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Novametrix Medical Systems MARS PO2 TECH 2001 Service Manual

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Service Manual
Pulse Oximeter
Model 2001
April 25, 2001
Catalog Number 9400-90-01
Novametrix Medical Systems Inc. Wallingford, Connecticut, U.S.A. 06492.
Copyright 2000−2001. All rights reserved. No part of this manual may be reproduced
without the written permission of Novametrix Medical Systems Inc.

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  • Page 1 Pulse Oximeter Model 2001 April 25, 2001 Catalog Number 9400-90-01 Novametrix Medical Systems Inc. Wallingford, Connecticut, U.S.A. 06492. Copyright 2000−2001. All rights reserved. No part of this manual may be reproduced without the written permission of Novametrix Medical Systems Inc.
  • Page 3 SuperBright are trademarks of Novametrix Medical Systems Inc. Copyright 2000 Novametrix Medical Systems Inc. This document contains information which is proprietary and the property of Novametrix Medical Systems Inc., and may not be reproduced, stored in a retrieval system, translated, transcribed or transmitted in any form, or by any means, without prior explicit written permission from Novametrix Medical Systems Inc.
  • Page 4 Manufacturing, Quality and Safety [This page intentionally blank.] Model 2001 Service Manual Rev. 01...

  • Page 5: Table Of Contents

    Contents Patient Safety ........................1 Warnings ........................1 Cautions ........................2 Introduction ........................5 SpO2 Principles of Operation ..................5 Indications and Usage ....................6 Symbols ........................6 Illustrations ........................7 Front Panel ........................7 Rear and Top Panel ....................8 Theory of Operation ....................9 2726 Power Supply Board ...................9 AC Mains and Battery Operation Overview ............9 AC Mains Operation ..................10 Battery Operation .....................10...
  • Page 6 JTAG Emulation Interface ................24 Functional Test ......................25 Equipment Required ....................25 Procedure ......................... 25 Special Power Up Functions ..................26 Accuracy Test ......................27 Equipment Required ....................27 Procedure ......................... 27 Electronic Tests ......................29 Equipment Required ....................29 Procedure .........................

  • Page 7: Patient Safety

    Section 1 Patient Safety The SpO input for the Model 2001 Pulse Oximeter is electrically isolated. Patient leakage current flowing from the instrument to ground is limited to less than 25 mA at 120 VAC, 60 Hz. Patient isolation is greater than 10 MΩ, 4000 VAC rms at 60 Hz. The Model 2001 is Year 2000 compliant.

  • Page 8: Cautions

    Section 1 Patient Safety Cautions • Data Validity: As with all pulse oximeters, inaccurate SpO and Pulse Rate values may be caused by: • Incorrect application or use of a sensor • Significant levels of dysfunctional hemoglobin such as carboxyhemoglobin or methemoglobin •...
  • Page 9 Section 1 Cautions Patient Safety • Where electromagnetic devices (i.e. electrocautery) are used, patient monitoring may be interrupted due to electromagnetic interference. Electromagnetic fields up to 3V/m will not adversely affect system performance. • Federal (U.S.A.) law restricts this device to sale, distribution, or use by or on the order of a licensed medical practitioner.
  • Page 10 Section 1 Patient Safety Cautions [This page intentionally blank.] Model 2001 Service Manual Rev. 01...

  • Page 11: Introduction

    Introduction This manual describes the use and operation of the Model 2001 Pulse Oximeter Monitor from Novametrix Medical Systems Inc. Model 2001 is a lightweight, easy to use, pulse oximeter designed to be used in a variety of clinical settings. It provides reliable measurement, display and alerts for functional pulsatile oxygen saturation (SpO ) and pulse rate.

  • Page 12: Indications And Usage

    Section 2 Introduction Indications and Usage Model 2001 is calibrated to display “functional” saturation. This differs from the “fractional” saturation value displayed by most co-oximeters. Equation 1. Functional Functional Saturation = Saturation Calculation 100 - (COHb + METHb) = Fractional Hemoglobin COHb = Carboxyhemoglobin METHb = Methemoglobin Functional saturation represents the amount of oxyhemoglobin as a percentage of the...

  • Page 13: Illustrations

    Section 3 Illustrations Front Panel Alert Indicator. Flashes (red) when key. Press to ALERT RESET an alert/alarm occurs. Continues to disable active alert indicators. Alerts flash until condition corrected and will reactivate if alert condition still is pressed. exists. ALERT RESET key.

  • Page 14: Rear And Top Panel

    Section 3 Illustrations Rear and Top Panel Rear and Top Panel 1. Ground symbol: Equipotentiality. 7. Serial Output Connector: Serial (RS232) Connection to monitor’s chassis. data output here for use with RS232 interfaces. A female 25-pin “D” 2. Line Cord Clip: This clip can be set connector serves as the interface around the line cord strain relief so that connector.

  • Page 15: Theory Of Operation

    Section 4 Theory of Operation The Model 2001 is a microprocessor based instrument that measures the clinical parameters of oxygen saturation (SpO ) and pulse rate. The system contains all the circuitry necessary for controlling, collecting, conditioning and displaying patient information gathered from the Superbright™...

  • Page 16: Ac Mains Operation

    Section 4 Theory of Operation 2775 Main Board AC Mains Operation The AC Mains voltage enters the monitor at the rear panel Power Entry Module (PEM). This device contains a built in RFI power line filter, a double-pole single-throw switch that opens and closes both AC input lines, fuses, and an input voltage selection card.

  • Page 17: Power On/Off Control Circuitry

    Section 4 2775 Main Board Theory of Operation Power On/Off Control Circuitry See page 4 of 4 on schematic. The Model 2001 power on/off control circuitry consists of the VBACK supply (regulated by IC12), IC10, IC11 and the POWER key. When the battery or AC Mains is first applied to the power supply board (via VIN J102 pin 1), VBACK goes to +5 volts, provides power to IC10 and IC11, and through the C26 and RP4 (pins 3,4) network at IC10 pin 8, sets IC10 pin 2 to a logic Low.

  • Page 18: Voltage References

    Section 4 Theory of Operation 2775 Main Board The backup voltage (VBACK) is regulated by IC12 from the VIN supply. Capacitors C22 and C27 serve as filters and D17 allows VCC to power VBACK circuitry when the monitor is on. At this point D18 is biased off so IC12 is idle.

  • Page 19: Low Battery Voltage Shutdown

    Section 4 2775 Main Board Theory of Operation POWER key will toggle the Q1 output of IC10 and the monitor will turn off. This is done to prevent corruption of RAM and Real Time Clock data. Low Battery Voltage Shutdown See sheet 4 of 4 on schematic.

  • Page 20: Sensor Led Drive Circuits

    Section 4 Theory of Operation 2775 Main Board alert, and during a system power up self-test. See Calibrating the 20-Bit Analog-to-Digital Converters on page 9. Figure 1. Front-End Timing The data sampling sequence consists of: a. turn on the Red LED (RDLED*) and the Analog Sample line (ASAMP*) b.

  • Page 21: Sensor Photodiode Return Path

    Section 4 2775 Main Board Theory of Operation When RDLED* returns high (logic 1), Q14 is biased on, forcing IC36 pin 10 to ground potential: Q11 is biased off, and as a result, the Red LED in the sensor is also off. The Infrared LED drive circuit operates in the same manner as the Red LED drive discussed above.

  • Page 22: 20-Bit Analog-To-Digital Conversion

    Section 4 Theory of Operation 2775 Main Board operate while the CAL line is high. On the falling edge of the CAL signal, the ADC will initiate a calibration cycle determined by the state of the SC1 and SC2 inputs. The high at SC1 and the low at SC2 cause the Data Sampling Controller, IC42, to set INSIG* high and reset SIGND* to a logic low.

  • Page 23: Sensor Status Decoding And Conversion

    Section 4 2775 Main Board Theory of Operation Sensor Status Decoding and Conversion The microprocessor monitors several sensor parameters in addition to the Red and Infrared data channels. It monitors the status parameters, as well as the voltage of the monitor’s internal battery.

  • Page 24: Microprocessor

    Section 4 Theory of Operation 2775 Main Board IC36 pin 6, where it is summed with the -5 volt output from IC43. The resultant voltage at IC33 pin 1 will be approximately +2.81 volts with no photodiode input. This voltage drops as the (positive) photodiode signal at IC40 pin 1 increases.

  • Page 25: Real Time Clock (Rtc)

    Section 4 2775 Main Board Theory of Operation The RAM (IC20) is activated when its Chip Select line RAMCS* (IC20 pin 20) is brought low, via IC25 pin 8. When the ME* line at IC25 pin 5 is low, and the inverse of address line A17 at IC25 pin 4 is low, output pin 6 of IC25 will go low.

  • Page 26: Display Interface

    Section 4 Theory of Operation 2775 Main Board latch at IC14 pin 8 so that the CPU can detect if the unit is operating on AC line power (IC14 pin 8 high) or on battery power (IC14 pin 8 low). Diode D9 keeps current from back feeding into IC14 when the monitor is turned off but still connected to the AC line.

  • Page 27: Watchdog Timer

    Section 4 2775 Main Board Theory of Operation TML-Two Minute LED drives the LED on the front display. AOL-Audio Out LED drives the LED on the front panel. ARL-Alert LED drives the LED on the front panel. KJL*-drives Q17 when high which in turn drives the Alert Bar LEDs via J105. BTL-Battery Low LED on the front panel.

  • Page 28: Rs232 Serial Communication

    Section 4 Theory of Operation 2775 Main Board On the rising CKS signal a CLKS output pulse at IC18 pin 14 is sent as a serial clock input to the ADC selected by the decode lines. Decode results are shown below. Decode Red LED 20-bit ADC Infrared LED 20-bit ADC...

  • Page 29: 2776 Dsp Module

    Section 4 2776 DSP Module Theory of Operation is also brought to IC1 pin 10. The level shifted output at IC1 pin 7 is unused (except for factory test use). The Receive (RX) line at J101 pin 2 and the Clear To Send (CTS) line at J101 pin 6 are input signals to the Model 2001.

  • Page 30: Dsp Processor

    Section 4 Theory of Operation 2776 DSP Module select), serial data clocks (BCLKR0 & BCLKX0), and interrupt INT0. Since the UART is a 3.3V device communicating to a 5V host, IC8 is necessary to provide level shifting from 5V down to 3.3V.

  • Page 31: Functional Test

    Section 5 Functional Test The Functional Test verifies overall functional integrity of the monitor and sensors. If the monitor or sensors do not pass these tests, remove from use and contact the Novametrix Service Department for repair/replacement assistance. Equipment Required Finger Sensor, PN: 8776-00 (or equivalent) RS232 Test Fixture, PN: 5479-01 Procedure...

  • Page 32: Special Power Up Functions

    Section 5 Functional Test Special Power Up Functions a test. Perform the tests listed below, not all the test can be performed without specific test fixtures and jumpers (therefore the Automatic Test cannot be run). MONITOR TEST - 2 RAM Test MONITOR TEST - 3 ROM checksum Test MONITOR TEST - 4 Real Time Clock test MONITOR TEST - 5 Audio Volume Test (use Dec and Inc keys to change volume)

  • Page 33: Accuracy Test

    Section 6 Accuracy Test The Accuracy Test verifies the performance accuracy of the Model 2001 Pulse Oximeter monitor. This test is typically performed in conjunction with (after) the tests described in Section Functional Test Section 5, , on page 25. If the monitor does not pass the accuracy test, remove from use and contact the Novametrix Service Department for repair/replacement assistance.
  • Page 34 Section 6 Accuracy Test Procedure SIG ATTEN SENSOR OFF PATIENT to 1, verify “ ” appears on the display. Set ATTEN to 3, verify the error clears. FAULTY SENSOR Press and hold the RED button on the TB500B, verify “ ”...

  • Page 35: Electronic Tests

    Section 7 Electronic Tests The Electronic Tests verify the calibration and operation of the electronic circuits within the Model 2001 Pulse Oximeter. These tests do NOT need to be performed on a regular (preventative maintenance) basis. Perform these tests only if the monitor fails to operate as expected or fails the Functional Tests or the Accuracy Tests.
  • Page 36 Section 7 Electronic Tests Procedure Attach line cord and set rear panel Mains switch to “|”. Verify that the green LED on the front panel illuminates. The monitor may power up when the Mains switch is set to“|”, if this occurs turn the monitor off with the front panel button.
  • Page 37 Section 7 Procedure Electronic Tests Short out capacitor C90 by installing a jumper wire from R59 to R56 as shown. Connect the RS232 test fixture to J101 and the saturation test jack to the saturation input connector. Run monitor test 1. Press the Test softkey, “Automatic Test” will appear. Press the Test softkey again to initiate the test, Follow the prompts in each test and verify each test passes.
  • Page 38 Section 7 Electronic Tests Procedure RED ADC 5B32-88CB hex IR ADC 3324-4CB7 hex Press Quit followed by Yes. Verify a “Monitor performing self test” message is displayed then is immediately followed by the main monitoring screen. Press and hold the Contrast key. Verify the display contrast changes from light to dark. Set the contrast to a normal level.

  • Page 39: Safety Testing

    Section 7 Safety Testing Electronic Tests Release the Infrared Open button. Verify the error message clears and a saturation and pulse value are displayed. Disconnect the TB500B from the saturation input connector. Verify a “Connect SPO2 Sensor” message is displayed. Connect the current limit test fixture to the saturation input connector.
  • Page 40 Section 7 Electronic Tests Safety Testing [This page intentionally blank.] Model 2001 Service Manual Rev. 01...

  • Page 41: Maintenance

    Section 8 Maintenance General This section presents recommended maintenance schedules for the Model 2001 and information on general maintenance, such as battery and fuse replacement, disassembly and assembly instructions, and system software updates. Maintenance Schedules The electronic circuits within the Model 2001 Pulse Oximeter monitor do not require scheduled calibration or service.

  • Page 42: Model 2001 Monitor

    Section 8 Maintenance Cleaning and Sterilization Model 2001 Monitor • Turn the monitor off and unplug the line cord from the AC power source before cleaning. • The monitor can be cleaned and disinfected with solutions such as a 70% isopropyl alcohol, 2% gluteraldehyde, or 10% bleach solution.

  • Page 43: Battery Life And Maintenance

    Section 8 Battery Life and Maintenance Maintenance Battery Life and Maintenance The monitor was shipped from the factory with a fully charged battery. Since the monitor draws some battery power even while turned off, it is recommended that the monitor be operated on line power for the first 24 hours to allow ample time for the battery to fully recharge.

  • Page 44: Changing The Mains Voltage Setting

    Section 8 Maintenance Mains Voltage Configuration Pry the fuse housing out from the power entry module. Fuse housing NOTE: 5 mm X 20 mm fuses are installed toward the “back” of the fuse housing as shown 3AG type 5 X 20mm type Replace the blown fuse(s) with the proper type and rating.
  • Page 45 Section 8 Mains Voltage Configuration Maintenance Using a flat blade screwdriver, pry the fuse access door open to expose the fuse housing. Pry the fuse housing out from the power entry module. Fuse housing Fuse access door Install the proper type and rating fuse for the mains voltage setting required. Position the housing into the power entry module so that the desired voltage is furthest away from the switch (see below).

  • Page 46: Assembly Exchanges

    Section 8 Maintenance Assembly Exchanges Assembly Exchanges The disassembly instructions below are intended as a guide to enable component exchanges if necessary. There are no serviceable parts inside. Disassembly should be performed by qualified service personnel only. Ensure the monitor is Off. Disconnect the line cord and sensor. Remove the four cover screws from the bottom cover.
  • Page 47 Section 8 Assembly Exchanges Maintenance Unplug P102 (1) The Power Supply connector from the 2775 Main Board, disconnect P109 (2) Speaker, P108 (3) Sensor, P104 (4) Keypanel, P106 (5) Backlight, P105 (6) Alert Bar, and P107 (7) Display. Unscrew 2775 Main Board from the rear panel. Remove the front Bezel assembly then slide the Main Board out, the 2472 Power Supply Board and Battery should be exposed.

  • Page 48: Changing System Software

    Section 8 Maintenance Changing System Software Changing System Software The system software is contained in EPROM IC17 on the 2775 Main Board. New software releases are made available from time-to-time. These new releases may add features or be maintenance upgrades. To install a new EPROM: Assembly Exchanges Follow the steps listed in on page 40 to open the monitor.

  • Page 49: Troubleshooting

    Section 9 Troubleshooting Fault, alert and error messages that can appear on the Model 2001 Message Center display are described below. Fault and Error Condition Messages SENSOR OFF PATIENT Sensor disconnected from patient, improperly applied, or placed on an area too translucent for proper sensor operation. Reposition sensor.

  • Page 50: Miscellaneous Messages

    Section 9 Troubleshooting Miscellaneous Messages AUDIO OFF DISABLED Displayed if user tries to enable Audio Off mode (by pressing and holding the AUDIO key) while the “Allow Audio Off” portion of the Options Menu is set to “No”. BATTERY VERY LOW 1.

  • Page 51: Specifications

    Section 10 Specifications General Specifications for the Novametrix Model 2001 Pulse Oximeter, are listed for informational purposes only, and are subject to change without notice. Oxygen Saturation (SpO ) Section • Range: 0-100% Accuracy: 70-100% ± 2% (1 standard deviation), 0-69% unspecified •...

  • Page 52: General Specifications

    Section 10 Specifications General Specifications General Specifications • Operating Conditions: 50-104° F (10-40 °C), 0-90% relative humidity, non-condensing • Transport/Storage Conditions: -10 to +55°C (14-131°F), 10-95% relative humidity, non-condensing • Weight: 7 lbs 5 oz. (3.32 kg) • Dimensions: Height, 3.3 inches (8.38 cm) Width, 9 inches (22.86 cm) Depth, 8 inches (20.32 cm) •...

  • Page 53: Accessories

    Section 11 Accessories Model 2001 Pulse Oximeter Catalog No. Description 9400-00 Model 2001 Pulse Oximeter, with choice of sensor OxySnap™ SpO S E NS O R S a n d CA BL ES 8793-00 OxySnap™ Y-Sensor™ (use with OxySnap™ Extension Cable) 8744-00 OxySnap™...
  • Page 54 Section 11 Accessories Model 2001 Pulse Oximeter Catalog No. Description SE N S OR MA NAGEME N T PL AN S Select a Finger Sensor or Y-Sensor™ Management Plan for each SuperBright™ Pulse Oximeter. The plan you select determines the length of coverage—36 or 60 months. How the Plans Work: Included in each Plan are TWO sensors—one for immediate use, the other one for back-up.
  • Page 55 Section 11 Model 2001 Pulse Oximeter Accessories Catalog No. Description 9085-00 Cable to Seiko DPU-414 Printer, 9 to 25 pin, (Model 515A/520A/ 860/1265/7100/2001) 300017 Seiko DPU-414 Thermal Printer Paper (2 rolls per box) 400051 Seiko battery pack 400052 AC Adapter, 120 VAC 400053 AC Adapter, 100 VAC 400054 AC Adapter, 230 VAC ACC E S S O RI E S...
  • Page 56 Section 11 Accessories Model 2001 Pulse Oximeter Catalog No. Description 140100 Swivel C-Clamp Hanger 140098 Rollstand, includes base, casters, tilt, swivel head, post, poll handle, utility basket. Requires either 140095 or 140101 Mounting Plate Kit. EX T EN DE D WAR RAN T Y Normal warranty: Monitor—1 year, Finger Sensor—6 months 9400-81 Model 2001 Pulse Oximeter - warranty extended an additional 1 year (Total Warranty: Monitor—2 years)

  • Page 57: Parts Lists

    Section 12 Parts Lists 9400-00 PULSE OXIMETER, 2001 Item Nbr Description 286205 6-32 X 3/4 S.B.H. CAD PLA 315032 LABEL, 120VAC 600026 LINE CORD, AC, 7 1/2 FT, 1003-32 LABEL, SERIAL NUMBER 1217-32 REPAIR LABEL 4470-32 LABEL, CAUTION GROUNDING 6642-32 INSTRUCTION SHEET, BATTERY 6965-32 REGULATORY LABEL, UL MARK...
  • Page 58 Section 12 Parts Lists 9629-01TOP COVER ASSY, 2001 Item Nbr Description 5828-32 ISOLATION LABEL, 520A, 12 5862-10 SHIELD, MYLAR, TOP COVER, 6427-32 WARNING LABEL, EXPLOSION 6867-13 TOP COVER 9629-32 INSTRUCTION LABEL 160044 ALCOHOL, ISOPROPYL, TECHN 161100 TAPE, FOAM, 3/4W X .312T, 9630-01BOTTOM COVER ASSY, 2001 Item Nbr Description...
  • Page 59 Section 12 Parts Lists Item Nbr Description 6549-01 GROUND WIRE ASSY 9386-17 REAR PANEL SUBASSY 9387-01 PWR CABLE ASSY 161008 ADHESIVE 161092 ADHESIVE 210149 POWER ENTRY MODULE 216059 CONNECTOR, PLUG 280188 STANDOFF, 3/8 DIA 281500 NUT, HEX, NO. 4-40 281501 NUT, HEX, NO.
  • Page 60 Section 12 Parts Lists Itern Nbr Description 481501 DIODE, 1N4148, SIGNAL 472274 RESISTOR, 26.7 OHM, 1/4W 472105 RESISTOR, 3.92K OHM, 1/4W 470109 RESISTOR, 470K OHM, 1/2W 481534 DIODE, BAT82, SCHOTTKY 2471-28 MAIN BD KIT, 520A, 2001 472227 RESISTOR, 47 OHM, 1/4W 474134 RESISTOR PACK, 41K OHM 5712-10...
  • Page 61 Section 12 Parts Lists Itern Nbr Description 5715A-07 PROGRAM, SPO2 211237 CONNECTOR, 2 PIN, HDR 486845 IC, 2.5V OR 3.0V V REF 2755-01 TONE GEN REPL BOARD ASSY 2775-02 FAB, MAIN BD, 520A & 2001 161039 FOAM TAPE, 1/32THK X 2 280023 SPACER HEX *4-40 X 3/B LG 284217...
  • Page 62 Section 12 Parts Lists 2471-28 MAIN BD KIT Item Nbr Description 180012 FERRITE BEAD 484535 VOLTAGE REGULATOR 486295 IC, MM74HC4O51N 484534 VOLTAGE REGULATOR 486625 MC74HC32N I.C. 211414 CONNECTOR, 4 PIN 152085 CAPACITOR, 1500UF 515511 FUSEHOLDER, VERT 484533 VOLTAGE RGLTR 484523 VOLTAGE REGULATOR 484529 VOLTAGE REGULATOR...
  • Page 63 Section 12 Parts Lists Item Nbr Description 154057 CAPACITOR, 470pF 485527 MOSFET, 1RF9523 211412 CONNECTOR, 4 PIN 484014 NPN TRANSISTOR 486276 IC, LT1O81CN 180004 CHOKE, 100UH, 10%, 215031 SOCKET, 20 PIN, DIP, 211213 CONNECTOR, 2 PIN 211629 CONNECTOR, 6 PIN 470111 RESISTOR, .33 OHM 153046...
  • Page 64 Section 12 Parts Lists Item Nbr Description 600034 RIBBON CABLE ASS?, 4 474181 RESISTOR, 4.3 OHM, 1 474166 RESISTOR, lOOK OHM, 474216 RESISTOR, 4.99K OHM, 485543 TRANSISTOR, MOSFET, 2726-03 SCHEMATIC, POWER SUP 211213 CONNECTOR, 2 PIN, HE 481552 DIODE, MBRS34OT3, SC 154072 CAPACITOR, .1UF, 50V 474151...
  • Page 65 Section 12 Parts Lists Item Nbr Description 486317 IC, MC74HC00AD 486321 IC, SN74HCl38D 486323 IC, SN74HC573DW 486783 IC, TL034ACD 5963-00 ANALOG MODULE Item Nbr Description 2485-01 ANALOG MODULE BOARD ASSEMBLY 5895-13 HOUSING, PAINTING & SHIELD 5970-07 PROGRAM, EPROM ASSY 5982-10 BACKPLATE, ANALOG MODULE 161059 TAPE, FOAM, POLYETHYLENE,...
  • Page 66 Section 12 Parts Lists Model 2001 Service Manual Rev. 01...

  • Page 67: Schematic And Assembly Drawings

    Section 13 Schematic and Assembly Drawings Drawing Description 9400-09 Overall Wiring Diagram 9400-00 Main Assy, Model 2001 9400-01 Oximeter Unit Assy 2726-01 PSU Board Assy 2726-03 PSU Board Schematic 2775A-01 Main Board Assy 2775A-03 Main Board Schematic 2776-01 DSP Board Assy 2776-03 DSP Board Schematic 2473-03...

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