbs

2. Remove the battery assembly from the battery compartment.

28 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Battery compartment

Battery assembly

Battery door

Replacing the air filter

Note

1. Remove the air filter assembly.

It is not necessary to replace the air filter each time you service or repair the
monitor. See “Recommended service intervals” on page 5.

Air filter assembly

Housing

2. Remove and discard the air filter, and replace it with a new one.

Service Manual Disassembly and reassembly 29

Air filter

3. If the O-ring shows signs of wear, replace it with a new one.

REASSEMBLY:

Lubricate the outside of the O-ring with a drop of alcohol to prevent it from riding up the
side of the cylinder when inserted.

When properly installed, the filter cylinder is perfectly flush with the chassis surface.

Cylinder flush with
chassis surface

Separating the top and bottom chassis halves

1. “Removing the lithium ion battery assembly” on page 27.

2. Remove the four cylindrical rubber plugs from the screw holes in the bottom chassis.

REASSEMBLY:

When reinstalling the rubber plugs, lubricate the screw holes with water applied with a
damp cotton swab.

Rubber plugs removed

30 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

3. Remove the screws from the bottom chassis.

• Remove three screws from the top and one from the bottom left corner.

• Remove two screws from inside the battery compartment.

Rear chassis screws

Reassembly: 6 inch lbs

4. With the monitor face-up, lift the bottom of the top chassis enough to access the
speaker cable, and disconnect the speaker cable from J11 on the Main board.

Speaker cable

J1 connector (speaker)

5. Rotate the monitor 180° to access the top of the top chassis.

6. Disconnect the blue button pad cable from ZIF connector J7.

Button pad cable

Button pad cable connector (J7)

7. Rotate the monitor 90° to access the display cable connector (J4).

8. Disconnect the display cable from connector J4.

Service Manual Disassembly and reassembly 31

Display cable

Display cable
connector (J4)

9. Remove the slotted blue gasket that runs around the chassis halves.

REASSEMBLY:

The slotted blue gasket between the top and bottom chassis halves is directional; it can
be correctly aligned in only one way. Take care to reinstall the gasket correctly.

32 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Disassembling the top chassis

The top chassis assembly contains the top plastic panel assembly (including the
integrated overlay for buttons, window, LEDs, and trim), the display module, and the
speaker.

1. “Removing the lithium ion battery assembly” on page 27.

2. “Separating the top and bottom chassis halves” on page 29.

3. Remove the display module.

Caution Take care to protect the front surface of the display module and all
surfaces of the display screen from scratching and contamination.

a. Remove the four screws from the display bracket, and remove the bracket to free

the display module.

Bracket screws
Reassembly: 2 inch lbs

Display module (back side)

Bracket

Bracket screws
Reassembly: 2 inch lbs

REASSEMBLY: The display module cable lies under the bracket.

b. Remove the display module.

REASSEMBLY:

Tighten the display bracket screws to a torque of 2 inch lbs. Take care to avoid stripping
the plastic screw mounts.

Gaskets

Service Manual Disassembly and reassembly 33

c. Remove the rubber gaskets from the display module.

d. Set aside the display module, protecting the display surface from damage.

Display surface

4. Remove the speaker.

REASSEMBLY:

Before removing the speaker, note the alignment of the speaker cable terminals for
rerouting the cable.

Speaker cable terminals

Speaker cable connector

a. Pry the speaker from the adhesive gasket securing it to the chassis.

b. Remove any remaining gasket pieces from the front panel and discard them.

REASSEMBLY:

1. Install a new gasket.

2. Align the new speaker for proper cable routing.

3. Seat the speaker on the gasket.

34 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Removing the main board from the bottom chassis assembly

Caution Do not touch, move, or adjust the radio antenna. The radio antenna is
extremely fragile and is exposed during this procedure. If the antenna is
damaged, the monitor must be returned to a Welch Allyn authorized Service
Center for repair.

1. “Removing the lithium ion battery assembly” on page 27.

2. “Separating the top and bottom chassis halves” on page 29.

3. Disconnect the power/USB flex cable from the main board connector (P2).

Power/USB cable

Ferrite bead

4. Remove the four screws holding the main board to the bottom chassis.

Service Manual Disassembly and reassembly 35

Main board screws
Reassembly: 4 inch lbs

5. Lift the top of the main board slightly away from the chassis to access the NIBP
tubing connection to the air inlet/filter.

Lift this side of the main board slightly
to access the NIBP tubing connection
underneath

6. Disconnect the NIBP tubing from the air inlet/filter port.

Caution Do not apply tool edges or serrations to the tubing. The tubing is
fragile, especially at the joints. To avoid damaging the tubing, disconnect using
only your fingers or unserrated pliers.

REASSEMBLY: When you reassemble the bottom chassis, verify that the radio card and
the antenna are still in the correct positions:

36 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

ferrite bead in place

foam tape (white) in place

antenna tucked inside the
chassis

Note

If the radio card or the antenna has been moved out of position, return the
monitor to a qualified Welch Allyn service center. The radio and the antenna are
not field-serviceable components.

REASSEMBLY: When reconnecting the tubing, lubricate the inlet port, using a cotton
swab dampened with water.

NIBP tubing

Dampened cotton swab

Air inlet filter port

7. Disconnect the ECG (flex) cable from ZIF connector J1 on the back of the main board.

J1

ECG flex cable

Service Manual Disassembly and reassembly 37

REASSEMBLY:

When reconnecting the ECG cable, be certain that the cable leads are perpendicular to
the board and to the ZIF connector before you lock the connector clips.

8. Disconnect the SpO2 (flex) cable from connector J3 on the back of the main board.

J1 (ECG)

J3 (SpO2)

SpO2 flex cable

ECG flex cable

9. Disconnect the tubing section at the point shown here:

Disconnect the tubing here

10. Disconnect the power switch cable from connector J2 on the back of the main board.

38 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Power switch cable
connector J2

11. Remove the main board.

Main board with
NIBP module

Service Manual Disassembly and reassembly 39

Removing the NIBP assembly from the main board

WARNING After replacing any part of the NIBP assembly, you must
characterize NIBP. Failure to characterize NIBP could lead to excessive cuff
pressure for neonatal patients.

This procedure consists of 3 parts:

• Part 1: Removing the Tubing

• Part 2: Removing the Pump

• Part 3: Removing the Valve Assembly

. Depending on what you are replacing, do one of the following:

•Part 1

• Parts 1 and 2

• Parts 1 and 2 and 3

NIBP disassembly, part 1: Removing the tubing

1. “Removing the lithium ion battery assembly” on page 27.

2. “Separating the top and bottom chassis halves” on page 29.

3. “Removing the main board from the bottom chassis assembly” on page 34.

\

Caution Use extra care when handling the tubing. The tubing, especially at the
joints, is very fragile.

• Never use sharp-edged tools to grip or remove the tubing.

• Always grip the tubing as close as possible to the point of contact with the

connector.

Pump

Valve assembly

Tub in g

Pressure transducers

4. Disconnect the two tubing sections from the pump.

40 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

REASSEMBLY:

The pump input (suction) port is slotted and is oriented away from the main board. The
output port (pressure) is not slotted and is oriented toward the main board.

Input (smaller hole, with slot)

5. Disconnect and set aside the three tubing assemblies.

NIBP disassembly, part 2: Removing the pump

Output (larger hole, without slot)

Input (to smaller hole,
with slot)

Output (to larger hole,
without slot)

6. Note the relative positions of the pump, the pump wires, and the cable ties securing
the pump.

Service Manual Disassembly and reassembly 41

Cable ties

Pump wires

7. Note how the two pump wires are connected to the pump.

Red wire to the
+terminal

Red

Black

8. Desolder the two pump wires connected to the pump.

9. Clip the pump cable ties.

REASSEMBLY:

Secure the pump wires INSIDE the cable ties. Position the pump and replacement cable
ties in the locations noted in step 6 on page 40. The back of the pump should align with
the back of the pump bracket. Note that the pump wires go inside the cable ties as
shown:

NIBP disassembly, part 3: Removing the valve assembly

Black wire to the
unmarked terminal

Cable ties

Pump wires

10. Note the routing of the cable pack through the notch in the bottom of the valve
assembly.

42 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Cable routing notch

11. Remove the single screw securing the valve assembly to the main board.

Screw
Reassembly: 4 inch lbs

Pressure transducers

Caution Do not attempt to remove the pressure transducers. The pressure
transducers are not user-serviceable.

Caution Take extra care to protect the pressure transducers as you remove the
valve assembly.

12. Lift the valve assembly straight up and off of the pressure transducers.

Pressure transducers

Service Manual Disassembly and reassembly 43

Removing the patient connector panel from the bottom chassis

1. “Removing the lithium ion battery assembly” on page 27.

2. “Separating the top and bottom chassis halves” on page 29.

3. “Removing the main board from the bottom chassis assembly” on page 34.

4. Remove the clear plastic cover from the ferrite beads by removing the two screws
(one is under a strip of foam tape) securing it to the chassis.

Reassembly: 4 inch lbs

5. Pry the ferrite beads from the adhesive on the bottom case.

Caution The ferrite beads are extremely brittle and can chip or crack if
mishandled.

6. The connector assembly is held in place by the two snap-in clips and by an adhesive
gasket. Remove the assembly by pushing in the clips while applying upward pressure
on the assembly to break the grip of the gasket.

Caution The clips are fragile. Excessive bending will break them.

screwdriver tip

REASSEMBLY:

clip detail

44 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Remove all adhesive tape from the ferrite beads and remove all pieces of the adhesive
gasket. Use all new adhesive tape on the ferrite beads and a new adhesive gasket on the
connector assembly.

Removing the power/USB flex connector from the bottom chassis

1. “Removing the lithium ion battery assembly” on page 27.

2. “Separating the top and bottom chassis halves” on page 29.

3. “Removing the main board from the bottom chassis assembly” on page 34.

4. Remove the two hex nuts from the rear of the flex connector.

5. Remove the connector guide posts from the connector well.

Caution Use extra care during this procedure to protect all components of the
flex circuit.

Note

6. Remove the Power/USB flex connector assembly.

REASSEMBLY:

The hex nuts and the connector guide posts cannot be reused after removal. The
hex nuts are secured with Loctite adhesive. Removing the nuts damages them
and damages the guide posts.

(1) Install the washers onto the new connector guide posts.

(2) Seat the guide posts inside the connector well, noting the proper alignment of the flat
side of the guide posts.

(3) Install the flex connector assembly.

(4) Add threadlocker to the screws and tighten the hex nuts enough to slightly compress
the foam pad.

Service Manual Disassembly and reassembly 45

Disassembling the cradle

Note

Replacing the fuse

3A, slow blow, 2AG

1. Remove the fuse cover by rotating it (using a screwdriver) 90° counterclockwise.

2. Remove and replace the fuse.

To facilitate reassembly, observe carefully while disassembling.

T3A/250V

12-28V

3A

fuse cover

3. Replace the fuse cover.

Removing the bed rail hook

1. Remove the two screws securing the handle to the rear of the cradle.

Reassembly: 12 inch lbs

2. Slide the handle up and off of the shoulder screws.

46 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Removing the lower housing, I/O panel, and power board

1. Remove the seven machine screws from the bottom of the lower housing.

Bottom chassis screws (7)

Reassembly: 6 inch lbs

REASSEMBLY:Note the three screw holes that have nylon washers. These washers must
be used in these screw holes.

Nylon washers

2. Remove the threadlocking screw and nylon washer from the bottom of the I/O panel.

I/O panel screw

Reassembly: 2 inch lbs

USB-equipped models only:

bend this rubber plug out to
remove the bottom chassis.

(detail)

Service Manual Disassembly and reassembly 47

3. With the AC power adapter unplugged from the wall, plug the AC power adapter
into the cradle AC power input connector.

4. Using the AC power adapter connector for leverage, carefully rock the I/O panel from
side to side to break the bond of the adhesive gasket, and then separate the I/O panel
from the upper housing.

Note

Do not attempt to save the adhesive gasket around the I/O panel. This gasket
cannot be reused.

5. Remove and discard all pieces of the I/O panel adhesive gasket.

6. Unplug the AC power adapter from the cradle.

7. Separate the upper and lower cases.

48 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

Power board

Interconnect board

8. Carefully detach the thin, black rubber seal from the upper case.

REASSEMBLY: Carefully install the thin, black rubber seal in the trough in the lower case
before joining the upper and lower case halves.

REASSEMBLY: When the rubber seal is properly installed, the ends of the seal extend into
the I/O panel opening.

opening for I/O panel

tubing ends

Service Manual Disassembly and reassembly 49

REASSEMBLY: Align the power board with the slots in the lower cradle housing.

lower cradle housing

power board

alignment
slots

REASSEMBLY: When closing the cradle, bend the white insulator on the power board to
slide along the wall of the lower cradle housing.

lower cradle housing

insulator

9. Note the routing of the J1 cable on the Interconnect board for later reassembly.

50 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

J2

J1

10. Disconnect J1 and J2 from the Interconnect board.

11. Remove the Power board and I/O panel by sliding the Power board out from the slots
in the upper housing.

J1

12. Disconnect the I/O panel connector from J1 on the Power board.

J1

Service Manual Disassembly and reassembly 51

REASSEMBLY:

(1) Clean all remnants of adhesive from the upper and lower cradle cases, and from the I/
O panel if you are reusing it.

(2) Apply a new adhesive gasket to the I/O panel.

Note: On USB-equipped cradles, keep the USB port cover out of the way during
reassembly.

(3) Connect the I/O panel to J1 on the Power board.

(4) Install the Power board into the slots in the upper housing.

(5) Set the I/O panel in place, but do not remove the protective film from the adhesive
gasket until the lower cradle housing is installed.

Removing the interconnect board

1. Remove the four screws securing the Interconnect board to the upper housing and lift
the Interconnect board from the housing.

Note

Removing the latch

1. Remove the four screws holding the latch bracket, and remove the bracket.

Alignment slot

Interconnect board

Reassembly: 4 inch lbs

An early version of the Interconnect board included a photosensor attached by a
4-wire cable. If this photosensor and cable are present, clip the cables close to
the board and remove the cable and photosensor.

Latch bracket screws (4)

Alignment pinhole

Reassembly: 4 inch lbs

52 Disassembly and reassembly Welch Allyn Propaq LT Vital Signs Monitor

2. Remove the two latch springs by compressing them and lifting them off of the posts.

REASSEMBLY: Note the small alignment slot on one side of the bracket and the small
alignment hole on the other.

3. Remove the latch from the upper housing.

Note

Interconnect boards shipped in early-production cradles included a photosensor
assembly that is no longer used. Later Interconnect boards do not have the
photosensor assembly.

• If you are reusing the original interconnect board, leave the reflective foil

intact; otherwise, disregard the reflective foil.

• If you are replacing the latch, the replacement latch on the replacement board

might not look like the original.

Reassembly: Install the blue button cap on the latch. Orient the flat side of the cap toward
the catch.

Foil reflector used for some early-production cradles with
photosensor. (See the notes on this page and the previous page.)

Latch catch

The flat side of the blue cap is on the same side as the latch catch.

53

5

Functional verification

Functional verification overview

This section describes the procedure for a complete functional test to support
recommended preventive-maintenance schedules.

Equipment required

The following equipment is required for functional verification of a fully configured
monitor.

Commercially available general-purpose/medical test equipment

Item Manufacturer part number/specification

Power supply Variable, 0-28 VDC, 0.100A (minimum), with voltage and current

Digital pressure meter Netech Digimano 1000 or equivalent

AC withstand voltage (hi-pot) tester Associated Research 3605 or equivalent

Hi-Pot Return Test Probe Associated Research 38082 Return Retractor

indicators (for 1mA current measurement)

Hi-Pot High Voltage Test Probe Associated Research 38083 Safe-T Probe (High Voltage Test Gun)

ECG Simulator Fluke 217A or Equivalent

simulator (to test the monitor and SpO2 sensor) Fluke (Biotek) Index2 XL/XLFE or equivalent

SpO

2

Masimo SpO

Nellcor SpO

Syringe, 60-ml, Slip-tip, Luer BD (Becton, Dickinson) 309654 or equivalent

2

Functional tester, Masimo SET
(to test the monitor only)

Cable, Masimo SET, DB9-LNCS (4’, 10’, or 14’) LNC-04-WA 4’ LNCS cable or

Adapter cable, Masimo 1645, MAC-1 SpO2 adapter cable (LNOP-to-LNCS)

2

Functional tester (to test the monitor only) Nellcor SRC-MAX

Extension cable (required for SRC-MAX) Nellcor DEC-8

Masimo SET Tester 1795

LNC-10-WA 10’ LNCS cable or
LNC-14-WA 14’ LNCS cable

54 Functional verification Welch Allyn Propaq LT Vital Signs Monitor

Welch Allyn accessories and test equipment

ECG cable, 4’, 5-lead 008-0522-00 (AAMI) or 008-0522-01 (IEC)

NIBP Hose, Neonatal, 8’ 008-0265-XX

Neonatal #1 cuff, disposable, box of 10 008-0620-XX

Adult Cuff 008-0628-XX

NIBP Hose, Adult 008-0864-XX

DC Input Cable 008-0290-XX

DC power adapter 503-0142-XX

Procedures

Charging cradle

This procedure verifies charger operation. It does not verify charger accuracy. Voltage and
current are reported on the service screens with wide tolerances, due to measurement
limitations of the monitor and limitations in how the cradle reports charging currents.
Charger voltages and currents are tested to very narrow tolerances at the factory.

Inspecting the monitor connector

Inspect the 17-pin monitor connector to verify that it is clean and free of debris.

Partially discharging the battery

With the monitor out of the cradle, run the battery for several hours or until it does a low­battery shutdown (whichever occurs first).

Charging/LED operation

1. Observing correct polarity, connect the DC input cable (008-0290-XX) to the power
supply.

2. Set the power supply for 28 VDC.

3. Connect the DC input cable from the power supply to the cradle.

4. With the monitor removed from the cradle, verify that the input current to the cradle
is less than 50 mA, the power indicator on the cradle is green, and the status indicator
on the cradle is off.

5. Disconnect the power cable from the cradle and the power supply.

6. Connect the AC power adapter (503-0142-XX) to the cradle, and verify that the power
indicator on the cradle is ON and the status indicator on the cradle is OFF.

7. Remove the battery pack from the monitor and plug the monitor into the cradle. This
causes the monitor to power up.

8. Verify that the status indicator on the cradle is yellow.

9. Navigate to Setup > Service > Battery and press .

Service Manual Functional verification 55

NIBP

ID: SET_CAOJ1T9L

3:00:06P

AdultRmRm

Service

ECG

SpO2

USB

Radio

Software

Display

Battery

Voltages

Buttons

Battery

Show Info

Exit

NIBP

ID: SET_CAOJ1T9L

3:00:06P

AdultRmRm

Service

ECG

SpO2

USB

Radio

Software

Display

Battery

Voltages

Buttons

Battery

Show Info

Battery Information

SN
V BAT

7.83

044801

Charge current
Battery state
Charger state

3

0.84

2

ID: SET_CAOJ1T9L

NIBP

Service

Battery

Display

Show Info

ECG

Battery

ID: SET_CAOJ1T9L

NIBP

Service

Battery

ECG

Display

Show Info

Battery Information

SN
V BAT

Charge current
Battery state
Charger state

Battery

Adult

SpO2

Adult

SpO2

USB

Voltages

USB

Voltages

044801

7.83

0.84

Radio

Buttons

Radio

Buttons

3:00:06P

Software

3:00:06P

Software

Exit

10. Verify that V BAT is between 6.06 V and 6.34 V.

11. Verify that the charger state is 4.

12. Verify that the battery icon on the battery is red and that it contains no lightning bolt.

13. Press to start the NIBP pump.

14. Verify after several seconds that V BAT is between 8.25 V and 8.55 V.

15. Turn off the monitor.

16. Remove the monitor from the cradle and reinstall the partially discharged battery
pack. The monitor powers on when the battery pack is connected.

17. Install the running monitor in the cradle and verify that the status indicator on the
cradle is green.

18. Navigate to Setup > Service > Battery > Show Info.

19. Verify that the charge current is between 800 mA and 1100 mA and that the charger
state is 2.

20. Verify that the battery icon on the monitor is green with a lightning bolt.

21. Press to start the NIBP pump.

22. Verify after several seconds that the charge current is between 150 mA and 220 mA.

23. Press to stop the NIBP pump.

24. Leave the monitor in the cradle until the status indicator on the cradle goes off.

25. Verify that the battery icon on the monitor display contains no lightning bolt.

26. Navigate to Service > Battery > Battery Info and verify that the charger state is 6.

27. Remove the monitor from the cradle and let the monitor continue to run for a minute.

28. Install the monitor in the cradle and verify that the status indicator on the cradle is
briefly green and then goes off.

56 Functional verification Welch Allyn Propaq LT Vital Signs Monitor

Charge time (optional procedure)

A normally discharged battery pack typically requires 3 hours (4 hours maximum) to fully
charge, whether the monitor is on or off during charging.

Note

1. Plug the monitor with the discharged battery into a powered cradle, in an environment

2. Note the time required for the status indicator on the cradle to change from green to

System tests

With the battery fully charged:

1. Power-on the monitor, observing the power-up sequence to verify that all three LED

2. Start a new patient.

3. Highlight and press .

4. Navigate to Setup > Service > Voltages/Show Info and press .

5. Verify that the displayed (measured) values for each supply are within the ranges

6. Navigate to Service > Display > Pixel Test and press twice.

A normally discharged battery pack is one on which a monitor has recently run for
more than 5 minutes just before a low-battery shutdown.

with temperature in the range 0° C to 40° C.

off.

indicators light and that all three audio tones sound.

shown on the screen.

ECG

7. Using the navigation arrows, cycle through the six colors on each
verifying that all pixels are displayed in all colors and with uniform accuracy and
brightness.

8. Press to exit the Pixel test.

9. Go to the Buttons test and press twice.

10. Push each button and verify that all button presses are shown.

11. Press and simultaneously to exit the Buttons test.

12. Navigate to Service > Battery > Battery Info.

13. Verify that the charger state is 8.

14. Exit the Service menu.

1. Connect a 5-lead ECG cable between the monitor and the ECG simulator.

2. Set the simulator for Lead II, normal sinus, 80 bpm, 1 mv.

3. Press as needed to view a waveform display.

4. Highlight ‘II’ and press to the display the Waveform Source drop-down menu.

screen half,

Service Manual Functional verification 57

%

STEWART, ANNSTEWART, ANN 77629407762940 15:14:28

Adult

2Rm ED 263

HR/min

NIBP mmHg

Resp/min SpO2

II 1mV/cm

80

12 97

Waveform Source

Lead I
Lead II 6 sec
Lead III
aVR
aVL
aVF

V

Resp
SpO2
Add 2nd Wave

Adult

II 1mV/cm

Waveform Source

Lead I
Lead II 6 sec
Lead III
aVR
aVL
aVF

Resp
SpO2

80

Add 2nd Wave

HR/min

5. Highlight each ECG Lead (I, II, III, and V) and verify that for each one:

• a waveform is present

• heart rate is 80 bpm ± 3 bpm

6. Remove one lead and verify that the monitor displays an equipment alert identifying
the failed lead: “Equipment Alert/ECG Fault/xx Lead failed”.

7. Replace the lead and wait for the waveform to reappear.

NIBP mmHg

Rm ED

12

Resp/min

Respiration

8. Repeat Step 6 and Step 7 for each lead.

9. Reconnect all leads.

10. Set the ECG simulator to a paced signal.

11. Set the monitor pacer indicator ON (Setup > ECG > Pacer Indicator).

12. Verify that the monitor ECG waveform displays the pacers as vertical dashed markers.

mV
cm

Pacemaker signal indicators

1. Set the Resp parameters on the ECG simulator to:

• 20 breaths/minute

• breath size = 1 ohm

• base impedance between 200 and 1200 ohms

• Lead Select to lead I

2. On the monitor, turn on Resp.

3. Set the Waveform Source to Resp. (See Step 3 and Step 4 in “ECG” on page 56.)

4. Set the monitor Resp Lead to Ld1 (RA-LA). (Resp/min Resp Lead.)

5. Verify that the monitor displays a Resp waveform with a rate of 20 bpm ± 2 bpm.

6. Switch the respiration simulator lead to lead II.

7. Set the monitor Resp Lead to Ld2 (RA-LL).

58 Functional verification Welch Allyn Propaq LT Vital Signs Monitor

8. Verify that the monitor displays a Resp waveform with a rate of 20 bpm ± 2 bpm.

SpO2

Test either the monitor or the monitor with the sensor, as required for your application.

Note

If the default simulation values are outside the monitor alarm limits, either adjust
the alarm limits or silence the alarms when they occur.

Testing the Model 802LTxN monitors only

1. Power-off the monitor.

2. Connect the Nellcor SRC-MAX SpO
through a Nellcor DEC-8 extension cable.

3. Power-on the monitor.

The simulator flashes some LED indicators and initializes to a default condition in
which the four test parameter indicators are lit closest to their respective selector
buttons. The default should be 60 bpm and 75% saturation.

4. When the monitor display stabilizes, verify the following:

• pulse rate is 60 bpm ± 3 bpm

• saturation is 75% ± 3%

5. Switch the simulator to 200 bpm.

6. When the monitor display stabilizes (which could take as long as 30 seconds), verify
that the pulse rate is 200 bpm ± 3 bpm.

7. Switch the simulator to 90% saturation.

Functional Tester to the SpO2 input connector

2

8. When the monitor display stabilizes, verify that the saturation is 90% ± 3%

9. Disconnect the simulator.

Testing the Model 802LTxS monitors only

1. Connect the Masimo 1795 SET SpO
cable (4’, 10’, or 14’) and a Masimo 1645 MAC-1 adapter cable (LNOP-to-LNCS).

2. When the monitor display stabilizes, verify the following:

• Pulse rate from SpO

•SpO

saturation = 81% ± 3%

2

3. Disconnect the simulator.

Testing the monitor and the sensor

1. Set the Fluke Index2 SpO

Ty pe = [ Masimo or Nellcor], % = 94, Rate = 60, motion artifact = No

2. Let the simulator warm up for at least 5 minutes.

3. Connect a sensor to the optical finger of the simulator and to the monitor.

4. When the monitor display stabilizes, verify a saturation reading of 94% ± 4% and a
pulse rate of 60 bpm ± 4 bpm.

Tester to the monitor via a Masimo DB9-LNCS

2

= 61 bpm ± 1 bpm

2

simulator to:

2

Service Manual Functional verification 59

NIBP

Characterization test

1. Attach a neonatal hose (008-0265-XX) to the monitor NIBP air connector.

2. Connect the test syringe, set to a volume of 35 ml, to the neonatal hose. (See “35-ml

test volume” on page 71.)

Leak rate test

Note

3. Set the monitor patient mode to Adult.

4. Start an NIBP reading.

5. Verify that the monitor displays the message “Equipment Alert/NIBP Fault/Kinked or

Note

The syringe plunger must not move when pressure is applied to the syringe
cylinder.

neonate hose”.

WARNING If the message “Kinked or neonate hose” does not appear, remove
the monitor from service. Characterize NIBP (“Characterize NIBP” on page 19)
and then repeat this Characterization Test. If the monitor cannot pass the
Characterization Test, return it immediately to an authorized Welch Allyn Service
Center.

WARNING Use of an uncharacterized monitor can result in overinflation of
neonatal cuffs. The monitor is characterized at the factory. If any change to the
NIBP components occurs, the monitor must be withheld from service until it has
been characterized again.

If the time spent to run these tests is too long, the monitor times out and dumps
pressure.

Note

1. Attach a #1 neonatal cuff and hose to the monitor.

2. Wrap the cuff securely around a solid cylinder of circumference between 1.6 and 1.9

3. Navigate to Service > NIBP > NIBP Test.

Note

This test method uses a higher test pressure than required for compliance to
regulatory standards, because only one of the monitor choices for built-in test
pressures is equal to or greater than the maximum pressure required by
regulatory standards. It also uses a much smaller test volume than required.

Using this much more stringent test method assures not only that the monitor
meets the requirements of all regulatory standards but also verifies that the leak
rate of the monitor is sufficient for the monitor’s neonatal applications.

inches (4.1 and 4.8 cm.).

Four test pressures—0, 80, 150, and 300 mmHg—can be selected. The actual
instantaneous pressure achieved, as displayed in the lower left, can vary
significantly from the selected test pressure.

The variance is greatest for the smallest test volumes, where actual pressure
attained can be 10 to 20 mmHg greater than the nominal value of the test
pressure.

60 Functional verification Welch Allyn Propaq LT Vital Signs Monitor

Note

Note

Wait one minute for the NIBP to initialize before you select a test pressure.

Before you switch from one test pressure to another, wait for the pump to fully
inflate the cuff and stop pumping.

4. Press to start the test at 80 mmHg. The cuff inflates to approximately 95 mmHg.

5. After several seconds, press again to inflate to 150 mmHg.

6. After several seconds more, press again to inflate to 300 mmHg. The cuff inflates
to 300 mmHg and the instantaneous pressure display at the lower left reads +++.

7. Wait until the pressure drops enough for the display to read 299 mmHg.

8. Wait 10 more seconds and then verify that the instantaneous pressure

≥ 291 mmHg.

9. Press to select 0 mmHg and release pressure.

Note

Optionally, you can also test the leak rate at lower pressures, using the following
additional steps.

10. Pump to any pressure.

11. Wait 15 seconds and note the instantaneous pressure reading.

12. Wait another 10 seconds and verify that the instantaneous pressure is within 8
mmHg of the noted pressure.

Accuracy test

1. Remove the neonate cuff from the monitor and replace it with an adult cuff and hose
and a digital pressure meter.

2. Securely wrap the cuff around a solid cylinder of diameter between 3.2 and 4.3 inches
(8.1 and 10.9 cm.).

Monitor NIBP

connector

Adult cuff wrapped

around a cylinder

Pressure meter

3. Press to start the test at 80 mmHg. The cuff inflates to approximately 80 mmHg
and then settles to a lower pressure.

4. Verify that the pressure reading on the monitor is within 3 mmHg of the reading on
the digital pressure meter.

5. Press to start the test at 150 mmHg. The cuff inflates to approximately 150 mmHg
and then settles to a lower pressure.

Service Manual Functional verification 61

6. Verify that the pressure reading on the monitor is within 3 mmHg of the reading on
the digital pressure meter.

7. Press to start the test at 300 mmHg. The cuff inflates to approximately 300 mmHg
and then settles to a lower pressure.

Radio test

Note

8. Verify that the pressure reading on the monitor is within 6 mmHg of the reading on

9. Press to return to 0 mmHg pressure.

10. Disconnect the hose from the monitor.

This test applies only to model 802LTAN, 802LTAS, 802LTRN, and 802LTRS monitors.

1. Locate the monitor within 10 feet (unobstructed) of an Acuity System wireless access

2. Verify that the network connection symbol appears on the monitor.

Note

3. Navigate to Service > Radio > Show Info.

4. Verify:

The monitor might momentarily display +++ (overrange reading) before settling
below 300 mmHg.

the digital pressure meter.

point.

If the connection symbol does not appear, verify that the network is up and that
the monitor has not been intentionally disconnected from the network.

If the connection symbol still does not appear, refer to “Radio” on page 12.

Model 802LTRN, 802LTRS

Model 802LTAN, 802LTAS

Safety test (Hi-Pot)

The monitor contains no isolation barriers.

The cradle contains two 4KV isolation barriers—one between the 17-pin connector on the
monitor and the dc power input connector on the cradle, and one between the 17-pin
connector on the monitor and the USB connector on the cradle. These barriers are fully
tested, at the factory, at 4KV rms at 60 Hz.

The power adapter also contains a 4KV isolation barrier.

Since each successive exposure to high voltage contributes to the degradation of an
isolation barrier, and since no direct mains connection to the cradle exists, the following
tests use a hi-pot voltage of 1.5KV as a reasonable compromise.

Optionally, this hi-pot test can also be done on the power adapter.

Electrical leakage tests for source and sink can also be done on the power adapter or on
the cradle as follows:

RSSI < 41 @ 10 feet

RSSI < 61 @ 10 feet

62 Functional verification Welch Allyn Propaq LT Vital Signs Monitor

1. Tie the ECG inputs of a leakage tester to either (a) the negative pin of the dc output
connector of the power adapter or (b) pin 7 or pin 11 of the 17-pin connector on the
cradle.

2. Tie the mains connector of the leakage tester to the ac cord of the power adapter or
to the negative pin of the dc input connector of the cradle or to the metal shroud of
the USB connector of the cradle.

Note, however, that with all insulation systems in place, the leakage current of a product’s
insulation barrier is determined almost entirely by the capacitance inherent in that barrier,
and is thus fixed by materials and spacing within the product. A hi-pot test is more
effective than a leakage test for verifying an isolation barrier.

Note

Check with your local regulatory authority to see whether hi-pot testing has
special requirements to meet local laws and regulations.

1. Set up the hi-pot tester as follows:

Note

For set-up information, refer to the tester manufacturer’s instructions for use.

Voltage 1,500 VAC Ramp Down 0

Max Limit 2.50 mA Arc Sense 0

Min Limit 0.003 mA Frequency Set to local (50 or 60 Hz)

Ramp Up 5.0 S Continuity Off

Dwell 5.0 S Connect Off

Delay 0

2. Connect the retractable return probe to the RETURN connector of the hi-pot tester.

3. Connect the high voltage test probe to the HIGH VOLTAGE (HV) connector of the hi­pot tester and, as required, to the remote trigger jack.

4. Extend the probe tip from the retractable return probe and touch it to either of the
negative sockets of the DC input connector on the side of the cradle.

(-)

(+)

5. Extend the high voltage test probe tip and touch it to pin 7 or pin 11 of the P1
Interconnect connector inside the cradle bay.

Caution Do not bend the connector pins.

Service Manual Functional verification 63

11 7

6. Holding both probes in contact with the specified pins, trigger the hi-pot test.

7. Hold the test probes in place until the test is completed. Verify that PA SS appears in
the tester display.

8. For cradles equipped with a USB port:

a. Move the return probe to the metal shell of the USB connector on the cradle.

b. Keep the high voltage probe on either pin 7 or pin 11 of the interconnect

connector.

c. With both test probes in contact, trigger the hi-pot test.

d. Hold the test probes in place until the test is completed. Verify that PAS S appears

in the tester display.

Battery run time (optional procedure)

Charge the monitor in a cradle until the status indicator on the cradle goes off.

A new, fully charged battery pack is specified to operate the monitor, given the conditions
listed below, for 8 hours under a heavy load or 24 hours under a light load:

Standalone Acuity-connected

Continuous monitoring Continuous monitoring

Back light Off and display set to shortest time-out
period

Display on for no more than 5 minutes per hour plus a
period at the end of each NIBP measurement and a
period for ‘Low Battery’ equipment alerts

‘Low Battery’ equipment alerts acknowledged within
5 minutes

Back light Off and display set to shortest time-out
period

Display on for no more than 5 minutes per hour plus
a period at the end of each NIBP measurement and
a period for ‘Low Battery’ equipment alerts

‘Low Battery’ equipment alerts acknowledged
within 5 minutes

Monitor at 22°C ± 2°C Monitor at 22°C ± 2°C

HR/PR tone set to Low HR/PR tone set to Off

Alarm tone set to Low Alarm tone set to Low

In continuous communication (no
dropouts) with Acuity

64 Functional verification Welch Allyn Propaq LT Vital Signs Monitor

Light load (24 hours)

• ECG with normal sinus rhythm and 60 beats/minute

• Resp at 20 breaths/minute

Heavy load (8 hours)

• ECG with normal sinus rhythm and 60 beats/minute

• Resp at 20 breaths/minute

•SpO

with saturation of 98%, PR of 60 beats/minute

2

• NIBP autointerval of 15 minutes

Service Manual Functional verification 65

Checklist and test results report form

Use a copy of this 3-page form to track your progress through the validation tests.

Test Specification Result Pass NA Fail

Charging/LED operation

4 Input current, cradle < 50 mA

Status, cradle powered,
monitor not inserted

Power indicator: ON

Status indicator: OFF

6 Status, power adapter

connected

8 Status, monitor without

battery

10 Battery voltage, no battery 6.06 V - 6.34 V

11 Charger state, no battery 4

12 Status, battery discharged (red)

14 Battery voltage, pump running 8.25 V- 8.55 V

17 Status, monitor in cradle,

running

19 Charge current, battery

partially discharged

Charger state, battery
partially discharged

20 Status, battery charging (green)

22 Charge current, pump running 150 mA - 220 mA

25 Status, battery fully charged (green)

26 Charger state, battery fully

charged

28 Status, cradle transition Status indicator:

Power indicator: ON

Status indicator: OFF

Status indicator: YELLOW

Cradle status indicator:
GREEN

800 mA - 1100 mA

2

6

green and then OFF

Battery charge time (optional)

2 Charge time < 4 hours

(continued below)

66 Functional verification Welch Allyn Propaq LT Vital Signs Monitor

Test Specification Result Pass NA Fail

System

1 Indicators, start-up Red, yellow, and green LEDs

Low, medium, and loud tones

5 Voltage, power supply Within range

7 Pixels Visual

10 Buttons Visual

13 Charger state 8

ECG

5 Waveform Present

Heart rate 80 bpm ± 3 bpm

6-8 Single lead fail

(repeat for each lead)

Lead Fail message for each
lead

12 Pacer indicator Present

Respiration

5 Waveform (Lead 1) Present

Heart rate 20 bpm ± 2 bpm

8 Waveform (Lead 2) Present

Heart rate 20 bpm ± 2 bpm

- monitor only, Nellcor

SpO

2

4 Pulse rate @ 60 bpm 60 bpm ± 3 bpm

Saturation @ 75% 75% ± 3%

6 Pulse rate @ 200 bpm 200 bpm ± 3 bpm

8 Saturation @ 90% 90% ± 3%

- monitor only, Masimo

SpO

2

2 Pulse rate 61 bpm ± 2%

Saturation 81% ± 2%

- monitor and sensor

SpO

2

Pulse rate @ 60 bpm 60 bpm ± 4 bpm

Saturation @ 94% 94% ± 4%

(continued below)

Service Manual Functional verification 67

Test Specification Result Pass NA Fail

NIBP characterization

5 “Wrong Cuff” alert Message appears

NIBP leak rate

12 Leak rate ≤ 8 mmHg in 10 seconds

NIBP accuracy

4 Accuracy @ 80 mmHg monitor reading =

meter reading ± 3 mmHg

6 Accuracy @ 150 mmHg monitor reading =

meter reading ± 3 mmHg

8 Accuracy @ 300 mmHg monitor reading =

meter reading ± 6 mmHg

Radio

2 Network connection (symbol is present)

4 RSSI @ 10 feet RSSI < 41 (802LTRN/RS)

RSSI < 61 (802LTAN/AS)

Safety (Hi-Pot)

7 Isolation between the monitor

and the cradle power input

8d Isolation between the monitor

and the USB port

Battery run time - new battery (optional)

Isolated

Isolated

Light load 24 hours

Heavy load 8 hours

68 Functional verification Welch Allyn Propaq LT Vital Signs Monitor

69

6

Replacement parts

This list includes field-replaceable service parts only. Product accessories are listed
separately in Welch Allyn Products and Accessories (810-0409-XX), which is available from
Welch Allyn Customer Service.

Order Number Description

Top chassis

020-0647-XX Top Panel Assembly (includes buttons, window, panel overlay)
020-0631-XX Service Kit, Display, Color LCD, QVGA with extender flex
630-0223-XX Gasket, Display (2 each)
600-0506-XX Bracket, Display
660-0227-XX Cable Assembly, LCD Extender Flex
660-0257-XX Speaker Assembly with Cable
600-0554-XX Gasket, Speaker

Bottom chassis

020-0649-XX Connector Panel, ECG/SpO
020-0623-XX Bottom Case Assembly with Power Switch, Connector Panel, and Power Flex)
640-0628-XX Label, Rear Panel
640-0647-XX Label, Icon Descriptions
630-0241-XX Insert, Screw Cover, Bottom Case
630-0243-XX Insert, Rectangular, Bottom Case
660-0218-XX Connector Assembly, Power/USB Flex
680-0074-XX Pump, NIBP, without wires
620-0403-XX Cable Tie (2 per pump)
020-0625-XX Tubing Kit (3 Tubing Sections with fittings and check valve)
020-0624-XX Valve Assembly (Including Pump Wires)
600-0396-XX Check Valve
600-0500-XX Filter
630-0224-XX Cap, Filter
620-0385-XX O-Ring, Filter
620-0397-XX Strap Lugs

620-0383-XX Screw, 6-32 X .437, Captive, Slt, SS
620-0048-XX Screw, 6-32 X .5, PH, Ph, NyLoc, SS
620-0049-XX Screw, 6-32 X 1, PH, Ph, NyLoc, SS
620-0149-XX Screw, 2-28 X .250, TF, PH, Ph, ST, Zinc, Plastite
620-0278-XX Screw, 4-40 X .5, PHH, PNH SST, NyLoc Patch
620-0290-XX Screw, 4-40 X .25, PHH, PNH SST with NyLoc Patch
620-0408-XX Screw, 4-24 X .38, Flt, PHH, Type BT
630-0260-XX Cap, Plastic, Insert/Guide Pin
620-0418-XX Washer, Flat, .215” O.D., .115” I.D., .020” Thick, NPR
620-0217-XX Kepnut, 4-40, Steel, Zinc-Plated
650-0021-XX Loctite, S/LH, No. 425 Thread Locker

/NIBP

2

Fasteners, monitor

70 Replacement parts Welch Allyn Propaq LT Vital Signs Monitor

Charging cradle

020-0635-XX Interconnect PCB
020-0638-XX Power Board Assembly, with Power and Interconnect Cables
020-0650-XX Panel Assembly, I/O, Cradle
600-0544-XX Gasket, Adhesive, I/O Panel
503-0058-XX Fuse, 3A, Slo-Blo, 2AG
020-0637-XX Housing, Upper Cradle
630-0251-XX Latch, Cradle
630-0252-XX Bracket, Latch, Cradle
630-0253-XX Button, Latch, Cradle
020-0652-XX Housing, Lower Cradle Assembly with USB
020-0651-XX Housing, Lower Cradle Assembly without USB
640-0637-XX Label, Cradle
630-0259-XX Plug, USB, Cradle
600-0526-XX Foot, Cradle (4 per)
620-0406-XX Spring, Latch, Cradle (2 per)
600-0552-XX Foil, Latch, Cradle

Fasteners, cradle

620-0188-XX Screw, Plastite, 4-20 X .375, 60-1, Pan Head, Philips
620-0415-XX Screw, #6-32 X .375, PNH, PHH, SST, PTH
620-0414-XX Washer, .281” O.D., .175” I.D., .031” Thick, Nylon
620-0423-XX Screw, M4 X 4, PRCN Shoulder, AW, SST (2.5 mm Hex Drive)
620-0424-XX Screw, M4 X 5 mm, PNH, PHH, SST
620-0149-XX Screw, 2-28 X .250, TF, PH, PH, ST,Zinc, Plastite
620-0413-XX Washer, .187” O.D., .125” I.D., .031 Thick, Nylon
020-0636-XX Fastener Assortment, Monitor/Cradle

71

A

35-ml test volume

Refer to the illustration below:

1. Move the syringe plunger to the 35-ml line.

2. Drill a small hole (for example, 9/64”) through the syringe and the plunger shaft, at a
location between the plunger and the top of the syringe.

3. Insert a rod or bolt (for example, a 6-32 screw) through the hole so that the plunger
cannot move, creating a constant volume in the syringe of 35 ml ± 2 ml.

4. Secure the rod or bolt so that it cannot fall out of the hole.

-- 60

--

-- 50

--

-- 40

--

-- 30

--

-- 20

--

-- 10

--

ml

72 35-ml test volume Welch Allyn Propaq LT Vital Signs Monitor

Index

73

A

accessories, 1
adhesive gasket

, 47

air filter

replacing

, 28

antenna

correct position of

, 36

not user-serviceable
assembly procedures
autoclave

, 1

, 23

B

battery

end of life

operating states

operation

, 27

, 14

, 16

procedure, partial discharge

removing

, 27

storage recommendations

troubleshooting

, 14

C

cable routing, 41, 49
case

disassembly
caution, term defined
characterize NIBP
charger

operating states

troubleshooting
chassis

disassembly

disassembly, top piece
connector

locations
connectors

overview
controls, monitor
cradle

service chart

, 29

, 2

, 19

, 15

, 15

, 29

, 26

, 25

, 6

, 18

, 3

, 32

, 16

, 54

D

disassembly procedures, 23
display

protecting
removing

, 32

, 32

E

ECG cable, 36
ECG flex cable

, 36

electrostatic discharge, see ESD
equipment required

functional verification

ESD

, 2

, 53

F

field-replaceable unit, 3
functional verification

battery run time
checklist and report form
cradle

, 54

ECG

, 56

equipment required
NIBP

, 59

overview
radio

, 61

respiration
safety

, 61

system tests

, 63

, 65

, 53

, 53

, 57

, 56

G

gasket

adhesive
large blue

, 47

, 31

H

Hi-Pot, 61

74 Index Welch Allyn Propaq LT Vital Signs Monitor

L

LCD bias, 21

M

main board

not user-serviceable

removing
menu, service
menus, service

, 34

, 6

, 19

, 3

monitor

service chart
monitor controls

, 17

, 6

N

NIBP

characterization
NIBP tubing
NIBP tubing removal
nylon washers

, 19

, 37

, 35

, 46

P

photosensor (obsolete), 51, 52
power switch

, 38

pump

removing

wiring

, 40

, 41

R

service menus
shipping

, 19

, 4

speaker

disassembly
removal

SpO

cable, 37

2

, 30

, 33

T

technical support, 3
troubleshooting
tubing

, 37

removal

, 9

, 35

V

verification

see functional verification

W

warning, term defined, 2
warranty

, 1

washers

nylon

, 46

Z

zero insertion force

see ZIF

ZIF connectors

using

, 25

radio

not user-serviceable
radio status

checking

, 21

reassembly procedures
returning products
RMA

, 4

routing

, 41, 49

, 4

S

safety, 1

general information
screws

chart

, 24

service

intervals

warranty and non-warranty
service menu

characterize NIBP

setting the LCD bias

, 5

, 6

, 19

, 3

, 23

, 1

, 5

, 21