Welch Allyn VITAL SIGNS MONITOR Service manual

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Page 1

Service Manual

Patient Monitor

Service Manual

Welch Allyn

Vital Signs Monitor

Medical Division

4341 State Street Road, P.O. Box 220

Skaneateles Falls, NY 13153-0220

PN 95P360E

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Welch Allyn Vital Signs Monitor Service Manual

SECTION 1:

General Information

Revision 4.0

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Page 5

SERVICE MANUAL

Welch Allyn

Vital Signs Monitor

4341 State Street Road Service Manual pn95P360E Skaneateles Falls, NY 13153-0220 Rev. 4, 9/98

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

*Note: All drawings enclosed are for reference only. Consult the system or the factory for all current drawings.

Revision History

Revision Sections Date Author Description

1.00 All 4/18/96 JDB/RJS Introduction of manual.

2.00 All 7/9/96 JDB Revision made due to problems found in training and changes to the repair software.

3.00 All 5/28/97 JDB Revisions made for support of Nellcor SpO module.

4.00 All 10/1/98 JDB Added schematics, board layouts and bill of materials, miscellaneous corrections.

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

SECTION 1: General Information Sub-Section: Page:

To Service Personnel................................................ 1.1 1

Limited Warranty/Warranty Assistance ..................... 1.2 3-4

Basic System Description.......................................... 1.3 5

Basic System Operation Index .................................. 1.4 7

Basic System Operation............................................ 1.4 8-14

Block Diagram of Unit Operation............................... 1.5 16-17

Specifications ............................................................ 1.6 19-23

Serial numbering system defined.............................. 1.7 25

Firmware Identification .............................................. 1.8 27

SECTION 2: Service Set Up

Service Manual Intent & Scope ................................. 2.1 1

Test Equipment Bench Layout .................................. Fig 2.2.1 3-4

Required Tools/Equipment List ................................. 2.2.2 5

Replacement Parts List ............................................. 2.3 7-9

Maintenance/Service Support ................................... 2.4 11

SECTION 3: Problem Diagnosis

Overview ................................................................... 3.1 1

Diagnostic Process/Returned units ........................... 3.2 3-5

When and how to calibrate........................................ 3.3 7-8

Loading Unit Software............................................... 3.4 9

Welch Allyn Monitor Self Diagnostic Fault Codes ..... 3.5 11-13

“Complaint/Cause/Corrective Action” ........................ 3.6 15-19

SECTION 4: Major Component Removal/Replacement

(IN ORDER OF REMOVAL ACCESS)

Front Housing............................................................ 4.1 1-2

Main Fuse F1 on Main PCB ...................................... 4.2 3-4

Main Printed Circuit Board (PCB).............................. 4.3 5-6

DC TO DC Converter (SpO

Pressure Transducer on Main PCB........................... 4.5 9-10

Display PCB .............................................................. 4.6 11-12

Key Pad (front housing)............................................. 4.7 13-14

Temperature PCB ..................................................... 4.8 15-16

Specific Oxygen Board (Nonin) ................................. 4.9 17-19

Specific Oxygen Board (Nellcor) ............................... 4.10 21-22

Pump ......................................................................... 4.11 23-24

Pressure Switch MPL-503......................................... 4.12 25-26

Valve (Pneutronics) ................................................... 4.13 27-28

Printer/Printer PCB/keypad ....................................... 4.14 29-30

Battery ....................................................................... 4.15 31-32

units) ............................ 4.4 7-8

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

SECTION 5: Test Procedures Sub-Section: Page:

Calibration test.......................................................... 5.1 1-2

Current tests............................................................. 5.2 3

Noise test.................................................................. 5.3 5

Button Test ............................................................... 5.4 7

Print quality............................................................... 5.5 9

Pneumatic test.......................................................... 5.6 11-12

Hardware Fail-safe Tests ......................................... 5.7 13

option testing................................................... 5.8 15

SpO

Temperature option testing....................................... 5.9 17

Check List for CBPM Service Work.......................... 5.10 19-20

SECTION 6: Drawings, Schematics, Board Layouts, Bill of Materials

SECTION 7: Repair Test Specifications

Specifications ........................................................... 7.1 1-5

CAUTION: PRIOR TO DOING REPAIR WORK, USE GROUNDING MAT AND ANTI-ST A TIC WRIST STRAP T O MINIMIZE RISK OF DAMA GE T O SENSITIVE ELECTRONIC COMPONENTS .

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

1.1 To Service Personnel:

Read and understand the Welch Allyn Vital Signs Monitor Operator Manual and this Service Manual. The information contained in both of these publications is subject to change without notice and should not be construed as a commitment by Welch Allyn, Inc.

Welch Allyn assumes no responsibility for any errors that may appear in this manual. If the product and/or its operation varies significantly from any description herein, please contact the WELCH ALLYN TECHNICAL SERVICE DEPARTMENT: 1-800-450-9275 (828) 684-4895 Fax (828)687-9323

Welch Allyn, Inc. 95 Old Shoals Road Arden, North Carolina 28704

This product has been designed to provide a high degree of safety and reliability. However, we can not guarantee against: deterioration of components due to aging, normal wear, tampering, and abuse.

Section 1: General Information

All service and repairs must be performed by authorized Welch Allyn personnel or agents, using approved Welch Allyn replacement parts and approved process materials. Failure to so will invalidate the product warranty. Please refer to the product warranty for specific coverage.

Welch Allyn, Inc. 95 Old Shoals Road Arden, North Carolina 28704 USA 1 800 450-9275

CAUTION WHEN USING ADHESIVES:

ALWAYS WEAR SAFETY GLASSES AND PROVIDE ADEQUATE VENTILATION WHEN USING ADHESIVES, THEIR ACCELERATORS AND RTV SEALANTS. READ, UNDERSTAND, AND COMPLY WITH SAFETY RECOMMENDATIONS IN THE MATERIAL SAFETY DATA SHEET MSDS) FOR THESE MATERIALS. SUPER-GLUES (CA ADHESIVES) CAN CAUSE CORNEAL DAMAGE IF ACCIDENTLY SQUIRTED IN THE EYES, AND CAN SPONTANEOUSLY COMBUST IF SPILLAGE IS WIPED UP WITH CLOTH OR PAPER TISSUES. READ THE WARNINGS AND CAUTIONS PRINTED ON THE BOTTLES OR TUBES OF THESE GLUES!

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

1.2 Limited Warranty

Welch Allyn warrants the Welch Allyn Vital Signs Monitor, when new, to be free of defects in material and workmanship and to perform in accordance with manufacturer’s specifications for a period of two years from the date of purchase from Welch Allyn or its authorized distributors or agents. Welch Allyn will either repair or replace any components found to be defective or at variance from manufacturer’s specifications within this time at no cost to the customer. It shall be the purchaser’s responsibility to return the instrument to Welch Allyn or an authorized distributor, agent or service representative. This warranty does not include breakage or failure due to tampering, misuse, neglect, accidents, modification or shipping. This warranty is also void if the instrument is not used in accordance with manufacturer’s recommendations or if repaired by other than Welch Allyn or an authorized agent. Purchase date determines warranty requirements. No other express warranty is given.

Section 1: General Information

To receive service assistance or to ask questions regarding this warranty, please call or write:

Welch Allyn Technical Services Dept. 95 Old Shoals Road Arden, North Carolina 28704 USA 1 (800) 450-9275 or (828) 684-4895 Fax: (828) 687-9323

Service Policy

All repairs on products under warranty must be performed or approved by a Welch Allyn Service Center. should be repaired by qualified electronics personnel or a Welch Allyn Service Center.

Unauthorized repairs will void the warranty

. Products out of warranty

Technical Assistance

If you have an equipment problem that you cannot resolve, call the Welch Allyn Service Center nearest you for assistance. Technical service support is available to you by telephone on normal business days, from 8:30AM until 4:30PM Eastern Standard Time at the phone numbers listed on the next page.

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Section 1: General Information

Before returning a product for repair you must obtain authorization from Welch Allyn. An RGA (Return Goods Authorization) number will be given to you by our service personnel. Be sure to note this number on the outside of your shipping box. Returns without an RGA number will not be accepted for delivery.

Welch Allyn Vital Signs Monitor Service Manual

Revision

Welch Allyn Service Centers

For Service or Repair

4.0

USA Customers Welch Allyn, Inc.

Technical Service Centers 95 Old Shoals Arden, NC 28704-9739 USA Phone: 828-684-4895 Fax: 828-687-9323

Welch Allyn

Technical Service Center Zollerstrasse 2-4 Road D-7241 7 Jungingen GERMANY Phone: [49]-7477-9271-73 Fax: [49]-7477-9271-93

Welch Allyn Ltd.

21-09 Golden Beach Road Singapore 199589 REPUBLIC OF SINGAPORE Phone: Fax: [65]-291-5780

[65]-29

Road

GmbH

Mile to 6001

l-0882

CANADA Customers Welch Allyn Canada Limited

Technical Service Centers

160 Matheson Blvd., East Mississauga, Ontario Ph: 905-890-0004 or 1 800-561-8797 Fax: 905-890-0008

INTERNATIONAL Customers

Welch Allyn Australia Pty. Ltd.

Technical Service Center Ground Floor, 18-20 Lane Cove AUSTRALIA Phone: [61]-29-4183-155 Fax: [61]-29-4183-650

NSW 2066

L4Z1

Orian

V4 CANADA

Road

MDI International

Technical Service Centers 7324 SW 48th Street Miami, FL 33155 USA Phone: 305-669-9591 Fax: 305-669-l 971

LATIN AMERICA Customers

Welch Allyn

\N!!

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

Section 1: General Information

1.3 Basic System Description

Introduction

The Welch Allyn Vital Signs Monitor is designed to non-invasively and automatically measure systolic and diastolic pressure, pulse rate, temperature and oxygen saturation (SpO sure, pulse, temperature and read displays, and may be printed via an integrated thermal printer, as desired.

The rechargeable battery and wide variety of mounting accessories make the Clinical Monitor convenient for many locations. The operator may choose any combination of simultaneous measurement modalities. This flexibility, combined with features such as programmable alarms and automatic BP cycles, makes the Clinical Monitor ideal for a wide variety of patient monitoring needs.

) for adult and pediatric patients. All pres-

SpO2 values are displayed on large, easy-to-

Refer to the Operator Manual PART NUMBER 5200-85 (SPECIFY LANGUAGE) Section 1 for complete information on Indications For Use, Special Features, Supplies and Accessories

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

Section 1: General Information

1.4 Basic System Operation

INDEX

1.5.1 Blood Pressure Operating Modes a. Max/Min Blood Pressure and Pulse Ranges b. Blood Pressure Manual Mode c. Blood Pressure Auto Mode

1.5.2 Temperature Operating Modes a. Max/Min Temperature Ranges b. Temperature Normal Mode c. Temperature Monitor Mode

1.5.3 SpO

Operating Mode

a. Max/Min SpO b. SpO

Monitor Mode

1.5.4 Pulse Rate Feature Max/Min Pulse Rate Ranges

Ranges

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Section 1: General Information

Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

1.4.1 Blood Pressure Operating Modes

When a blood pressure measurement cycle is initiated, the cuff will automatically be inflated to the operator selected pressure level.

The cuff will immediately begin to deflate in a stepped fashion and will determine systolic pressure and diastolic pressure from the pulses sensed by the cuff at various pressure levels. This is the oscillometric method of non-invasive blood pressure monitoring.

Blood pressure measurements may be initiated manually, or automatically at time intervals determined by the user.

At the completion of a measurement cycle the systolic and diastolic pressures are displayed. If the Monitor is in Automatic Mode, the measured values are kept on display until the next BP measurement is initiated. When not in Automatic Mode, the measured values are displayed for two minutes, after which time the display screen is blanked. The most recent BP measurement may be recalled by pressing the REVIEW button.

When in Automatic Mode, if the unit is unable to determine the systolic or diastolic value, the measurement will be automatically repeated once.

1.4.1.a. Max/Min Blood Pressure Ranges

The maximum and minimum ranges of blood pressure are detailed below:

Measurement Maximum Minimum

Systolic Pressure 250 mmHg 60 mmHg Diastolic Pressure 160 mmHg 30 mmHg

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Welch Allyn Vital Signs Monitor Service Manual

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Section 1: General Information

1.4.1.b. Blood Pressure Manual Mode

In the Manual Mode, a single blood pressure determination is made only when the START button is pushed. The manual mode is the default mode of operation for blood pressure determinations.

A measurement cycle may be canceled at any time by pressing the CANCEL button. This action immediately initiates a rapid cuff deflation.

The blood pressure measurement data will appear on the display immediately following the measurement. The display will blank after two minutes. If the display is blanked, pressing the REVIEW button on the front panel will recall the measurement. Up to 99 prior measurements are available for review or printing.

In Blood Pressure Manual Mode, the following alarm limits may be activated; SYSTOLIC HIGH LIMIT, SYSTOLIC LOW LIMIT, DIASTOLIC HIGH LIMIT, DIASTOLIC LOW LIMIT, PULSE RATE HIGH LIMIT and PULSE RATE LOW LIMIT. Blood pressure determinations which activate alarms are indicated by flashing displays and a repetitive audible tone. If an alarm limit is violated, subsequent blood pressure determinations may be made only after the alarm condition is reset by pressing any button on the Monitor’s display.

1.4.1.c. Blood Pressure Automatic Mode

The Automatic Blood Pressure Mode is entered by pressing the AUTO button. Pressing the AUTO button displays a choice of 10 cycle interval times as follows: “st” (STAT mode) 3 min, 4 min, 5 min, 10 min, 15 min, 30 min, 45 min, 60 min and 90 min. These choices represent the time interval from the beginning of one cycle to the beginning of the next automatic cycle. STAT mode allows the monitor to take continuous blood pressure measurements for 15 minutes. In addition, the operator may choose to disable the Auto Mode by choosing “—” (two dashes).

A measurement cycle may be canceled at any time by pressing the CANCEL button. This action immediately initiates a rapid cuff deflation.

The blood pressure measurement data will appear on the display immediately following the measurement and will remain displayed until the next measurement cycle is initiated.

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Section 1: General Information

Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

1.4.1.c. Blood Pressure Automatic Mode continued

In Blood Pressure Auto Mode, the following alarm limits may be activated; SYSTOLIC HIGH LIMIT, SYSTOLIC LOW LIMIT, DIASTOLIC HIGH LIMIT, DIASTOLIC LOW LIMIT, PULSE RATE HIGH LIMIT and PULSE RATE LOW LIMIT. Blood pressure determinations which activate alarms are indicated by flashing displays and a repetitive audible tone. Any alarm limit violation sure determinations. The alarm may be reset by pressing any button on the monitor’s display.

must be reset to continue automatically timed blood pres-

1.4.2. Temperature Operating Modes

Thermistor Thermometry measurements are made with the DIATEK/Welch Allyn SureTemp4TM thermometer. Oral and rectal probes utilize single-use disposable probe covers which limit cross-contamination. Oral or rectal temperatures are taken using ‘Normal’ or ‘Monitor’ operating modes. Auxiliary temperatures may be taken using the oral probe in the monitor operating mode.

In the normal mode the thermometer’s microprocessor “predicts” body temperature in about 4 seconds for oral temperatures and in about 15 seconds for rectal temperatures. The monitor mode displays the patient’s actual temperature after 3 minutes and will continue to display an updated temperature as long as the probe remains in place.

Temperature readings may be displayed in Fahrenheit or Celsius scales.

1.4.2.a. Max/Min T emperature Ranges

Readings Normal Mode Monitor Mode

Temperature Max 108.0F Max 108.0F

Max 42.2C Max 42.2C Min 84.0F Min 84.0F

Min 28.9C Min 28.9C

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Welch Allyn Vital Signs Monitor Service Manual

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Section 1: General Information

1.4.2.b. T emperature Normal Mode

In Normal Mode, the device will measure temperature at discrete intervals and then calculate the rate of change according to a known algorithm. This allows the thermometer to predict the end point that the thermistor would reach if it were left in the mouth until it reached mouth temperature. This predictive an accurate oral temperature reading in approximately 4 seconds.

Normal mode is the default operating mode for temperature determinations.

Operator selectable patient alarm limits are not available in Temperature Normal

Mode. However, temperatures which are outside of the operating range of the

device will be noted on the temperature display.

feature allows the thermometer to arrive at

1.4.2.c. Temperature Monitor Mode

Continuous Monitor Mode operation is normally used for longer term monitoring and when difficult situations prevent accurate temperatures from being taken in the normal mode. The probe must be in contact with tissue for at least three (3) minutes for accurate temperature measurement. Monitor mode temperatures may not be identical to predicted ‘Normal’ temperatures because of ambient temperature influence and other factors. The trend in temperature is the important standard to be observed when in the ‘Monitor’ mode.

Operator selectable patient alarm limits are not available in Temperature Normal

Mode. However, temperatures which are outside of the operating range of the

device will be noted on the temperature display.

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Section 1: General Information

Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

1.4.3 SpO Operating Mode

The Welch Allyn Vital Signs Monitor incorporates either the Nonin® pulse oximetry system

or the Nellcor (% SpO

) by measuring the absorption of red and infrared light passed through the tis-

pulse oximetry system which determines arterial oxyhemoglobin saturation

sues. Changes in absorption caused by pulsation of blood in the vascular bed are used to determine arterial saturation and pulse rate.

Oxygen saturation percent is calculated with each pulse detected, and thus the monitor display is continually updated. The pulse signal bar graph is an indicator of the strength and quality of the detected pulses.

When SpO pulse rate measurement from the SpO

is measured, the patient’s pulse rate is also measured and displayed. A

determination overrides a pulse rate measure-

ment derived from a blood pressure measurement. In SpO2 monitoring mode operator selectable alarm limits for low SpO2 % may be acti-

vated. A condition which violates the SpO

low limit alarm is indicated by a flashing

display and repetitive audible tone. Should a patient alarm condition for ≤ or pulse rate occur, the Monitor will indicate an alarm condition (flashing & beeping) while continuing to monitor and display the patient’s current SpO

%. The alarm will automatically reset when

the patient’s condition returns to within the preset alarm parameters. Should a patient alarm condition for SpO

or pulse rate occur, the operator may invoke

“Silence Mode” by pressing the SILENCE button. This will silence the audible tone (display will continue to flash), while the practitioner attends to the patient and the monitor. Silence mode resets automatically after 30 seconds, or when the patient’s condition returns to within the preset alarm parameters.

Removal of the SpO

sensor from the patient will initiate an alarm. To reset the sensor

alarm, press any button on the monitor’s display. SpO

is generally measured via pulses detected using a finger sensor. However, for

certain situations SpO

may be measured at alternate sites including the earlobe, fore-

head and toes. Special sensors must be employed in these situations.

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

Section 1: General Information

1.4.3.a. Max/Min SpO

Ranges

The SpO2 sensor is designed to detect oxygen saturation as follows.

Maximum Minimum

SpO

1.4.3.b. SpO

Monitor Mode

99% 40%

The SpO2 monitor performs most accurately with the finger clip sensor, which may be used on all fingers except the thumb. The finger clip sensor is recommended for spot checks or short term (<30 minutes) continuous monitoring.

The device determines arterial oxyhemoglobin saturation (SpO

%) by measuring the

absorption of red and infrared light passed through the tissue. Oxygen saturation and pulse rate are displayed on the LED digital display. On each detected pulse, the pulse signal bar graph flashes. The intensity of this signal is a simple visual indicator of waveform signal strength, and can identify situations where the pulsatile nature of the tissue may not be adequate for an accurate SpO

reading. The update interval of the bar graph

should correspond to the patient’s pulse rate. This is an indication of the quality of the SpO2 signal.

1.4.4 Pulse Rate Feature

The Welch Allyn Vital Signs Monitor is capable of determining pulse rate as an adjunct to the blood pressure measurement and the SpO

The pulse rate, in beats per minute, will be determined primarily from the SpO methodology. In the case where SpO

is not available, or is disabled, the pulse rate display

will be driven from data collected as part of the blood pressure measurement method. There are two operator selectable alarm limits for the pulse rate. They are PULSE RATE

HIGH LIMIT and PULSE RATE LOW LIMIT. Pulse rates which activate alarm limits are indicated by a flashing display and a repetitive audible tone.

Should a pulse rate alarm occur when the pulse rate measurement is derived from the blood pressure measurement, no subsequent blood pressure or pulse rate measurements may be made until the alarm is reset. The alarm may be reset by pressing any button on the monitor’s display.

measurement.

measurement

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Section 1: General Information

Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

Should a pulse rate alarm occur when the pulse rate measurement is derived from the SpO

measurement, the monitor will indicate an alarm condition (flashing & beeping)

while continuing to monitor and display the patient’s current SpO

% and pulse rate. The

alarm will automatically reset when the patient’s condition returns to within the preset alarm parameters.

Should a patient alarm condition for pulse rate occur during SpO

monitoring, the opera-

tor may invoke “Silence Mode” by pressing the SILENCE button. This will silence the audible tone (display will continue to flash), while the practitioner attends to the patient and Monitor. Silence mode resets automatically after 30 seconds, or when the patient’s condition returns to within the preset alarm parameters.

1.4.4.a. Max/Min Pulse Rate Ranges

The maximum and minimum pulse rate ranges are as follows:

Maximum Minimum

Pulse Rate 200 bpm 40 bpm

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Section 1: General Information

Welch Allyn Vital Signs Monitor Service Manual

Figure 1.5 Block Diagram of Unit Operation

Revision 4.0

Off

➤

Yes

Reset

Display?

➤

Yes

➤

Yes

➤

Start Taking

Reading

Is Cancel Pressed?

➤➤➤

Is Reading

Finished?

➤

Display Last

Reading

Any button than

review select?

➤➤

Is 10 sec. since last

action?

➤

Is Review

Pressed?

Yes

➤

Display

Next RDG?

➤

Is Power Button

➤

Pressed?

Power Start

Review

➤

Display

Record Setting

Reset

➤

Yes

➤

Silence

➤

Is Alarm

Activated?

➤

Yes

Silence Alarm

for 30 Seconds

Yes

➤

Yes

➤

Is Start

Button Pressed?

➤➤

Post

Ready State

Auto

➤

Display Current

Timer Setting

Any button than

auto select?

Is 10 sec.

since last

action?

Is Auto

Pressed?

Display

Next Setting?

➤

➤➤➤➤

Yes

➤

Yes

➤

Is Cancel

➤

Button Pressed?

Select

➤

Reset

Display

➤

Record Setting

➤

Is Adjust

Pressed?

➤

Is Select Pressed?

Yes

➤

Record Setting

for Displayed

Alarm

➤

Display Next Alarm

@ Current Setting

Yes

➤

Feed

Mode

➤

Display Current

Setting of 1st Alarm

Any button than

Yes

➤

Yes

➤

adjust select?

➤

Is 10 sec. since last

action?

Display

Setting?

P2➤

➤

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Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

Section 1: General Information

Figure 1.5 Block Diagram of Unit Operation

➤

BP module

active, SpO

module inactive

➤

Both BP and SpO

SpO2 module

active, BP

module inactive

➤

Post

➤

Show Versions

Print produces version report

Start closes valve

Cancel opens valve

Auto runs pump while pressed

module active

Review advances to next box

Power returns to “O” at any time

Cancel resets changes

Calibration

➤

Report

➤

Post

Print produces version report

Auto runs pump while pressed

➤

Advance Paper

One line

Review advances to next box

Power returns to “O” at any time

Cancel resets changes

➤

Show Versions

➤

Calibration

Start closes valve

Cancel opens valve

➤

Battery Voltage

Start closes valve

Cancel opens valve

➤

Battery Voltage

Start closes valve

Cancel opens valve

Auto runs pump while pressed

Temp Module Setup

Adjust changes setup

Set Date Adjust changes flashing display Select makes next display flash

➤➤➤➤➤

Set Time

Adjust changes flashing display

Select makes next display flash

SpO2 perfusion signal - systolic display, display perfusion status

➤

Temp Module Setup

Adjust changes setup

Adjust changes flashing display

Select makes next display flash

Adjust changes flashing display

Select makes next display flash

A/D Channel Noise

Select changes A/D channels

➤

RS232/Service Port Test

Start begins cycling

Cancel halts cycling

➤ ➤

Set Date

Set Time

➤➤

Life Test

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Revision 4.0

Section 1: General Information

1.6 Specifications

Index:

1.6.1 Performance Specifications

1.6.2 Technical Specifications a. Mechanical Specifications b. Electrical Specifications c. Environmental Specifications

1.6.3 Printer Specifications

1.6.1 Performance Specifications

The performance specifications of the Clinical Vital Signs Monitor are as follows:

CUFF PRESSURE RANGE

0 mmHg - 300 mmHg

INITIAL CUFF INFLATION

120 mmHg, 140 mmHg, 160 mmHg, 200 mmHg, 240 mmHg or 280 mmHg depending on pressure preset level.

SYSTOLIC DETERMINATION

Maximum: 250 mmHg Minimum: 60 mmHg

DIASTOLIC DETERMINATION

Maximum: 160 mmHg Minimum: 30 mmHg

BLOOD PRESSURE ACCURACY

Blood pressure accuracy meets or exceeds SP10-1992 AAMI standards for non-invasive blood pressure accuracy (AAMI standard: ± 5 mmHg mean error; 8 mmHg standard deviation). Blood pressure accuracy is validated for pressure measurement using the upper arm only.

BLOOD PRESSURE DETERMINATION TIME

20 seconds to 45 seconds typical, 140 seconds maximum.

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Section 1: General Information

Welch Allyn Vital Signs Monitor Service Manual

PULSE RATE DETERMINATION

Maximum: 200 bpm Minimum: 40 bpm

PULSE RATE ACCURACY

SpO

Module Heart Rate ±3.0%

Blood Pressure Algorithm Heart Rate ±5.0%

OVERPRESSURE CUTOFF

295 mmHg to 330 mmHg

TEMPERATURE DETERMINATION

Normal Mode Maximum 108.0F (42.2C)

Minimum 84.0F (28.9C)

Monitor Mode Maximum 108.0F (42.2C)

Minimum 84.0F (28.9C)

Revision 4.0

TEMPERATURE ACCURACY

Temperature accuracy meets ASTM E112-86: “Standard Specification for Electronic Thermometer for Intermittent Determination of Patient Temperature.”

TEMPERATURE DETERMINATION TIME

Normal Mode: ORAL: 4 seconds typical, 15 seconds maximum Monitor Mode: ORAL: 3 minutes.

OXYGEN SATURATION RANGE (SpO2%) 40-99% oxygen saturation

SpO2 ACCURACY

±3% in the range of 70-99% oxygen saturation (1 Standard Deviation)

BATTERY CHARGING

To at least 90% capacity in 12 hours. Unit will operate and charge battery simultaneously when connected to power source.

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Revision 4.0

1.6.2 Technical Specifications:

1.6.2.a Mechanical Specifications

Dimensions

Height 6.5 inches (16.5cm) Length 8.6 inches (21.8cm) Depth 5.0 inches (12.7cm)

Weight

Approximately 6 pounds (2.8Kg)

Color

Oral Temperature Probe - Blue Rectal Temperature Probe - Red

Section 1: General Information

Mounting

Self-supporting on rubber feet IV Pole Mountable Custom Mobile Stand Wall Mountable Attaches to Bed Rail

Portability

-May be hand carried when held by the recessed handle.

-When attached to an IV pole, or mounted on its custom mobile stand, the monitor and accessories can be wheeled from patient to patient.

-When attached to the bed rail may be transported with the patient within the hospital environment.

Operator Instructions/Alarm Interpretation

Comprehensive Operator Manual available. Quick reference operator instructions and alarm interpretation are located on side panel labels.

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Section 1: General Information

Welch Allyn Vital Signs Monitor Service Manual

1.6.2.b Electrical Specifications

Power Requirements

Patient-Rated isolation transformer is connected to AC mains:

Revision 4.0

North American Version International Versions:

Battery

6 v, 4 Ahr / 20 hr Sealed Rechargeable Lead Gel Cell A fully charged battery will support 200 “typical” blood pressure determinations taken at 3

minute intervals (10 hours). Battery is 90-100% charged after 12 hours of charging. The battery automatically charges when the monitor is powered through the AC power transformer. The battery will charge faster when the instrument is not in operation.

120VAC, 60 Hz. 220-240VAC, 50-60Hz.

1.6.2.c Environmental Specifications

Operating Temperature

+10C to +40C +50F to +104F

*Exception: Thermometry module will not operate below 60-F (16-C).

Storage Temperature

-20C to +50C

-4F to +122F

Relative Humidity

15 to 90% (non-condensing)

Operating Altitude

-170 m to + 4877 m

-557 ft. to +16,000 ft.

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1.6.3 Printer T echnical Specifications

Type

Thermal printer, dot matrix

Print speed

46 cps

Paper feed

friction type

Voltage

5 v

Average power when printing

880 mA

Section 1: General Information

Paper width

57 - 58 mm

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Section 1: General Information

1.7 Serial Numbering System Defined

The serial plate for the 52000 Series (Welch Allyn Vital Signs Monitor) is located on the bottom of the unit. The serial number consists of seven digits.

95 00569

1999 0569

The two or four digits on the left The four or five digits on the right are the year of manufacture. are the sequence of build

starting with 00001 annually.

(The example unit was the 569th unit built in 1995 or 1999).

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Section 1: General Information

1.8 Firmware Identification

To confirm these levels, place the unit into the “Configuration” mode. Hold down the

Start

button while the unit is being powered up.

Release the button when the main firmware version appears in the Systolic/Diastolic window. The SpO2 option and Temperature option (if installed) will appear in the Temperature and SpO

Verify the firmware levels by reviewing the Repair Test Specifications document.

displays.

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SECTION 2:

Service Set Up

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Section 2: Service Set Up

2.1 Intent of Manual and Product Scope

This manual provides technical service and recalibration information to technicians authorized to repair and recalibrate Welch Allyn, Inc. products. When used in conjunction with the required test equipment and tools, technicians will be able to diagnose, repair, recalibrate, and test the Clinical Vital Signs Monitor. The manual includes: Calibration Software and Recalibration instructions, fault/cause analysis, step by step disassembly and reassembly procedures, repair, adjustment, and retest procedures.

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Welch Allyn Vital Signs Monitor Service Manual

500 cc

100 cc

250 cc

SETRA

METER

Computer

Minimum Requirements:

386 IBM Compatible

20 MHz or Better

Windows 3.1 or Better

NETECH

METER

T o SPO2

To RS232

NELLCOR/

W elch Allyn

Vital Signs

Block Diagram f or W elch Allyn Vital Signs

Monitor Set-up

Revision 4.0

2.2.1 Test Equipment Bench Layout:

Figure 2.2.1 depicts recommended layout of test equipment and special tools for service and recalibration of the Welch Al

lyn

Vital Signs Monitor.

Section 2: Service Set Up

BENCH layout for recalibrating and testing Welch Allyn Vital Signs Monitor

FIGURE 2.2.1

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Section 2: Service Set Up

Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

Service Notes:

The following commercially available equipment is required for service and calibration of the Welch Allyn Vital Signs Monitor – not available from Welch Allyn.

– IBM compatible 386 20 MHz computer or better. The computer must have Windows

3.1 or higher, DOS 5.1 or higher, a serial port. – 2 Digital Multi-Meters. These meters must have 4 1/2 digit displays for accuracy. – Power Supply. 0-20 Vdc adjustable with 0-3A output. – Oscilloscope. 60 MHz minimum.

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Section 2: Service Set Up

2.2.2 Welch Allyn Vital Signs Service Tools

OPTION II: Partial Service Set

OPTION I: Complete Service Set

DESCRIPTION TOOL # LEAD TIME COMPANY

100cc Test Volume T112819 3 Weeks Welch Allyn ⓦⓦ 250cc Test Volume T112818 3 Weeks Welch Allyn ⓦⓦ 500cc Test Volume T112854 3 Weeks Welch Allyn ⓦⓦ Digital Timer 8456T12 3 Days McMaster-Carr ⓦⓦ NeTech Meter* 200-2000IN 3 Days NeTech – OR – Setra Meter* (0-10 PSIG) 2270-01 6-8 Weeks Setra Systems Pliers T112458 3 Weeks Biltmore Tool ⓦ Bulb And Valve 5088-01 3 Weeks Welch Allyn ⓦⓦ Keypad Engaging Tool T112067 3 Weeks Welch Allyn ⓦ ESD Kit T112469 Stock Cameron & Barkley ⓦ WIRE Cutters T112486 Stock Welch Allyn ⓦ Tweezers T112511 Stock Welch Allyn ⓦ Electronic Swabs 318M2 Stock Welch Allyn ⓦ Pneumatic Tubing (Cut) 97P24 Stock Welch Allyn ⓦⓦ “Y” Fitting 9586TPK4 2 Weeks Festo ⓦⓦ “T” Fitting (3) 9585TPK4 2 Weeks Festo ⓦⓦ Test Cable 130S28 3 Weeks Welch Allyn ⓦⓦ Pneumatic Clamps (3) 21730-001 Stock VWR Scientific ⓦⓦ Torque Screwdriver T112917 Stock Tool And Gauge ⓦ Torque Screwdriver T112918 Stock Tool And Gauge ⓦ Custom Repair Software 130S29E Stock Welch Allyn ⓦⓦ #4 Phillips Bit T112919 Stock Biltmore Tool ⓦ #6 Phillips Bit T112933 Stock Biltmore Tool ⓦ T8 Torx Bit T112464A 3 Weeks Welch Allyn ⓦ 7/16" Wrench T112990 Stock McMaster Carr ⓦ Cable Tie Tool T112845 Stock Newerk ⓦ Nonin Patient Simulator 8000S Stock Nonin ⓦⓦ Nonin Phantom Fingers 9440 Stock Nonin ⓦ Nonin Cable 8500-I Stock Nonin ⓦⓦ Diatek 9600 Calibrator 01800-110 Stock Diatek ⓦ Diatek Cal. Key 06137-000 3 Weeks Diatek ⓦⓦ LG. Adult Cuff/Bag 5200-02 Stock Welch Allyn ⓦⓦ Pneumatic Tubing (Coiled) 5200-07 Stock Welch Allyn ⓦⓦ Service Manual 5200-86E Stock Welch Allyn ⓦⓦ Nellcor Patient Simulator SRC2 Stock Nellcor ⓦⓦ Nellcor Test Cable EC-8 Stock Nellcor ⓦⓦ

££

* Choose one of these meters for calibration. DO NOT ORDER BOTH METERS. Allowing the bio-medical department to use a water bath to check temperature

(measuring against a temperature standard) That standard must be accurate to with +/- 1F. See Section 1.1 for ordering tools.

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Section 2: Service Set Up

2.3 Replacement Parts – Welch Allyn

In addition to individual parts listed below, S

PARE PARTS KITS have been made up for your convenience. This assures that you will have all the mounting materials and other small items needed for a repair. The foam pads mounted on the battery are one such example. Kits will not be broken down. FOR AUTHORIZED REPAIR SITES ONLY.

Welch Allyn Replacement Parts:

PART#: DESCRIPTION:

130S1-E English Front Housing Kit 130S1-S Spanish Front Housing Kit 130S1-F French Front Housing Kit 130S1-G German Front Housing Kit 130S1-I Italian Front Housing Kit 130S2 Front Housing Switch Array 130S3* Main PCB Assembly

Includes: hardware

130S4* Display PCB Assembly

Includes: hardware 130S5* Valve 130S6 Pneumatic Connector

Includes: connector, washer, nut, and grommet 130S7* Pump Assembly

Includes: pump, cable tie mount, 2 cable ties, foam pads, instructions, specifications 130S8E English Rear Housing Kit 130S8F French Rear Housing Kit 130S8G German Rear Housing Kit 130S8I Italian Rear Housing Kit 130S8S Spanish Rear Housing Kit 130S9 Power Jack 130S10 Back Panel

Includes: panel and hardware 130S11 Tubing Assembly

Includes: all tubing, “T” fitting, instructions 130S12 Pressure Switch

Includes: switch and hardware 130S13 Bumpers (2 ea.) 130S14 Battery Access Plate

Includes: plate and hardware 130S15 Wire Harness

Includes: 14 pin MTA connector, 3 pin MTA connector, faston receptacles for the

power supply, power jack, battery, and valve lead wires all assembled 130S16 Temperature Plug 130S17 Printer Assembly

Includes: thermal printer, double faced adhesive foam all assembled

130S18* Printer Housing

Includes: housing, switch array, PCB, hardware, flex strip

130S19 RS232 Cable

Includes: DB9 connector, hardware, 4 pin MTA, lead wires all assembled

Includes: front housing with loose labels. Four different types of labels for the four different configurations i.e.:

BP w/Printer Only, BP w/Printer + Temp,

BP w/Printer + SpO2, BP w/Printer + Temp + SpO

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Section 2: Service Set Up

PART#: DESCRIPTION:

130S20* SpO2 PCB (Nonin)

Includes: PCB with cable attached, DB9 connector and cable (not attached),

and hardware with instructions

130S21 SpO2 Sensor Interconnect (Nonin)

Includes: lead wires and 4 pin MTA connector

130S22* Temperature PCB Assembly

Includes: PCB, hardware, lead wire and connectors

130S23 Temperature Connector

Includes: connector, lead wires and hardware

130S24 Temperature Probe Housing

Includes: housing and hardware 130S26 Main PCB Fuse 130S27 Printer Paper Cover 130S28 Cable, DB9 Female to DB9 Female 42" long 130S29 Software, Repair 130S34 Kit, Repair, Nellcor SpO2 PCB with connector 130S35 Kit, Repair, SpO2 Cable (Nellcor) 130S36 Kit, Repair, SpO2 Cable to Main (Nellcor) 130S37 Upgrade, Software, Version 3.11 41P100** Check Valve 117S144** DC to DC Converter 114S588** Pressure Sensor 66S530** “Printer, Flat Cable” 5200-01 Cuff Assy, Adult with 1 tube bag 5200-02 Cuff Assy, Lg Adult with 1 tube bag 5200-03 Cuff Assy, Child Print with 1 tube bag 5200-04 Bag, Adult with cut tube 5200-05 Bag, Lg Adult with cut tube 5200-06 Bag, Child with cut tube 5082-59 Cuff, Adult Black 5082-61 Cuff, Lg Adult Black 5082-63 Cuff, Child Print 5200-07 Pressure Hose with new Luer fitting 5200-08 Calibration T connector 5200-20 Probe, Oral 9 Ft, Diatek 5200-22 Probe, Rectal 9 Ft, Diatek 5200-40 Sensor, SSpO2 Finger Clip (3 meter cord) (Nonin) 5200-41 Sensor, SpO2 Ear Clip (Nonin) 5200-42 Sensor, SpO2 Flex (Nonin) 5200-44 Sensor, SSpO2 Reflectance (Nonin) 5200-45 Holder, SpO2 Reflectance Sensor (Nonin) 5200-46 Sensor, SpO2 Adult Finger Flexi-form (Nonin) 5200-47 Sensor, SpO2 Ped Finger Flexi-form (Nonin) 5200-50 Tape, SpO2 Sensor Attachment (Nonin) 5200-51 Tape Strips, Hydrogel for SpO2 (Nonin) 5200-52 Cable, SpO2 Extension 3 Ft (Nonin) 5200-53 Kit, SpO2 Finger Phantom Calibration (Nonin) 5200-54 Sensor, SpO2 Finger Clip (1 meter cord) (Nonin) 5200-12 Tubing, straight 8 ft. with fitting 5200-56 Pediatric Finger Clip Sensor (Nonin) 9 ft. cable 5200-55 Extension Cord 10 ft. for SpO2 sensor (Nonin)

Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

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PART#: DESCRIPTION:

5200-60 Mobile Stand Kit 5200-61 Mobile Stand Kit, Modified 5200-62 Wall Mount Kit 5200-63 Wall Mount Kit, Modified 5200-64 IV Pole Kit 5200-65 IV Pole Kit, Modified 5200-66 Bed Rail Kit 5200-67 Bed Rail Kit, Modified 5200-68 Cuff Clip 5200-69 Accessory Pack 7052-25 Printer Paper (5 rolls) 5200-101 Transformer, USA 120V, 60 Hz 5200-102 Transformer, Europe 220V, 50 Hz 5200-103 Transformer, UK 230V, 50 Hz 5200-103 Transformer, Australia 230V, 50 Hz 5200-110 Power Cord, USA/Japan 5200-111 Power Cord, Europe 5200-112 Power Cord, UK 5200-113 Power Cord, Australia 5200-114 Power Cord, Switzerland 5200-115 Power Cord, South America 5200-84 Battery, 6 Volt Lead Acid D-25 OXISENSOR II adult digit oxygen transducer (Nellcor) D-25L OXISENSOR II adult digit oxygen transducer with long cable (Nellcor) D-20 OXISENSOR II pediatric oxygen transducer (Nellcor) R-15 OXISENSOR adult nasal oxygen transducer (Nellcor) I-20 OXISENSOR II infant digit oxygen transducer (Nellcor) EC-8 Extension Cable – 8 foot (Nellcor) OXICLIQ-A Adult oxygen transducer for use only with OXICLIQ sensor cable OC-3 (Nellcor) OXICLIQ-P Pediatric oxygen transducer for use only with OXICLIQ SENSOR CABLE MODEL OC-3 (Nellcor) OXI-A/N OXIBAND adult/neonatal oxygen transducer (Nellcor) OXI-P/I OXIBAND pediatric/infant oxygen transducer (Nellcor) RS-10 Reflectance oxygen transducer (Nellcor) D-YS DURA-Y oxygen transducer (Nellcor) SRC-2 Portable oximetry tester (Nellcor) DS100A DURASENSOR adult oxygen transducer (Nellcor) OC-3 Cable, OXICLIQ Sensors (Nellcor) D-YSE Ear Clip (use with DURA-Y sensor) (Nellcor) D-YSPD Pedicheck Pediatric Spot-Check (use with DURA-Y Sensor) (Nellcor) ASP-3 Sensor Assortment Pack (Nellcor) 05031-101 Diatek Probe Covers 5200-25 Temperature Cal. Key 01800-210 Model 9600 Temperature Cal. Kit 110V. 5200-85E Operations Manual 5200-86E Service Manual

Section 2: Service Set Up

* - Indicates that these parts can be traded in. If the part is under warranty, with a trade in you get full

credit. If the parts is out of warranty, you will get a 40% discount from the price.” ** - Only regional service centers may purchase these parts. See section 1.1 for ordering parts.

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Section 2: Service Set Up

2.4 Welch Allyn Vital Signs Monitor

Maintenance and Service Support

Owner Maintenance: Non-Technical customers can perform normal maintenance per the

instructions provided in the Operator Manual, Section V. End users will be able to perform basic operations such as replacement of: hoses, cuffs, probes, printer paper and batteries. On this level the unit will not be opened. However, opening of the WELCH ALLYN VITAL SIGNS MONITOR by untrained individuals may damage the unit and void the warranty.

Technical Service/Repair/Re-calibration: Properly trained and equipped bio-

medical departments and service centers will be able to utilize the content of this Service Manual. Technical skills in electronics and PC skills are required. These departments and centers must have service manual and re-calibration software, repair tools and test equipment as listed in this manual. They must also have minimum recommended quantities of repair parts and sub-assemblies. See the listings of repair parts and kits in this manual.

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SECTION 3:

Problem Diagnosis

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Section 3: Problem Diagnosis

3.1 Overview

The Welch Allyn Vital Signs Monitor can be diagnosed and repaired to board level without the necessity of electrical schematics.

Repair/Replace decisions will be made on the basis of information obtained from Calibration Software, Test Software, Printed Troubleshooting tables as seen in this section and in the Error Code Chart.

With a few exceptions, individual circuit board components will not be on the repair bill of materials, and therefore can not be ordered.

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Section 3: Problem Diagnosis

3.2 Diagnostic Procedure for

Returned Units

NOTES:

A. The word “unit” in this text refers to the WELCH ALLYN VITAL SIGNS MONITOR. B. Menu|Choice represents menu commands. Rather than use the phrase “choose the

exit command from the File menu.”

1. Remove the battery from the unit. Connect the unit to the power supply. Set the power

supply to 6.5 Vdc +/- 0.5 Vdc.

2. With a digital multi-meter, check the voltage of the battery. If the voltage of the battery

is less than 6.0 Vdc, the battery needs to be charged. Up on completion of this proce-

dure, place the battery back into the unit and plug in the charger. Let the battery

charge for 8 hours. Next allow the unit to sit for 1 day and recheck the battery voltage.

If the voltage is below 6.0 Vdc, change the battery. (Reference section 4.15)

3. Power up the unit. If the unit does not power up:

A. Insure the power supply is on and has the correct requirements as called out

in 1. (see above). B. The power supply is connected to the unit. C. Check that the fuse is not blown. (Reference section 4.2) D. Change the main PCB. (Reference section 4.3) E. Change the display PCB. (Reference section 4.6)

If the unit does power up:

4. To check the display PCB, observe the unit during power up. All of the LEDs should be lit for 1-2 seconds before the unit gets to its normal mode. If the unit has any LEDs out change the display PCB. (Reference section 4.6)

5 Run a couple of blood pressure cycles to ensure proper inflation/deflation and readings.

6. If the unit is not inflating/deflating properly:

A. Open up the unit by removing the 6 housing screws. B. Check the unit for pinched tubing if the unit is deflating too slowly. With the

housing opened, re-run the blood pressure cycle to see if the deflating problem has been fixed. Re-route tubing.

C. If there are no pinched tubes, change the valve.

(Reference section 4.13)

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Section 3: Problem Diagnosis

D. If this still does not clear up the problem of deflation too slow, change the pres-

sure switch. (Reference section 4.12)

E. Power down the unit. Place unit into detailed test mode by holding down the

“start” and “cancel” buttons as power is re-applied. Press the review button until “cal” appears in the systolic window. Press the “start” button to close the valve. Pump up the unit using the bulb and valve inflate the unit to 250 mmHg. Confirm the unit meets the specification for leak called out in the Repair Test Specification document. If the unit is leaking:

F. Pinch off the tubing leading to the pump. If this stops the leak, change the

pump. (Reference section 4.11)

G. Pinch off the tubing leading to the valve. If this stops the leak, change the valve.

(Reference section 4.13)

H. Pinch off the tubing leading to the transducer. If this stops the leak, change the

transducer. (Reference section 4.5)

I. Pinch off the tubing leading to the pressure switch. If this stops the leak,

change the pressure switch. (Reference section 4.12)

Welch Allyn Vital Signs Monitor Service Manual

Revision 4.0

7. If the unit is inflating/deflating properly however there is no reading given, change out the main PCB. (Reference section 4.3)

8. FOR THE PRINTER OPTION: Load the printer with paper if there is no paper. Press the form feed button to see if that will advance the paper. Next, press the print button to see if the unit will print. If these functions do not work, first change the printer PCB and re-test. If the problem is still evident, change out the printer itself. (Reference

section 4.13)

9. FOR THE SpO

OPTION: Connect the patient simulator to the unit SpO2 connection

by the Nonin or Nellcor cable (depending upon which is installed). Confirm readings equal to the specifications called out in Section 7. If there is no reading, change out the SpO

SpO

connector and PCB. (Reference section 4.9 or 4.10 depending on which

Module is installed)

10.FOR THE TEMPERATURE OPTION: Plug in the Diatek 9600 calibrator and set it for

96.4 F/ 35.8 C or use a water bath between 84 F (28.8 C) and 106 F (41.1 C). Remove the temperature probe and view the temperature window on the display. Make sure the temperature is in the “monitor mode.” This will be displayed at the bottom of the window. If the unit is not in monitor mode, wait approximately 40-60 seconds and the unit will automatically transfer into the monitor mode. Place the probe into the small hoe on top of the 9600 calibrator or into bath. If there is no reading place the probe back into its housing, remove and retry. If there is still no reading, change the probe and retry the test. If there is still no reading place the probe back into the housing, unplug the probe and plug in the cal-key, remove the probe and Confirm reading meets specifications called out in Section 7. If there is no reading at this point, change the temperature connector and PCB. (Reference section 4.8)

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Section 3: Problem Diagnosis

11.FOR THE RS232 OPTION: Connect the RS232 cable from the PC to the unit. Select

Unit|Information

screen, check the connection to the unit and the PC. Select

in the repair software. If a communication error appears on the PC

Tools|Options

to insure that the communication port that the cable is connected to is selected. Re-try the test. If the error is still present change out the main PCB.

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3.3 Calibration Procedure

3.3.1 VOLTAGE CALIBRATION

1. Connect the unit to the test station by hooking up the pneumatic tubing, cable from the PC, and removing the battery and connecting the power supply.

2. Place the unit into the “detailed test mode” by holding down the start and cancel buttons while powering up the unit. Allow the software versions to be displayed then press the review button until the unit displays “BAT” in the systolic window.

3. Go to the repair software and choose between 5.6 Vdc and 5.9 Vdc.

4. View the digital multi-meter (DMM) that is connected to the power supply reading the voltage. Move the cursor to the “Calibrated Voltage” box and type in the voltage that you observe on the DMM. In the software, click on “Update.”

5. The software will then prompt you to enter in a “Calibration Signature.” Move the cursor to the box and enter the three initials of your name. Then click “OK.”

6. At this point you should see the voltage on the display of the WELCH ALLYN VITAL SIGNS MONITOR change to match that of the DMM.

7. Adjust the power supply to 6.5 Vdc ± .05 Vdc.

Calibrate|Voltage

. Adjust the power supply to

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3.3.2 PRESSURE CALIBRATION

1. Connect the unit to the test station by hooking up the pneumatic tubing, cable from the PC, and removing the battery and connecting the power supply.

3. Go to the repair software and choose

4. Press the “Calibrate” button to begin the calibration procedure.

5. The software will first check to make sure that the units internal temperature is below 32°C. If it is not the user will be warned that they can not perform a calibration at this time.

6. If the temperature is within the 32°C limit the software will tell the unit to perform an auto-zero. If this is unsuccessful the user will be prompted to perform a zero potentiometer calibration. This is an automatic calibration. The user just needs to answer YES or NO. A no will cancel the calibration procedure.

7. Once a successful autozero has been completed the “Gain Calibration at 200 mmHg” box will be activated. This box consists of a slider control and a pressure display. To perform the span calibration pump the unit up to 200 mmHg +/- 5 mmHg using the bulb. Wait 15 seconds to allow the pressure to stabilize. Adjust the slide control until the reading on the PC matches as close as possible to the reading on the pressure standard. Once the difference has been minimized, Press “record” and proceed.

8. Once the gain calibration is complete the pressure calibration points can be calibrated. There are three points that require calibration, 95, 195 and 285 mmHg. First set the pressure to the desired value within +/- 5 mmHg of that value. Wait 15 seconds to allow the pressure to stabilize. Adjust the slide control until the reading on the PC matches as close as possible to the reading on the pressure standard. Press “record” after each setting. YOU MUST DO THIS FOR ALL THREE VALUES. Once this is completed press the “update” button.

Calibrate|Manometer

9. The software will then prompt you to enter in a “Calibration Signature.” Move the cursor to the box and type the three initials of your name. Then click “OK.”

10.Press Close to exit the calibration dialog box.

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3.4 Loading Unit Software

*WARNING: DO NOT REMOVE POWER OR TURN OFF UNIT DURING THE SOFTWARE LOADING OPERATION. The unit will be in an unrecoverable state if this happens.

1. Plug the wall transformer into the Welch Allyn Vital Signs Monitor.

2. Connect the unit to the RS232 cable of the test station.

3. Start the Repair Software by clicking on its icon. Go into Unit/Update Software.

4. Press the “Select File” button in the software.

5. Choose the correct unit software (cbpXXX.mot) file per instructions from the manufacturer. (Where “XXX” is the number of the software version to be loaded)

6. Once the software file is selected, press the “OK” button. This will return you to the Repair Software. The Repair Software will then ensure that the cbpXXX.mot file you are about to load into the unit is “Valid.” If so, press the “Load” button in the software. The unit will take about 10 minutes to load the software. (If the software file you have chosen is “Not Valid,” repeat steps 4 and 5, choose the correct version and then proceed. If problems persist, please contact your nearest Regional Service Center.)

NOTE: If the computer or the software malfunctions during the software loading operation, re-boot the computer, re-start windows and start the Repair Software. The Repair Software will start in the “Recovery Mode.” The software will prompt you to continue/ resume the software loading process.

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Section 3: Problem Diagnosis

3.5 Welch Allyn Vital Signs Monitor

Self Diagnostic Fault Codes

The following is a list of all possible error codes and their meanings.

MAIN BOARD ERROR CODES

ERROR CODE DESCRIPTION

CO1 User abort CO2 Auto-zero failure CO3 Inflation too fast CO4 Inflation too long CO5 Excessive noise CO6 Outside measuring range “ “ BP not available E10 Over pressure E11 Fail-safe violation E12 Ambient temp. limit E13 Battery failure E20 A/D failure E30 ROM failure E31 RAM failure E32 Factory EPROM checksum fail E33 User EPROM checksum failure E34 A/D converter failure E35 SpO E36 Temperature PCB failure E37 Printer failure E38 Real time clock failure

PCB failure

SpO

BOARD ERROR CODES (Both Nonin and Nellcor)

ERROR CODE DESCRIPTION

“—“ Sensor error E7 SpO “ “ SpO

PCB bad

off

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Welch Allyn Vital Signs Monitor Service Manual

TEMPERATURE BOARD ERROR CODES

ERROR CODE DESCRIPTION

E0.0 Stack RAM error E0.1 Internal RAM test failure E0.2 Internal ROM checksum failure E0.3 Instrument error E0.4 EEPROM checksum error E0.5 RAM checksum error E0.6 EEPROM busy too long E0.7 EEPROM address write error E1.0 External interrupt 0 E1.2 Transmitter interrupt E1.3 Timer Y interrupt E1.4 Timer 2 interrupt E1.5 External counter interrupt E1.6 Timer 1 interrupt E1.7 Serial I/O E1.8 Software break E2.0 Low cal. resistor pulse width error E2.1 High Cal. resistor pulse width error E2.2 PTB resistor pulse width error E2.3 Probe pulse width error E2.4 Could not determine cause E3.0 Low battery error E3.1 PTB test error E3.2 Outside operating temp. range E4.0 Floating point overflow E4.1 Log of zero undefined E5.0 Q warmer transistor error E5.1 C warmer transistor error E5.2 Warmer protection circuit failure

Revision 4.0

E5.3 Probe warmer not warming E5.4 Probe missing, thermistor failure E5.5 Warmer circuit failure E5.6 Warmer overheated E5.7 Warmer watch-dog time out E6.1 Serial overrun error E6.2 Serial framing error

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TEMPERATURE BOARD ERROR CODES (CONT’D)

ERROR CODE DESCRIPTION

E6.3 No data time out error E6.4 Transmit buffer overflow E9.1 Undefined software state C20 Probe missing or broken C21 Probe Characterization aborted P Probe position PC Probe characterization “ “ Temperature off

Section 3: Problem Diagnosis

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Section 3: Problem Diagnosis

3.6 Complaint/ Cause/ Corrective Action

COMPLAINT CAUSE CORRECTIVE ACTION

Does Not Power Up Battery Voltage LOW .......... Check Voltage Level

Battery Voltage Less

Than 5.4 Volts..................... Charge Battery

Fuse F1 Blown .................... Replace Fuse After Cause

Of Short Identified

Battery Connector ............... Verify Connection And Replace

Required Charge Light not on when

Charger Plugged in ............. Change Main PCB.U28 is blown.

Constant Alarm Overpressure ...................... Check For Pinched/Blocked Hose

Hardware Fails.................... Verify Performance Of The

Following Parts:

A) Pressure Switch

B) Transducer

C) Valve

D) Main PCB

Air Leak Pneumatic Connector ......... Check Seals

Pump................................... Verify Proper Operation

Valve................................... Verify Proper Operation

Check Valve Drivers

Unit Tubing.......................... Verify Connectors And

Integrity Of Hoses

Cuff ..................................... Verify Air Seal Of Coiled Hose

And Cuff Connectors

Verify Air Seal From Pneumatic

Connector Of Welch Allyn Vital Signs Monitor

To Coiled Hose.

Overpressure Switch........... Verify Connections And

Integrity Of Hose.

Verify Switch Operation.

SpO2 Failure SPO2 Board And Harness.. Replace Probe And Retest.

Verify All Connections To The

SpO2 Board

Replace

SpO2 Board.

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COMPLAINT CAUSE CORRECTIVE ACTION

Temp Failure Probe .................................. Replace Probe And Retest

Diatek Board & Harness ..... Verify All Connections To The

Temperature Board.

Opto-Reflector..................... Verify Probe Is Seen Only When

Removed From Holster.

Connector PCB................... Verify That The Temp Probe

Connector Is Properly Seated In The Connector On The Unit. Verify That The Connector From Diatek Board Is Connected To The Connector On The PCB.

Temp. Error Code ............... See Page 19

Printer Failure Flex Cable (Main PCB

To Printer PCB)................... Verify That The Flex Cable

From The Main PCB Is Fully Seated

In The Board Cable Connectors. Flex Cable (Printer

To Printer PCB)................... Verify That The Flex Cable From The

Printer To The Printer PCB Is Fully Seated

In The Board Cable Connector.

Paper Jam........................... Check Condition Of Paper Roll

In The Printer Housing.

Printer Home Position ......... Verify That The Printer Head Fully

Actuates The Printer Home Switch.

BP Readings High See pages 17 & 18 for ways to check to

ensure the monitor is accurate.

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Section 3: Problem Diagnosis

CHECKLIST FOR COMPARING AUTOMATED BP MONITORING TO MANUAL METHODS

• Blood pressure can vary between the left and right arm by as much as 20 mmHg on some patients. When comparing the Welch Allyn measurement to a manual reading on an opposite arm it is important to repeat the comparison after switching arms and then compare the average of both readings. This will help to eliminate the difference between the two arms.

• A person's blood pressure is continuously changing in reaction to their environment and physical state. Posture changes, conversation and other influences can easily cause a person's blood pressure to change dramatically. When comparing the Welch Allyn measurement to a subsequent manual reading on the same arm it is important to enure that the person's blood pressure has stabilized. To determine this, it is best to take a manual reading before and after the Welch Allyn reading. A stable subject should not have a change in systolic or diastolic of more than 5 mmHg.

• It is very important that both of the subject's arm remain in the same relative location throughout the test. One inch of elevation change will result in 1.8 mmHg change in the systolic and diastolic pressures.

• When taking the manual auscultatory reading it is very important to maintain a 3 mmHg/sec deflation rate. This deflation has been prescribed by the American Heart Association. Deflating the cuff too rapidly will result in an inaccurate blood pressure reading.

• Hearing acuity vary from individual to individual an can cause different blood pressure measurements on the same subject. This effect is compounded when a subject has very weak Korotkoff sounds. When taking auscultatory readings for comparison to the Welch Allyn, it is best to use a teaching stethoscope with two sets of binaurals and two persons trained in taking blood pressures. The two observers should write down their readings and not reveal the readings to each other, which may introduce bias. The two observers should agree within 5 mmHg for both systolic and diastolic, and the average of their readings used for the comparison. Inability of the two observers to agree within 5 mmHg denotes a subject which cannot be repeatedly measured by auscultation and should not be used for comparison.

• Proper cuff sizing is important. Using a cuff that is too small or too large will result in inaccurate blood pressure readings.

• Some situations can introduce a psychological bias in the auscultatory readings. For instance, a drug testing clinic wishing for subjects with systolic pressure below an acceptance threshold may result in biased low systolic readings, in some instances.

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CHECKLIST FOR COMPARING BP MEASUREMENTS MADE WITH THE WELCH ALLYN TO OTHER AUTOMATED MONITORS

• The Welch Allyn monitor has been validated according to the AAMI protocol using auscultatory readings. Many other manufacturer's monitors have been validated to the AAMI protocol

intra-arterial

blood pressure readings. Intra-arterial blood pressure readings do not necessarily agree with auscultatory readings. In fact, it is common for the diastolic pressure determined intra-arterially to be 7-10 mmHg lower than an auscultatory reading.

• Proper cuff sizing is important. Using a cuff that is too small or too large will result in inaccurate blood pressure readings.

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TEMPERATURE ERROR CODE CORRECTION

1. Turn the unit off.

2. Hold down the “Start” button as you turn the unit back on. Continue to hold down the “Start” button until the alarm signals dissipate.

3. Make sure that you see either a “2.4” or a “24” in the temperature window.

4. Press the “Review” button and you should see “CAL” in the systolic window.

5. Press the “Review” button again and you should see “BAT” in the systolic window.

6. Press the “Review” button again and make sure that three dashes (---) appear in the temperature window.

7. Once this has been confirmed, press the “Review” button until you see “2.4” or “24” in the temperature window. Make sure the probe is in the housing.

8. Turn the unit off, then turn the unit on allowing it to boot up into its normal mode.

9. Allow the “PC” to disappear from the temperature window.

10. Remove the probe from the housing. You should see a “1888” then “ORL” appear. If not, contact your local service department.

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CLINICAL VITAL SIGNS MONITOR OPERATOR MANUAL

Section 3: Problem Diagnosis

3.7 TROUBLE SHOOTING GUIDE

Symptom Possible Cause Explanations and

Corrective Action

1. Inaccurate Blood Pressure

Readings

Please note: Differences ‘10mmhg should be considered ‘normal and will occur for a number of reasons including intrapatient BP variability, observer hearing differences, and auscultatory deflation rate.

Incorrect Cuff Size

Patient’s Arm Position

Arm Movement During blood pressure cycle

Blood Pressure taken over clothing

Arrhythmia

Incorrect Reference

Determine correct cuff size:

• use reference markings on cuff

• measure patient’s arm circumference

midway between elbow and shoulder (see page 42 of Operator’s Manual to select correct cuff size).

Ensure Patient’s arm is at heart level.

Keep arm still during blood pressure cycle:

• movement may cause inaccuracies

from artifact

Blood Pressure should be taken on a bare arm.

Check for regularity of heart rate: (palpate pulse or check monitor)

• moderate to severe heart rate irregularities

may make blood pressure difficult to measure.

Use 4th Korotkoff sound to determine diastolic blood pressure.

• Many listener’s incorrectly equate diastolic

blood pressure with the disappearance of sound. The Vital Signs Monitor was developed using the 4th sound, as recommended by the American Heart Association.

Change in blood pressure from auscultatory reading to Vital Signs Monitor reading

Poor auscultatory sound recognition by observer

Deflate cuff no faster than 3mmhg per second:

• One of the major sources of error in ausculta-

tory blood pressure measurement is deflating the cuff to quickly. The American Heart Association recommends deflation no faster than 3mmhg per second.

Only use a spygnomometer that is known to be in calibration:

• Blood pressure taken with un-calibrated

sphygmomanometer may be very inaccurate.

Check blood pressure immediately prior to Vital Signs Monitor Reading

Use higher quality stethoscope Have a different observer check patient’s blood pressure

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Section 3: Problem Diagnosis

3.7 TROUBLE SHOOTING GUIDE

Sympton Possible Cause Explanations and

Corrective Action

2. Cuff Inflation &

Deflation With No Blood Pressure Reading Displayed.

display)

(or error code in

3. No Cuff Inflation

Temperature

Malfunction

• Error code displayed

Leak in pneumatic system Make sure all cuff attachments are tight.

Carefully check for tubing leaks on blood pressure cuff and tubing attachment to monitor.

Arm Movement During Cycle

Tubing Movement Artifact

Connections from

Keep arm still during blood pressure cycle:

• movement may cause inaccuracies from

artifact.

Do not contact tubing during blood pressure cycle

• movement may cause inaccuracies from

artifact.

Check all connections. (Do not over tighten).

monitor to cuff loose

Broken Probe

Replace Probe

Consult Technical Manual

Notify Biomedical department or Welch Allyn Customer Service (800) 854-2904

Wait for display window to read ORL before placing probe

• Low Temperature

Readings

• No Temperature Displayed

SPO2 Malfunction

• Sensor in place but no

SPO2 on display

• Inaccurate SPO2 Reading

Improper Probe Placement

Probe not Replaced

Improperly attached sensor

Cable incorrectly plugged into monitor

SPO2 disabled

Incorrect Sensor

Place probe in most posterior sublingual pocket

Notify biomedical or Welch Allyn Customer Service.

Replace probe in holder prior to taking another temperature.

insert the patient’s finger completely into sensor

Be sure sensor cable is correctly plugged into monitor

Be sure SPO2 is enabled with Mode button -

(SPO2 light will be off when disabled)

Assure that correct manufacturers sensor is in use - they are not interchangeable

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Section 3: Problem Diagnosis

3.7 TROUBLE SHOOTING GUIDE

Sympton Possible Cause Explanations and

Corrective Action

6. Printer Malfunction

7. Monitor Will Not

Power Up

8. Cuff Too Tight

(over inflation)

Paper will not advance

Low Battery

Monitor not plugged in

Pressure Preset too high

Consult Technical Manual Notify Biomedical or Welch Allyn Customer Service.

Check connections between monitor and transformer and wall receptacle.

Unplug unit from wall receptacle and check for breaks in cord. if connections secure and power supply is intact.

Notify Biomedical Department or Welch Allyn Customer Service.

Check pressure preset setting:

• Unless patient has underlying systolic hyper-

tension, set pressure preset at 160mmhg. (If Systolic blood pressure is greater than ‘pressure preset, monitor will automatically ‘increase an additional 40mmhg).

9. Cuff Popping Off

10. Cuff Deflating Too

Slowly

Inappropriate size cuff

Cuff applied inside out

Normal Operation

Pressure Preset too high

Determine cuff size with the cuff markings or refer to chart in Operator’s Manual for determining cuff size.

• If cuff continues to pop off, notify Biomedical

Department or Welch Allyn Customer Service.

Re apply cuff:

• make sure smooth surface of velcro is facing

patients arm

Deflate cuff no faster than 3mmhg per second:

• One of the major sources of error in ausculta-

tory blood pressure measurement is deflating the cuff too quickly. The American Heart Association recommends deflation no faster than 3mmhg per second.

Check pressure preset setting

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SECTION 4:

Major Component Removal

Revision 4.0

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4.1 Front Housing

ABSTRACT:

4.1 Opening up the front housing is necessary to replace the main printed circuit board (PCB), display board, switch pad and other components.

4.1.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.1.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door. Use

T112918 with the #4 Phillips bit.

__ Remove battery door.

front housing

is necessary when replacing the main fuse. Complete removal of the

Section 4: Major Component Removal/ReplacementW elch Allyn Vital Signs Monitor Service Manual

4.1.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

4.1.4 Opening front housing. __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 and the #6 Phillips bit. __ Carefully separate the front and rear housings.

4.1.5 Disconnection of connectors. __ Disconnect two (2) four-pin connectors (red) from top of main board to relieve strain. __ Unplug main 14-pin connector (red) from center of main PCB. __ Disconnect pressure line (1/16" tubing) from transducer. __ Disconnect the printer flex circuit from the main board. __ Disconnect 7-pin connector coming from the temperature connector PCB to the

temperature PCB.

__ Disconnect the green wire 2-pin connector from the main board.

Note the orientation of the green wire. It is towards the center of

the main PCB, or away from the temperature board. __ Disconnect the temperature connector plug from the temperature PCB. __ Remove the main PCB by removing the 7 torx screws with T112917 and

the torx t8 bit. Disconnect the flex cable that connects to the display PCB.

Remove the main PCB. __ Remove the 7 gray spacers. __ Remove the display PCB from front housing.

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The front housing is now free. Replace the front housing by assembling in reverse order following these special instructions.

4.1.6 Reconnecting the connectors. __ Reconnect the green wire 2-pin connector to the two male pins on the main board with the

wire contact (away from) the temperature board.

__ Carefully align all other connectors and flex circuits in mating connectors. Reassemble in reverse order. No special techniques required.

4.1.7 Verification of repair. __ Switch the unit to ‘on’ and perform a full functional check.

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4.2 Main Fuse f-1

ABSTRACT:

4.2 Removing and replacing the One possible cause of failure to ‘power up’ is an open fuse (blown fuse). Before replacing the fuse with a good one, troubleshoot the unit for an existing short circuit or high current drain. Follow the procedure as shown below. The front housing only has to be pulled away slightly from the rear housing to allow your fingers to reach the main fuse.

4.2.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.2.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door.

Use T112918 with the #4 Phillips bit.

__ Remove battery door.

main fuse f1. (t5ah

Section 4: Major Component Removal/ReplacementW elch Allyn Vital Signs Monitor Service Manual

250v) pn114s586.

4.2.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

4.2.4 Opening Front Housing __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 with the #6 Phillips bit. __ Carefully separate the front and rear housings.

4.2.5 Gaining access to fuse F1. __ Open 4 unit far enough to gain access to the fuse. __ Disconnect the top two red connectors to make opening easier.

Do not force the housings apart as this could damage components, board, wires or connectors.

__ Insert plastic trimmer adjustment tool under fuse and pry fuse out of holder. (use a trimmer

adjustment screwdriver or equivalent or any insulated tool that will fit between the fuse holder

body and the fuse body enabling you to pry the fuse out of the holder. __ Verify that the fuse you removed was in fact open. Check with dvm. __ If fuse is open (blown), troubleshoot to determine cause of the

overcurrent condition. See item 4.2.6 below. __ If fuse is closed (good), troubleshoot to determine other causes of failure of unit to ‘power up’.

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4.2.6 General procedure for testing for short circuit. __ Remove battery from unit. (this should have been done) __ Remove blown fuse from main PCB. __ Attach jumper wires between two sides of fuse block. __ Connect ohmmeter to red and black power input wires inside of the battery compartment. __ Resistance should not be less than infinity or ol (open leads). __ In case of dead short, continue to troubleshoot for short condition.

4.2.7 Installing fuse f1. __ Press replacement fuse service part 114s586 securely into fuse holder. __ Reconnect any plugs which were unplugged to gain access to the fuse block.

Reassemble in reverse order, no special techniques required.

4.2.8 Verification of repair. __ Switch the unit to ‘on’ and perform a full functional check.

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4.3 Main Printed Circuit Board (main PCB)

ABSTRACT:

4.3 Removing and replacing the one pneumatic line and electrical connectors. The small temperature board will be removed in the process. It can be swapped over to the replacement main PCB. It is held on by two of the seven torx fasteners.

4.3.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.3.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door.

Use T112918 with the #4 Phillips bit.

__ Remove battery door.

main PCB

requires that you remove the battery, split the cases, unplug

4.3.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

4.3.4 Opening front housing. __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 and the #6 Phillips bit.

__ Carefully separate the front and rear housings.

4.3.5 Note the orientation of the green wire. It is towards the center of the main PCB, or away from the

temperature board.

The front housing is now free of the rear housing.

4.3.6 Removal of temperature board from main PCB. __ Unscrew two torx fasteners with T112917 with the torx t8 bit and lift the temperature board

up and set it aside.

4.3.7 Separating the main PCB from the display PCB. __ Unplug the main PCB to display PCB flex circuit. __ Remove five (5) remaining torx fasteners with T112917 with the torx t8 bit and lift the main PCB

out of the front housing. Watch for the 7 gray spacers.

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Reassemble in reverse order with attention to the following details

4.3.8 Attaching the temperature board to the main PCB. __ Make sure all of the seven (7) gray plastic board spacers are in place before placing the main

PCB over the display PCB. __ Insert and tighten five of the last fasteners that were removed. __ Place the temperature board onto the main PCB and secure it with two torx fasteners.

4.3.9 Reconnect the temperature board connector to the main PCB socket. Reassemble in reverse order

4.3.10 Verification of repair. __ When completely assembled, switch the unit to ‘on’ and perform a full functional check,

including recalibration.

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4.4 DC to DC Con verter (SpO2 Units Only)

ABSTRACT:

4.4 To replace the

4.4.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.4.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door.

Use T112918 with the #4 Phillips bit.

__ Remove battery door.

4.4.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

DC to DC converter

, it is necessary to remove the main PCB.

4.4.4 Opening front housing. __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 and the #6 Phillips bit. __ Carefully separate the front and rear housings.

4.4.5 Disconnection of connectors. __ Disconnect two (2) four-pin connectors (red) from top of main board to relieve strain. __ Unplug main 14-pin connector (red) from center of main PCB. __ Disconnect pressure line (1/16" tubing) from transducer. __ Disconnect the printer flex circuit from the main board. __ Disconnect 7-pin connector coming from the temperature connector PCB to the temperature

PCB.

__ Disconnect the green wire 2-pin connector from the main board.

Note the orientation of the green wire. It is towards the center of the main PCB, or away from the temperature board.

The front housing is now free of the rear housing.

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4.4.6 Separating the main PCB from the display PCB. __ Unplug the main PCB to display PCB flex circuit. __ Remove seven (7) torx fasteners with T112917 with the torx t8 bit and lift the main PCB and

the temperature PCB out of the front housing.

4.4.7 Replacing the DC to DC converter from the main PCB. __ Peel off the rtv surrounding the old converter. __ De-solder the old converter. __ Clear the 8 holes out with a thru-hole solder sucker. __ Install a replacement converter as per figure 4.4.7 below. __ Secure with rtv (innerbond i-45) on all four sides.

W elch Allyn Vital Signs Monitor Service Manual

Main PCB Board

Revision 4.0

Allow RTV to cure overnight before closing up cases.

Reassemble in reverse order, no special techniques required.

PIN 1

Figure 4.4.7

4.4.8 Verification of repair. __ When completely assembled, switch the unit to on and do a full functional check,

including calibration.

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4.5 Pressure Transducer On Main PCB

ABSTRACT:

4.5 To replace the

4.5.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.5.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door.

Use T112918 with the #4 Phillips bit.

__ Remove battery door.

4.5.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

pressure transducer

on the main PCB, it is necessary to remove the main PCB.

4.5.4 Opening front housing. __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 and the #6 Phillips bit. __ Carefully separate the front and rear housings.

4.5.5 Disconnection of connectors. __ Disconnect two (2) four-pin connectors (red) from top of main board to relieve strain. __ Unplug main 14-pin connector (red) from center of main PCB. __ Disconnect pressure line (1/16" tubing) from transducer. __ Disconnect the printer flex circuit from the main board. __ Disconnect 7-pin connector coming from the temperature connector PCB to the temperature

PCB.

__ Disconnect the green wire 2-pin connector from the main board.

Note the orientation of the green wire. It is towards the center of the main PCB, or away from the temperature board.

The front housing is now free of the rear housing.

4.5.6 Separating the main PCB from the display PCB. __ Unplug the main PCB to display PCB flex circuit. __ Remove seven (7) torx fasteners with T112918 with the torx t8 bit and lift the main PCB and

the temperature PCB out of the front housing.

__ Do not lose the 7 gray spacers.

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4.5.7 Replacing the pressure transducer on the main PCB. __ De-solder the old transducer. __ Clear the 6 holes out with a thru-hole solder sucker. __ Install a replacement pressure transducer per figure 4.5.7 below.

W elch Allyn Vital Signs Monitor Service Manual

DC to DC

Converter

Revision 4.0

Lettering is on this side of module. #4 on lower left corner

Reassemble in reverse order, no special techniques required.

4.5.8 Verification of repair. __ When completely assembled, switch the unit to ‘on’ and perform a full functional check,

including recalibration.

Figure 5.5.7

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4.6 Display Printed Circuit Board (Display PCB)

ABSTRACT:

4.6 Removing and replacing the unplug one pneumatic line and electrical connectors, remove the temperature PCB and main PCB.

4.6.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.6.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door.

Use T112918 with the #4 Phillips bit.

__ Remove battery door.

display PCB

requires that you remove the battery, split the cases,

4.6.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

4.6.4 Opening front housing. __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 and the #6 Phillips bit. __ Carefully separate the front and rear housings.

4.6.5 Disconnection of connectors. __ Disconnect two (2) four-pin connectors (red) from top of main board to relieve strain. __ Unplug main 14-pin connector (red) from center of main PCB. __ Disconnect pressure line (1/16" tubing) from transducer. __ Disconnect the printer flex circuit from the main board. __ Disconnect 7-pin connector coming from the temperature connector PCB to the temperature

PCB.

__ Disconnect the green wire 2-pin connector from the main board.

Note the orientation of the green wire. It is towards the center of the main PCB, or away from the temperature board.

The front housing is now free of the rear housing.

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4.6.6 Separating the main PCB from the display PCB. __ Unplug the main PCB to display PCB flex circuit. __ Remove seven (7) torx fasteners with T112918 torx t8 bit and lift the main PCB and the

temperature PCB out of the front housing.

__ Remove the seven (7) gray board spacers as they will be reused.

4.6.7 Removing the display PCB from the front housing. __ Gently lift the display board out of the front housing.

Be careful not to damage the exposed LED’s.

Reassemble in reverse order with attention to the following details.

4.6.8 Place display PCB into front housing. __ Seat the display PCB over screw bosses. __ Place 7 spacers over front housing bosses projecting through PCB and seat them securely

against the surface of the PCB.

4.6.9 Attaching main PCB to the display PCB and front housing. __ Use all seven gray spacers to prevent damage to the boards. __ Gently lay the main PCB onto the spacers (component side up) so that all of the holes line up. __ Insert and tighten five (5) torx fasteners with T112917 with the torx t8 bit.

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4.6.10 Attaching the temperature board (option). __ Align the temperature board so that the component side faces towards the center of the unit.

Continue reassembly in reverse order of disassembly.

4.6.11 Verification of repair. __ When completely assembled, switch the unit to ‘on’ and perform a full functional check,

including recalibration.

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4.7 Key Pad (Switch Array)

ABSTRACT:

4.7 Removing and replacing the one pneumatic line and electrical connectors, and remove the main and display PCB’s from the front housing. If the key pad is being removed for suspected moisture or contamination, replace it with a new one once the PCB is cleaned.

4.7.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.7.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door.

Use T112918 with the #4 Phillips bit.

__ Remove battery door.

key pad

requires that you remove the battery, split the cases, unplug

4.7.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

4.7.4 Opening front housing. __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 and the #6 Phillips bit. __ Carefully separate the front and rear housings.

4.7.5 Disconnection of connectors. __ Disconnect two (2) four-pin connectors (red) from top of main board to relieve strain. __ Unplug main 14-pin connector (red) from center of main PCB. __ Disconnect pressure line (1/16" tubing) from transducer. __ Disconnect the printer flex circuit from the main board. __ Disconnect 7-pin connector coming from the temperature connector PCB to the temperature

PCB.

__ Disconnect the green wire 2-pin connector from the main board.

Note the orientation of the green wire. It is towards the center of the main PCB, or away from the temperature board.

The front housing is now free of the rear housing.

4.7.6 Separating the main PCB from the display PCB. __ Unplug the main PCB to display PCB flex circuit. __ Remove all seven (7) torx fasteners with T112918 with the torx t8 bit and lift the main PCB

and temperature PCB out of the front housing.

__ Remove the seven (7) gray board spacers as they will be reused.

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Section 4: Major Component Removal/Replacement

4.7.7 Removing the display PCB from the front housing. __ Gently lift the display board out of the front housing.

Be careful not to damage the exposed led’s.

4.7.8 Removing the key pad. __ Gently peel the old key pad away from the PCB. __ Inspect the PCB for contamination and clean accordingly with alcohol. Allow the alcohol to

evaporate for one minute then blow off lint. From this point on, do not touch contact surfaces.

Reassemble in reverse order with attention to the following details.

4.7.9 Attach new key pad to the display PCB.. __ Lay flexible key pad over PCB and exactly align protrusions over holes in PCB. __ Press protrusions into holes with tool T-112067. Be careful not to tear keypad.

4.7.10 Place display PCB into front housing. __ Seat the display PCB over screw bosses. __ Place 7 spacers over front housing bosses projecting through PCB and seat them securely

against the surface of the PCB.

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4.7.11 Attaching main PCB to the display PCB and front housing. __ Use all seven gray spacers to prevent damage to the boards. __ Gently lay the main PCB onto the spacers (component side up) so that all of the holes line up. __ Insert and tighten torx fasteners with T112917 with the torx t8 bit.

4.7.12 Attaching the temperature board (option). __ Align the temperature board so that the component side faces towards the center of the unit.

Continue reassembly in reverse order of disassembly.

4.7.13 Verification of repair. __ When completely assembled, switch the unit to ‘on’ and perform a full functional check,

including recalibration.

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4.8 Temperature PCB

ABSTRACT:

4.8 Removing and replacing the unplug one pneumatic line and electrical connectors. The small temperature board can be removed by unscrewing two Phillips head screws which hold the board to the two small “l” brackets. it is not necessary to remove the brackets from the main PCB.

4.8.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.8.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door.

Use T112918 with the #4 Phillips bit.

__ Remove battery door.

temperature PCB

requires that you remove the battery, split the cases,

4.8.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

4.8.4 Opening front housing. __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 and the #6 Phillips bit. __ Carefully separate the front and rear housings.

4.8.5 Disconnection of connectors. __ Disconnect two (2) four-pin connectors (red) from top of main board to relieve strain. __ Unplug main 14-pin connector (red) from center of main PCB. __ Disconnect pressure line (1/16" tubing) from transducer. __ Disconnect the printer flex circuit from the main board. __ Disconnect 7-pin connector coming from the temperature connector PCB to the temperature

PCB.

__ Disconnect the green wire 2-pin connector from the main board.

Note the orientation of the green wire. It is towards the center of the main PCB, or away from the temperature board.

The front housing is now free from the rear housing

4.8.6 Removal of temperature board from “l” brackets on the main PCB. __ Disconnect connector from main board socket. __ Disconnect the temperature connector cable from the temperature PCB. __ Unscrew two torx fasteners with T112917 with the torx t8 bit and lift the temperature board up.

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Section 4: Major Component Removal/Replacement

The temperature board is now free from the main PCB.

Reassemble in reverse order with attention to the following details.

4.8.7 Attaching the temperature board when main PCB was not removed.. __ Place a spacer on each Phillips head screw. __ Insert screw through board __ Place another spacer on each screw __ Thread screw into “l” bracket part way. __ Apply Locktite 222 on the end of the screw and thread all the way into the bracket.

4.8.8 Reconnect the temperature connector to main PCB socket. Reconnect the temperature connector cable to the temperature PCB.

Reassemble in reverse order

4.8.9 Verification of repair. __ When completely assembled, switch the unit to ‘on’ and perform a full functional check of the

temperature function.

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Section 4: Major Component Removal/ReplacementW elch Allyn Vital Signs Monitor Service Manual

4.9

Specific Oxygen Board (NONIN SpO

ABSTRACT:

4.9 Removing and replacing the move the front housing.

4.9.1 Preparing the unit for disassembly. __ Turn unit off and disconnect AC power cord from the unit. __ Disconnect all accessories from the unit. __ If the unit is pole mounted, remove unit from the pole. __ If the unit is wall mounted, remove unit from the wall. __ If the unit is free standing, turn the back towards you.

4.9.2 Battery cover removal. __ Remove four (4) Phillips head screws from the battery door.

Use T112918 with the #4 Phillips bit.

__ Remove battery door.

4.9.3 Battery removal from battery compartment. __ Remove the battery out of the compartment by turning the unit upside down and shaking until

battery begins to slide out. __ Disconnect the two (2) connectors. __ (If the battery is to be discarded, comply with all environmental regulations pertaining to

battery disposal.)

Nonin SpO

PCB

PCB)

requires that you remove the battery, and re-

4.9.4 Opening front housing. __ Position unit so the front panel is facing down. __ Remove six (6) Phillips screws with T112918 and the #6 Phillips bit. __ Carefully separate the front and rear housings.

4.9.5 Disconnection of connectors. __ Disconnect two (2) four-pin connectors (red) from top of main board to relieve strain. __ Unplug main 14-pin connector (red) from center of main PCB. __ Disconnect pressure line (1/16" tubing) from transducer. __ Disconnect the printer flex circuit from the main board. __ Disconnect 7-pin connector coming from the temperature connector PCB to the temperature

PCB.

__ Disconnect the green wire 2-pin connector from the main board.

Note the orientation of the green wire. It is towards the center of the main PCB, or away from the temperature board.

The front housing is now free from the rear housing.

4.9.6 Removing the __ Turn unit on its back and unscrew two torx screws from the board.

Use T112917 with the torx t8 bit. __ Disconnect tube from bottom of valve. __ Disconnect tube from pressure outlet fitting. __ Slide board out of well.

Nonin SpO2 PCB.

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Section 4: Major Component Removal/Replacement

4.9.7 Remove wires from board. __ Remove rtv from the back side of seven wire solder connections

shown below in figure 4.9.7 __ Unsolder wires from board as per figure 4.9.7 below. __ Remove solder from wires to prepare for new board.

yellow wire –J7 green wire – J6

orange wire

red wire

black wire

clear wire

white wire

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4.9.8 Checking wire connections by pin-out process. __ Each wire will terminate at a specific pin position on the SpO2 jack. Therefore, reconfirm

that all connections are correct by pinning out your work. Use figure 4.9.8 to verify connections.

green

red

yellow

black

orange

clear

white

Figure 4.9.8 SpO2 jack, wire side

4.9.9 Replacing the SpO2 board. __ Connect wires to locations as shown above. __ Cover bottoms of connections with

sealant)

376e108 (G.E. gray rtv #167, electronic adhesive

Reassemble in reverse order of disassembly.

Welch Allyn VITAL SIGNS MONITOR Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SECTION 1:

Table Of Contents

1.1 To Service Personnel:

1.2 Limited Warranty

Service Policy

Technical Assistance

1.3 Basic System Description

1.4 Basic System Operation

1.4.1 Blood Pressure Operating Modes

1.4.3 SpO Operating Mode

1.4.4 Pulse Rate Feature

1.6 Specifications

1.6.1 Performance Specifications

1.6.2 Technical Specifications:

1.6.3 Printer T echnical Specifications

1.7 Serial Numbering System Defined

1.8 Firmware Identification

SECTION 2:

2.1 Intent of Manual and Product Scope

2.2.1 Test Equipment Bench Layout:

Service Notes:

2.2.2 Welch Allyn Vital Signs Service Tools

2.3 Replacement Parts – Welch Allyn

Maintenance and Service Support

SECTION 3:

3.1 Overview

3.2 Diagnostic Procedure for

3.3 Calibration Procedure

3.4 Loading Unit Software

Self Diagnostic Fault Codes

3.6 Complaint/ Cause/ Corrective Action

TEMPERATURE ERROR CODE CORRECTION

SECTION 4:

front housing

4.2 Main Fuse f-1

DC to DC converter

pressure transducer

key pad

temperature PCB