Service Manual
Contents
1. 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 and Ground Drive frequency when the Fan is activated CPU Display Board Overview The CPU Display board controls SpO gt 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 module presence is detected via a jumper on JP1 and to drive the LED arrays and indicators 0070 10 0604 01 Duo Service Manual Theory of Operation 1 2 4 Duo Service Manual Hardware Overview A D Converter RTC E PROM CPU Keypad To To SpO2 NIBP Module Module FPGA User Interface p To External Serial Interface Interface 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 voltage2. 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 Control Circuit AC Input AC DC Converter e 3 3v DC DC 12v DC DC Converter Converter Battery and Charging Management Circuit 0070 10 0604 0 I Duo Service Manual Theory of Operation Duo Service Manual Hardware Overview FIGURE 1 2 Power Supply Block Diagram Power Supply Voltage Test Points Location Measure across C5 C5 Negative Lead Measure across Q1 and C5 Negative Lead Measure across C12 C12 Negative Lead CA7 Positive Lead C50 Positive Lead C68 Positive Lead Function Primary Rectified Voltage DC Range 105 374 volts Primary Ground 110k Hz Drive frequency 10 5 vdc input for Fan Driver board Secondary Ground 5 vdc supply for Power On Off Control 3 3 vdc output 12 vdc output 0070 10 0604 0 1 1 3 Hardware Overview 1 2 2 1 2 3 Theory of Operation 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 Fan Driver gt ub m Fan Input Circuit
3. 10 0604 0 I Duo Service Manual Foreword Duo Service Manual 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 0070 10 0604 0 1 iii Introduction Warnings Precautions And Notes This page intentionally left blank iv 0070 10 0604 0 I Duo Service Manual io Theory of Operation 1 1 Introduction The Duo is a compact lightweight portable
4. high or low for patient condition Incorrect cuff size Incorrectly applied cuff NIBP module is out of calibration Use appropriate size cuff Ensure correct cuff application Calibrate replace NIBP module No SpO reading SpO sensor or cable damaged or disconnected Sensor not on patient Check sensor placement and connection Replace if damaged SpO value is inaccurate SpO sensor or cable damaged or disconnected Sensor not on patient Check sensor placement and connection Replace if damaged Coloring agent dye has been injected into patient Retry after the coloring agent has dissipated Patient movement Keep patient quiet Patient is cold Warm patient and retry Patient is wearing nail polish Remove nail polish 0070 10 0604 0 1 Disassembly Instructions 43 43 1 4 3 2 4 3 3 4 3 4 4 3 5 4 3 6 Repair Information Disassembly Instructions Before disassembling the unit perform the following e Turn off the unit and remove the line cord e Remove all cables and hoses Remove the battery Perform all maintenance on a properly grounded work station Tools Needed Phillips Screwdriver e 5 mm nutdriver 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 connecto
5. the Duo monitor are equal to the simulator values 2 0070 10 0604 0 I Duo Service Manual 30 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 Introduction Parts SpO2 Module See SpO Detail FIGURE 3 1 Duo Exploded View 0070 10 0604 01 Duo Service Manual Parts Introduction FIGURE 3 2 Masimo SpO Detail Duo Service Manual 0070 10 0604 0 1 Introduction Parts FIGURE 3 3 Nellcor SpO Detail 0070 10 0604 01 Duo Service Manual Parts Introduction Battery Latch Detail FIGURE 3 4 Main Frame Duo Service Manual 0070 10 0604 0 1 Introduction Parts FIGURE 3 5 Rear Case Assembly 3 6 0070 10 0604 01 Duo Service Manual Parts Introduction FIGURE 3 6 Front Case Assembly 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 Screws mounting plate Duo monitor Washers locking gt mounting plate d ed e Mounting screw T for basket Utility basket Mounting screw for basket Fi AHO CC J gt Casters Non locking gt is Casters locking S Washers locking Mounting bolts pole FIGURE 3 8 Du
6. 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 0 I Duo Service Manual Calibration and Performance Verification Safety Test 2 5 2 5 1 2 5 2 Duo Service Manual Safety Test Test Equipment e Safety Analyzer Dempsey model 431 or equivalent 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 0070 10 0604 01 2 5 NIBP Calibration 2 6 2 6 1 2 6 2 2 6 2 1 2 6 2 2 2 6 2 3 Calibration and Performance Verification NIBP Calibration Test Equipment NIBP simulator NIBP test chamber dummy cuff Manometer with bulb Test Procedure Transducer Accuracy 1 2 Connect the 500 cc Test Chamber and calibrated manometer via a fitting to the NIBP fitting on the Duo monitor under test Ensure the Duo is not
7. 15 minutes Unit of Measure Mode The unit of measure mode is used to change between mmHg and kPa To access the Unit of Measure mode l 2 3 4 Turn the monitor off Simultaneously press and hold the POWER and CLEAR buttons Press the CLEAR button to cycle through the unit of measure choices Once the desired unit of measure is displayed turn the Duo off to save that setting 0070 10 0604 0 1 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 return to normal operation press the Power ON OFF key for two 2 seconds to turn the Duo off 8 You may then
8. 5B in 5 vdc power supply ADV 10 5 vdc ADV out RST CPU reset line XT2 11 0592 MHz clock NIBP Module Overview LED Array Indicator Display LEDs 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 0070 10 0604 01 Hardware Overview 1 2 5 Theory of Operation SpO Overview Pulse oximetry SpO measurement is used to determine the oxygen saturation level of the patient s blood The SpO 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 SpO sensor consists of two LEDs one red and one infrared
9. 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 0070 10 0604 0 1 Duo Service Manual Parts Duo Service Manual REF NUMBER PART NUMBER Parts Listing 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 0330 00 0053 1 1 Upper Rear Label LANGUAGE PART NUMBER English 0334 00 1641 01 Connector Label DESCRIPTION PART NUMBER No SpO 0334 00 1602 0 1 Masimo SpO 0334 00 1602 02 Nellcor SpO2 0334 00 1602 04 0070 10 0604 0 1 Parts Listing Parts This page intentionally left blank 3 12 0070 10 0604 0 I Duo Service Manual iv Repair Information 4 1 Introduction This chapter of the Duo Service Manual provides the necessary technical information needed to
10. Service Manual Datascope Duo mindray NORTH AMERICA 0070 01 0604 02 revB Duo srv color indd 1 3 10 10 5 17 19 PM Service Manual Datascope Duo NORTH AMERICA Duo is a US trademark of Mindray DS USA Inc Navigator is a U S trademark of Mindray DS USA Inc Masimo SE qo 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 form without permission of Mindray DS USA Inc 0070 10 0604 01 Duo Service Manual Table of Contents E r tee Ee e e iii Warnings Precautions And Notes enne erre nennen iii Theory of Operation eee eee eee eee sesso eee sesso sooo ses eesosss see eeeesssseseeeeseeseseeseeeesesssseses T I Introduction Hardware e T LTD LCD DLL LII MET Power Supply Board EA E Fan Driver Board OYE ewa em e ea TERS NTG CRUZ Display Board Overview ie eret Sprite n Re E Sd Ee de NIBP Module Overview SPOF Overview osito pei eere Calibration and Performance Verification lisse M Warnings and Guidelines de iiem mte tea n ee be t betta teat Test Equipment and Special Tools Required e EE Be E Device Appearance and Installation Checks eee e em
11. 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 SpO board The pulse rate is counted and the SpO value is determined by using an algorithm contained in the software on the SpO board 0070 10 0604 0 I Duo Service Manual 2 0 2 1 Duo Service Manual Calibration and Performance Verification 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 0070 10 0604 0 1 Warnings and Guidelines 2 2 2 3 Calibration and Performance Verification Warnings and Guidelines In the event that the instrument cover is removed observe the following warnings and guidelines 2 3 4 Do not short component leads together Perform all steps in the exact order they are given Use extreme care when reac
12. as successful Test E07 Pneumatic Test Failed Leak detected during the pneumatic test 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 Monitor is detecting too much motion and or Signal Saturated noise to obtain a reading E11 Over Pressure Pressure has exceeded the specified upper safety limit E12 NIBP System Failure Operation of blood pressure pump system has failed 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 NIBP Serial Communication CRC failure CRC Error E17 NIBP Patient Size Attempt to change Patient Size failed Change Error E20 Masimo SpO Noise detected on the pulse signal prevents pulse Interference discrimination E21 Masimo SpO gt Low Patient perfusion is low Perfusion E22 Masimo SpO Too There is too much ambient room light for the Much Light sensor to function properly E23 Masimo SpO The monitor does not recognize the sensor Unrecognized Sensor E24 Masimo SpO The monitor and the SpO module are not Communication Error communicating E25 Masimo SpO Board The Masimo SET board has failed to operate Fault properly E26 Masimo SpOz Sensor Defective sensor Fault E28 Masimo SpO Timeout data has been determined continuously for more than 2 minutes so SpPO data has timed out from the disp
13. en Maintenance Functions Non Monitoring Modes Unit of Measure Mode seen Software Version Medea een d DI creola dee cat ets iv ttal sali otel sel SIE tare edle Test Equipment Case Ledkdge s ois ense tiet ive et rhet epe epe taut bes NIBP Calibration Test Equipment erento o FER Ye ERN FERES RE Rive da vader OPES WEEE TESE Procedures aske eee eee basti tbe ii SpOs Verification ende teo m d Rte bet diee ied eet tete da shades TeskEquipment auga saa ua rene eo no itte nom aea es Test Procedure Introductionis cte itn Fae oes em veteranene EE mec GET midd ea Repair Information eeeesvenereereseesnnneneressernnneneneessennneenenersnnnnnenesessnnnenenersernnneneenersernnnenenereerr 1 ue 4 1 Troubleshooting Guide ke SA 2 Disassembly Instruct Ons E PPAR Vlde eec debet dE ENS 6 Tools Needed 6 Front Housing Removal 6 SpO3 Interface Board Removal uterine de 4 6 SpOs Board Removal rare de lo tmt lane eer tre e pereat pede 4 6 EPU Display BoardiRemovalli nasale 4 6 NIBP Modul Removal sis dete bi e ge ee b 4 6 Power Supply Removals ito Baa TO SIND n qure Pa De AE 4 7 Duo Service Manual 0070 10 0604 01 i Table of Contents This page intentionally left blank ii 0070
14. er dummy cuff via a fitting Select Adult patient size for both the Duo under test and the NIBP simulator I Select a target simulated blood pressure within the normal range on the simulator 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 276 whichever is greater for heart rate 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 SpO Verification 2 7 2 71 2 7 2 Calibration and Performance Verification SpO Verification Test Equipment SpO simulator Test Procedure l 2 3 Connect the appropriate SpO probe connector to the Duo monitor Connect the SpO probe to the SpO simulator Set the simulator target values to SpO 98 Pulse Rate 70 Verify that the displayed SpO and pulse rate values on the Duo monitor are 2 of the simulator target values Change the simulator values Verify the displayed values on
15. hing inside the opened instrument Do not contact exposed metal parts that may become live Read through each step in the procedure so it is understood prior to performing the step 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 simulator NIBP simulator Safety Analyzer Dempsey model 431 or equivalent Oscilloscope Laptop or PC software upgrade 0070 10 0604 0 I Duo Service Manual Calibration and Performance Verification Calibration and System Checks 2 4 24 1 2 4 2 2 4 3 Duo Service Manual Calibration and System Checks 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 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
16. housing frame Use care to avoid breaking the positioning tab from the line power entry connector 0070 10 0604 0 1 4 7 0070 10 0604 0 1 Revision F July 12 2010 Mindray DS USA Inc 800 MacArthur Boulevard e Mahwah NJ 07430 e USA Dom Customer Service 1 800 288 2121 Intl Customer Service 1 201 995 8000 9 Dom Fax 1 800 926 4275 Intl Fax 1 201 995 8680 www mindray com Mindray Medical Netherlands B V e PO Box 26 3870 Hoevelaken e The Netherlands Tel 31 33 25 44 911 Fax 31 33 25 37 621 Mindray UK Limited e 3 Percy Road e St John s Park e Huntingdon e Cambridgeshire PE29 6SZ e United Kingdom Tel 01480 416840 Fax 01480 436588 Mindray Medical France SARL e Europarc Cr teil 123 Chemin des Bassins 94035 Cr teil Cedex e France e Tel 0 1 45 13 91 50 9 Fax 0 1 45 13 91 51 Mindray Medical German GmbH Zwischen den B chen 4 64625 Bensheim Germany Tel 49 6251 17524 0 Fax 49 6251 17524 20 Mindray Medical International Ltd e 2813 Office Tower Convention Plaza e No 1 Harbour Road e Wanchai e Hong Kong e Tel 852 2793 5596 Fax 852 2344 8824 0002 08 89 18
17. lay E29 Masimo SpO Low The SpO signal quality is poor Signal IQ 0070 10 0604 01 Duo Service Manual Repair Information Troubleshooting Guide Error Codes and Solutions Continued MESSAGE PROBLEM REASON SOLUTION E34 Masimo SpO Pulse Pulse Rate value exceeds the measurement range Rate Exceeded E34 Nellcor SpOz PR Pulse Rate value exceeds the measurement range Exceeded E40 Nellcor SPO Noise is detected on the pulse signal preventing Interference 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 E41 Nellcor SpO Check The Nellcor module senses an unstable or illegal Sensor 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 E42 Nellcor SpO The front end module is having problems Communication Error communicating i e framing errors or bad checksums with the Nellcor module E43 Nellcor SpO2 Weak A pulse rate can not be determined and all other Pulse measurement conditions are normal The message is removed when a pulse is detected E44 Nellcor SpO2Weak Noise is detected but a pulse rate can not be Signal discriminated The message is removed when a pulse is detected E45 Nellcor Board The S
18. o Rolling Stand Replacement Parts Duo Rolling Stand DESCRIPTION PART NUMBER Duo rolling stand value DUOROLLSTD Duo monitor mounting kit 0406 00 0857 0 1 Casters Non locking 0401 00 0045 Casters Locking 0401 00 0046 Utility basket 0202 00 0166 Included in Duo monitor mounting kit Duo Service Manual 0070 10 0604 01 3 9 Parts Listing 3 2 Parts Listing REF NUMBER PART NUMBER Parts 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 Power Cable 11 0671 00 0246 Masimo Isolated Power Board 12 0211 00 0143 Screw 13 0671 00 0243 Masimo SpO Board 14 0012 00 1474 Masimo Flex Cable 15 067 1 00 0247 Nellcor Isolated Power Board 16 0671 00 0242 Nellcor SpO Board 16a 0671 00 0066 Nell 3 SpO Board 17 0012 00 1457 Nellcor Flex Cable 17a 0012 00 1661 Nellcor Flex Cable 18 0386 00 0308 SpO Mounting Plate 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
19. pO board has malfunctioned Fault E46 Nellcor SpO Motion Motion is detected The message is removed when No Pulse status is detected or when motion ceases E47 Nellcor SpO2 Timeout SpO data has been determined continuously for more than 2 minutes so SpO data has timed out from the display E501 Unit Battery Voltage Battery voltage is low Low E504 Unit Keyboard Error 1 Error with front panel keypad board E505 Monitor Shut Off Monitor cannot be turned off normally Failure E506 SpO gt Module Not Monitor cannot communicate with SPO2 module Recognized during self test Duo Service Manual 0070 10 0604 0 1 Troubleshooting Guide Monitor Failures MESSAGE PROBLEM No display after power on power indicator does not light REASON Bad line fuse Bad power supply Bad CPU Display board Repair Information SOLUTION Replace fuse Replace power supply Replace CPU Display board NIBP or SpO will not function CPU Display board or module failure Isolate and replace defective board module 0070 10 0604 01 Duo Service Manual Repair Information Duo Service Manual Module Failures Troubleshooting Guide MESSAGE PROBLEM REASON SOLUTION NIBP cuff cannot Pinched or leaking hose Check hose and cuff Replace as needed be inflated or cuff Intermittently won t Loose cuff or patient Keep the patient quiet Reapply cuff take an NIBP movement reading NIBP readings inappropriately
20. patient monitor intended for monitoring the following vital signs blood pressure SpO optional and pulse rate on adult and pediatric patients The Duo monitor can be powered by either the internal rechargeable Lithium lon battery or external 100 240 volt 50 60 Hz AC Duo Service Manual 0070 10 0604 0 1 Hardware Overview 1 2 1 2 1 Theory of Operation Patient Connectors Fan Driver SpO Module NIBP Module Isolated SpO AC Input Power Supply Power Supply Keypad Switches CPU Display pcb Lithium Ion External RS232 TIL Serial x Battery Interface Inverter Interface FIGURE 1 1 Interconnection Block diagram The Isolated SpO Power Supply is present with optional Masimo and Nellcor SpO ONLY The RS232 TTI Inverter and Serial Interface Connector is used for software updates by Service 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 lon 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
21. 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 Isolated Masimo PI Power P2 13 SpO2 JI Board Module Isolated Nellcor PI Power P2 J2 SpO2 Jl Board Module P5 Pl P3 Main Control Board gt P2 NIBP Module External Interface Serial RS232 lt gt TTL Interface Inverter P2 Power Supply Board Battery PI P3 Fan Fan P2 Drive PI Board FIGURE 4 1 Module Interconnection Duo Service Manual 0070 10 0604 0 1 SpO2 Sensor SpO2 Sensor m Cuff Troubleshooting Guide Troubleshooting Guide Error Codes and Solutions Repair Information MESSAGE PROBLEM REASON SOLUTION EO 1 NIBP Self Test Error NIBP Module hardware failure E02 NIBP Communications Communications with NIBP Module have failed Error E03 Loose Cuff Cuff is not properly wrapped or no cuff is present 04 Air Leak Cuff hose or connector is damaged internal leak E05 Air Pressure Failure Stable pressure value is not available e g hoses are pinched or occluded E06 Successful Pneumatic Indicates NIBP pneumatic test w
22. rs PO2 and PO7 Disconnect the NIBP tubing from the front housing pressure fitting SpO Interface Board Removal 1 Disconnect the cable from PO1 on the CPU Display pcb 2 Remove three 3 5mm hexnuts from their stand offs on the SpO pcb 3 Lift the SpO Interface pcb from the stand offs SpO Board Removal 1 Remove three 3 5mm hex stand offs from the SpO Board 2 Remove one 1 3 x 6 mm Phillips panhead machine screw from the SpO Board 3 Lift the 5 Board from the mounting bracket 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 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 0070 10 0604 01 Duo Service Manual Repair Information 43 7 Duo Service Manual Disassembly Instructions 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
23. 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 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 Pneumatic Leak Test Connect the 500 cc test chamber to the NIBP fitting on the Duo monitor under test 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 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 After approximately 20 seconds the Duo under test will vent the pressure in the test chamber and display a message code E06 Pass or EO7 Fail in the systolic window Dynamic Repeatability Test Restart unit and allow it to enter normal operating mode Use polyurethane tubing to connect the Duo monitor to a calibrated NIBP simulator and the 500 cc test chamb
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