Mindray Datascope Duo User manual

Service Manual

0070-01-0604-02_revB_Duo srv color.indd 1 3/10/10 5:17:19 PM

Service Manual

Duo™ is a U.S. trademark of Mindray DS USA, Inc.

f

Navigator

™

Masimo SET

is a U.S. trademark of Mindray DS USA, Inc.

®

, LNOP® and CleanShield® are U.S. registered trademarks of Masimo Corp.

Copyright

©

Mindray DS USA, Inc., 2008. All rights reserved. Contents of this publication may not be reproduced in any

orm without permission of Mindray DS USA, Inc.

0070-10-0604-01 Duo Service Manual

Table of Contents

Foreword....................................................................................................................................................... iii

Warnings, Precautions And Notes ....................................................................................................................iii

Theory of Operation ......................................................................................................... 1 - 1

Introduction.................................................................................................................................................... 1 - 1

Hardware Overview ....................................................................................................................................... 1 - 2

Power Supply Board ................................................................................................................................ 1 - 2

Fan Driver Board Overview ...................................................................................................................... 1 - 4

CPU/Display Board Overview .................................................................................................................. 1 - 4

NIBP Module Overview............................................................................................................................ 1 - 5

Overview....................................................................................................................................... 1 - 6

SpO

2

Calibration and Performance Verification .......................................................................... 2 - 1

Introduction.................................................................................................................................................... 2 - 1

Warnings and Guidelines................................................................................................................................ 2 - 2

Test Equipment and Special Tools Required........................................................................................................ 2 - 2

Calibration and System Checks ........................................................................................................................ 2 - 3

Device Appearance and Installation Checks................................................................................................ 2 - 3

Maintenance Functions/Non-Monitoring Modes .......................................................................................... 2 - 3

Unit of Measure Mode ............................................................................................................................. 2 - 3

Software Version Mode............................................................................................................................ 2 - 4

Safety Test ..................................................................................................................................................... 2 - 5

Test Equipment ........................................................................................................................................ 2 - 5

Case Leakage ......................................................................................................................................... 2 - 5

NIBP Calibration............................................................................................................................................. 2 - 6

Test Equipment ........................................................................................................................................ 2 - 6

Test Procedure......................................................................................................................................... 2 - 6

Verification ........................................................................................................................................... 2 - 8

SpO

2

Test Equipment ........................................................................................................................................ 2 - 8

Test Procedure......................................................................................................................................... 2 - 8

Parts ................................................................................................................................ 3 - 1

Introduction.................................................................................................................................................... 3 - 1

Parts Listing .................................................................................................................................................... 3 - 10

Repair Information ........................................................................................................... 4 - 1

Introduction.................................................................................................................................................... 4 - 1

Troubleshooting Guide .................................................................................................................................... 4 - 2

Disassembly Instructions................................................................................................................................... 4 - 6

Tools Needed ......................................................................................................................................... 4 - 6

Front Housing Removal............................................................................................................................. 4 - 6

Interface Board Removal ................................................................................................................. 4 - 6

SpO

2

Board Removal............................................................................................................................... 4 - 6

SpO

2

CPU/Display Board Removal .................................................................................................................... 4 - 6

NIBP Module Removal ............................................................................................................................. 4 - 6

Power Supply Removal............................................................................................................................. 4 - 7

Duo™ Service Manual 0070-10-0604-01 i

Table of Contents

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ii 0070-10-0604-01 Duo™ Service Manual

Foreword Introduction

Foreword

This service manual gives a detailed description of the Duo Portable Patient Monitor,
including circuit descriptions, test and calibration procedures, and spare parts listings. This
manual is intended as a guide for technically qualified personnel during repair, testing, or
calibration procedures.

Warnings, Precautions And Notes

Please read and adhere to all warnings, precautions, and notes listed here and in the
appropriate areas throughout this manual.

A WARNING is provided to alert the user to potential serious outcomes (death, injury, or
serious adverse events) to the patient or the user.

A CAUTION is provided to alert the user to use special care necessary for the safe and
effective use of the device. They may include actions to be taken to avoid effects on patients
or users that may not be potentially life threatening or result in serious injury, but about which
the user should be aware. Cautions are also provided to alert the user to adverse effects on
this device of use or misuse and the care necessary to avoid such effects.

A NOTE is provided when additional general information is applicable.

Duo™ Service Manual 0070-10-0604-01 iii

Introduction Warnings, Precautions And Notes

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iv 0070-10-0604-01 Duo™ Service Manual

1.0

Theory of Operation

1.1 Introduction

The Duo is a compact, lightweight, portable patient monitor intended for monitoring the
following vital signs: blood pressure, SpO
patients. The Duo monitor can be powered by either the internal rechargeable Lithium-Ion
battery or external 100~240 volt 50/60 Hz AC.

(optional), and pulse rate on adult and pediatric

2

Duo™ Service Manual 0070-10-0604-01 1 - 1

Hardware Overview Theory of Operation

1.2 Hardware Overview

Patient Connectors

Fan
Driver

AC Input

Power Supply

Lithium-Ion

Battery

FIGURE 1-1 Interconnection Block diagram

*The Isolated SpO2 Power Supply is present with optional Masimo and Nellcor SpO2 ONLY.
** The RS232 - TTL Inverter and Serial Interface Connector is used for software updates by Service

1.2.1 Power Supply Board

Overview

The AC/DC converter transforms the AC input voltage (90 - 264 vac 50/60 Hz) to a DC
voltage used to charge the internal Lithium-Ion battery and supply power to the +12 vdc and
+3.3 vdc DC/DC converters. The battery charging circuit will actively charge the battery
while the Duo is connected to an AC source. Battery charging takes place whether the
monitor is on, off, or in use. The power supply will automatically switch to the internal battery
if an AC source is not present.

External
Interface

NIBP Module

Keypad Switches

CPU / Display pcb

RS232 - TTL
Inverter**

Module

SpO

2

Isolated SpO
Power Supply*

2

Serial
Interface**

NOTE: The power supply board MUST be connected to a resistive

load to operate properly and to avoid damage due to an
over current condition.

Power ON / OFF
Control Circuit

AC Input

AC / DC

Converter

Battery and Charging
Management Circuit

1 - 2 0070-10-0604-01 Duo™ Service Manual

3.3v DC/DC
Converter

12v DC/DC
Converter

Theory of Operation Hardware Overview

FIGURE 1-2 Power Supply Block Diagram

Power Supply Voltage Test Points:

Location Function

Measure across C5 Primary Rectified Voltage (DC). Range: 105 - 374 volts.

C5 Negative Lead Primary Ground.

Measure across Q1 pin1 and
C5 Negative Lead

Measure across C12 +10.5 vdc input for Fan Driver board.

C12 Negative Lead Secondary Ground.

C47 Positive Lead +5 vdc supply for Power On/Off Control.

C50 Positive Lead +3.3 vdc output.

C68 Positive Lead +12 vdc output.

110k Hz Drive frequency.

Duo™ Service Manual 0070-10-0604-01 1 - 3

Hardware Overview Theory of Operation

1.2.2 Fan Driver Board Overview

The Fan Drive Board is active during the battery charging cycle. The Temperature Detector
senses the temperature of the heat sink of the Secondary Rectifier diode and turns on the fan
when the heat sink reaches a certain temperature.

Temperature
Detector

DC
Input

FIGURE 1-3 Fan Driver Block Diagram

Fan Driver
Circuit

Fan Driver Board Test Points

Location Function

Measure across C202 +5 vdc Fan power.

C202 Negative Lead Ground.

Measure between Q202 pin1 and Ground Drive frequency when the Fan is activated.

1.2.3 CPU/Display Board Overview

The CPU/Display board controls the SpO2 Module and NIBP Module through
communications via UART devices. The CPU Board receives user commands from the
Keypad. The power supply board provides +3.3 vdc and +12 vdc to the CPU board. These
voltages are monitored by an A/D converter located on the CPU board. The CPU also
controls an integral LED display array and indicator LEDs. The main processor has a built-in
serial port that is used to load software. The processor also uses a FPGA to communicate
with the NIBP Module, the optional SpO
on JP1) and to drive the LED arrays and indicators.

Fan

module (SpO2 presence is detected via a jumper

2

1 - 4 0070-10-0604-01 Duo™ Service Manual

Theory of Operation Hardware Overview

A/D Converter

CPU

To
External
Interface

To
SpO2
Module

Serial Interface

To
NIBP
Module

FPGA

FIGURE 1-4 CPU/Display Board Block Diagram

CPU Board Test Points

Location Function

VPP in +12 vdc power supply

VDD in +3.3 vdc power supply

BV Battery voltage

5B in +5 vdc power supply

RTC/ E

2

PROM

User Interface

LED Array

Display

Keypad

Indicator

LEDs

ADV +10.5 vdc ADV out

RST CPU reset line

XT2 11.0592 MHz clock

1.2.4 NIBP Module Overview

The Duo monitor determines non-invasive blood pressure using the oscillometric method. The
blood pressure cuff is inflated until the pressure in the cuff is sufficient to block blood flow in
the brachial artery. As the cuff begins to deflate, blood beginning to flow through the artery
will cause the artery to pulsate. These pulsations are transmitted through the blood pressure
cuff and connecting hose to the pressure transducer in the NIBP module. The output of the
pressure transducer is an analog pulsating signal. This signal is filtered by a high-pass filter
and then amplified. The amplified analog signal is then converted to a digital signal. The
digital signal is then processed to determine the systolic, diastolic, and mean pressures as
well as heart rate.

Duo™ Service Manual 0070-10-0604-01 1 - 5

Hardware Overview Theory of Operation

1.2.5 SpO2 Overview

Pulse oximetry (SpO2) measurement is used to determine the oxygen saturation level of the
patient's blood. The SpO2 numeric display indicates the amount of hemoglobin that has
bonded with oxygen molecules to form oxyhemoglobin. By analyzing the pulse in the
fingertip using specified algorithm and consulting the clinical data table, we can obtain the
SpO

value. The SpO2 sensor consists of two LEDs (one red and one infrared) and a

2

photodetector. The two LEDs are alternately lighted at a precise frequency. When the
capillary vessels of the fingertip are filled, a certain amount of light from the LEDs is
absorbed by blood in the capillaries. The remaining red and infrared light is then picked up
by the photodetector. The photodetector detects the varying light intensity due to pulsations
and transmits the changing light intensity in the form of changing electronic signals. The
amount of light absorption is then compared to the known fixed LED output by the SpO
board. The pulse rate is counted and the SpO

value is determined by using an algorithm

2

contained in the software on the SpO2 board.

2

1 - 6 0070-10-0604-01 Duo™ Service Manual

2.0

Calibration and Performance
Verification

2.1 Introduction

The following procedures are provided to verify the proper operation of the Duo monitor. A
menu driven interface is used to execute all verification tests. Performance tests should be
performed at least once per year and after any preventive maintenance or repair has been
performed.

Duo™ Service Manual 0070-10-0604-01 2 - 1

Warnings and Guidelines Calibration and Performance Verification

2.2 Warnings and Guidelines

In the event that the instrument cover is removed, observe the following warnings and
guidelines:

1. Do not short component leads together.

2. Perform all steps in the exact order they are given.

3. Use extreme care when reaching inside the opened instrument. Do not contact exposed

metal parts that may become ‘‘live’’.

4. Read through each step in the procedure so it is understood prior to performing the step.

2.3 Test Equipment and Special Tools Required

• 0-300 mmHg Digital or Mercury manometer with bulb and valve

• 500 cc Test Chamber/Dummy Cuff. P/N 0138-00-0001-03

•DVM

•SpO

• NIBP simulator

• Safety Analyzer (Dempsey model 431 or equivalent)

• Oscilloscope

• Laptop or PC (software upgrade)

simulator

2

2 - 2 0070-10-0604-01 Duo™ Service Manual

Calibration and Performance Verification Calibration and System Checks

2.4 Calibration and System Checks

2.4.1 Device Appearance and Installation Checks

Inspect the Duo monitor to ensure that:

• The outer housing is clean and has no scratches or cracks

• When the device is gently shaken, there are no loose components

• All keys are smooth and free for operation

• Labels are complete, clean, and accurate

• All connectors/accessory modules are installed securely
Ensure monitor is securely fastened to its rolling stand (if used)

2.4.2 Maintenance Functions/Non-Monitoring Modes

• When entering the maintenance functions/non-monitoring mode, the monitor will perform
a self-test, however the verification of functional LEDs will not be displayed

• In the maintenance mode, the standby mode will not be active

• In the maintenance mode, the auto-shutoff will activate if no key is pressed for a period of
15 minutes.

2.4.3 Unit of Measure Mode

The unit of measure mode is used to change between mmHg and kPa. To access the Unit of
Measure mode:

1. Turn the monitor off.

2. Simultaneously press and hold the POWER and CLEAR buttons.

3. Press the CLEAR button to cycle through the unit of measure choices.

4. Once the desired unit of measure is displayed, turn the Duo off to save that setting.

Duo™ Service Manual 0070-10-0604-01 2 - 3

Calibration and System Checks Calibration and Performance Verification

2.4.4 Software Version Mode

Use the following procedure to view the software version.

1. Ensure that the Duo is powered OFF.

2. Press and hold the Patient Size key.

3. While continuing to hold the Patient Size key, press and hold the

Power ON/OFF key for two (2) seconds until the Duo beeps.

4. Release both keys.

5. After an additional 2-second delay, Duo will display “100” in the Pulse Rate tile and a

number in the Information Codes tile.

6. Pressing the Clear key will cause the number displayed in the Pulse Rate tile to cycle

through a sequence of four numbers indicating which software version is being
displayed in the Information Codes tile as shown in the following table.

PULSE RATE TILE INFORMATION CODES TILE SHOWS

100 Host Software Revision Level

200 NIBP Software Revision Level

300 SpO2 Software Revision Level

7. To return to normal operation, press the Power ON/OFF key for two (2) seconds to

turn the Duo off.

8. You may then turn the Duo back on to resume normal operation.

NOTE: The Duo cannot be placed directly back into normal

monitoring mode from Software Version Mode. It must first
be powered OFF.

2 - 4 0070-10-0604-01 Duo™ Service Manual

Calibration and Performance Verification Safety Test

2.5 Safety Test

2.5.1 Test Equipment

• Safety Analyzer (Dempsey model 431 or equivalent)

2.5.2 Case Leakage

1. Plug the line cord of the unit into the safety analyzer.

2. Connect the case ground lead of the analyzer to the equipotential lug of the Duo

monitor.

3. Perform the leakage tests under the following conditions:

a. Case grounded:

Normal polarity
Normal polarity with open neutral
Reverse polarity

b. Case ungrounded:

Normal polarity
Normal polarity with open neutral
Reverse polarity

4. Verify the current reading is <100 uA under normal operating conditions; <300 uA

under single fault conditions for 120 VAC and <500 uA under single fault conditions for
230 VAC.

Duo™ Service Manual 0070-10-0604-01 2 - 5

NIBP Calibration Calibration and Performance Verification

2.6 NIBP Calibration

2.6.1 Test Equipment

• NIBP simulator

• NIBP test chamber/dummy cuff

• Manometer with bulb

2.6.2 Test Procedure

2.6.2.1 Transducer Accuracy

1. Connect the 500 cc Test Chamber and calibrated manometer via a ‘‘T’’ fitting to the

NIBP fitting on the Duo monitor under test.

2. Ensure the Duo is not turned on. Simultaneously, press and hold the POWER and NIBP

START/STOP buttons.

When the monitor enters the NIBP Calibration Mode, message code 525 will be
displayed in the Information Codes window. Release the buttons simultaneously.

3. Momentarily press the NIBP START/STOP button to start the NIBP calibration. Vent the

Test Chamber and verify the Duo and the manometer read zero. Using the bulb,
pressurize the test chamber to 50 mmHg and verify the Duo reading agrees with the
manometer +/- 3 mmHg. Using the bulb, increase the pressure to 200 mmHg and verify
the Duo reading agrees with the manometer +/- 3 mmHg.

2.6.2.2 Pneumatic Leak Test

1. Connect the 500 cc test chamber to the NIBP fitting on the Duo monitor under test.

2. From the NIBP Calibration Mode (code 525) momentarily press the CLEAR button on

the Duo keypad. The Duo will then switch to the Pneumatic Test Mode and will display
message code 550 in the Information Codes window.

3. Momentarily press the NIBP START/STOP button to start the leak test. The Duo under

test will automatically pressurize the test chamber to approximately 180 mmHg.

4. After approximately 20 seconds, the Duo under test will vent the pressure in the test

chamber and display a message code E06 (Pass) or E07 (Fail) in the systolic window.

2.6.2.3 Dynamic Repeatability Test

1. Restart unit and allow it to enter normal operating mode.

2. Use polyurethane tubing to connect the Duo monitor to a calibrated NIBP simulator and

the 500 cc test chamber/dummy cuff via a ‘‘T’’ fitting.

3. Select Adult patient size for both the Duo under test and the NIBP simulator.

4. Select a target simulated blood pressure within the ‘‘normal’’ range on the simulator.

5. Take 10 successive NIBP readings and compare the systolic, diastolic, mean and heart

rate readings for consistency. Readings should not deviate more than +/- 5 mmHg for
the NIBP readings and +/- 2 bpm or 2%, whichever is greater for heart rate.

2 - 6 0070-10-0604-01 Duo™ Service Manual

Calibration and Performance Verification NIBP Calibration

NOTE: The actual measured values displayed on the Duo monitor

may not compare with the selected target pressure on the
simulator. This test is intended to confirm the REPEATABILITY,
not accuracy, of dynamic NIBP readings. Accuracy can only
be confirmed by performing the NIBP Calibration outlined in
section 2.6 of this manual.

Duo™ Service Manual 0070-10-0604-01 2 - 7

SpO2 Ver i f i c a t i o n Calibration and Performance Verification

2.7 SpO2 Verification

2.7.1 Test Equipment

•SpO2 simulator

2.7.2 Test Procedure

1. Connect the appropriate SpO2 probe connector to the Duo monitor.

2. Connect the SpO

3. Set the simulator target values to:

= 98%

SpO

2

Pulse Rate = 70

4. Verify that the displayed SpO2 and pulse rate values on the Duo monitor are +/- 2% of

the simulator target values.

5. Change the simulator values.

6.

Verify the displayed values on the

probe to the SpO2 simulator.

2

Duo

monitor are equal to the simulator values +/- 2%.

2 - 8 0070-10-0604-01 Duo™ Service Manual

3.0

Parts

3.1 Introduction

This section contains exploded views of the Duo monitor, internal modules, and parts list.

Duo Service Manual 0070-10-0604-01 3 - 1

Introduction Parts

9

SpO2 Module

See SpO

4

Detail

2

6

5

8A

8

7

5

1

2

FIGURE 3-1 Duo Exploded View

3

3 - 2 0070-10-0604-01 Duo Service Manual

Parts Introduction

18

19

10

10

11

11

12

12

13

13

12

12

FIGURE 3-2 Masimo SpO2 Detail

14

14

Duo Service Manual 0070-10-0604-01 3 - 3

Introduction Parts

18

16a

12

16

15

10

FIGURE 3-3 Nellcor SpO2 Detail

17

17a

3 - 4 0070-10-0604-01 Duo Service Manual

Parts Introduction

19

5

21

20

3

4

5

11

5

22

Battery Latch Detail

FIGURE 3-4 Main Frame

Duo Service Manual 0070-10-0604-01 3 - 5

Introduction Parts

30

27

28

33

30

31

31

32

29

1

1

34

41

45

35

35

25

28

26

29

24

27

23

26

FIGURE 3-5 Rear Case Assembly

33

36

3 - 6 0070-10-0604-01 Duo Service Manual

Parts Introduction

9

9

34

37

35

38

39

36

40

37

38

41

40

43

FIGURE 3-6 Front Case Assembly

39

42

Duo Service Manual 0070-10-0604-01 3 - 7

Introduction Parts

FIGURE 3-7 Battery Connector Assembly Detail

3 - 8 0070-10-0604-01 Duo Service Manual

Parts Introduction

g

Screws,
mounting plate*

Washers, locking*

Utility basket

Mounting screw
for basket*

Casters, Non locking

Duo monitor
mounting plate*

Mounting screw
for basket*

Casters, lockin

FIGURE 3-8 Duo Rolling Stand

Replacement Parts, Duo Rolling Stand

DESCRIPTION PART NUMBER

Duo rolling stand, value DUOROLLSTD

Duo monitor mounting kit 0406-00-0857-01

Casters, Non locking 0401-00-0045

Casters, Locking 0401-00-0046

Utility basket 0202-00-0166

* Included in Duo monitor mounting kit

Washers, locking*

Mounting bolts, pole*

Duo Service Manual 0070-10-0604-01 3 - 9

Parts Listing Parts

3.2 Parts Listing

REF. NUMBER PART NUMBER DESCRIPTION

1 0211-00-0146 Housing Screw (metric panhead)

2 0380-00-0475 Rear Housing

3 0441-00-0107 Chassis

4 0671-00-0045 Power Supply Board

5 0211-00-0145 Metric Panhead Screw

6 0671-00-0044 CPU/Display Board

7 0213-00-0032 Self Tapping Screw

8 0380-00-0472 Nellcor Connector Shroud

8A 0380-00-0473 Masimo Connector Shroud

9 0380-00-0476 Front Housing

10 0012-00-1595 SpO

11 0671-00-0246 Masimo Isolated Power Board

12 0211-00-0143 Screw

13 0671-00-0243 Masimo SpO

14 0012-00-1474 Masimo Flex Cable

15 0671-00-0247 Nellcor Isolated Power Board

16 0671-00-0242 Nellcor SpO

16a 0671-00-0066 Nell-3 SpO

17 0012-00-1457 Nellcor Flex Cable

17a 0012-00-1661 Nellcor Flex Cable

18 0386-00-0308 SpO

19 0104-00-0037 NIBP Module

20 0671-00-0063 Fan Driver Board

21 0671-00-0043 Battery Connector Board

22 0380-00-0481 Battery Latch

23 0380-00-0474 Battery Door

24 0346-00-0052 Battery Door Tether

25 0012-00-1592 Fan with cable

26 0348-00-0216 Fan Gasket

27 0213-00-4014 Screw

28 0386-00-0310 Fan Mounting Plate

29 0380-00-0471 Filler Panel

30 0367-00-0084 Handle

31 0211-00-0147 Handle Screw (metric panhead)

32 0334-00-1603-03 Rear Label, Lower, S/N

33 0348-00-0202 Foot

34 0380-00-0480-01 Power Switch Plunger

35 0380-00-0480-02 Clear Switch Plunger

36 0380-00-0480-03 Patient Size Switch Plunger

37 0380-00-0480-04 Start NIBP Switch Plunger

N/S - Not Shown

Power Cable

2

Board

2

Board

2

Board

2

Mounting Plate

2

3 - 10 0070-10-0604-01 Duo Service Manual

Parts Parts Listing

REF. NUMBER PART NUMBER DESCRIPTION

38 0330-00-0052 Keypad Overlay

39 0103-00-0411 Pneumatic Fitting

40 0386-00-0309 Mounting Plate

41 See table below Rear Label, Upper

N/S See table below Display Overlay

N/S See table below Connector Label

N/S - Not Shown

Display Overlay

LANGUAGE OPTION PART NUMBER

English NIBP Only 0330-00-0053-01

English NIBP/SpO

2

0330-00-0053-11

Upper Rear Label

LANGUAGE PART NUMBER

English 0334-00-1641-01

Connector Label

DESCRIPTION PART NUMBER

No SpO

Masimo SpO

Nellcor SpO

2

2

2

0334-00-1602-01

0334-00-1602-02

0334-00-1602-04

Duo Service Manual 0070-10-0604-01 3 - 11

Parts Listing Parts

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4.0

Repair Information

4.1 Introduction

This chapter of the Duo Service Manual provides the necessary technical information
needed to perform repairs on the instrument. The most important prerequisites for effective
troubleshooting are a thorough understanding of the instrument functions as well as an
understanding of the theory of operation.

To P1 on Main
Control Board

To P1 on Main
Control Board

External
Interface

Serial
Interface

Battery P1

Fan

RS232<>TTL
Inverter

Power
Supply
Board

Fan

P2 P1

Drive
Board

P2

P3

FIGURE 4-1 Module Interconnection

Isolated
Power

P1 P2

Board

Isolated
Power

P1 P2

Board

P5

Main

P3

Control
Board

P4

P1

P2

Masimo
SpO2

J3 J1

Module

Nellcor
SpO2

J2 J1

Module

P1

NIBP
Module

SpO2
Sensor

SpO2
Sensor

Cuff

Duo™ Service Manual 0070-10-0604-01 4 - 1

Troubleshooting Guide Repair Information

4.2 Troubleshooting Guide

Error Codes and Solutions

MESSAGE/
PROBLEM REASON SOLUTION

E01 NIBP Self Test Error NIBP Module hardware failure

E02 NIBP Communications

Error

E03 Loose Cuff Cuff is not properly wrapped or no cuff is present

E04 Air Leak Cuff, hose or connector is damaged, internal leak

E05 Air Pressure Failure Stable pressure value is not available (e.g. hoses

E06 Successful Pneumatic

Test

E07 Pneumatic Test Failed/

Pneumatic Leak

E08 Weak Signal Cuff is too loose or patient pulse is too weak

E09 Range Exceeded NIBP value exceeds the upper measurement limit

E10 Excessive Motion

Signal Saturated

E11 Over Pressure Pressure has exceeded the specified upper safety

E12 NIBP System Failure Operation of blood pressure pump system has

E13 NIBP Time Out Measuring time has exceeded 120 seconds

E14 NIBP Illegally Reset Unexpected NIBP reset

E15 NIBP Reset Failed NIBP reset failed

E16 NIBP Communications

CRC Error

E17 NIBP Patient Size

Change Error

E20 Masimo SpO

Interference

E21 Masimo SpO

Perfusion

E22 Masimo SpO

Much Light

E23 Masimo SpO

Unrecognized Sensor

E24 Masimo SpO

Communication Error

E25 Masimo SpO

Fault

E26 Masimo SpO

Fault

E28 Masimo SpO

E29 Masimo SpO

Signal IQ

2

Low

2

Too

2

2

2

Board

2

Sensor

2

Timeout SpO2 data has been determined continuously for

2

Low

2

Communications with NIBP Module have failed

are pinched or occluded)

Indicates NIBP pneumatic test was successful

Leak detected during the pneumatic test

Monitor is detecting too much motion and/or
noise to obtain a reading

limit

failed

NIBP Serial Communication CRC failure

Attempt to change Patient Size failed

Noise detected on the pulse signal prevents pulse
discrimination

Patient perfusion is low

There is too much ambient room light for the
sensor to function properly

The monitor does not recognize the sensor

The monitor and the SpO2 module are not
communicating

The Masimo SET board has failed to operate
properly

Defective sensor

more than 2 minutes, so SpO
from the display

data has timed out

2

The SpO2 signal quality is poor

4 - 2 0070-10-0604-01 Duo™ Service Manual

Repair Information Troubleshooting Guide

Error Codes and Solutions (Continued)

MESSAGE/
PROBLEM REASON SOLUTION

E34 Masimo SpO2 Pulse

Rate Exceeded

E34 Nellcor SpO

Exceeded

E40 Nellcor SpO

Interference

E41 Nellcor SpO

PR

2

2

Check

2

Sensor

E42 Nellcor SpO

Communication Error

E43 Nellcor SpO

Pulse

E44 Nellcor SpO

Signal

E45 Nellcor SpO

2

Weak

2

Weak

2

Board

2

Fault

E46 Nellcor SpO

E47 Nellcor SpO

Motion Motion is detected. The message is removed

2

Timeout SpO2 data has been determined continuously for

2

E501 Unit Battery Voltage

Low

E504 Unit Keyboard Error 1 Error with front panel keypad board

E505 Monitor Shut Off

Failure

E506 SpO

Module Not

2

Recognized

Pulse Rate value exceeds the measurement range

Pulse Rate value exceeds the measurement range

Noise is detected on the pulse signal, preventing
pulse discrimination from the noise. The
interference may be due to motion, excess
infrared light or electrical/optical interference.
The message is removed when the noise is
removed

The Nellcor module senses an unstable or illegal
sensor. This may be due to a poor connection or
a bad sensor. The user is required to reconnect
the same sensor or connect a new sensor. The
message will be removed once the Nellcor
module clears the error

The front end module is having problems
communicating (i.e.: framing errors or bad
checksums) with the Nellcor module

A pulse rate can not be determined and all other
measurement conditions are normal. The message
is removed when a pulse is detected

Noise is detected but a pulse rate can not be
discriminated. The message is removed when a
pulse is detected

The SpO2 board has malfunctioned

when No Pulse status is detected or when motion
ceases

more than 2 minutes, so SpO
from the display

data has timed out

2

Battery voltage is low

Monitor cannot be turned off normally

Monitor cannot communicate with SpO2 module
during self-test

Duo™ Service Manual 0070-10-0604-01 4 - 3

Troubleshooting Guide Repair Information

Monitor Failures

MESSAGE/
PROBLEM REASON SOLUTION

No display after
power-on, power
indicator does not
light.

NIBP or SpO
not function.

2

will

Bad line fuse Replace fuse

Bad power supply Replace power supply

Bad CPU/Display
board

CPU/Display board or
module failure.

Replace CPU/Display board

Isolate and replace defective board/module

4 - 4 0070-10-0604-01 Duo™ Service Manual

Repair Information Troubleshooting Guide

Module Failures

MESSAGE/
PROBLEM REASON SOLUTION

NIBP cuff cannot
be inflated.

Intermittently won't
take an NIBP
reading.

NIBP readings
inappropriately
high or low for
patient condition.

No SpO

SpO
inaccurate

reading SpO2 sensor or cable

2

value is

2

Pinched or leaking hose
or cuff

Loose cuff or patient
movement

Incorrect cuff size.
Incorrectly applied cuff

NIBP module is out of
calibration

damaged or
disconnected

Sensor not on patient

SpO2 sensor or cable
damaged or
disconnected

Sensor not on patient

Coloring agent (dye)
has been injected into
patient

Patient movement Keep patient quiet

Patient is cold Warm patient and retry

Patient is wearing nail
polish

Check hose and cuff. Replace as needed

Keep the patient quiet. Reapply cuff

Use appropriate size cuff. Ensure correct cuff
application

Calibrate/replace NIBP module

Check sensor placement and connection. Replace
if damaged

Check sensor placement and connection. Replace
if damaged

Retry after the coloring agent has dissipated

Remove nail polish

Duo™ Service Manual 0070-10-0604-01 4 - 5

Disassembly Instructions Repair Information

4.3 Disassembly Instructions

Before disassembling the unit, perform the following:

• Turn off the unit and remove the line cord

• Remove all cables and hoses

• Remove the battery

• Perform all maintenance on a properly grounded work station.

4.3.1 Tools Needed

• Phillips Screwdriver

• 5 mm nutdriver

4.3.2 Front Housing Removal

1. Remove four (4) 3 x 30 mm Phillips panhead machine screws from the corners of the

Rear Housing.

2. Carefully separate the front and rear housings and disconnect the cables from the CPU/

Display PCB connectors P02, P03 and P07. Disconnect the NIBP tubing from the front
housing pressure fitting.

4.3.3 SpO2 Interface Board Removal

1. Disconnect the cable from P01 on the CPU/Display pcb.

2. Remove three (3) 5mm hexnuts from their stand-offs on the SpO2 pcb.

3. Lift the SpO

Interface pcb from the stand-offs.

2

4.3.4 SpO2 Board Removal

1. Remove three (3) 5mm hex stand-offs from the SpO2 Board.

2. Remove one (1) 3 x 6 mm Phillips panhead machine screw from the SpO2 Board.

3. Lift the SpO

Board from the mounting bracket.

2

4.3.5 CPU/Display Board Removal

1. Remove four (4) 3 x 6 mm Phillips panhead machine screws from the corners of the

CPU/Display Board.

2. Lift the CPU/Display Board from the Front Housing.

4.3.6 NIBP Module Removal

1. Remove four (4) 3 x 6 mm Phillips panhead machine screws from the corners of the NIBP

module frame.

2. Lift the NIBP module from the battery housing frame.

4 - 6 0070-10-0604-01 Duo™ Service Manual

Repair Information Disassembly Instructions

4.3.7 Power Supply Removal

1. Remove the battery cable from P1 on the power supply PCB.

2. Remove four (4) 3 x 6 mm Phillips panhead machine screws from the corners of the

power supply PCB.

3. Remove one (1) 3 x 6 mm Phillips panhead machine screw from the line power entry

connector.

4. Slide the Power Supply pcb towards the bottom (open end) of the battery housing frame

until it can go no farther.

5. Lift the power supply PCB from the battery housing frame. Use care to avoid breaking

the positioning tab from the line power entry connector.

Duo™ Service Manual 0070-10-0604-01 4 - 7

0070-10-0604-01 Revision F July 12, 2010

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Tel: [phone] • Fax: [phone]

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