Dräger Narkomed 2B User manual

DrägerService®
Technical
Service
Manual
Part Number: S002011
Rev: Y
Date: 20 May 2002
© 2002 Draeger Medical, Inc.
Narkomed 2B
Anesthesia System
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DrägerService®
Narkomed 2B Service Manual Table of Contents
Summary of What's New in Rev. Y
DESCRIPTION PAGE
SECTION 1:
Introduction ............................................................... 1-1
SECTION 2:
Diagnostics ............................................................... 2-1
2.1 Service Menu Screen ............................................ 2-2
SECTION 3:
Troubleshooting ............................................................ 3-1
3.1 Power Supply and Voltage Distribution .............................. 3-1
3.2 Battery ...................................................... 3-3
3.3 Troubleshooting Guides .......................................... 3-3
SECTION 4:
Replacement Procedures ..................................................... 4-1
4.1 Cylinder Yoke Assemblies ........................................ 4-2
4.2 Cylinder Pressure Regulators ...................................... 4-5
4.3 Cylinder Cutoff Valves (Canada) ................................... 4-8
4.4 Cylinder and Pipeline Pressure Gauges ............................. 4-11
4.5 Flowmeters .................................................. 4-15
4.6 Flow Control Valves ............................................ 4-19
4.7 Oxygen Supply Pressure Failure Protection Device ..................... 4-22
4.8 Oxygen Supply Pressure Alarm Switch (earlier machines) ............... 4-25
4.9 Oxygen Supply Pressure Alarm Whistle (Canada) ..................... 4-28
4.10 Oxygen Ratio Monitor/Controller .................................. 4-30
4.11 Oxygen Ratio Controller (later machines) ............................ 4-34
4.12 Vaporizers ................................................... 4-37
4.13 O2Flush Valve ................................................ 4-40
4.14 AV-E Ventilator Controller Assembly ............................... 4-44
4.15 AV-E Ventilator Solenoid Valve ................................... 4-47
4.16 AV-2 Ventilator Controller Assembly ............................... 4-50
4.17 Convenience Outlet AC Power Filter ............................... 4-53
4.18 AV-E Inspiratory Flow Regulator .................................. 4-56
4.19 Ventilator Bellows Valve and Guide Assembly (AV-E Ventilator) .......... 4-59
4.20 Ventilator Bellows Valve and Guide Asm w/Press Lim Ctrl (AV-2) ......... 4-69
4.21 Alarm Channel (without oxygen supply pressure alarm switch) ........... 4-73
4.22 Alarm Channel and Oxygen Supply Pressure Alarm Switch .............. 4-76
4.23 Caster ...................................................... 4-80
4.24 Battery ..................................................... 4-83
4.25 Power Supply ................................................. 4-86
4.26 Processor Assembly ............................................ 4-89
4.27 CRT Assemblies ............................................... 4-92
4.28 Keypads ..................................................... 4-96
4.29 SPIROMED Respiratory Volume Sensor ............................. 4-99
Rev. T i
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CONTENTS (continued) NM2B
DESCRIPTION PAGE
4.30 Oxygen Sensor .......................................... 4-101
4.31 Manual Sphygmomanometer ............................... 4-103
4.32 Auxiliary Oxygen Flowmeter ............................... 4-105
4.33 PEEP Valve Magnet Assembly Replacement ................... 4-107
SECTION 5:
Adjustment and Calibration Procedures ...................................5-1
5.1 Cylinder Pressure Regulator Adjustment (except CO2) ..............5-2
5.1A CO2Cylinder Pressure Regulator Adjustment ....................5-4
5.2 Oxygen Supply Pressure Alarm Switch Adjustment (earlier machines) . 5-5
5.3 Oxygen Supply Pressure Alarm Switch Adjustment (later machines
with switch on alarm channel) ................5-8
5.4 Oxygen Ratio Monitor/Controller (ORMC) Adjustment ............. 5-11
5.5 Oxygen Ratio Controller (ORC) Adjustment ..................... 5-15
5.5A Low Flow Oxygen Ratio Controller (ORC) Adjustment ............5-17A
5.6 Oxygen Sensor Calibration .................................. 5-18
5.7 Breathing Pressure Monitor Calibration ........................ 5-21
5.8 Vaporizer Interlock Adjustment .............................. 5-23
SECTION 6:
PMS Procedure ......................................................6-1
6.1 Electrical Safety ...........................................6-2
6.2 Self-Diagnostics ...........................................6-4
6.3 Battery Circuit ............................................6-5
6.4 Configuration .............................................6-5
6.5 Service Data .............................................6-6
6.6 Calibrations ..............................................6-7
6.7A Scavenger, A/C ............................................6-8
6.7B Scavenger, Open Reservoir ...................................6-9
6.7C Scavenger Interface ....................................... 6-11
6.7D Suction Regulator ........................................ 6-13
6.8 Breathing System ........................................ 6-14
6.9 Manual Sphygmomanometer ................................ 6-22
6.10 Vapor Exclusion System .................................... 6-23
6.11 Yokes & Gauges .......................................... 6-24
6.12 High Pressure Regulator ................................... 6-26
6.13 High Pressure Leak ....................................... 6-28
6.14 Oxygen Supply Failure Protection ............................ 6-31
6.15 Flowmeters ............................................. 6-35
6.16 O2Med................................................. 6-38
6.17 Oxygen Concentrations .................................... 6-40
6.18 Auxiliary Oxygen flowmeter ................................. 6-43
6.19A Oxygen Ratio Controller .................................... 6-44
6.19B Oxygen Ratio Monitor Controller ............................. 6-45
6.20 Baromed ............................................... 6-47
6.21 Ventilator .............................................. 6-49
6.22 Bellows Drive Gas Leak: Adult .............................. 6-50
6.23 Spiromed ............................................... 6-51
Rev. W
ii
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NM2B CONTENTS (continued)
DESCRIPTION PAGE
6.24 Manual Sphygmomanometer ................................ 6-39
6.24A Bellows: Adult ........................................... 6-53
6.24B Ventilator Relief Valve: Adult ............................... 6-53
6.25A Bellows: Pediatric External ................................. 6-54
6.25B Bellows: Pediatric Internal .................................. 6-56
6.26 Trace & Trend ........................................... 6-58
6.27 Pressure Limit Controller .................................. 6-58
6.28 Bellows Peep Valve ....................................... 6-59
6.29 Audio Silence ............................................ 6-59
6.30 Oxygen Flush Valve ....................................... 6-60
6.31 Final Tests .............................................. 6-61
SECTION 7:
Software Update Procedure .............................................7-1
SECTION 8:
Spare and Replacement Parts
ASSEMBLY/PART PAGE
Monitor Chassis, Front Bezel, Power Supply, Processor Assembly, CRT Assemblies ...... 8-2, 8-3
AV-E Ventilator Box Assembly, Incl. Controller ................................. 8-4, 8-5
AV-2 Ventilator Controller Assembly ......................................... 8-6, 8-7
AV-E Ventilator Bellows Valve & Guide Assembly ............................... 8-8, 8-9
AV-2 Valve Case and Guide Assembly, Press. Limit Control, Bellows Assembly. ...... 8-10, 8-11
Bellows valve assembly details ......................................... 8-11A, 8-11B
Pipeline Inlet Fittings .................................................. 8-12, 8-13
Failsafe Assemblies, Minimum O2Flow Valve Assembly ........................ 8-14, 8-15
Gas Selector Switch and Valves ........................................... 8-16, 8-17
Vapor Exclusion System .............................................. 8-17A, 8-17B
ORMC (Earlier Config.) O2Alarm Switch, Alarm Channel, Alarm Whistle ........... 8-18, 8-19
ORC Assembly ........................................................ 8-20, 8-21
Alarm Channel Assembly with O2Alarm Switch (Later Configurations) ............. 8-22, 8-23
Flowmeter Shields, Knobs, Labels, Gauges .................................. 8-24, 8-25
Flow Tubes, Restrictor Assemblies, Flow Control Valve ......................... 8-26, 8-27
Cyl. Regulator Assemblies, O2Flush Valve and related parts ..................... 8-28, 8-29
CSA Items: Relief Valve, Cylinder Cutoff Valves .............................. 8-30, 8-31
Canada Fresh Gas Outlet ............................................. 8-31A, 8-31B
Cylinder Yokes, Common Parts, Labels ..................................... 8-32, 8-33
Sensor Interface Panel Asms., AC Power, Casters ............................. 8-34, 8-35
Absorber Assembly, Breathing Pressure Hoses, Oxygen Sensor ................... 8-36, 8-37
Ultrasonic Flow Sensor ............................................... 8-37A, 8-37B
Ultrasonic Flow Sensor Mounting Bracket .................................8-37C, 8-37D
Man/Auto Selector Valve ................................................ 8-38, 8-39
Man/Auto Selector Valve (Later Design) .................................... 8-40, 8-41
Auxiliary O2Flowmeter Assembly ......................................... 8-42, 8-43
Open Reservoir Scavenger ............................................... 8-44, 8-45
Open Reservior Scavenger, old style ....................................... 8-46, 8-47
A/C Scavenger ........................................................ 8-48, 8-49
Suction Scavenger ..................................................... 8-50, 8-51
Rev. X iii
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NARKOMED 2B ANESTHESIA SYSTEM
SYSTEM
CONTROL
KEYS
MONITO
R
CONTROL
KEYS
MANUAL
SPHYGMOMANOMETER
(OPTIONAL)
ALARM
DISPLAY
DATA DISPLA
Y
BREATHING
SYSTEM SENSOR
INTERFACE PANEL
BOOM
A
RM
SV20001
1-0 Rev. F
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NM2B INTRODUCTION
1.0 Recommendations
Because of the sophisticated nature of Draeger Medical, Inc. anesthesia equipment and itscritical
importance in the operating room setting, it is highly recommended that only appropriately
trained and experienced professionals be permitted to service and maintain this equipment.
Please contact DrägerService® at [phone] for service of this equipment.
Draeger Medical, Inc. also recommends that its anesthesia equipment be serviced at three-month
intervals. Periodic Manufacturer’s Service Agreements are available for equipmentmanufactured
by Draeger Medical, Inc. For further information concerning these agreements, please contact us
at [phone].
Draeger Medical, Inc. products/material in need of factory repair shall be sent to:
DrägerService
3124 Commerce Drive
Telford, PA 18969
(Include RMA Number)
HOW TO USE THIS MANUAL
The manual is divided into several sections. The DIAGNOSTICS section describes self-test and
service diagnostics for checking the system functions. An understanding of the on-board service
capabilities is necessary before any attempt is made to troubleshoot the unit. The
TROUBLESHOOTING section lists error codes and provides troubleshooting guides to assist the
TSR in locating the source of a problem. The REPLACEMENT PROCEDURES section contains
instructions for removal and replacement of the assemblies that are considered field-replaceable.
The ADJUSTMENT AND CALIBRATION PROCEDURES section contains the field procedures
needed to restore original system specifications. The Periodic Manufacturer’s Service (PMS)
PROCEDURE section outlines the steps required to verify the electrical, mechanical and
pneumatic safety of the unit and also identifies components requiring periodic replacement.
GENERAL TROUBLESHOOTING GUIDELINES
Troubleshooting the Narkomed 2B should always begin by communicating with those who
observedor experienceda problemwith the unit. This may eliminate unnecessary troubleshooting
steps. Once a general problem is identified, refer to the troubleshooting flow charts in Section 3
to determine the proper corrective action to be taken.
After a component has been replaced, verify that the unit is operating properly by running the
appropriate diagnostic procedure. The PMS PROCEDURE in Section 6 must also be performed
after any component has been replaced.
The general arrangement of the Narkomed 2B Anesthesia System is shown on the opposite page.
WARNINGS are used in this manual before procedures which if not performed correctly could
result in personal injury.
CAUTIONS are used in this manual to alert service personnel to the possibility of damage to the
equipment if a procedure is not performed correctly.
Rev. K 1-1
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INTRODUCTION NM2B
Copyright
Copyright © 2001 by Draeger Medical, Inc. All rights reserved. No part of this publication
may be reproduced, transmitted, transcribed, or stored in a retrieval system in any form or
by any means, electronic or mechanical, including photocopying and recording, without the
written permission of Draeger Medical, Inc.
Trademark Notices
CliniDAS, Datagrip, NAD Information Systems, NAD Logo, Narkomed, O.R. Data Manager,
O.R. Link, ORM, PC Prep/View, Quality Service For Life, Vigilance Audit, Vitalert, Vitalink
and Narkomed GS are registered trademarks of Draeger Medical, Inc. All other products or
name brands are trademarks of their respective owners.
Disclaimer
The content of this manual is furnished for informational use only and is subject to change
without notice. Draeger Medical, Inc. assumes no responsibility or liability for any errors or
inaccuracies that may appear in this manual.
Rev. N
1-2
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NM2B DIAGNOSTICS
2.0 DIAGNOSTICS
The Narkomed 2B contains a diagnostic system that monitors certain system functions and
records their operational status. A series of tests is performed when the system is powered
up and the results are displayed on the diagnostics screen shown in Figure 2-1. Further
diagnostic functions are available through service screens that can be called up by a TSR at
the display panel. The following paragraphs provide a description of each service screen that
can be accessed through system control keys on the display panel. If no display is present
upon system power-up, refer to Section 3 of this manual for troubleshooting assistance.
Figure 2-1: POWER-UP DIAGNOSTICS SCREEN
NARKOMED 2B
VIDEO TEST PASS VERSION 2.02 DIAGNOSTICS
FIRMWARE TEST PASS COPYRIGHT, NAD INC. 1987-89
MEMORY TEST PASS
TIMERS TEST PASS
ANALOG TEST PASS
AUDIO TEST - PRIMARY PASS
- BACKUP PASS
SERIAL I/O TEST PASS
CLOCK TEST PASS
BACKUP MEMORY TEST PASS
AC POWER TEST PASS
RESERVE POWER TEST PASS
FUNCTIONAL
TRACE
TREND
2-1
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DIAGNOSTICS (continued) NM2B
2.1 Service Menu Screen
To access the Service Menu Screen, press and hold the CONFIG key, and
(while holding the CONFIG key) simultaneously press the 21% and APNEA
ALARM DISABLE keys. These keys are located on the monitor control key
panel. The Service Menu Screen appears as shown in Figure 2-2. Access to the
other service functions is gained through the keys to the right of the service
screen which temporarily function according to their corresponding on-screen
labels.
Figure 2-2: SERVICE MENU SCREEN
SERVICE MENU DIAGNOSTICS
CALIBRATION
EXIT
TRACE
TREND
Rev. A
2-2
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NM2B DIAGNOSTICS (continued)
2.1.1 Diagnostics Menu Screen
Pressing the DIAGNOSTICS key on the Service Menu Screen brings up
the Diagnostics Menu Screen. Figure 2-3 shows a typical Diagnostics
menu which displays the last service date and an error log. To reset the
last service date to the current date, press the RESET DATE key.
NOTE: The RESET DATE key also clears all stored error codes,
so the date should not be reset until the indicated
problems are resolved. If the processor assembly must be
replaced, the original assembly should be returned to the
NAD Technical Service Department with all of its stored
error codes.
Each line in the Error Log is displayed as three groups of hexadecimal
characters, with each group having a left and right character (see
Figure 2-3). Tables 2-1, 2-2 and 2-3 on the following pages list the
possible errors that correspond to the displayed characters in each
group.
Figure 2-3: DIAGNOSTICS MENU SCREEN
DIAGNOSTICS MENU KEY TEST
LAST SERVICE DATE 14-JUN-91
ERROR LOG 00 00 40 RESET DATE
Group 1 Group 2 Group 3
EXIT
TRACE
TREND
Rev. L 2-3
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DIAGNOSTICS (continued) NM2B
Table 2-1: NARKOMED 2B ERROR CODES, GROUP 1
Left
Char. Error(s) Right Char. Error(s)
0 No Error 0 No Error
1 System memory fail (checkerboard test) 1 CRT controller fail (readback test)
2 System memory fail (ROM compare test) 2 CRT memory fail (checkerboard test)
3 System memory fail (checkerboard test)
System memory fail (ROM compare test) 3 CRT controller fail (readback test) CRT memory fail (checkerboard test)
4 CTC fail (timer function test) 4 CRT memory fail (ROM compare test)
5 CTC fail (timer function test)
System memory fail (checkerboard test) 5 CRT memory fail (ROM compare test) CRT controller fail (readback test)
6 CTC fail (timer function test)
System memory fail (ROM compare test) 6 CRT memory fail (ROM compare test) CRT memory fail (checkerboard test)
7 CTC fail (timer function test)
System memory fail (ROM compare test)
System memory fail (checkerboard test)
7 CRT memory fail (ROM compare test)
CRT memory fail (checkerboard test)
CRT controller fail (readback test)
8 CTC fail (interrupt logic test) 8 ROM fail (firmware CRT test)
9 CTC fail (interrupt logic test)
System memory fail (checkerboard test) 9 ROM fail (firmware CRT test) CRT controller fail (readback test)
A CTC fail (interrupt logic test)
System memory fail (ROM compare test) A ROM fail (firmware CRT test) CRT memory fail (checkerboard test)
B CTC fail (interrupt logic test)
System memory fail (ROM compare test)
System memory fail (checkerboard test)
B ROM fail (firmware CRT test)
CRT memory fail (checkerboard test)
CRT controller fail (readback test)
C CTC fail (interrupt logic test)
CTC fail (timer function test) C ROM fail (firmware CRT test) CRT memory fail (ROM compare test)
D CTC fail (interrupt logic test)
CTC fail (timer function test)
System memory fail (checkerboard test)
D ROM fail (firmware CRT test)
CRT memory fail (ROM compare test)
CRT controller fail (readback test)
E CTC fail (timer function test)
CTC fail (interrupt logic test)
System memory fail (ROM compare test)
E ROM fail (firmware CRT test)
CRT memory fail (ROM compare test)
CRT memory fail (checkerboard test)
F CTC fail (interrupt logic test)
CTC fail (timer function test)
System memory fail (ROM compare test)
System memory fail (checkerboard test)
F ROM fail (firmware CRT test)
CRT memory fail (ROM compare test)
CRT memory fail (checkerboard test)
CRT controller fail (readback test)
Rev. L
2-4
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NM2B DIAGNOSTICS (continued)
Table 2-2: NARKOMED 2B ERROR CODES, GROUP 2
Left
Char. Error(s) Right Char. Error(s)
0 No Error 0 No Error
1 Backup audio fail (sound generation test) 1 A/D conv. fail (analog V out of range)
2 Serial port B fail (channel A on UART) 2 Primary audio fail (speaker test)
3 Backup audio fail (sound generation test)
Serial port B fail (channel A on UART) 3 A/D conv. fail (analog V out of range) Primary audio fail (speaker test)
4 Serial port A fail (channel B on UART) 4 Primary audio fail (sound gen. test)
5 Serial port A fail (channel B on UART)
Backup audio fail (sound generation test) 5 Primary audio fail (sound gen. test) A/D conv. fail (analog V out of range)
6 Serial port A fail (channel B on UART)
Serial port B fail (channel A on UART) 6 Primary audio fail (sound gen. test) Primary audio fail (speaker test)
7 Serial port A fail (channel B on UART)
Serial port B fail (channel A on UART)
Backup audio fail (sound generation test)
7 Primary audio fail (sound gen. test)
Primary audio fail (speaker test)
A/D conv. fail (analog V out of range)
8 Clock fail (cannot read) 8 Backup audio fail (speaker test)
9 Clock fail (cannot read)
Backup audio fail (sound generation test) 9 Backup audio fail (speaker test) A/D conv. fail (analog V out of range)
A Clock fail (cannot read)
Serial port B fail (channel A on UART) A Backup audio fail (speaker test) Primary audio fail (speaker test)
B Clock fail (cannot read)
Serial port B fail (channel A on UART)
Backup audio fail (sound generation test)
B Backup audio fail (speaker test)
Primary audio fail (speaker test)
A/D conv. fail (analog V out of range)
C Clock fail (cannot read)
Serial port A fail (channel B on UART) C Backup audio fail (speaker test) Primary audio fail (sound gen. test)
D Clock fail (cannot read)
Serial port A fail (channel B on UART)
Backup audio fail (sound generation test)
D Backup audio fail (speaker test)
Primary audio fail (sound gen. test)
A/D conv. fail (analog V out of range)
E Clock fail (cannot read)
Serial port A fail (channel B on UART)
Serial port B fail (channel A on UART)
E Backup audio fail (speaker test)
Primary audio fail (sound gen. test)
Primary audio fail (speaker test)
F Clock fail (cannot read)
Serial port A fail (channel B on UART)
Serial port B fail (channel A on UART)
Backup audio fail (sound generation test)
F Backup audio fail (speaker test)
Primary audio fail (sound gen. test)
Primary audio fail (speaker test)
A/D conv. fail (analog V out of range)
Rev. L 2-5
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DIAGNOSTICS (continued) NM2B
Table 2-3: NARKOMED 2B ERROR CODES, GROUP 3
Left
Char. Error(s) Right Char. Error(s)
0 No Error 0 No Error
1 Backup memory fail (ROM compare test) 1 Clock fail (write/readback test)
2 Backup memory fail (array recall test) 2 Clock fail (original time test)
3 Backup memory fail (ROM compare test)
Backup memory fail (array recall test) 3 Clock fail (write/readback test) Clock fail (original time test)
4 AC power fail 4 Clock fail (seconds not incrementing)
5 AC power fail
Backup memory fail (ROM compare test) 5 Clock fail (seconds not incrementing) Clock fail (write/readback test)
6 AC power fail
Backup memory fail (array recall test) 6 Clock fail (seconds not incrementing) Clock fail (original time test)
7 AC power fail
Backup memory fail (array recall test)
Backup memory fail (ROM compare test)
7 Clock fail (seconds not incrementing)
Clock fail (original time test)
Clock fail (write/readback test)
8 Reserve power fail (batt. low/disconnected) 8 Backup memory fail (checkerboard test)
9 Reserve power fail (batt. low/disconnected)
Backup memory fail (ROM compare test) 9 Backup memory fail (checkerboard test) Clock fail (write/readback test)
A Reserve power fail (batt. low/disconnected)
Backup memory fail (array recall test) A Backup memory fail (checkerboard test) Clock fail (original time test)
B Reserve power fail (batt. low/disconnected)
Backup memory fail (array recall test)
Backup memory fail (ROM compare test)
B Backup memory fail (checkerboard test)
Clock fail (original time test)
Clock fail (write/readback test)
C Reserve power fail (batt. low/disconnected)
AC power fail C Backup memory fail (checkerboard test) Clock fail (seconds not incrementing)
D Reserve power fail (batt. low/disconnected)
AC power fail
Backup memory fail (ROM compare test)
D Backup memory fail (checkerboard test)
Clock fail (seconds not incrementing)
Clock fail (write/readback test)
E Reserve power fail (batt. low/disconnected)
AC power fail
Backup memory fail (array recall test)
E Backup memory fail (checkerboard test)
Clock fail (seconds not incrementing)
Clock fail (original time test)
F Reserve power fail (batt. low/disconnected)
AC power fail
Backup memory fail (array recall test)
Backup memory fail (ROM compare test)
F Backup memory fail (checkerboard test)
Clock fail (seconds not incrementing)
Clock fail (original time test)
Clock fail (write/readback test)
2-5A Rev. L
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NM2B DIAGNOSTICS (continued)
With the exception of the error codes corresponding to AC power and battery
failure, the codes listed in Tables 2-1 thru 2-3 indicate a possible problem in
the NARKOMED 2B processor assembly.
Troubleshooting should begin with a check of the power supply voltages on the
processor board (see Section 3) followed by a check of all connections to the
processor assembly. Refer to Section 4 for removal and replacement procedures
for the field-replaceable assemblies in the NARKOMED 2B.
Rev. L 2-5B
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DIAGNOSTICS (continued) NM2B
2.1.1.1 Key Panel Test Screen
Pressing the KEY TEST key in the Diagnostics Menu
Screen allows the TSR to check each key on the display
panel. As each key on the display panel is pressed, a
corresponding key is illuminated on the Key Panel Test
Screen as shown in Figure 2-4.
NOTE: The TREND key should be pressed last,
because it also exits the Key Panel Test
Screen.
If the correct keypanel response is not obtained, refer to
Section 3 for the appropriate troubleshooting procedure.
Figure 2-4: KEY PANEL TEST SCREEN
EXIT
TRACE
TREND
2-6
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NM2B DIAGNOSTICS (continued)
2.1.2 Calibration Menu Screen
Pressing the CALIBRATION key on the Service Menu Screen brings up
the Calibration Menu Screen. This menu allows the TSR to perform
calibration for the Oxygen Analyzer sensor and the Breathing Pressure
Monitor. Figure 2-5 shows a typical Calibration Menu Screen. The four-
digit numbers in the left column show the current values, while the
numbers in the right column show the values stored from the previous
calibration.
For a valid zero calibration of the Oxygen Analyzer sensor, the two
offset readings should be between 125 and 145, and the difference
between Cell A and Cell B should be no greater than 8. Pressing the
O2MED key stores the values, and the message OXYGEN OFFSET
READINGS STORED appears on the screen. Refer to Section 5 of this
manual for the complete calibration procedure.
For a valid calibration of the Breathing Pressure Monitor, the pressure
span reading at 60 cm H2O should be between 465 and 519. Pressing
the BAROMED key stores the value, and the message PRESSURE
SPAN READING STORED appears on the screen. Refer to Section 5 of
this manual for the complete calibration procedure.
Figure 2-5: CALIBRATION MENU SCREEN
CALIBRATION MENU O2MED
OFFSET O2 CELL A 0138 0127
OFFSET O2 CELL B 0138 0129 BAROMED
OXYGEN OFFSET READINGS STORED
PRESSURE SPAN (60 cm H2O) 0243 0481
EXIT
TRACE
TREND
Rev. A 2-7
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NM2B TROUBLESHOOTING GUIDE
3.0 TROUBLESHOOTING
This section contains information to assist the Draeger Medical, Inc. qualified
Technical Service Representative (TSR) in locating electrical faults affecting the
NARKOMED 2B monitoring and display devices. Since most troubleshooting efforts
begin with verifying power supply voltages, the following paragraph outlines the
voltage distribution scheme within the machine along with test points for each of the
voltages.
3.1 Power Supply and Voltage Distribution
In the NARKOMED 2B the power supply outputs at J10 are connected to J5
on the processor board for distribution. The CRTs are powered by 12 VDC; the
ventilator controller and the alarm channel are powered by 8 VDC. The
processor is powered by 5 VDC along with the other voltages. Under normal
load conditions these voltages are measured at the (+) end of capacitors C23,
C24 and C31 on the processor board. See Figure 3-1. The voltmeter return
should be connected to the (-) end of one of the capacitors. Table 3-1 lists the
acceptable range for each voltage.
TABLE 3-1: PROCESSOR BOARD VOLTAGES
LOCATION VOLTAGE ACCEPTABLE RANGE
+ End of C23 + 5 VDC 4.85 to 5.15 VDC
+ End of C24 + 8 VDC 7.45 to 8.47 VDC
+ End of C31 +12VDC 11.52 to 12.24 VDC
The power supply voltages can also be measured in an unloaded condition.
CAUTION: Before disconnecting the output cable from J10 on the power
supply assembly, turn the System Power switch to STANDBY,
and disconnect the data cable from J9 on the power supply
assembly.
The test points are: +5V: J10-3,-4
+8V: J10-1,-2
+12V: J10-5,-6
Com: J10-7,-8
Rev. H 3-1
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TROUBLESHOOTING GUIDE (continued) NM2B
TOP VIEW OF
PROCESSOR ASSEMBLY
C31
J5
C24
C23
SV20313
Figure 3-1: PROCESSOR BOARD VOLTAGE TEST POINTS
Rev. A
3-2
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