Mindray Datascope Duo User manual

Ser vice M anual

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

Ser vice M anual

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

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

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

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
SpO2 Overview.......................................................................................................................................	1	- 6
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
SpO2 Verification ...........................................................................................................................................	2	- 8
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
SpO2 Interface Board Removal .................................................................................................................	4	- 6
SpO2 Board Removal...............................................................................................................................	4	- 6
CPU/Display Board Removal ....................................................................................................................	4	- 6
NIBP Module Removal .............................................................................................................................	4	- 6
Power Supply Removal.............................................................................................................................	4	- 7

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Table of Contents

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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.

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Introduction	Warnings, Precautions And Notes

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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, SpO2 (optional), and pulse rate on adult and pediatric patients. The Duo monitor can be powered by either the internal rechargeable Lithium-Ion battery or external 100~240 volt 50/60 Hz AC.

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1 - 1

Hardware Overview Theory of Operation

1.2

Hardware Overview

Patient Connectors

Fan

SpO2 Module

Driver

NIBP Module

Isolated SpO2

AC Input

Power Supply*

Power Supply

Keypad Switches

CPU / Display pcb

External

RS232 - TTL

Serial

Lithium-Ion

Interface

Inverter**

Interface**

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

1.2.1Power 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.

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

AC Input

Control Circuit

AC / DC

Converter

3.3v DC/DC

12v DC/DC

Converter

Battery and Charging

Management Circuit

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Duo™ Service Manual

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		110k Hz Drive frequency.
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.

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Hardware Overview	Theory of Operation

1.2.2Fan 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	Fan Driver		Fan
	Input	Circuit



FIGURE 1-3 Fan Driver Block Diagram
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.

1.2.3CPU/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 SpO2 module (SpO2 presence is detected via a jumper on JP1) and to drive the LED arrays and indicators.

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Duo™ Service Manual

Theory of Operation	Hardware Overview

A/D Converter

RTC/ E2 PROM

CPU

Keypad

SpO2

NIBP

Module

FPGA

User Interface

External

Serial Interface

Interface

LED Array

Indicator

Display

LEDs

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

Battery voltage

5B in

+5 vdc power supply

ADV

+10.5 vdc ADV out

RST

CPU reset line

XT2

11.0592 MHz clock

1.2.4NIBP 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.

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Hardware Overview	Theory of Operation

1.2.5SpO2 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 SpO2 value. The SpO2 sensor consists of two LEDs (one red and one infrared) and a 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 SpO2 board. The pulse rate is counted and the SpO2 value is determined by using an algorithm contained in the software on the SpO2 board.

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