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
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