Welch Allyn 802LTAN, 802LTAS, 802LT0S, 802LT0N, 802LTRS Service Manual
...
®
Propaq
LT
Vital Signs Monitor
Service Manual
Software version 1.5X or later
ii Welch Allyn Propaq LT Vital Signs Monitor
© 2011 Welch Allyn. All rights are reserved. To support the intended use of the product described in this publication, the purchaser of
the product is permitted to copy this publication, for internal distribution only, from the media provided by Welch Allyn. No other use,
reproduction, or distribution of this publication, or any part of it, is permitted without written permission from Welch Allyn
Welch Allyn assumes no responsibility for any injury to anyone, or for any illegal or improper use of the product, that may result from
failure to use this product in accordance with the instructions, 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 SpO2-equipped monitor does not convey any express or implied license to use the 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 + 1 315 685 4560
800 535 6663
Canada 800 561 8797 China + 86 216 327 9631
European Call Center + 35 3 46 906 7790 France + 33 1 60 09 33 66
Germany + 49 7477 92 71 86 Japan + 81 3 3219 0071
Latin America + 1 305 669 9003 Netherlands + 31 15 750 5000
Singapore + 65 6419 8100 South Africa + 27 11 777 7555
United Kingdom + 44 20 7365 6780 Sweden + 46 8 58 53 65 51
Australia + 61 2 9638 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
DIR 810-2713-01 A
Welch Allyn, Inc.
8500 SW Creekside Place
Beaverton, OR 97008-7107 USA
Regulatory Affairs Representative
Welch Allyn Limited
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.
WARNING Use only accessories approved by Welch Allyn. Visit
www.welchallyn.com. The use of any other accessories can result in inaccurate
patient data, can damage the equipment, and can void your product warranty.
WARNING Always use accessories according to the standards of your facility
and according to the manufacturer's directions.
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.
2 Safety summary Welch Allyn Propaq LT Vital Signs Monitor
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 (810-2713-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.
Electrostatic discharge (ESD)
ATTENTION
CAUTION
SENSITIVE ELECTRONIC DEVICES
DO NOT SHIP OR STORE NEAR STRONG
ELECTROSTATIC, ELECTROMAGNETIC,
MAGNETIC OR RADIOACTIVE FIELDS.
OBSERVE PRECAUTIONS
FOR HANDLING
ELECTROSTATIC
SENSITIVE DEVICES
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.
• 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.
Service Manual Safety summary 3
Symbols
WARNING Indicates conditions that could lead to illness, injury, or death.
Caution In this manual, indicates conditions that could damage equipment or other property.
4 Safety summary Welch Allyn Propaq LT Vital Signs Monitor
5
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 71.
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
6 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
When requesting an RMA, please have the following information available:
Note
Before shipping the monitor, please observe these packing guidelines:
Welch Allyn does not accept returned products without an RMA.
• 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.
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.
• 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.
Service Manual Overview 7
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
802LT0S ECG, NIBP, Masimo SpO
802LTRS ECG, NIBP, Masimo SpO
802LTAS ECG, NIBP, Masimo SpO
2
2
2
Communication Enabled
2
2
2
Recommended service intervals
Interval or condition Action recommended Procedure
Every6-24months
(per hospital protocols)
Every 36 months Replace the air filter “Replacing the air filter” on page 30
Every 36 months Replace the battery “Removing the lithium ion battery
The battery does not hold a charge Check battery capacity
Verify functionality “Functional verification” on page 55
Replace the battery
Top-Level
Assembly
No 007-0160-XX KA
Yes 802.11 FHSS 007-0161-XX KA
Yes 802.11a 007-0384-XX KA
No 007-0268-XX KA
Yes 802.11 FHSS 007-0269-XX KA
Yes 802.11a 007-0383-XX KA
assembly” on page 29
“Functional verification” on page 55
“Removing the lithium ion battery
assembly” on page 29
Serial #
Prefix
The monitor has been dropped or
otherwise damaged
The monitor is not functioning
properly
The monitor does not pass the
functional verification
Verify functionality “Functional verification” on page 55
Verify functionality “Functional verification” on page 55
Troubleshoot and repair, and then
verify functionality
Return the monitor to an authorized
Welch Allyn service center
“Troubleshooting and repair” on page 11
“Disassembly and reassembly” on page 25
“Functional verification” on page 55
“Returning products” on page 6
8 Overview Welch Allyn Propaq LT Vital Signs Monitor
Service options
Warranty service
All repairs on products under warranty must be performed or approved by Welch Allyn.
Refer all warranty service to Welch Allyn Factory Service or another authorized Welch
Allyn Service Center. Obtain an RMA number for all returns to Welch Allyn Factory
Service. (See “Returning products” on page 6.)
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.
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.
Service Manual Overview 9
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
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
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
%
3. Scroll right ( ) to highlight Service, and press . The service menu appears, with
NIBP and Show Info highlighted.
10 Overview Welch Allyn Propaq LT Vital Signs Monitor
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
11
3
Troubleshooting and repair
Troubleshooting chart .............................................11
Battery use and care ..............................................18
Service chart ....................................................19
Service menus for repair and network troubleshooting....................21
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 19 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 6.)
“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 6.)
Service Center for service. (See “Returning
products” on page 6.)
Install a new battery. “Removing the lithium
ion battery assembly” on page 29.
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 29.
cradle and verify that the symptoms persist. If
yes, then replace the cradle power board.
“Disassembling the cradle” on page 47.
12 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.
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.
Button board not connected. Connect the button board to the main board.
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
“Separating the top and bottom chassis
halves” on page 31.
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 47.
the power switch). “Removing the main board
from the bottom chassis assembly” on
page 36.
Replace the cradle power board.
“Disassembling the cradle” on page 47.
Service Center for service. (See “Returning
products” on page 6.)
Replace the fuse. “Replacing the fuse” on
page 47.
battery assembly” on page 29.
Radio cannot link up to the
Acuity Central Station.
Yellow indicator on the cradle. Monitor current draw is too high.
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.
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
See “Radio” on page 14.
Service the monitor or the cradle.
Install the monitor batterypack. “Removing the
lithium ion battery assembly” on page 29.
Return the battery pack to within the specified
temperature range (0
Replace the battery pack. “Removing the
lithium ion battery assembly” on page 29.
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 29.
Replace the battery pack. “Removing the
lithium ion battery assembly” on page 29.
power board, and the interconnect board.
“Removing the power/USB flex connector from
the bottom chassis” on page 46.
C-40C).
Missing or erroneous LCD characters Faulty LCD. Replace the LCD. “Disassembling the top
chassis” on page 34.
Service Manual Troubleshooting and repair 13
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 34.
Voltages displayed on the service
menu are out of range.
Repeated occurrence of “SpO
No sensor detected.“
2
Main board fault. Send the monitor to an authorized Welch Allyn
Service Center for service. (See page ii.)
Fault.
The internal SpO2connector is
loose.
Secure the internal SpO2connector. “Removing
the main board from the bottom chassis
assembly” on page 36.
Faulty SpO
connector panel. Replace the connector panel. “Removing the
2
patient connector panel from the bottom
chassis” on page 45.
The NIBP air leak exceeds the
specification.
Worn O-ring in the NIBP hose
connector.
Deficient NIBP check valve,
bleed valve, or overpressure
Try a different NIBP hose or replace the O-ring.
Replace the valve. “Removing the NIBP
assembly from the main board” on page 41.
valve.
NIBP tubing not properly
connected.
Connect the internal tubing. “Removing the
NIBP assembly from the main board” on
page 41.
“Equipment Alert.
NIBP Fault.
Air leak. Check hose.“
Repeated occurrence of “NIBP Fault.
Air leak. Check hose.“
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 41.
Internal tubing is disconnected. Connect the internal tubing. “Removing the
NIBP assembly from the main board” on
page 41.
“Equipment Alert.
NIBP Fault.
Kinked or neonate hose.“
“Equipment Alert.
NIBP Fault.
Overpressure condition.“
“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.
Internal tubing is damaged. Replace the damaged section of internal
tubing. “Removing the NIBP assembly from the
main board” on page 41.
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 41.
A transient pressure pulse was
Restart the monitor.
introduced into the cuff via
sudden and excessive patient
motion.
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 6.)
14 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 ( ).
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.
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.
Radio Monitoring service screen
persistently displays “Searching
for access point” and “Radio
sleeping”; monitor displays ( ).
(802LTAN/802LTAS)
Display alternates between
“search” and “radio sleeping”.
The monitor Netname does not
match the Acuity network name.
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 15
Symptom Possible Cause Possible Corrective Action
Radio Monitoring service screen
persistently displays “Searching
for access point”; monitor
displays ( ). (802LTAN/802LTAS)
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.”
Frequent communication faults
with no apparent cause. On the
Radio Monitoring service screen,
TX/RX errors (PERCENT) is > 5%.
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.
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.
Faulty antenna or poor antenna
connection.
Send the monitor to an authorized Welch Allyn
Service Center for service. (See “Returning
products” on page 6.)
Faulty radio connection. Send the monitor to an authorized Welch Allyn
Service Center for service. (See “Returning
products” on page 6.)
Poor radio coverage. Verify that the network has a sufficient density
of access points on the current network.
16 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
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 chargeremaining,
undocked.
7 5 minutes of chargeremaining,
docked.
8 Battery is exhausted,
undocked.
9 Battery is exhausted, docked. Normal operating state.
10 Battery voltage is too low for
recharging, docked.
persist.
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 29.
Replace the battery pack (“Removing the
lithium ion battery assembly” on page 29)
or the cradle power board (“Disassembling
the cradle” on page 47).
lithium ion battery assembly” on page 29.
Service Manual Troubleshooting and repair 17
Charger states and service
State Description Charger
0 Charger state
unknown.
1 Monitor docked,
No-power fault.
2 Monitor docked,
charging.
Status
LED
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
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.
n/a
If the power adapter is not
connected, connect it.
Replace the fuse. “Replacing the
fuse” on page 47.
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 47.
3 Monitor docked,
temperature
fault.
4 Monitor docked,
battery voltage
too low for
charging.
5 Monitor docked,
timeout fault.
6 Monitor docked,
charging
complete.
7 Monitor docked,
overcharge fault.
8 Monitor not
docked.
Yellow Green Fault—battery pack temperatureis
out of range high or low.
Yellow Green Fault—battery pack can no longer
be charged.
Yellow Green Fault—Battery pack failed to
charge within the specified time.
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
Bring the battery pack
temperature into specified range
(0° C - 40° C).
Replace the battery pack.
“Removing the lithium ion battery
assembly” on page 29.
Attempt again to charge by
removing the monitor from the
cradle and reinserting the monitor
in the cradle.
Replace the battery pack.
“Removing the lithium ion battery
assembly” on page 29.
Replace the battery pack
(“Removing the lithium ion battery
assembly” on page 29).
Replace the power board in the
cradle ( “Disassembling the
cradle” on page 47).
18 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 19
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 30.
Replace the battery pack. “Removing the lithium ion battery assembly” on
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)
page 29.
1. “Removing the patient connector panel from the
bottom chassis” on page 45.
2. “Functional verification” on page 55.
1. “Disassembling the top chassis” on page 34.
2. “Set LCD bias” on page 23
3. “Functional verification” on page 55.
1. “Disassembling the top chassis” on page 34.
2. “Functional verification” on page 55.
1. “Removing the main board from the bottom
chassis assembly” on page 36.
2. “Functional verification” on page 55.
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 41.
2. “Characterize NIBP” on page 21.
3. “Functional verification” on page 55.
(See “Returning products” on page 6.)
(See “Returning products” on page 6.)
20 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 47.
1. “Disassembling the cradle” on page 47.
2. “Functional verification” on page 55.
1. “Disassembling the cradle” on page 47
2. “Functional verification” on page 55.
1. “Disassembling the cradle” on page 47
2. “Functional verification” on page 55.
1. “Disassembling the cradle” on page 47
2. “Functional verification” on page 55.
1. “Disassembling the cradle” on page 47
2. “Functional verification” on page 55.
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