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Novametrix Medical Systems OXYPLETH 520A Service Manual

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PRELIMINARY
OXYPLETH
®
Service Manual
Pulse Oximeter
Model 520A
June 5, 2001
Catalog Number 5693-90-01
Novametrix Medical Systems Inc. Wallingford, Connecticut, U.S.A. 06492.
Copyright 1992-2001. 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 520A June 5, 2001 Catalog Number 5693-90-01 Novametrix Medical Systems Inc. Wallingford, Connecticut, U.S.A. 06492. Copyright 1992-2001. All rights reserved. No part of this manual may be reproduced without the written permission of Novametrix Medical Systems Inc.
  • Page 2 Copyright© 1992-2001 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 3 Manufacturing, Quality and Safety Novametrix manufacturing facility is certified to ISO 9001 and EN46001 (MDD93/ 42/EEC Annex II). Novametrix Medical Systems Inc. products bear the “CE 0086” mark. The product is certified by Underwriter’s Laboratories (UL) to bear the UL mark;...

  • Page 4: Table Of Contents

    PRELIMINARY Contents Contents ....................iii List of Figures ..................vii List of Tables..................viii Introduction ................... 1 Purpose ....................1 Technology Description ................. 1 Conventions Used In This Manual............2 Acknowledgments ................. 2 Patient Safety ..................3 Warnings....................4 Cautions....................5 Front Panel ....................

  • Page 5: Contents

    Contents PRELIMINARY Low Battery Voltage Shutdown............21 Timing Sequencer................22 Data Sampling Controller............... 22 Sensor LED Drive Circuits ............. 23 Sensor Photodiode Return Path ............ 24 Calibrating the 20-Bit Analog-to-Digital Convertors ....... 25 20-Bit Analog-to-Digital Conversion..........26 Sensor Status Decoding and Conversion........26 Sensor Status Parameters.............
  • Page 6 Contents Section PRELIMINARY Accuracy Test ..................55 Introduction ..................55 Monitor Accuracy Test ................. 55 Calibration Tests................. 59 Introduction ..................59 Equipment Required and Test Setup ..........59 Test Procedure ..................60 Safety Testing..................63 Connecting to other Equipment ............65 Connecting the Seiko DPU-414 Thermal Printer .........
  • Page 7 Contents PRELIMINARY 2755-01 TONE GEN REPL BOARD ........... 87 2775-01 MAIN BOARD ASSY ............. 87 2471-28 MAIN BD KIT (part of 2775-01) ..........89 2471-01 MAIN BOARD ASSY ............. 91 Schematic and Assembly Drawings ..........93 Notes ....................95 5-Jun-01 Model 520A Service Manual...

  • Page 8: List Of Figures

    PRELIMINARY List of Figures Figure 1. Front Panel Description ..............6 Figure 2. Rear and Top Panel Descriptions............ 7 Figure 3. Figure 1. Front-End Timing............23 Figure 4. Power Entry Fuse Access Door Opening ........40 Figure 5. Fuse Removal................40 Figure 6.
  • Page 9 PRELIMINARY List of Tables Table 1. Display Command/Data table............30 Table 2. CSI/O Decode Lines ..............32 Table 3. SpO2 Display tolerances for TB500B settings....... 57 Table 4. Analog Output Module Voltage Tolerances ........71 Table 5. Schematic and Assembly Drawings ..........93 viii 5-Jun-01 Model 520A Service Manual...
  • Page 10 List of Tables Section PRELIMINARY Model 520A Service Manual 5693-90-01...

  • Page 11: Introduction

    PRELIMINARY Introduction Purpose This manual has been prepared for technicians servicing the Novametrix Model 520A Pulse Oximeter monitor. It presents technical information relating to the monitor’s theory of operation, maintenance, calibration and repair. Refer to the Pulse Oximeter Model 520A User’s Manual (Catalog Number 5693-23) for additional information.

  • Page 12: Conventions Used In This Manual

    Introduction Section 1 PRELIMINARY Pulse Rate is calculated by measuring the time interval between detected peaks of the infrared light waveform. The inverse of this measurement is displayed as pulse rate. The oxygen saturation and pulse rate values are displayed on monitor’s displays. The displayed values are updated once each second.

  • Page 13: Patient Safety

    PRELIMINARY Patient Safety The OXYPLETH Pulse Oximeter Monitor, Model 520A, SpO Input is electrically isolated. Patient leakage current flowing from the instrument to ground is limited to less than 10 µA at 120 VAC, 60 Hz. Patient isolation is greater than 10 MΩ, 2500 VAC rms at 60 Hz.

  • Page 14: Warnings

    PRELIMINARY Warnings WARNING Indicates a potentially harmful condition that can lead to personal injury • Explosion Hazard: Do NOT use OXYPLETH in the presence of flammable anesthetics. Use of this instrument in such an environment may present an explosion hazard. •...

  • Page 15: Cautions

    PRELIMINARY Cautions CAUTION Indicates a condition that may lead to equipment damage or malfunction. • Do not operate OXYPLETH when it is wet due to spills or condensation. • Do not operate OXYPLETH if it appears to have been dropped or damaged. •...

  • Page 16: Front Panel

    PRELIMINARY Front Panel Saturation% Display Area; Audio key; Press and release 13. Power key; Press POWER to turn and alert limit settings are AUDIO to turn on/off the two the monitor off and on. displayed here. minute silence function. Press and 14.

  • Page 17: Rear & Top Panels

    PRELIMINARY Rear & Top Panels Line Cord Clip; This clip can be AC Mains Power Switch; With pin “D” connector serves as the set around the line cord strain switch in “O” position, AC Mains interface connector. relief so that the cord cannot be voltage does not enter monitor.

  • Page 18: Summary Of Operation

    PRELIMINARY Summary of Operation This section summarizes the operation of the Model 520A Pulse Oximeter. It is intended as a quick reference and refresher for persons who have thoroughly reviewed the Model 520A User’s Manual (PN: 5693-23). Persons unfamiliar with the Model 520A should thoroughly examine the User’s Manual before referencing the steps listed here.

  • Page 19: Menu Trees

    PRELIMINARY Menu Trees menus are described on the following pages. OXYPLETH 5-Jun-01 Model 520A Service Manual...

  • Page 25: Electronic Theory Of Operation

    PRELIMINARY Electronic Theory of Operation The electronic theory of operation of the Model 520A Pulse Oximeter monitor is detailed in the subsections below. Refer to Section 19, Schematic and Assembly Drawings, on page 93 for further information. 2472 Power Supply Board The 2472 Power Supply Board contains the circuitry needed to power the monitor from the AC Mains (line voltage).

  • Page 26: Ac Mains Operation

    Electronic Theory of Operation Section 9 PRELIMINARY the AC Mains must be connected and the front panel key pressed before the POWER monitor will turn back on. AC Mains Operation 9.1.2 The AC Mains voltage enters the monitor at the rear panel Power Entry Module (PEM).

  • Page 27: 2726 Power Supply Board

    2726 Power Supply Board PRELIMINARY (VBAT-). The battery power will conduct through D3 and F301 to VIN at E302 pin 1 to the 2471 main board. The arrangement of R1, R2 and D2 bias Q1 off in this condition which prevents power from reaching IC1, IC2 and IC3. The output of IC1 is also protected by D5 which is now reverse biased, the bridge D1 is also reverse biased and prevents T301 from discharging the battery.

  • Page 28: Battery Operation

    Electronic Theory of Operation Section 9 PRELIMINARY The filtered, switched and fused output of the Power Entry Module is fed to the primary coils of the rear panel mounted system transformer, T301. The secondary output from T301 is rectified by D1 (bridge rectifier) and filtered by C1. The loaded DC voltage at this point is approximately 20 volts.

  • Page 29: 2471 & 2775 Main Board

    2471 & 2775 Main Board PRELIMINARY 2471 & 2775 Main Board The Main Board contains all the analog and digital circuitry that controls the sensor, external communication and front panel display. The isolated power supplies, microprocessor circuits and memory are all contained on this board. The earlier 2471 Main Board and newer 2775 Main Board are identical with exceptions noted in the text.

  • Page 30: Power Supplies

    Electronic Theory of Operation Section 9 PRELIMINARY effect of synchronizing the output of the pulse width modulator with the data sampling operations of the analog board and keeps power supply switching spikes from interfering with those operations. Power Supplies 9.3.2 The secondary pins 7, 8, 9 of T1 form a center tap transformer, the voltage is rectified by D2 and D4 then filtered by C10, C11, C12 and C13.

  • Page 31: Preserving Ram And Real Time Clock Data

    2471 & 2775 Main Board PRELIMINARY The +2.5 volt output from IC35 pin 6 is fed to the non-inverting input of amplifier IC36 pin 3. Resistors R32 and R33 combine for a gain of 1.617 that provides a +4.096 volt reference (approximately) supply, 4VREF, at IC31 pin 1. The 4VREF is fed to IC30 pin 13 which is set up as a unity gain inverting buffer amplifier, therefore the output at IC30 pin 14 is -4 volts.

  • Page 32: Timing Sequencer

    Electronic Theory of Operation Section 9 PRELIMINARY When IC9 shuts down, its VREF output at pin 8 is pulled Low. This forward biases D6 and causes the NAND gate output at IC11 pin4 to go High. The #2 flip-flop of IC10 is clocked, and the High at the D2 input (because /Q1 is High) is transferred to the Q2 output at pin 13.

  • Page 33: Sensor Led Drive Circuits

    2471 & 2775 Main Board PRELIMINARY low, during a Probe Off Patient alert, and during a system power up self-test. See Calibrating the 20-Bit Analog-to-Digital Convertors on page 25. Figure 3. Figure 1. Front-End Timing The data sampling sequence consists of: a.

  • Page 34: Sensor Photodiode Return Path

    Electronic Theory of Operation Section 9 PRELIMINARY D0-D7 (IC30 pins 14-7) now control the output voltage of IC30 pin 8 (VLED) based on the VREFB voltage on IC29 pin 18. When the RDLED* signal at IC42 pin 18 goes low (logic 0), Q14 turns off and the Red LED signal (VLED from IC30 pin 8) at R37 is divided by R37 and R41, finally causing IC36 pin8 to go high.

  • Page 35: Calibrating The 20-Bit Analog-To-Digital Convertors

    2471 & 2775 Main Board PRELIMINARY C100 (that maintains the signal until next sample pulse arrives), a gain stage, (IC38 pin 1), a filter/divider network (C87, R45 and R46), and finally, to the Red channel Analog-to-Digital Convertor (ADC) IC34. If the signal at IC40 pin 7 is the product of the Infrared LED being turned on, then ISMP* from IC42 pin 13 will go low and close the switch at IC41 pins 14-15, thereby presenting the signal to a sample and hold circuit consisting of R55 and C96 (that maintains the signal until next sample pulse arrives), a gain stage, (IC38 pin...

  • Page 36: 20-Bit Analog-To-Digital Conversion

    Electronic Theory of Operation Section 9 PRELIMINARY 20-Bit Analog-to-Digital Conversion 9.3.11 Data from the Red and Infrared channels is sampled by the 20-bit measurement ADCs, IC34 and IC37 respectively. The analog input at pin 9 is converted to a digital representation with 20-bit resolution based on the input magnitude. The CS5503 convertor continuously samples its input, converts the value to a digital word, puts the word in its output buffer (overwriting previous buffer contents), then repeats the process by again sampling its input.

  • Page 37: Sensor Status Parameters

    2471 & 2775 Main Board PRELIMINARY remaining bits (D6-D0) are shifted out on subsequent falling edges of the CLK input. On the clock pulse following the one that shifts out the least significant bit (D0), the CLK and DOUT lines are returned to 3-state and the ADC performs a new conversion based on the input it receives from the IC33 channel selected by the A0AUX-A2AUX input address lines.

  • Page 38: Microprocessor

    Electronic Theory of Operation Section 9 PRELIMINARY the cumulative effect of the -5 volts and the negative photodiode signal passing through D14 and R34 would be to send the IC36 pin7 output to its positive rail (+12 volts). The processor recognizes this higher voltage and causes an INCOMPATIBLE message to displayed in the Message Center.

  • Page 39: Real Time Clock (Rtc)

    2471 & 2775 Main Board PRELIMINARY The ROM at IC17 is read when its Chip Enable line (IC17 pin 22) is brought low by the ROMCS* signal at IC25 pin 3, and the processor brings its Read line (IC16 pin 63) low—thereby activating the ROM Output Enable line at IC17 pin 24. Under these conditions, ROM data from the specified address bus location is made available to the data bus for use by the processor.

  • Page 40: Keypanel Interface

    Electronic Theory of Operation Section 9 PRELIMINARY Keypanel Interface 9.3.18 The12 keys (switches) on the Model 520A front panel are connected to the 2471 Main Board through a ribbon cable at J104. Each key (except ) is connected POWER to an 8-bit latch (either IC14 or IC15). When any of these keys is pressed, the corresponding latch input is brought low.

  • Page 41: I/O Device Controller

    2471 & 2775 Main Board PRELIMINARY The backlight for the display is controlled by the DSPBR (Display Bright) line. When DSPBR is high the gate of Q16 is biased off, current flows from Vcc through R51 to IC45. This sets the backlight for low illumination. The illumination of the backlight is made greater when DSPBR is made low, this biases Q16 on which essentially shorts out R51 allowing more current to flow into IC45 creating a full backlight.

  • Page 42: Serial I/O Controller

    Electronic Theory of Operation Section 9 PRELIMINARY If the WDOG pulse does not appear at regular intervals, as the result of a software or hardware problem, the RC charges up and IC21 pin 8 goes low producing a Watchdog Time-out (WDTO*) input at IC18 pin 11. WDTO* combines with other signals within the PEEL and causes the open drain Master Reset (MR) output at IC18 pin 13 to be brought low.

  • Page 43: Rs232 Serial Communication

    2471 & 2775 Main Board PRELIMINARY After receiving the correct number of bits for the ADC being read, the CPU changes the AA1 and AA0 decode lines and exerts the Next line (NEXT*) at IC18 pin 9 low. This restarts the serial data shifting out of the newly selected ADC. After all three ADCs have been read, the CPU sets the AA1 and AA0 decode lines to exert the internal TEND signal and set the 8-bit ADC to the next channel (so that it has time to settle before the next read of the ADC).
  • Page 44 Electronic Theory of Operation Section 9 PRELIMINARY The transmit signal TX1, is dedicated to communication with the Optional Analog Module (Catalog Number 9622-01) which when connected to the rear panel connector, provides analog representations of the SpO and Pulse Rate values, a plethysmogram signal, and a pass through port for the RS232 connector.

  • Page 45: Maintenance

    PRELIMINARY Maintenance General 10.1 This section presents recommended maintenance schedules for the Model 520A and information on general maintenance, such as battery and fuse replacement, disassembly and assembly instructions, and system software updates. Maintenance Schedules 10.2 The electronic circuits within the Novametrix Model 520A Pulse Oximeter monitor do not require scheduled calibration or service.

  • Page 46: Cleaning And Sterilization

    Maintenance Section 10 PRELIMINARY Cleaning and Sterilization 10.3 Model 520A Monitor 10.3.1 • Turn the monitor off and unplug from the AC (Mains) line before cleaning. • The monitor can be cleaned and disinfected with solutions such as a 70% isopropyl alcohol, 2% glutheralhyde, or 10% bleach solution.

  • Page 47: Battery Life And Maintenance

    Battery Life and Maintenance PRELIMINARY Battery Life and Maintenance 10.4 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 48: Changing The Mains Voltage Setting

    Maintenance Section 10 PRELIMINARY Power entry module Fuse housing Fuse access door 4. 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 5.

  • Page 49: Ac Mains On Older Style Assemblies

    Mains Voltage Configuration PRELIMINARY 200-240 VAC 250mA 250V 3. 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 4.

  • Page 50: Replacing The Ac Mains Fuse(S)

    Maintenance Section 10 PRELIMINARY Replacing the AC Mains Fuse(s) 10.5.4 1. Turn off the Model 520A. Set the rear panel AC Mains power switch to “0” and disconnect the line cord from the monitor. 2. Place a screwdriver into the Fuse Access Slot and pry open the Fuse Access Door.

  • Page 51: Assembly Exchanges

    Assembly Exchanges PRELIMINARY 3. Using needle-nosed pliers, pull the Voltage Selector Drum from the PEM. Note the orientation of the drum; the proper voltage should face out. Voltage Selector Drum Figure 6. Power Entry Module Voltage Selector Drum Removal 4. Set the Voltage Selector Drum so that the printed side of the correct voltage faces you.

  • Page 52: Figure 8. Removing The Top Cover

    Maintenance Section 10 PRELIMINARY 1. Turn the Model 520A Off. Disconnect the line cord and sensor. Remove the four cover screws from the bottom cover. Holding both case halves together, flip the monitor right-side up. Remove Line Cord Remove these (4) four screws.

  • Page 53: Figure 10. 520A Assembly With 2471 Main Board Removed

    Assembly Exchanges PRELIMINARY Board from the rear panel. Remove the front Bezel assembly then slide the 2471 Main Board out, the 2472 Power Supply Board and Battery should be exposed. 4. The separate sections of the monitor can now be removed. 2472 Power Supply Board Battery Connection to Power...

  • Page 54: Changing System Software

    Maintenance Section 10 PRELIMINARY Changing System Software 10.7 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: 1.

  • Page 55: Figure 11. Changing The System Software Eprom

    Changing System Software PRELIMINARY 2. Use a small flat-blade screwdriver (or IC extraction tool) to pry the EPROM IC17 from the socket—be careful not to bend the pins. IC17 System Software Pin 1 orientation Figure 11. Changing the System Software EPROM 3.
  • Page 56 Maintenance Section 10 PRELIMINARY [This page intentionally blank] Model 520A Service Manual 5693-90-01...

  • Page 57: Troubleshooting

    PRELIMINARY Troubleshooting Fault, alert and error messages that can appear on the Model 520A Message Center display are described below. Paragraphs marked with a “ ” are intended for qualified service personnel only. Message Center Display Possible Explanation Displayed if user tries to enable Audio Off mode (by press- ing and holding the AUDIO key) while the “Allow Audio AUDIO OFF DISABLED Off”...
  • Page 58 Troubleshooting Section 11 PRELIMINARY Message Center Display Possible Explanation A non-SuperBright™ sensor is connected, use only 87xx series sensors. INCOMPATIBLE PROBE Sensor is faulty. Remove sensor from use and contact quali- fied service personnel. Insufficient Light, where ** is time in seconds (after 99 sec- onds display shows “--”).
  • Page 59 PRELIMINARY Message Center Display Possible Explanation Sensor faulty. Remove sensor from use and contact qualified service personnel. PROBE FAULTY RD Sensor Red LED has failed or the cable connections are open or shorted. Sensor faulty. Remove sensor from use and contact qualified service personnel.
  • Page 60 Troubleshooting Section 11 PRELIMINARY [This page intentionally blank] Model 520A Service Manual 5693-90-01...

  • Page 61: Functional Test

    PRELIMINARY Functional Test Introduction 12.1 The 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. This procedure assumes the technician performs each step as indicated - leaving the monitor in a known state prior to performing the next step.
  • Page 62 Functional Test Section 12 PRELIMINARY • Briefly display Parameters Reset To Factory Default • Briefly display MONITOR PERFORMING SELF TEST. • The message center will display for ap- ERASE STORED TRENDS ? proximately 10 seconds. Verify the Message Center flashes while no sen- 12.2.9 CONNECT SPO2 PROBE...

  • Page 63: Special Power Up Functions

    Special Power Up Functions PRELIMINARY Press and release the key. The (Two Minute Silence) indicator 12.2.19 AUDIO should illuminate and the alarm should be silenced. After two minutes the indicator turns off and the alarm sounds again (providing the alarm condi- tion still exists).

  • Page 64: Figure 12. Softkey Identification

    Functional Test Section 12 PRELIMINARY normal power up sequence. Note that the system date and time are not af- fected by this action. Softkey #1 Softkey #2 Figure 12. Softkey Identification = EPROM Checksum Test, Production Test Mode Softkey #1 Turn the monitor on while holding (the leftmost softkey) and Softkey #1...

  • Page 65: Accuracy Test

    PRELIMINARY Accuracy Test Introduction 13.1 The Accuracy Test verifies the performance accuracy of the Model 520A Pulse Oximeter monitor. If the monitor does not pass the accuracy test, the monitor should be recalibrated. Refer to Section 14, Calibration Tests, on page 59, or contact the Novametrix Service Department for repair/replacement assistance.
  • Page 66 Accuracy Test Section 13 PRELIMINARY Set the TB500B to these settings; 13.2.4 Power - On, Sensor Type - 87xx, Signal Attenuation - 3, Saturation - 92. Connect the TB500B to the Model 520A SpO Input Connector. 13.2.5 Verify a Pulse Activity Bar appears in the Message Center. Verify SpO and Pulse Rate values appear after several “pulses”.

  • Page 67: Table 3. Spo2 Display Tolerances For Tb500B Settings

    Monitor Accuracy Test PRELIMINARY messages will be generated and displayed as the saturation value violates the alert limit settings.) TB500B 520A 520A SpO SAT ATTEN SpO (w/ TB500A) 99 ± 1 99 ± 1 92 ± 2 92 ± 2 82 ±...
  • Page 68 Accuracy Test Section 13 PRELIMINARY [This page intentionally blank] Model 520A Service Manual 5693-90-01...

  • Page 69: Calibration Tests

    PRELIMINARY Calibration Tests Introduction 14.1 The Calibration Tests verify the calibration and operation of the electronic circuits within the Model 520A 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 and/or fails the Functional Test on page 51 and/ or the Accuracy Test on page 55.

  • Page 70: Test Procedure

    Calibration Tests Section 14 PRELIMINARY Flip the monitor over to expose the bottom cover and remove the four 14.2.3 cover screws. Holding both the top and bottom halves together, flip the monitor over again and set it on its bottom cover. Lift the top cover from the monitor and set it aside.
  • Page 71 Test Procedure PRELIMINARY Short out capacitor C90 by installing a jumper wire from R59 to R56. 14.3.6 Back of Unit 2471 / 2775 Bd Component Side Front of Unit Connect the RS232 test fixture to J101 and the saturation test jack to the 14.3.7 saturation input connector.
  • Page 72 Calibration Tests Section 14 PRELIMINARY Using the Next softkey increment to monitor test 12 (Display ADC 14.3.11 channels). Press the Test softkey, will appear. Display ADC channels Press the Test softkey to initiate the test. Press the Prev softkey. Verify the LED pwr=20.

  • Page 73: Safety Testing

    Safety Testing PRELIMINARY Set the TB500B Saturation to “0”. Verify a 14.3.20 Low Signal Strength message is displayed. Set the TB500B Saturation to “100”. Verify the error message clears and 14.3.21 a saturation and pulse value are displayed. Press the TB500B Red Open button. Verify a message is 14.3.22 Probe Faulty...
  • Page 74 Calibration Tests Section 14 PRELIMINARY [This page intentionally blank] Model 520A Service Manual 5693-90-01...

  • Page 75: Connecting To Other Equipment

    PRELIMINARY Connecting to other Equipment The Model 520A Pulse Oximeter communicates with external equipment via its rear panel (25 pin D style female) connector. The monitor can be connected to RS232 compatible (digital) equipment. If the optional Analog Output Module is connected, the monitor can output to analog devices such as strip chart recorders.
  • Page 76 Connecting to other Equipment Section 15 PRELIMINARY 2. “DIP SW-1” will print. Enter the new settings for switches 1-8. “ON” is set by pushing the ON LINE button once “OFF” is set by pushing the FEED button once The printer will confirm each selection. Repeat for DIP SW 2 and 3. The DIP switch settings for the Model 520A are as follows: [ DIP SW settings mode ] Dip SW-1...

  • Page 77: Connecting The Thinkjet Printer

    Connecting the ThinkJet Printer PRELIMINARY Connecting the ThinkJet Printer 15.2 To connect the Hewlett-Packard ThinkJet Printer to the Model 520A: 1. The Hewlett-Packard ThinkJet must be a Model 2225D (RS-232C interface). 2. Set the dip switches on the rear panel of the ThinkJet. Mode switches = 1, 2, 5, 6 up (on) and 3, 4, 7, 8 down (off).

  • Page 78: Connecting Seiko Dpu-411 Thermal Printer

    Connecting to other Equipment Section 15 PRELIMINARY 2. Connect the printer interface cable, PN:4913-00, to the RS232C connector on the Model 520A. Connect the other end of the cable to the Model 315. DIP SWITCHES MODEL 520A REAR PANEL 1 2 3 4 5 6 7 8 MODEL 315 REAR PANEL RS232-C INTERFACE CONNECTOR...

  • Page 79: Analog Output Module

    Analog Output Module PRELIMINARY 2. Connect the printer interface cable, PN:5861-00, to the RS232C connector on the Model 520A. Connect the 25 pin connector at the other end to the 25 pin D connector on the rear panel of the DPU-411 (upper connector). Plug the cable DC power plug into the rear jack of the Model DPU-411.

  • Page 80: Analog Output Setup

    Connecting to other Equipment Section 15 PRELIMINARY Figure 17. Analog Output Module Output Module in place. The pinouts of the 9-pin analog and 25-pin RS232C connector are shown below. GNDI Pin 1 Pulse Rate, 4mV/bpm, 0-1V Pin 2-3 GNDI (Interface ground) Pin 4-5 Saturation, 10mV/%, 0-1V Pin 8-9...

  • Page 81: Figure 19. Analog Output Setup

    Analog Output Setup PRELIMINARY appears on the display. Select MONITOR OPTIONS 2 CALIBRATE menu. RECORDER Press and hold for 5 seconds while in normal running mode Figure 19. Analog Output Setup 2. The Recorder Outputs menu will be displayed. CALIBRATE RECORDER ZERO HALF FULL PREV - return to Monitoring Mode •...
  • Page 82 Connecting to other Equipment Section 15 PRELIMINARY 4. When the recorder is properly adjusted, press the key. The monitor will return to Monitoring Mode and automatically begin outputting analog data to the Analog Output Module. Note: This setup procedure does not have to be performed each time the monitor is turned on—the monitor will always automatically output analog information via the Analog Output Module, this procedure simply helps to calibrate the recorder to the Model 520A signals.

  • Page 83: Specifications

    PRELIMINARY Specifications General 16.1 Specifications for the Novametrix OXYPLETH Pulse Oximeter, Model 520A, are listed for informational purposes only, and are subject to change without notice. Oxygen Saturation (SpO ) Section 16.2 • Range, 0-100% • Accuracy, 80-100% ± 2%, 0-79% unspecified (Approximately 68% of the observations are within the accuracy claim.) •...

  • Page 84: General Specifications

    Specifications Section 16 PRELIMINARY • Alerts Continuously displayed. Menu selectable high and low limits (249-30 or Off). Visible alarm is immediate. Audible alarm occurs after 10 seconds of continuous violation of the set limit or immediately. Limit values are retained in memory when monitor is turned off, or the monitor can be set to use its default settings each time it is turned on.
  • Page 85 Additional Features PRELIMINARY • Serial (RS232) Data Output Provides RS232 data interface compatible with; Seiko DPU-414 Thermal Printer Seiko DPU-411 Thermal Printer Hewlett-Packard ThinkJet Printer Novametrix Model 315 Printer Novametrix Model 1260 Capnograph Novametrix Model 1010 Telemetry Central Station SARACAP monitor RS232 computer interface NOVACARD Memory Module NOVACOM1 Interface...

  • Page 86: Accessories

    PRELIMINARY Accessories Model 520A 17.1 Catalog No. Description SuperBright™ SpO SENSORS 8793-00 OxySnap™ Y-Sensor™ (use with OxySnap™ Extension Cable), 90 day warranty 8744-00 OxySnap™ Finger Sensor (use with OxySnap™ Extension Cable), 1 yr. warranty 8853-00 OxySnap™ Extension Cable (use with OxySnap™ sensors), 8 feet, 1 yr. warranty 8898-00 OxySnap™...
  • Page 87 Model 520A PRELIMINARY Catalog No. Description 8791-60 Y-60 Plan The Plan length is 60 months. Includes 15 boxes of any Y-Strip Taping Systems 8776-36 Finger-36 Plan The Plan length is 36 months 8776-60 Finger-60 Plan The Plan length is 60 months Y-SENSOR™...
  • Page 88 Accessories Section 17 PRELIMINARY Catalog No. Description 5334-00 Cable, Serial Output to Personal Computer (PC with 25-pin connector) 5335-00 Cable, Serial Output to Personal Computer (PC with 9-pin connector) 5726-00 Cable, Analog Output Module (9622-01) to Aequitron 9500 Series Monitor 9140-00 Thermal Printer, Seiko DPU-414 (with battery pack) 400052...
  • Page 89 Model 520A PRELIMINARY Catalog No. Description Service Test Kits include items and materials qualified service personnel may require to determine the functional integrity and/or accuracy of the system. 5777-00 Test Kit, Pulse Oximeter 9999-96 “focus” Technical Training Seminar (1 day course) For class schedules call: 1-800-243-3444 Ext.
  • Page 90 Accessories Section 17 PRELIMINARY [This page intentionally blank] Model 520A Service Manual 5693-90-01...

  • Page 91: Parts Lists

    PRELIMINARY Parts Lists Family Tree 18.1 The Model 520A diagram below shows the individual assemblies of the finished product— the 5693-00 Final Assembly. 5765 TOP COVER ASSY 2471/2775 MAIN BD ASSY 5673/6538 REAR PANEL ASS 5714 BATTERY HARNESS ASSY 2473 ALERT BD ASSY 5728 SPO2 INPUT ASSY 5720 DISPLAY ASSY 5713 SPEAKER ASSY...

  • Page 92: 6538-01 Rear Panel Assy

    Parts Lists Section 18 PRELIMINARY Item Nbr Description 5766-01 BOTTOM COVER ASSY 5728-01 CABLE ASSY, SPO2 IN 2471-01 MAIN BOARD ASSY, 9621-16 LENS, ALERT 286220 SCREW, 6-32 X 3/16 6538-01 REAR PANEL ASSY 5664-10 CHASSIS, MODEL 520A 286205 6-32 x 3/4 S.B.H. 5714-01 BATTERY HARNESS ASSY 284200...

  • Page 93: 2726-01 Power Supply Bd Assy

    2726-01 POWER SUPPLY BD ASSY PRELIMINARY Item Nbr Description 5673-32 REAR FACEPLATE 5743-10 POWER ENTRY MODULE 280188 STANDOFF, 3/8 DIA 5820-01 GROUND WIRE ASSY 5229-11 WIRE CLIP MOD 285013 NYL WASH, #4 NATURAL 285000 LOCK WASHER, NO. 4 216059 CONNECTOR, PLUG 161008 ADHESIVE, 242 9308-11...

  • Page 94: 2472- 01 Power Supply Board

    Parts Lists Section 18 PRELIMINARY Item Nbr Description 474151 RESISTOR, 37.4K OHM 484559 VOLT RGLR, LT1O76CT 515083 FUSE W FUSEHOLDER 2726-17 POWER SUPPLY BOARD 154079 CAP, 1OUF, 2EV, 20%, 474218 RESISTOR, 47.5K OHM 280114 SNAP RIVET, .118 152029 CAPACITOR, 220UF 20% 485532 TRANSISTOR, 2N7002T1 474211...

  • Page 95: 5719-01 Front Panel Assy

    5719-01 FRONT PANEL ASSY PRELIMINARY Item Nbr Description 211213 CONNECTOR, 2 PIN 154016 CAPACITOR, .1UF 152029 CAPACITOR, 220UF 472109 RESISTOR, 37.4K OHM 472270 RESISTOR, 1.2M OHM 5719-01 FRONT PANEL ASSY 18.7 Item Nbr Description 280033 SPACER *4 X 1/8 5720-01 DISPLAY ASSY 2473-01 ALERT BOARD ASSY...

  • Page 96: 5728-01 Cable Assy

    Parts Lists Section 18 PRELIMINARY Item Nbr Description 211215 CONNECTOR, 2 PIN 216068 TERMINAL LUG, RECEPT 608001 CABLE TIE 605162 WIRE, 22AWG, RED 5728-01 CABLE ASSY 18.12 Item Nbr Description 211704 CONNECTOR, RCPT 605063 WIRE, 26AWG, PVC INS 608005 TUBING, HEAT SHRINK 210098 CONTACT, FEMALE 605059...

  • Page 97: 2755-01 Tone Gen Repl Board

    2755-01 TONE GEN REPL BOARD PRELIMINARY Item Nbr Description 5760-16 LEFT FOOT, WHITE 5761-16 RIGHT FOOT, WHITE 5849-10 BRACKET, SUPPORT 5409-32 LABEL, WARNING, POLE 315052 LABEL, EARTHING SYMB 2755-01 TONE GEN REPL BOARD 18.15 Item Nbr Description 486358 IC, NC7SZ32MS, 2-IN 474241 RESISTOR, 150K OHM 486825...
  • Page 98 Parts Lists Section 18 PRELIMINARY Item Nbr Description 472021 RESISTOR, 4.75K OHM 210144 JUMPER, 2 POSITION 153003 CAPACITOR, .O1UF 472193 RESISTOR, 23.7K OHM 481541 DIODE, bOy, 1A 475034 POTENTIOMETER, 2K OHM 483002 2N3906 PNP SILICON 472058 RESISTOR, lOOK OHM 154060 CAPACITOR, .22UF, 481501 DIODE, 1N4148, SIGNAL...

  • Page 99: 2471-28 Main Bd Kit (Part Of 2775-01)

    2471-28 MAIN BD KIT (part of 2775-01) PRELIMINARY Item Nbr Description 153051 CAPACITOR, .22UF, 474135 RES PACK, 100 OHM 481031 DIODE, ZENER, BZX79- 2755-01 TONE GEN REPL BOARD 472037 RESISTOR, 13.7K OHM 284217 SCREW, 4-40 X 3/16 180067 FERRITE BEAD, 600 uH 215080 SOCKET, 32 PIN, PLCC 481050...
  • Page 100 Parts Lists Section 18 PRELIMINARY Item Nbr Description 230006 CRYSTAL,3.2768MHZ 152084 CAPACITOR, 470UF 230018 CRYSTAL, 12.288MHZ 486268 IC, DG444DJ, SPST 486305 IC, MSM6242BRS, CMOS 153013 CAPACITOR, 33PF 153013 CAPACITOR, 33PF 210097 CONNECTOR, 16 PIN 230016 CRYSTAL, 32.768K HZ 486600 IC, CD4O13B 484531 VOLTAGE REGULATOR 486285...

  • Page 101: 2471-01 Main Board Assy

    2471-01 MAIN BOARD ASSY PRELIMINARY 2471-01 MAIN BOARD ASSY 18.18 Item Nbr Description 472121 RESISTOR, 3.74K OHM 483017 TRANSISTOR, BC214C 474032 RESISTOR, 10 OHM 472041 RESISTOR, 20K OHM 472063 RESISTOR, 162K OHM 472200 RESISTOR, 5.6 OHM 487064 IC, CNY17-III, PHOTO 154058 CAPACITOR, .022UF 472011...
  • Page 102 Parts Lists Section 18 PRELIMINARY Item Nbr Description 472146 RESISTOR, 47.5K OHM 152072 CAPACITOR, 1OUF 472246 RESISTOR, 66.5K OHM 472198 RESISTOR, 3.3 OHM 6266-57 PROGRAM, DISK ASSY 474098 RESISTOR PACK, lOOK 153027 CAPACITOR, 220PF 472030 RESISTOR, 10K OHM 474133 RESISTOR PACK, 10 OHM 474086 RESISTOR PACK, 10K 5711-10...

  • Page 103: Schematic And Assembly Drawings

    PRELIMINARY Schematic and Assembly Drawings Drawing Description 5693-09 Overall Wiring Diagram 2726-01 PSU Board Assy 2726-03 PSU Board Schematic 2472-01 PSU Board Assy 2472-03 PSU Board Schematic 5693-01 Oximeter Unit Assy 2471-01 Main Board Assy 2471-03 Main Board Schematic 2775-01 Main Board Assy 2775-03 Main Board Schematic...

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