Novametrix 511 Service Manual
PRELIMINARY
Model 511
Service Manual
July 18, 1994
Part Number 6116-90-00
Novametrix Medical Systems Inc.
Wallingford, Connecticut, U.S.A. 06492.
Copyright 1994. All rights reserved. No part of
this manual may be reproduced without the written
permission of Novametrix Medical Systems Inc.
PRELIMINARY
PRELIMINARY
R
18-Jul-94 Release Version 00
Revision History
18-Jul-94 Model 511 Service Manual III
Section Revision History
PRELIMINARY
[This page intentional ly bl ank.]
IV
Model 511 Service Manual 6116-90-00
PRELIMINARY
G
Equipment manufactured or distributed by Novametrix Medical Systems Inc., is
fully guaranteed, covering materials and workmanship, for a period of one year
from the date of shipment, except for certain disposable products and products with
stated guarantees other than one year. Novametrix reserves the right to perform
guarantee service(s) at its factory, at an authorized repair station, or at the
customer’s installation.
Novametrix’ obligations under this guarantee are limited to repairs, or at
Novametrix’ option, replacement of any defective parts of our equipment, except
fuses, batteries, and calibration gasses, without charge, if said defects occur during
normal service.
Claims for damages during shipment must be filed promptly with the transportation
company. All correspondence concerning the equipment must specify both the
model name and number, and the serial number as it appears on the equipment.
Improper use, mishandling, tampering with, or operation of the equipment without
following specific operating instructions will void this guarantee and release
Novametrix from any further guarantee obligations.
Guarantee
Service Department
For factory repair service, call toll free
1-800-243-3444
In Connecticut, call Collect (203) 265-7701
Telex 956-054
Facsimile (203) 284-0753
Caution: Federal (U.S.A.) law restricts this device to sale, distribution, or use by or
on the order of a licensed medical practitioner.
Copyright 1994, 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.
18-Jul-94 Model 511 Service Manual V
Section Guarantee
PRELIMINARY
Service Policy
Novametrix Medical Systems Inc. will provide W arranty Service Support to its customers within 48
hours of receiving a telephon e request for technical su pport. This 48 hour pe riod begins once a
service request is placed through the Factory Technical Support Department in Wallingford,
Connecticut. Novametrix provides factory direct technical support to its customers through a
technical support group located in Wallingford, Connecticut and company service representatives
located throughout the United States. All Technical Support for Novametrix products is provided
“Factory Direct”.
Novametrix provides 24 hour a day technical support accessibility via telephone numbers (800) 2433444 or (203) 265-77 01 . Aft er hou rs technical support requests ( before 8:00 AM and after 5:00 PM
Eastern Time) will be responded to promptly by the Technical Support On-Call staff. It is suggested
that any person calling in for technical support have the inoperative equipment available for
preliminary troubleshooting as well as product identification. Novametrix reserves the right to repair
or replace any product found to be defecti ve during the warranty period. Repair may be pro v ided in
the form of replacement exchange parts or accessories, on-site technical repair assistance or
complete system exchanges. Repairs provided due to product abuse or misuse will be considered
“non-warranty” and invoiced at the prevailing service rate. Any replaced defective material is
expected to be return ed to Novametrix within 10 days of be ing pr ov ided in or der to avoid addit ional
charges. Exchanged material should be returned promptly and directly to Novametrix using the
return paperwork an d shipping label(s) provid ed. Transferring return materia ls to local sales or
dealer representatives does not absolve return responsibility.
Novametrix manufactures eq uipment that is generally “user serviceable” and can usually be repaired
with the replacement of a plug-in electro-mechanical assembly by the clinical end user . When repair
parts are provided, the recipi ent can call into Novametrix for on-line replacement assistance and
repair assurance. In the event a replacement part requires increased technical capability, Technical
Support may request Biomedical assistance, provide on-site technical support or complete
replacement equipment. If the customer requires the return of their original product, the exchange
material will be considered “loaner material” and exchanged again after the customer equipment is
repaired.
Novametrix promotes customer participation in warranty repairs should they become necessary. This
program allows for customer training and a smooth transition into self-maintenance after warranty,
which can provide substantial cost savings on repairs thro ughout the product’s life.
The Novametrix Technical Support Department can provide technical product support at a level
appropriate to most customers protocol and budget requirements. Please contact the Technical
Support Group at Novametrix for additional information.
Additional Novametrix Technical Support Programs
• Focus Series Technical Training Seminars
• Test Equipment and Test Kits
• Service Contract / Part Insurance Plans
• Equipment Calibration Services
• On-Site Technical Support
• 24 hr. telephone support
• “Demand Services”
Flat rate parts-exchange,
Flat rate return for repair
Time and Material,
Full warranty, discounted replacement sensors
VI
Model 511 Service Manual 6116-90-00
PRELIMINARY
C
Title Section Page
Revision History...............................................................R..................III
Guarantee......................................................................... G ..................V
Table of Contents.............................................................C.................VII
List of Figures.......................... .... ..... ...............................F..................IX
List of Tables................................................... .................T........ ..... .... .XI
Introduction................................................ ..... ..... .... ........1 ...................1
Purpose ......................................................................................... 1.1.................... 1
Technology Description ................................................................. 1.2....................1
Conventions Used In This Manual................................................. 1.3....................2
Acknowledgments.......................................................................... 1.4....................2
Patient Safety...................................................................2...................3
Warnings...........................................................................3 ...................4
Table of Contents
Cautions............................................................................ 4 ...................5
Front Panel.......................................................................5...................6
Summary of Operation....................................................6...................7
Power On/Off................................................................................. 6.1....................7
Audible Alert Enable/Disable......................................................... 6.2....................7
Battery Life..................................................................................... 6.3....................8
Electronic Theory of Operation......................................7 ................... 9
2710 Analog Board........................................................................ 7.1....................9
Power Supply.......................................................................... 7.1.1.................9
Voltage Reference .................................................................. 7.1.2...............11
Sensor LED Drive Circuits ...................................................... 7.1.3...............11
Sensor Photodiode Return Path ............................................. 7.1.4...............14
Calibrating the 20-Bit Analog-to-Digital Convertors ................ 7.1.5...............15
20-Bit Analog-to-Digital Conversion........................................ 7.1.6...............16
Sensor Status Decoding and Conversion ............................... 7.1.7...............16
Sensor Status Parameters ...................................................... 7.1.8...............17
2711 Digital Board ......................................................................... 7.2..................18
Microprocessor and Memory................................................... 7.2.1...............18
Decoding................................................................................. 7.2.2...............19
18-Jul-94 Model 511 Service Manual VII
Section Table of Contents
PRELIMINARY
Microprocessor Supervisor ..................................................... 7.2.3............... 20
Front End Timing Signals........................................................ 7.2.4 ...............21
System Output Ports............................................................... 7.2.5...............22
Serial I/O Controller................................................................. 7.2.6...............23
Display .................................................................................... 7.2.7............... 24
Maintenance.....................................................................8 .................25
General.......................................................................................... 8.1 .................. 25
Maintenance Schedules ................................................................ 8.2 ..................25
Cleaning and Sterilization.............................................................. 8.3..................26
Model 511 Monitor .................................................................. 8.3.1............... 26
Finger Sensor.......................................................................... 8.3.2...............26
Y-SENSOR™ and Y-STRIP™ Taping System....................... 8.3.3...............26
Battery Installation ......................................................................... 8.4..................26
Assembly Exchanges .................................................................... 8.5 .................. 28
Changing System Software........................................................... 8.6 .................. 30
Status Messages..............................................................9.................31
Status Messages and Fault Indicators........................................... 9.1..................31
Functional Test ................................................................10...............35
Introduction.................................................................................... 10.1................35
Monitor Functional Test ................................................................. 10.2 ................ 35
Accuracy Test ..................................................................11 ...............39
Introduction.................................................................................... 11.1................39
Monitor Accuracy Test................................................................... 11.2................ 39
Electronic Test.................................................................12 ...............43
Introduction.................................................................................... 12.1................43
Monitor Functional Test ................................................................. 12.2 ................ 43
2710 Analog Board ................................................................. 12.2.3.............44
2711 Digital Board................................................................... 12.2.7 .............44
System Check......................................................................... 12.2.13...........45
Specifications................................................................... 13 ...............49
General.......................................................................................... 13.1 ................ 49
Oxygen Saturation (SpO2)...................................................... 13.1.1.............49
Pulse Rate............................................................................... 13.1.2 .............49
General Specifications ............................................................ 13.1.3.............49
Parts Lists.........................................................................14 ...............51
Model 511 Assemblies................................................................... 14.1................51
Schematic and Assembly Drawings..............................15...............59
VIII
Model 511 Service Manual 6116-90-00
PRELIMINARY
F
Figure Description Page
Figure 1.........Front panel illustration ................................ ...................... .. ........ 6
Figure 2. ........ Revision 00 power turn on circuitry........................................... 10
Figure 3. ........ Fuse protection modification..................................................... 10
Figure 4.........Fuse protection modificati on on newer revision boards............ 11
Figure 5. ........ Revision 00 LED drive circuitry................................................. 12
Figure 6. ........ Revision 01 board drive circuitry............................................... 13
Figure 7. ........ Revision 02 LED drive circuitry................................................. 14
Figure 8.........Revision 00 PRAMCS* configuration........................................ 19
Figure 9.........Revision 00 watchdog circuitry................................................. 21
Figure 10. ......Battery orientation..................................................................... 27
List of Figures
Figure 11. ......Removing the top cover............................................................ 28
Figure 12. ...... Monito r disassembled........................... ................ ............... ..... 28
Figure 13.......Disconnecting keypanel ribbon cable. ................................ ...... 29
Figure 14.......Changing the system software EPROM................................... 30
Figure 15. ...... Statu s me s s age s an d n um e ric a l c o d es .. ................ ............... ... 31
Figure 16.......Front panel................................................................................ 35
Figure 17. ......Sensor off patient display ......................................................... 36
Figure 18. ......Applying sensor for functional test............................................ 36
Figure 19. ......Sensor off patient display ......................................................... 37
Figure 20. ......LCD display with all segments on............................................. 40
Figure 21. ...... Alert display ........... .. ................ ............... ................ ............... ... 41
Figure 22.......Application of Y-sensor and Finger sensor............................... 41
Figure 23.......Cutaway showing location of C24 on the 2710 analog board... 44
Figure 24.......Connecting external DC supply to the 2711 Digi tal Board........ 45
Figure 25.......2711 Digital board power up display . ........................................ 45
18-Jul-94 Model 511 Service Manual IX
Section List of Figures
PRELIMINARY
Figure 26.......Connecting membrane keypanel...................................... .. ...... 46
Figure 27.......Connecting external DC supply................ ................................ 46
Figure 28. ......Display at power up with all segments active ........................... 47
X
Model 511 Service Manual 6116-90-00
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T
Table Description Page
Table 1. .........2711 digital board decoding lines ............................. .. .. ............19
Table 2. .........Front end timing signals .......................................... ..................22
Table 3. .........Output port li nes ...................................... .................................23
Table 4. .........CSI/O decode lines ........................................ ...........................23
Table 5. .........Status messages ......................................... .............................32
Table 6. .........Error codes ...............................................................................32
Table 7. .........Saturati on values using sensor simulator .................................40
Table 8. .........2710 analog board voltage checks ......... ..................................44
Table 9. .........Schematic and Assembly Drawings ..........................................59
List of Tables
18-Jul-94 Model 511 Service Manual XI
Section List of Tables
PRELIMINARY
XII
Model 511 Service Manual 6116-90-00
1
Introduction
Purpose
This manual has been prepared for technicians servicing the Novametrix Model 511
Pulse Oximeter. It presents technical informa tion relating to t he monitor’s theory of
operation, maintenance, calibration and repair. Refer to the Pulse O ximeter Model
511 User’s Manual (Catalog Number 6116-23) for additional information.
Technology Description
The Model 511 measures oxygen saturation and pulse rate with sensors that contain
red and infrared light sources, called LEDs. Since oxygen saturated blood absorbs
different amounts of light at each wavelength (red a nd infrared) as compared to
unsaturated blood, the amount of light absorbed by the blood in each pulse can be
used to calculate oxygen saturation.
The light energy from red (660 nm) and infrared (940 nm) LEDs is beamed through
a sample cell—a pulsating vascular bed, the patient’s finger or toe for example. The
remaining light energy not absorbed by the sample cell reaches a light receptor,
called a photodiode, on the opposing side of the sensor. The data received at the
photodiode is sent back to the monitor where it is split into its red and infrared
components, digitized, processed by a microprocessor chip, and finally displayed
as a numerical value for oxygen saturation and a plethysmogram.
1.1
1.2
The Model 511 is calibrated to display “functional” saturation. This differs from the
“fractional” saturation value displayed by most co-oximeters. Functional saturation
represents the amount of oxyhemoglobin as a percentage of the hemoglobin that can
be oxygenated. Dysfunctional hemoglobins (COHb and METHb) are not included
in the measurement of functional saturation.
Calculating
Functional Oxygen
Saturation
Pulse Rate is calculated by measuring the time interval between the peaks of the
infrared light waveform. The inverse of this measurement is displayed as pulse rate.
The Model 511 must be used in conjunction with OxySnap SuperBright™
saturation sensors. These sensors have an 8700 series part number (e.g., 8744 or
8793).
18-Jul-94 Model 511 Service Manual 1
Functional Saturation =
100 - (COHb + METHb)
HbO
2
HbO2 = Fractional Hemoglobin
COHb = Carboxyhemoglobin
METHb = Methemoglobin
Section 1 Introduction
Conventions Used In This Manual
The following conventions will be used throughout this manual:
• Normal text will be shown in this type.
• Message Center alerts and displays will be shown
• The names of the front panel pushbuttons (keys) will be shown
in this type
.
in this type.
Acknowledgments
SuperBright, Y-STRIP and Y-SENSOR are trademarks of Novametrix Medical
Systems Inc.
1.3
1.4
2
Model 511 Service Manual 6116-90-00
2
For maximum patient and operator safety, the following are recommended;
• Failure of Operation: If the monitor fails to respond as described, do not use
it until the situation has been corrected by qualified personnel.
• Keep the Model 511 and its accessories clean.
• Do not operate the Model 511 when it is wet due to spills or condensation.
• Do not operate the Model 511 if it appears to have been dropped or damaged.
• Care should be exercised to assure continued peripheral perfusion distal to the
SpO2 sensor site after application.
Patient Safety
Do
be processed when the cuff is inflated. Attach the sensor to the limb opposite to the site
used for the blood pressure cuff.
attach an SpO2 sensor distal to a blood press ure cuf f. Va lid data
NOT
CANNOT
18-Jul-94 Model 511 Service Manual 3
3
• Explosion Hazard: Do NOT use the Model 511 in the presence of flammable
anesthetics. Use of this instrument in such an environment may present an
!
explosion hazard.
• Electrical Shock Hazard: Always turn the oximeter off before cleaning it. Do
NOT use a damaged sensor or one with exposed electrical contacts.
• Patient Safety: Care should be exercised to assure continued peripheral
perfusion distal to the SpO2 sensor site after application.
• Failure of Operation: If the oximeter fails to respond as described, do not use
it until the situation has been corrected by qualified personnel.
• Data Validity: Do NOT attach a sensor distal to a blood pressure cuff. Valid
data CANNOT be processed when the cuff is inflated. Attach the sensor to the
limb opposite to the site used for the blood pressure cuff.
• Data Validity: As with all pulse oximeters, ina ccurate SpO2 and Pulse Rate
values may be caused by:
Warnings
Warning
Indicates a potentially harmful condition
that can lead to personal injury.
• Incorrect application or use of a sensor
• Significant levels of dysfunctional hemoglobin; carboxyhemoglobin or
methemoglobin
• Significant levels of indocyanine green, methylene blue, or other intravascular dyes
• Exposure to excessive illumination such as surgical lamps—especially
ones with a xenon light source, or direct sunlight
• Excessive patient movement
• Venous pulsations
• Electrosurgical interference
4 Model 511 Service Manua l 6116-90-00
4
• Do not operate the Model 511 when it is wet due to spills or condensation.
• Do not operate the Model 511 if it appears to have been dropped or damaged.
• Never sterilize or immerse the monitor in liquids.
• Do not sterilize or immerse sensors except as directed in this manual.
• No tension should be applied to any sensor cable.
• Do not store the monitor or sensors at temperatures less than 14° F (-10° C) or
greater than 131° F (55° C).
• Do not operate the monitor or sensors at temperatures less than 50° F (10° C) or
greater than 104° F (40° C).
• Caution: Federal (U.S.A.) law restricts this device to sale, distribution, or use by
or on the order of a licensed medical practitioner.
Cautions
Caution
Indicates a condition that may lead to
equipment damage or malfunction.
18-Jul-94 Model 511 Service Manual 5
5
Front Panel
SpO
2
SATURATION PULSE RATE
%
beats/min
511
Pulse Oximeter
Saturation and
Pulse Rate
display
identifiers
LCD Display
Audible Alert
Enable/Disable
control
Po wer On/Off
and Illumination
control
DC input jack
Figure 1. Front panel illustration
6 Model 511 Service Manua l 6116-90-00
6
Summary of Operation
Power On/Off
1. To turn the monitor on, press the power control.
A tone sounds to verify audio is functional, the monitor performs a system
self-test, all display segments are briefly illuminated, the software version is
displayed in the
RATE
section, and finally the operational display appears.
2. To illuminate the display for better viewability under low ambient lighting
conditions, press the power control key and hold until the backlight
illuminates when turning the monitor on.
The display illumination will remain on until the monitor is turned off.
3. To turn the monitor off, press the power control.
SATURATION
section and the model number in the
Audible Alert Enable/Disable
1. To toggle between enabled and disabled audible alarms, press and release the
alarm key.
If pressing and releasing the alarm key causes the alarms to be enabled, the
monitor shall display the saturation auto alert limit settings (in the SpO2 and
pulse rate displays) for three seconds, beep once, and turn off the alarm icon.
The alarm display icon will not be displayed while audible al arms are enabled.
All visible alerts continuously active for longer than 10 seconds will cause an
unlatched audible alarm to sound.
6.1
PULSE
6.2
If pressing and releasing the alarm key causes the alarms to be disabled, the
monitor shall beep once, and turn on the alarm icon. The alarm display icon
will illuminate as a warning that the audible alarms are disabled.
2. To set alert limits, press and hold the alert key for more than 3 seconds. The
monitor will beep twice if new limits are set (based on valid SpO2 values). If
no SpO2 is displayed, the monitor will use default limits and will beep three
times.
18-Jul-94 Model 511 Service Manual 7
Section 6 Summary of Operation
The Model 511 will display the high limit in the SpO2 display, the low limit
in the pulse rate display for three seconds. The monitor will then return to
normal operation.
NOTE: Setting alert limits automatically enables the audible alarms.
To display limits without setting new limits if audio is enabled, press and
release the alarm key twice. The first press turns off the alarms and the second
turns then back on and causes the high and low limits to be displayed for one
second. The monitor will then return to normal operation.
To display limits without setting new limits if the audio is disabled, press and
release the alarm key. The high and low limits will be displayed for one
second before the monitor returns to normal operation. Press the alarm key to
disable the audible alarms.
Battery Life
The Model 511 displays a battery icon to indicate:
• fully charged batteries
• approximately one half the initial battery charge remains
• indicates less than 30 minutes of battery life remain.
The battery icon may appear fully charged for the first minute after power up,
after which it will reflect the true battery charge. If the monitor continues
operating while in the low battery st ate, the monitor eventually shuts itself off.
NOTE: The battery icon will remain on the display when the external DC supply is
connected and powering the monitor. The icon will indicate the fully charged batteries
condition, this in reality is an indication of the external DC supply, not the condition of the
batteries. For proper indication of battery life the external DC supply must be unplugged
from the monitor.
6.3
8
Model 511 Service Manual 6116-90-00
7
Electronic Theory of Operation
The electronic theory of operation of the Model 511 Pulse Oximeter monitor is
detailed in the subsections below. Section 15,
on page 59 for more information.
There are subtle differences between the first rele ase circuit boards and the later
revision, these are noted in the text with an explanation of the circuit operation.
Schematic and Assembly Drawings
,
2710 Analog Board
The 2710 Analog board contains the drive circuitry for the sensor’s LEDs, the
photodiode’s detection circuitry, the power supply, and the turn on circuitry. The
batteries and sensor are connected to the analog board, this is then connected to the
2711 digital board by two header connectors.
Power Supply
Power for the Model 511 Pulse Oximeter is derived from four 1.5 volt Alkaline
batteries (see page 2 of schematic). These are connected to J404 on the 2710 Analog
Board. Check the serial number suffix on the unit to determine the type of power up
circuitry the monitor contains as described below. Different revision levels of the
2710 analog board will have differences in this circuitry.
Units with a “Z“ in the serial number suffix. Power enters J404 as VBAT, F202
protects against excessive current flow. When the PWRSWIN line pulses high the
N-channel FET of IC17 will be biased on, this in turn biases the P-channel portion
7.1
7.1.1
18-Jul-94 Model 511 Service Manual 9
Section 7 Electronic Theory of Operation
VBATT
PWRSWIN
F202
500ma
R13 100K
R12 511
D9 MMDB301L
J404 1,2
To IC15
IC17 Si9942
To Drain of Q2 and
R18 junction
R25
R23
C24
J401 11, 13
VBATT
VBATTF
1
2
3
4
5,
6
7,
8
on and allows power to flow through to IC15. Switching regul ator IC15 will supply
6.5 volts DC with an input voltage ranging from 4-6 volts DC.
Figure 2.
Revision 00 power turn on circuitry
In order to prevent F202 from blowing in the event that the batteries are installed
incorrectly, a MOSFET is used. The modification is shown below.1 Later revision
boards have this modification designed in.
pins 1, 2, 3 to units positive input (red)
MOSFET
pins 5, 6, 7, 8 to positive
terminal of DC input jack (red)
Model 511 bottom case half
MOSFET: PN: 485538
(Si 9405)
pin 4 to battery ground (black)
10
Model 511 Service Man ual 6116-90-00
1. Units with this modification can be identified by a “Z” in the serial number suffix.
Figure 3.
Fuse protection modification
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