BREATHING SYSTEM
SENSOR INTERFACE PANEL
(VPO ASSEMBLY)
SV45024
1-0Rev. F
Page 9
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NM4INTRODUCTION
1.0 Recommendations
Because of the sophisticated nature of Draeger Medical, Inc. anesthesia equipment and its critical
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 (800) 543-5047 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 equipment manufactured
by Draeger Medical, Inc. For further information concerning these agreements, please contact us
at (800) 543-5047.
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 4 should always begin by communicating withthose who observed
or experienced a problem with 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 4 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.
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.
1-2
Rev. M
Page 11
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NM4DIAGNOSTICS
2.0 DIAGNOSTICS
The NARKOMED 4 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 a series of service screens that can be called up
by a Technical Service Representative at the display panel. The following paragraphs provide
a description of each of the service screens that can be accessed through touch keys on the
display panel. If no display is present upon system power-up, refer to Section 3 of this
manual for troubleshooting assistance.
A PREVENTIVE MAINTENANCE DUE message will appear on the screen if the current
date exceeds the Periodic Manufacturer’s Service due date stored in the machine.
DIAGNOSTICS
VIDEO TESTPASS
FIRMWARE TESTPASS
MEMORY TEST BANK1PASS
MEMORY TEST BANK2PASS
TIMER/INTERRUPT TESTPASS
ANALOG TESTPASS
AUDIO TEST -PRIMARYPASS
NARKOMED 4 SYSTEM SOFTWARE
(C) COPYRIGHT 1988-1995, NAD INC.
VERSION:1.3097 CF
MONITORCHECKOUT
Rev. C
Figure 2-1: POWER-UP DIAGNOSTICS SCREEN
2-1
Page 12
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DIAGNOSTICS (continued)NM4
2.1Main Service Screen
2.1.1View Mode
To access the Main Service Screen, press and hold the Selection DIAL, and
simultaneously press the MONITOR and SYSTEM CONFIG keys. The View
mode service screen shown in Figure 2-2 will appear, displaying the machine
serial number, last service date and machine hours accumulated. Version
numbers for each software set in the machine are also displayed.
If the MONITORS service screens are accessed in the View mode, current
values will be displayed but the operator will not be able to perform
calibrations. A VIEW entry will not be logged into the Service Log.
MACHINE SERIAL NUMBER: 00124001
LAST SERVICE DATE: 03-14-96
HOURS RUNNING SINCE LAST SERVICE: 97
TOTAL HOURS RUNNING: 5610
Touch the Service Code box on the screen, then scroll through the following list
of service codes with the Selection DIAL:
PMS: When performing scheduled Periodic Manufacturer’s Service.
INST: For initial installation of the NM4. This selection will establish
the start date for the warranty period.
SRVC: For unscheduled service visits requiring component
replacements or calibrations.
Press the Selection DIAL to enter the service event into the Service Log.
The Technical Service Representative ID boxes will appear on the screen as
shown in Figure 2-3. Touch the first box, scroll to the desired alpha-numeric
with the Selection DIAL, and press the dial to enter the first character of the
ID. Enter the remaining three characters in the same manner.After the ID has
been entered, the RESET key will be displayed.
NOTE: Following any service procedures, return to this screen and touch the
RESET key to enter the current date as the last service date, and to reset the
Hours Running Since Last Service to zero. Touching the RESET key also
places an entry into the service log.
MACHINE SERIAL NUMBER: 00124001
LAST SERVICE DATE: 03-14-96
HOURS RUNNING SINCE LAST SERVICE: 97
TOTAL HOURS RUNNING: 5610
Touch the SERVICE LOG key to display a list of stored events. Figure 2-4
shows a typical service log screen. The codes displayed are classified as Normal
Events, Failed Events, Error Events, Service Events, and Calibration Events.
These are listed in Tables 2-1 thru 2-6.
Up to 1000 events may be logged. Touching the PREV PAGE key will move the
display backward in time; touching the NEXT PAGE key will move the display
forward in time.
SERVICE LOG
DATETIMEPARAMETERCODE DESCRIPTION
07-14-9118:100000FB640000POWER ON
07-14-9118:13JOHNC009RESP FLOW ZERO
07-14-9118:19JOHNC008RESP FLOW SPAN
PREV
PAGE
NEXT
PAGE
PRINT
SERVICE LOG
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-4: SERVICE LOG SCREEN
2-4
Rev. A
Page 15
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NM4DIAGNOSTICS (continued)
Table 2-1: NM4 SERVICE LOG NORMAL EVENT CODES
CodeDescription
0000Power on
Table 2-2: NM4 SERVICE LOG FAILED EVENT CODES
CodeDescriptionRecommended Action
F011QPDM Address Register Error
F012QPDM Data Register Error
F013QPDM Vblank Int Timeout Err
F014QPDM VRAM Memory Error
F021PROM CRC Test Error
F031SRAM Memory Test Error
F051MFP Bus Error
F052MFP TimerA Error
F053MFP TimerB Error
F054MFP TimerC Error
F055MFP TimerD Error
F056System Clock Error
F057FIFO Empty Interrupt Error
F058ADC Interrupt Error
F059CNTOVF Interrupt Error
F061ADC Interrupt Error
F06212V to -12V Out of Tol Error
Replace Processor
F0635V to GND Out of Tol Error
F071Pri Spkr Static Test Error
F072Pri Spkr Dynamic Test Error
F073Pri Spkr FIFO Test Error
F074Pri Spkr No Vol Test Error
Rev. L
2-5
Page 16
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DIAGNOSTICS (continued)NM4
Table 2-2 (continued): NM4 SERVICE LOG FAILED EVENT CODES
CodeDescriptionRecommended Action
F081Backup Spkr Dynamic Test Err
F082Backup Spkr No Vol Test Err
F091SAO2 Spkr Static Test Error
F092SAO2 Spkr Dynamic Test Error
F093SAO2 Spkr No Vol Test Error
F111Real Time Clock Test Error
F121Bad File Warning
F122Bad Files Error
F123Event Memory Error
F130Alt Processor Fail
F200UART1 Internal Init Fail
F201UART1 Register Readback Fail
F202UART1 Transmit Interrupt Fail
F203UART1 Receive Interrupt Fail
F204UART1 Receive Err Int Fail
F205UART1 Baud Rate Test 1 Fail
F206UART1 Baud Rate Test 2 Fail
F207UART1 Baud Rate Test 3 Fail
F210UART1 Channel 0 Fail
F211UART1 Channel 1 Fail
F212UART1 Channel 2 Fail
F213UART1 Channel 3 Fail
Replace Processor
2-6
Rev. L
Page 17
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NM4DIAGNOSTICS (continued)
Table 2-2 (continued): NM4 SERVICE LOG FAILED EVENT CODES
CodeDescriptionRecommended Action
F214UART1 Channel 4 Fail
F215UART1 Channel 5 Fail
F216UART1 Channel 6 Fail
F217UART1 Channel 7 Fail
F300UART2 Internal Init Fail
F301UART2 Register Readbk Fail
F302UART2 Transmit Interrupt Fail
F303UART2 Receive Interrupt Fail
F304UART2 Receive Err Int Fail
F305UART2 Baud Rate Test 1 Fail
F306UART2 Baud Rate Test 2 Fail
F307UART2 Baud Rate Test 3 Fail
F310UART2 Channel 0 Fail
F311UART2 Channel 1 Fail
F312UART2 Channel 2 Fail
F313UART2 Channel 3 Fail
F314UART2 Channel 4 Fail
F315UART2 Channel 5 Fail
F316UART2 Channel 6 Fail
F317UART2 Channel 7 Fail
Replace Processor
Rev. L
2-7
Page 18
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DIAGNOSTICS (continued)NM4
Table 2-3: NM4 SERVICE LOG ERROR EVENTS
Touch Panel Events
CodeDescriptionRecommended Action
T001Bad Device RecalibrationClear obstructions. If recurring,
replace touch panel
Head Assembly Events
CodeDescriptionRecommended Action
H001Head Temperature ErrorCall Tech. Service
A001Pattern AdjustedNone
Power Supply Events
CodeDescriptionRecommended Action
P001AC FailRestore AC power
P002AC GoodNone
P003Battery LowRecharge battery. If persistent,
replace battery
P004Battery GoodNone
P005Brick BadReplace Pwr Supply PCB
MSPEC Events
CodeDescriptionRecommended Action
M001Channel Err Active CPU
M002Channel Err Inactive CPU
M003Command Retry
M004Comm Error
M005System Fault Max
Replace MSPEC
M006Versiion ID Retry
M007Span Fail
M008Solenoid Stuck
M009Zero Timeout
M010Zero Fail Max
2-8
Rev. L
Page 19
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NM4DIAGNOSTICS (continued)
Table 2-3 (continued): NM4 SERVICE LOG ERROR EVENTS
MSPEC Events (continued)
CodeDescriptionRecommended Action
M011RX Buffer OverflowReplace MSPEC
M012No Continuous DataReplace MSPEC
M013Line Block DiffClear Blockage
M014Line Block Less Than MinClear Blockage
M016Multispec ShutdownReplace MSPEC
M101CD Chan Err
M102Chan Err O2 Info P1
Call Tech. Service
M103Chan Err O2 Info P2
Datagrip Events
DG00Datagrip Internal Error
DG01Datagrip Internal Error
Replace Datagrip
DG02Datagrip Internal Error
Table 2-3 (continued): NM4 SERVICE LOG ERROR EVENTS
NIBP Events
CodeDescriptionRecommended Action
N001NIBP Mon ErrorReplace NIBP
N002NIBP Com ErrorReplace NIBP
N003NIBP Bad DataCall Tech. Service
N004Infl Pres Not GT 30Check for Leaks
N005Error Rcvd from NIBPReplace NIBP
N006NIBP Mode ConflictReplace NIBP
2-8ARev. L
Page 20
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DIAGNOSTICS (continued)NM4
Table 2-4: NM4 SERVICE LOG SERVICE EVENT CODES
CodeDescription
S001INST
S002PMS
S003SRVC
S004Secondary Serv Screen Entry
S005Reset Service Date
S006Service Log Clear
Table 2-5: NM4 SERVICE LOG CALIBRATION EVENT CODES
CodeDescriptionCodeDescription
C001O2 Store Zero AC009Respiratory Flow Store Span
C002O2 Store Zero BC010Respiratory Flow Store Zero
C003Line Block Store ReferenceC011Pressure Store Span
C004Gas Analyzer - StartC012Pressure Store Zero
C005Gas Analyzer - ContinueC013NIBP Infl Check
C006NIBP InflateC014NIBP Defl Ck
C007NIBP StopC015NIBP Leak Ck
C008NIBP Take Reading
Rev. L2-8B
Page 21
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NM4DIAGNOSTICS (continued)
Table 2-6: NM4 O.R. DATA MANAGER EVENT CODES
CodeDescriptionRecommended Action
V001VTLK Com Error
Replace ORDM if recurring
V002VTLK Com Lost
V003VTLK Com RegainedNone
V010ORDM Startup Failure
Replace ORDM
V011ORDM Inact Startup Failure
Table 2-7: NM4 TEMPLATE EVENT CODES
CodeDescriptionRecommended Action
TEM0Template Defaults Loaded
TEM1Recreating Tmplt Database
TEM2Templates Reinitalized
None
TEM3Templates Reinitalized
TEM4Factory Defaults Installed
2-8CRev. L
Page 22
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DIAGNOSTICS (continued)NM4
Touch the PRINT LOG key to obtain a Service Log Printout from the internal
printer. Figure 2-5 shows the format of the printed service log.
Touch the PMS CRITERIA key to bring up the screen shown in Figure 2-6.
Touch the Month window, scroll to the next PMS due month with the Selection
DIAL, and press the dial to enter the month in which the PREVENTIVE
MAINTENANCE DUE message will appear on the power-up screen.
SELECT CRITERIA FOR "PREVENTIVE MAINTENANCE" MESSAGE
MONTH :1991
DEC
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-6: PMS CRITERIA SCREEN
2-9
Page 24
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DIAGNOSTICS (continued)NM4
2.4Monitors
Touch the MONITORS key to bring up a second column of touch keys. These
keys select the calibration screens for the system sensors.
2.4.1Oxygen Monitor Screen
The Oxygen Monitor Screen displays current oxygen cell readings and
provides a calibration procedure forthe oxygen sensor circuitry. A touch
key allows entry of a new zero value. See Figure 2-7.
CURRENT CELL A: 110
CURRENT CELL B: 108
ZERO CALIBRATION PROCEDURE:
- REMOVE FUEL CELL FROM SENSOR HOUSING.
- LET CURRENT CELL VALUES STABILIZE.
- TOUCH "STORE ZERO" KEY TO ENTER
CURRENT VALUES AS CALIBRATED VALUES.
- DISCONNECT O2 SENSOR HOUSING CABLE
BEFORE RE-INSTALLING FUEL CELL.
- RE-INSTALL FUEL CELL.
- RE-CONNECT CABLE
STORED CELL A ZERO: 3
STORED CELL B ZERO: 6
STORE
ZERO
OXYGEN
PRESSURE
RESPIRATORY
FLOW
SpO2
NIBP
GAS
ANALYZER
LINE BLOCK
CALIBRATION
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-7: OXYGEN MONITOR SCREEN
2-10
Page 25
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NM4DIAGNOSTICS (continued)
2.4.2Breathing Pressure Monitor Screen
The Breathing Pressure Monitor Screen displays current airway
pressure and provides a calibration procedure for the pressure sensing
circuitry. Touch keys allow entry of new zero and span settings. See
Figure 2-8.
CURRENT PRESSURE VALUE : 205
ZERO CALIBRATION PROCEDURE:
- REMOVE PRESSURE SAMPLE LINE FROM
ABSORBER; EXPOSE TO AIR.
- LET CURRENT VALUE STABILIZE.
- TOUCH "STORE ZERO" KEY TO ENTER THE
CURRENT VALUE AS THE CALIBRATION ZERO.
SPAN CALIBRATION PROCEDURE:
- REMOVE PRESSURE SAMPLE LINE FROM
ABSORBER.
- APPLY 50 CM H2O CONSTANT PRESSURE AT
SAMPLE LINE, VERIFIED BY A KNOWN,
CALIBRATED METER.
- LET CURRENT VALUE STABILIZE.
- TOUCH "STORE SPAN" KEY TO ENTER THE
CURRENT VALUE AS THE CALIBRATION SPAN.
STORED ZERO: 244
STORED SPAN: 540
STORE
SPAN
STORE
ZERO
OXYGEN
PRESSURE
RESPIRATORY
FLOW
SpO2
NIBP
GAS
ANALYZER
LINE BLOCK
CALIBRATION
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-8: BREATHING PRESSURE MONITOR SCREEN
2-11
Page 26
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DIAGNOSTICS (continued)NM4
2.4.3Respiratory Flow Monitor Screen
The Respiratory Flow Monitor Screen displays the current flow reading
and also shows a calibration procedure for the flow sensing circuitry.
Touch keys are provided for entry of new zero and span settings. See
Figure 2-9.
CURRENT FLOW VALUE : 76
ZERO CALIBRATION PROCEDURE:
- REMOVE SPIROMED SENSOR FROM ABSORBER.
- LET CURRENT VALUE STABILIZE.
- TOUCH "STORE ZERO" KEY TO ENTER THE
CURRENT VALUE AS THE CALIBRATION ZERO.
SPAN CALIBRATION PROCEDURE:
- REMOVE SPIROMED SENSOR FROM ABSORBER.
- ATTACH A GAS SUPPLY AT INPUT OF SENSOR,
AND A CALIBRATED FLOWMETER AT OUTPUT.
- PROVIDE A STEADY 10 L/MIN FLOW THROUGH
SPIROMED SENSOR.
- LET CURRENT VALUE STABILIZE.
- TOUCH "STORE SPAN" KEY TO ENTER THE
CURRENT VALUE AS THE CALIBRATION SPAN.
STORED ZERO: 78
STORED SPAN: 161
STORE
SPAN
STORE
ZERO
OXYGEN
PRESSURE
RESPIRATORY
FLOW
SpO2
NIBP
GAS
ANALYZER
LINE BLOCK
CALIBRATION
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-9: RESPIRATORY FLOW MONITOR SCREEN
2-12
Page 27
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NM4DIAGNOSTICS (continued)
2.4.4SpO2 Monitor Screen
The SpO2Screen displays current values for SpO2, Pulse, SpO2Pleth
and SpO
Bargraph. See Figure 2-10.
2
SpO2 VALUE :98
PULSE VALUE :75
PLETH VALUE :125
BARGRAPH VALUE : 12
OXYGEN
PRESSURE
RESPIRATORY
FLOW
SpO2
NIBP
GAS
ANALYZER
LINE BLOCK
CALIBRATION
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-10: SpO2MONITOR SCREEN
2-13
Page 28
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DIAGNOSTICS (continued)NM4
2.4.5NIBP Monitor Screen
The NIBP Monitor Screen displays Real Time, Systolic, Diastolic and
Mean blood pressure and Pulse.
The TAKE READING touch key will initiate a single NIBP
measurement cycle.
A procedure for checking NIBP cuff inflation pressure against an
external gauge is also displayed, with touch keys to perform the test.
See Figure 2-11.
Refer to Section 6 of this manual for inflation, deflation, and leak
testing procedures.
REAL TIME PRESSURE : 0
SYSTOLIC:130
DIASTOLIC:78
MEAN:98
PULSE:75
NIBP PRESSURE CALIBRATION VERIFICATION:
- PLACE A "T" IN LINE WITH THE BP CUFF.
- ATTACH A PRESSURE GAUGE AT "T".
- TOUCH THE "INFLATE" KEY.
- NIBP MODULE WILL INFLATE CUFF TO
180 MM Hg.
- VERIFY WITH PRESSURE GAUGE.
- TOUCH THE "STOP" KEY TO END THE TEST.
NIBP INFLATION, DEFLATION, AND LEAK CHECKS:
- REFER TO SERVICE MANUAL FOR PROCEDURES.
INFLATION
CHECK
DEFLATION
CHECK
READING
LEAKAGE
INFLATESTOP
TAKE
CHECK
OXYGEN
PRESSURE
RESPIRATORY
FLOW
SpO2
NIBP
GAS
ANALYZER
LINE BLOCK
CALIBRATION
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-11: NIBP MONITOR SCREEN
2-14
Page 29
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NM4DIAGNOSTICS (continued)
2.4.6Gas Analyzer Screen
Current values of CO2,N2O and anesthetic agent are displayed on the
Gas Analyzer Screen along with a span calibration procedure. See
Figure 2-12. (The scrubber bottle replacement instruction is not
displayed on machines having a Model 4610 gas analyzer.)
The MODE window on the gas analyzer screen displays the following
messages:INHIBIT during warm-up
READY after 30 minute warm-up
The STATUS window on the gas analyzer screen displays the following
messages:IDLE before starting calibration
ZERO IN PROGRESS during calibration
ZERO COMPLETE during calibration
SPAN IN PROGRESS during calibration
PASSED or FAILED after calibration
The complete calibration procedure is outlined in Section 5.
CURRENT CO2: *INV*MODE:
CURRENT N2O: 10STATUS:
CURRENT AGENT: *INV*
SPAN CALIBRATION PROCEDURE:
- WAIT FOR MODE = "READY".
- PERFORM GAS ANALYZER ACCURACY TEST.
- IF TEST FAILS, PERFORM SPAN CAL:
- WITH PATIENT CIRCUIT ENABLED:
- TOUCH "START" KEY,
- WAIT FOR STATUS = "ZERO COMPLETE"
- ATTACH SAMPLE LINE TO CALIBRATION BOTTLE.
- TURN FLOW ON BOTTLE TO 250 ML/MIN
- LET THE CURRENT CELL VALUES STABILIZE
- REMOVE THE SAMPLE LINE FROM THE BOTTLE
- TOUCH "CONTINUE" KEY.
- WAIT FOR STATUS = "PASSED" OR "FAILED"
- REPLACE SCRUBBER BOTTLE ANNUALLY.
OXYGEN
PRESSURE
RESPIRATORY
FLOW
SpO2
NIBP
GAS
ANALYZER
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
Figure 2-12: GAS ANALYZER SCREEN
Rev. C
2-15
STARTCONTINUE
LINE BLOCK
CALIBRATION
PERIPHERALS
Page 30
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DIAGNOSTICS (continued)NM4
2.4.7Line Block Screen
The current sample pressure is displayed on the Line Block screen
along with a calibration procedure and a touch key to enter a setpoint
value. See Figure 2-13. The stored reference value is displayed at the
lower left corner of the screen.
CURRENT SAMPLE PRESSURE:200
LINE BLOCK CALIBRATION PROCEDURE:
- WITH PATIENT CIRCUIT ENABLED:
- ENSURE THAT SAMPLE LINE IS
CONNECTED AND UNOCCLUDED.
- PLACE A FLOWMETER AT THE SAMPLE
EXHAUST.
- ATTACH FLOW RESTRICTOR, FIX 0336, TO
PATIENT SAMPLE LINE.
- WAIT FOR VALID CURRENT SAMPLE PRESSURE.
- ADJUST RESTRICTION IN ORDER TO
OBTAIN A FLOW OF 100 ML/MIN.
- TOUCH "STORE REFERENCE" KEY.
- FULLY OCCLUDE SAMPLE LINE AND OBSERVE
THAT LINE BLOCK ALARM BECOMES
ACTIVE AFTER AT LEAST 15 SECONDS.
- REMOVE FLOW RESTRICTOR FROM SAMPLE LINE.
STORED REFERENCE :200
REFERENCE
STORE
OXYGEN
PRESSURE
RESPIRATORY
FLOW
SpO2
NIBP
GAS
ANALYZER
LINE BLOCK
CALIBRATION
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-13: LINE BLOCK CALIBRATION SCREEN
2-16
Page 31
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NM4DIAGNOSTICS (continued)
2.5Peripherals
Touching the PERIPHERALS key brings up a second column of touch keys
thatareusedtoselectadditionalservicescreenfunctions.When
PERIPHERALS is selected, the Relays Status And Control Screen will appear
as shown in Figure 2-14.
2.5.1Relays Status And Control Screen
Printer Relay:
When the ORDM key is selected, the external printer port is
connected to the O.R. DATA MANAGER. See Paragraph 2.8
Remote Panel Relay:
When the ORDM key is selected, the Remote Display will show
the O.R. DATA MANAGER functions. See Paragraph 2.6. When
the NM4 key is selected, the Remote Display shows the NM4
data and alarms.
RELAYS STATUS AND CONTROL SCREEN
PRINTER RELAY:
REMOTE PANEL RELAY:
ORDMNM4
ORDMNM4
RELAYS
DUMP
MAIN
SERVICE
LOG
PMS
CRITERIA
MONITORS
PERIPHERALS
Figure 2-14: RELAYS STATUS AND CONTROL SCREEN
Rev. A
2-17
Page 32
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DIAGNOSTICS (continued)NM4
2.5.2Service Dump Screen
The DUMP key will bring up the Service Dump Screen shown in Figure
2-15. This screen displays processor address and register debug
information. This screen should be checked whenever the machine is
serviced, and any non-zero codes that appear should be recorded and
reported to the N.A.D. Engineering Department.
Touch the PRINT DUMP key to print out the codes on the strip chart
recorder. Figure 2-16 shows the printed format of the Service Dump.
During Power Up/Initialization and following completion of the NM4 boot
sequence, the O.R. DATA MANAGER performs diagnostic tests on its CPU.
Figures 2-17A and 2-17B show the O.R. DATA MANAGER boot information
that appears on the Remote Display.
Error messages may appear in the display at this time. If the keyboard is not
connected at power-up, a keyboard error message appears as shown in the
illustration. System configuration or set-up errors may also appear in the area
shown in the illustration. If an error message is displayed, the screen display
will freeze with a choice of options at the bottom of the screen. The
Troubleshooting Guides in Section 3 provide additional information that
correlates error messages to recommended hardware replacement.
386 Modular BIOS V 3.10/
Copyright (c) 1984 - 90/ Award Software Inc.
LB/386SX R2.0/ 4 Copyright (c) 1985 - 92 Ampro Computers, Inc.
Figure 2-17A: O.R. DATA MANAGER POWER-UP DIAGNOSTICS SCREEN
2-20
Rev. A
Page 35
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NM4DIAGNOSTICS (continued)
Press ESC to abort Hard disk boot
Booting Hard Drive
Loading...
EMM 386 V1.21 /Frame = C0/0/0/ /Kb = 7168 /Bdos = FFFF
DR DOS Release 5.0/
Copyright (c) 1976, 1982, 1988, 1990 Digital Research Inc. All rights reserved.
Ampro Computers, Inc.
Executing runtime.bat on the hard drive.
Executing numoff.com.
Checking the CRC on ordm386.EXE with the CRC saved in the file CRC_ordm.
CRC calculation taking place.
Figure 2-17B: O.R. DATA MANAGER DIAGNOSTICS - SECOND SCREEN
2.7O.R. DATA MANAGER Software Version Window
After power-up and when the O.R. DATA MANAGER is in its normal display
mode, the software version can be displayed by pressing the ALT and V keys
simultaneously. The window shown in Figure 2-18 will appear at the center of
the display for approximately three seconds. The message in parenthesis
(xxxxH) is an identifier that is unique to the particular software installation.
ORDM S/W Ver x.x (xxxxH)
Rev. A
Figure 2-18: SOFTWARE VERSION WINDOW
2-21
Page 36
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DIAGNOSTICS (continued)NM4
2.8Printer Configuration
The O.R. DATA MANAGER is configured to operate with the Hewlett Packard
LaserJet IIP Printer or the Hewlett Packard LaserJet IIIP Printer in the serial
port configuration. The following paragraphs describe how to runa printer selftest, and illustrate the configuration menus that appear on the self-test
printout page.
If the printer ON LINE indicator light is on, press the ON LINE key to
take the printer off-line.
While holding the down the ALT key, press the TEST key. The printer
display window will show 05 SELF TEST.
A few seconds later, 06 PRINT TEST will appear in the display window.
Two pages will print: the self-test printout page and a "cleaning" page.
The self-test printout page lists the settings for both the printer menu
and the configuration menu. The list should read as follows:
PRINTING MENU
COPIES1
FONT SRCI (Internal)
FONT NUM0
TRAYSLC ONLY
JOB SIZELETTER
ORIENTP (Portrait)
LINES OFTXT60
MAN FEEDOFF
SYM SETROMAN-8
CONFIGURATION MENU:
AUTOCONTON
I/OSERIAL
BAUDRATE9600
ROBUSTXON ON
DTRPOLARHI
RAM size:1536K bytes
Firmware Datecode:19890523
Internal Font Datecode:19890213
Font Cartridges Installed:NO
Installed options:LC TRAY (LETTER)
If the self test printout differs from that shown in the illustration (with
the exception of Firmware Datecode and Internal Font Datecode), the
printer’s internal setup must be changed. Refer to the instructions in
the H-P LaserJet IIP Printer User’s Manual, Chapters 3 and 4,
supplied with the printer, for making any changes.
If the printer ON LINE indicator light is on, press the ON LINE key to
take the printer off-line.
While holding the down the ALT key, press the TEST key. The printer
display window will show 05 SELF TEST.
A few seconds later, 06 PRINT TEST will appear in the display window.
Two pages will print: the self-test printout page and a "cleaning" page.
The self-test printout page lists the settings for both the printer menu
and the configuration menu. The list should read as follows:
PRINTING MENU:
MP SIZELETTER
COPIES1
FONT SRCI (Internal)
FONT NUM0
TRAYSLC ONLY
JOB SIZELETTER
ORIENTP (Portrait)
LINES OFTXT60
MAN FEEDOFF
SYM SETROMAN-8
CONFIGURATION MENU:
AUTOCONTON
I/OSERIAL
BAUDRATE9600
ROBUSTXON ON
DTRPOLARHI
RETMEDIUM
RAM size:1024K bytes
Page Count:6574
Firmware Datecode:19910523
Internal Font Datecode:19910213
Font Cartridges Installed:NO
Installed options:LC TRAY (LETTER)
If the self test printout differs from that shown in the illustration (with
the exception of Page Count, Firmware Datecode and Internal Font
Datecode), the printer’s internal setup must be changed. Refer to the
instructions in the H-P LaserJet IIIP Printer User’s Manual,Chapters2-4,supplied with the printer, for making any changes.
2-23
Page 38
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Page 39
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NM4TROUBLESHOOTING GUIDE
3.0TROUBLESHOOTING
This section contains information to assist the Draeger Medical, Inc. qualified
Technical Service Representative (TSR) in locating electrical faults affecting the
NARKOMED 4 monitoring and display devices. Since most troubleshooting efforts
begin with verifying power supply voltages, the following paragraphs outline the
voltage distribution scheme on the backplane along with power supply and test
connector pin identification.
Also contained in this section are troubleshooting guide flow charts that provide a
method of tracing faults to specific field replaceable assemblies or sub-assemblies in
response to observed failure modes or symptoms.
3.1Power Supply and Voltage Distribution
3.1.1In the NARKOMED 4, voltages are distributed to the processor boards
and peripheral devices from the backplane assembly. The TSR should
start the troubleshooting procedure with voltage checks at the
backplane. The wire harnesses originating at the power supply circuit
board are connected to J28, J29, and J30 on the backplane.
3.1.2These voltages can also be measured at test connector J15 on later
model backplane assemblies. The acceptable voltage levels are listed in
Table 3-1. Figure 3-1 shows the location of these connectors on the
backplane. Refer to the replacement procedures in Section 4 for
instructions on access to the backplane assembly. Be sure to observe all
cautions that are listed.
3.1.3If all the voltages are present, then ensure that all interconnecting
ribbon cables and wire harnesses between suspected assemblies are
properly seated. If all cables are properly seated, then proceed to the
troubleshooting guides.
3.1.4If any voltage is missing from backplane connectors J28, J29 or J30,
proceed to the power supply voltage measurements in Paragraph 3.1.5.
Figure 3-1: BACKPLANE CONNECTORS FOR POWER SUPPLY CABLES
Rev. A
3-3
Page 42
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TROUBLESHOOTING GUIDE (continued)NM4
3.1.5The red lamps on the power supply circuit board assembly provide
diagnostic information on the status of the power supply. Figure 3-2
shows the location of these lamps. Refer to the replacement procedures
in Section 4 for instructions on access to the power supply circuit board.
The red LED (DS2) will be lighted if any of the power supply voltages
are out of tolerance. This lamp will also be lighted if the levels of the
two backup batteries differ by more than 1.1 volt. The red LED (DS4)
will be lighted during the power up self-test period, and will be off after
the self-test is completed. This lamp will remain lighted if there is a
powerup self-testfailure of themonitoring andcommunication circuitry
on the power supply board.
The DC-DC converters supplying the 5V bus are protected by
replaceable fuses F1 and F2, and the DC-DC converters supplying the
12V bus are protected by replaceable fuses F3, F4, and F5. Figure 3-2
shows the location of these fuses on the power supply circuit board.
Measure the voltages at connectors J1, J2 and J5 of the Power Supply
Circuit Board assembly.The acceptable voltage levels are listed in
Table 3-2. Figure 3-2 shows the location of these connectors on the
circuit board.
Figure 3-2: POWER SUPPLY CIRCUIT BOARD CONNECTORS, LAMPS AND FUSES
Rev. A
3-5
Page 44
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TROUBLESHOOTING GUIDE (continued)NM4
3.2Processor Test
If a Processor related failure is reported, it will be flagged either as the "Main" or
the "Back-Up" processor board. When the System Power switch is turned ON, the
unit performs extensive self-diagnostics on its internal hardware.As the
diagnostics are performed, each test and its result (PASS - FAIL) appear on the
display. First the "Main" or upper processor board is tested and then the "BackUp" or lower processor board is tested. If the "Back-Up" processor is reported
defective, press the BACKUP key to obtain a more detailed display of what is nonfunctional on that board.
When diagnosing a processor related problem, use the BACKUP key to toggle
between processors. As an additional diagnostic aid, the green lamp on the edge
of each processor board, when lighted, indicates the presence of +5 VDC supplied
to that board. Refer to the replacement procedures Section 4 for instructions on
access to the processor boards.
3.3Troubleshooting Guide Flow Charts
Table 3-3 lists failure modes that could be detected during the power-up self test
and the service diagnostic tests. Each failure mode is keyed to a troubleshooting
guide flow chart to assist the Technical Service Representative in locating the
problem. These flow charts assume that the machine is plugged into an AC outlet
with the correct voltage, and the machine is not running on its backup battery.
Table 3-3: NARKOMED 4 TROUBLESHOOTING GUIDES
FAILURE MODECORRECTIVE ACTION
New Patient Alarm Not Displayed
Loss of O2Monitor
Loss of Breathing Pressure Monitor
Loss of GAS Monitor
Loss of Pulse Oximeter Monitor
Loss of Respiratory Volume Monitor
Loss of Blood Pressure Monitor
Touch Screen Failure
No Audio Alarms
DataScan function not Logging Data
Alarm Silence Failure
Vitalink Failure
Incorrect Display
Measure Data Incorrect
No Oxygen Ratio Monitor Alarm
No Oxygen Supply Pressure Alarm
Display Screens Blank upon System Power-Up
Power Supply Voltages Out of Tolerance
No Keypanel or Selection Dial Response
Internal Printer Not Working
GUIDE 17: Display Screens Blank upon System Power-Up
START
ARE BOTH
DISPLAY PANELS
BLANK ON SYSTEM
POWER UP?
Y
REPLACE
BACKPLANE ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.28
ARE BOTH
DISPLAY PANELS
BLANK ON SYSTEM
POWER UP?
Y
REINSTALL ORIGINAL
BACKPLANE ASSEMBLY
------------------------------------REPLACE FRONT
BEZEL ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.31
N
ARE BOTH
DISPLAY PANELS
BLANK ON SYSTEM
POWER UP
Y
REINSTALL ORIGINAL
N
FRONT BEZEL
ASSEMBLY
CONTACT NAD
SERVICE DEPT.
N
PERFORM A
COMPLETE PMS
ON THE UNIT
N
DOES UNIT
PASS PMS?
Y
UNIT IS
FUNCTIONAL
Rev. A
3-23
Page 62
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TROUBLESHOOTING GUIDE (continued)NM4
GUIDE 18: Power Supply Voltages Out of Tolerance
START
ARE
POWER SUPPLY
VOLTAGES OUT OF
TOLERANCE?
Y
REPLACE POWER
SUPPLY CIRCUIT BOARD
AS OUTLINED IN
PROCEDURE 4.25
ARE
POWER SUPPLY
VOLTAGES OUT OF
TOLERANCE?
Y
REINSTALL ORIGINAL
POWER SUPPLY
CIRCUIT BOARD
N
N
COMPLETE PMS
N
PERFORM A
ON THE UNIT
DOES UNIT
PASS PMS?
CONTACT NAD
SERVICE DEPT.
3-24
Y
UNIT IS
FUNCTIONAL
Rev. A
Page 63
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NM4TROUBLESHOOTING GUIDE (continued)
GUIDE 19: No Keypanel or Selection Dial Response
START
ARE KEYPANEL
AND SELECTION DIAL
RESPONSIVE?
N
REPLACE FRONT
BEZEL ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.31
ARE KEYPANEL
AND SELECTION DIAL
RESPONSIVE?
N
REINSTALL ORIGINAL
FRONT BEZEL ASSEMBLY
-----------------------------------REPLACE
BACKPLANE ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.28
Y
ARE KEYPANEL
AND SELECTION DIAL
RESPONSIVE
N
Y
REINSTALL ORIGINAL
BACKPLANE ASSEMBLY
CONTACT NAD
SERVICE DEPT.
Y
PERFORM A
COMPLETE PMS
ON THE UNIT
N
DOES UNIT
PASS PMS?
Y
UNIT IS
FUNCTIONAL
Rev. A
3-25
Page 64
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TROUBLESHOOTING GUIDE (continued)NM4
GUIDE 20: Internal Printer Not Working
START
CONNECT PRINTER
CABLE TO
BACKPLANE J1
DOES
INTERNAL PRINTER
FUNCTION?
N
N
IS PRINTER
CABLE
CONNECTED?
Y
REPLACE
INTERNAL PRINTER
AS OUTLINED IN
PROCEDURE 4.43
DOES
INTERNAL PRINTER
FUNCTION?
N
REINSTALL ORIGINAL
INTERNAL PRINTER
------------------------------------REPLACE
BACKPLANE ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.28
Y
DOES
INTERNAL PRINTER
FUNCTION?
N
REINSTALL ORIGINAL
BACKPLANE ASSEMBLY
Y
CONTACT NAD
SERVICE DEPT.
Y
PERFORM A
COMPLETE PMS
ON THE UNIT
N
DOES UNIT
PASS PMS?
Y
UNIT IS
FUNCTIONAL
3-26
Rev. A
Page 65
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NM4TROUBLESHOOTING GUIDE (continued)
3.4O.R. DATA MANAGER Troubleshooting
Table 3-4 lists failure modes and symptoms for the O.R. DATA MANAGER.
Those that are marked (*) in the table are messages that can appear on the
Remote Display during the power-up self test. Each failure mode or symptom
is keyed to a recommended action to assist the TSR in locating a problem.
Refer to the Replacement Procedures section for instructions on access to the
O.R. DATA MANAGER CPU assembly, cable connections and keyboard.
TABLE 3-4: O. R. DATA MANAGER FAILURE MODES AND SYMPTOM LIST
FAILURE MODE OR SYMPTOMACTION
Display Blank
*Keyboard Error or Keyboard Not Present
*Internal Diagnostic Failure upon System Power-Up
*Memory Battery Fail
*CMOS Checksum Fail
*Interrupt Controller #1 Fail
*Interrupt Controller #2 Fail
*Memory in Protected Mode Fail
*Protected Mode Fail
*Processor Exception Interrupts Fail
*Sizing System Memory 640K Not Found
*System Memory 640K Fail
*Sizing Extended Memory 00384K Not Found
*Communications Error with Host
*Disk Error
*Disk Full Error
*Disk Invalid Error
*Disk Not Inserted Error
*"B" Drive Error Messages
Printer Inoperative
-------------------------------------CHECK ORDM VIDEO
CABLE CONNECTIONS:
VIDEO INTERFACE BOARD
J3 TO BACKPLANE J14
(ALSO CHECK POWER
CONNECTIONS TO CPU
ASSEMBLY)
N
IS REMOTE
DISPLAY BLANK?
Y
REPLACE
BACKPLANE ASSEMBLY
AS OUTLINED IN
PROCEDURE4.28
IS REMOTE
DISPLAY BLANK?
Y
REINSTALL ORIGINAL
BACKPLANE ASSEMBLY
------------------------------------REPLACE ORDM
VIDEO CABLE
IS REMOTE
DISPLAY BLANK?
Y
N
N
N
Rev. A
REPLACE MAIN
PROCESSOR BOARD
N
DISPLAY BLANK?
Y
IS REMOTE
Y
REPLACE BACKUP
PROCESSOR BOARD
CONTACT NAD
SERVICE DEPT.
3-29
REINSTALL ORIGINAL
VIDEO CABLE
---------------------------------REPLACE CPU
ASSEMBLY AS
OUTLINED IN
PROCEDURE 4.44
OR 4.45
IS REMOTE
DISPLAY BLANK?
Y
REINSTALL ORIGINAL
CPU ASSEMBLY
N
UNIT IS
FUNCTIONAL
Page 68
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TROUBLESHOOTING GUIDE (continued)NM4
GUIDE 22: Keyboard Error or Keyboard Not Present
START
CHECK KEYBOARD
CABLE CONNECTIONS:
INTERNAL KEYBOARD
CABLE TO CPU BOARD J5;
ALSO CHECK FLOATING
KEYBOARD CABLE
CONNECTOR IN
MONITOR BOX
N
IS KEYBOARD
ERROR PRESENT
DURING SYSTEM
POWER-UP?
Y
IS KEYBOARD
CABLE CONNECTED
TO CPU?
Y
REPLACE
KEYBOARD
ASSEMBLY AS
OUTLINED IN
PROCEDURE 4.46
IS KEYBOARD
ERROR PRESENT
DURING SYSTEM
POWER-UP?
N
IS KEYBOARD
ERROR PRESENT
DURING SYSTEM
POWER-UP?
Y
REINSTALL
ORIGINAL CPU
ASSEMBLY
CONTACT NAD
SERVICE DEPT.
N
N
Y
REINSTALL ORIGINAL
KEYBOARD ASSEMBLY
-------------------------------------REPLACE CPU
AS OUTLINED IN
PROCEDURE 4.44 OR 4.45
3-30
UNIT IS
FUNCTIONAL
Rev. A
Page 69
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NM4TROUBLESHOOTING GUIDE (continued)
GUIDE 23: Internal Diagnostic, Interrupt Controller, or Memory Failure
START
DO ANY
POWER-UP DIAGNOSTIC
TESTS FAIL OR SET-UP
ERRORS OCCUR?
Y
REPLACE
CPU ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.44
OR 4.45
DO ANY
POWER-UP DIAGNOSTIC
TESTS FAIL OR SET-UP
ERRORS OCCUR?
Y
N
N
Rev. A
REINSTALL
ORIGINAL CPU
ASSEMBLY
CONTACT NAD
SERVICE DEPT.
UNIT IS
FUNCTIONAL
3-31
Page 70
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TROUBLESHOOTING GUIDE (continued)NM4
GUIDE 24: Communications Error with Host
START
IS "ORDM
COM ERROR" PRESENT
ON REMOTE DISPLAY
ADVISORY?
Y
SWITCH REMOTE PANEL
RELAY TO ORDM AS
OUTLINED IN PARA. 2.4.1
----------------------------------------CHECK CONFIG OF ORDM:
REF. SETUP AND
INSTALLATION SECTION OF
NM4 OPERATOR'S MANUAL
--------------------------------------RETURN RELAY TO
NM4 MODE
IS "ORDM
COM ERROR" PRESENT
ON REMOTE DISPLAY
ADVISORY?
Y
SWITCH TO
BACKUP PROCESSOR
IS "ORDM
COM ERROR" PRESENT IN
BOTH MAIN AND BACKUP
PROCESSORS?
Y
N
REPLACE
DATA CABLE
IS "ORDM
COM ERROR" PRESENT
ON REMOTE DISPLAY
ADVISORY?
Y
REINSTALL ORIGINAL
DATA CABLE
N
IS "ORDM
COM ERROR" PRESENT
IN MAIN PROCESSOR
ONLY?
N
PROCESSOR BOARD
Y
REPLACE MAIN
N
REPLACE BACKUP
PROCESSOR BOARD
--------------------------------REPLACE ORDM CPU
AS OUTLINED IN
PROCEDURE 4.44 OR 4.45
IS "ORDM
COM ERROR" PRESENT
ON REMOTE DISPLAY
ADVISORY?
Y
REINSTALL
ORIGINAL CPU
ASSEMBLY
N
N
IS INTERNAL
DATA CABLE
CONNECTED?
N
CHECK DATA CABLE
CONNECTIONS:
CPU BOARD J3
TO BACKPLANE J3
Y
IS "ORDM
COM ERROR" PRESENT
ON REMOTE DISPLAY
ADVISORY?
Y
CONTACT NAD
SERVICE DEPT.
3-32
N
CONTACT NAD
SERVICE DEPT.
UNIT IS
FUNCTIONAL
Rev. A
Page 71
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NM4TROUBLESHOOTING GUIDE (continued)
GUIDE 25: Disk Errors
START
DOES
"DISK ERROR"
FLASH ON REMOTE
DISPLAY?
N
DOES
"DISK NOT INSERTED"
FLASH ON REMOTE
DISPLAY?
N
DOES
"DISK INVALID"
FLASH ON REMOTE
DISPLAY?
REPLACE DISK
WITH A
FORMATTED
3-1/2" HIGH
DENSITY DISK
INSERT FORMATTED
DATA DISK INTO
DISK DRIVE
REPLACE DISK
WITH A
FORMATTED
3-1/2" HIGH
DENSITY DISK
DOES
"DISK ERROR"
FLASH ON REMOTE
DISPLAY?
N
DOES
"DISK NOT INSERTED"
FLASH ON REMOTE
DISPLAY?
N
DOES
"DISK INVALID"
FLASH ON REMOTE
DISPLAY?
NN
YY
YY
YY
DOES
"DISK FULL"
FLASH ON REMOTE
DISPLAY?
N
UNIT IS
FUNCTIONAL
N
"DISK GENERAL ERROR"
FLASH ON REMOTE
REPLACE DISK
WITH A
FORMATTED
3-1/2" HIGH
DENSITY DISK
DOES
DISPLAY?
Y
REINSTALL
ORIGINAL CPU
ASSEMBLY
DOES
"DISK FULL"
FLASH ON REMOTE
DISPLAY?
N
REPLACE
CPU ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.44
OR 4.45
CONTACT NAD
SERVICE DEPT.
YY
Rev. A
3-33
Page 72
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TROUBLESHOOTING GUIDE (continued)NM4
GUIDE 26: "B" Drive Error Messages
START
ARE ANY
"B" DRIVE ERRORS
SHOWN ON REMOTE
DISPLAY?
Y
REPLACE MEMORY
BATTERY AS
OUTLINED IN
PROCEDURE 4.44
ARE ANY
"B" DRIVE ERRORS
SHOWN ON REMOTE
DISPLAY?
Y
REPLACE CPU
ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.44
OR 4.45
N
N
ARE ANY
"B" DRIVE ERRORS
SHOWN ON REMOTE
DISPLAY?
Y
REINSTALL
ORIGINAL CPU
ASSEMBLY
CONTACT NAD
SERVICE DEPT.
N
3-34
UNIT IS
FUNCTIONAL
Rev. A
Page 73
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NM4TROUBLESHOOTING GUIDE (continued)
GUIDE 27: Printer Inoperative
START
CONNECT
EXTERNAL PRINTER
CABLE
CONNECT PRINTER
POWER CORD
CHECK
PRINTER CABLE
CONNECTIONS:
CPU BOARD J2 TO
BACKPLANE J13
(ALSO CHECK
SERIAL INTERFACE
BOARD J6 TO
BACKPLANE J2)
DOES
EXTERNAL PRINTER
FUNCTION?
N
N
N
EXT. PRINTER
CABLE CONNECTED
TO PRINTER
PORT?
IS EXTERNAL
PRINTER POWER CORD
CONNECTED?
IS PRINTER
INTERNAL CABLE
CONNECTED?
Y
N
IS
DOES
EXTERNAL PRINTER
FUNCTION?
Y
ORIGINAL CABLE
----------------------------REPLACE ORDM
CPU ASSEMBLY
AS OUTLINED IN
PROCEDURE 4.44
Y
EXTERNAL PRINTER
Y
N
REINSTALL
OR 4.45
DOES
FUNCTION?
N
Y
Y
Rev. A
DOES
EXTERNAL PRINTER
FUNCTION?
N
REPLACE
PRINTER
CABLE
3-35
REINSTALL
ORIGINAL ORDM
Y
CPU ASSEMBLY
CONTACT
NAD SERVICE
DEPARTMENT
UNIT IS
FUNCTIONAL
Page 74
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Page 75
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NM4REPLACEMENT PROCEDURES
4.0REPLACEMENT PROCEDURES
This section outlines removal and replacement procedures for the field-replaceable
assemblies of the NARKOMED 4 Anesthesia System.
These procedures are to be performed only by a Draeger Medical, Inc. qualified
Technical Service Representative (TSR).
The following are the only procedures authorized by Draeger Medical, Inc. to be
performed in the field. All other service procedures shall be referred to Draeger
Medical, Inc.’s Technical Service Department.
NOTE:The PMS PROCEDURE given in Section 6 must be performed
after any replacement, removal, calibration or adjustment
procedure.
Rev. H
4-1
Page 76
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REPLACEMENT PROCEDURES (continued)NM4
4.1Cylinder Yoke Assemblies
Each cylinder yoke contains a replaceable filter and check valve assembly.
Replacement of this assembly requires that the yoke be removed from the
anesthesia machine. Figure 4-1 shows a typical cylinder yoke mounting
arrangement. Access to the yoke mounting screws and gas line connection
requires that the table top be removed from the machine.
4.1.1Disconnect all pipeline hoses and set the System Power switch to ON.
4.1.2Close all cylinder valves except the O
valve.
2
4.1.3Set the oxygen flow to 5 liters per min.
4.1.4Open the other gas flow control valves to drain pressure from the
system.
4.1.5Close the O
the O
Flush valve to drain oxygen pressure from the system.
2
cylinder valve, and close the flow control valves. Press
2
4.1.6Set the System Power switch to STANDBY.
4.1.7Remove the cylinder where the yoke is to be replaced.
WARNING:Store the cylinder in a safe place and lay it on its side.
4.1.8Remove the screws holding the table top to the machine and lift out
the table top.
4.1.9Pull the writing or keyboard tray out to its fully extended position.
4.1.10Disconnect the gas line fitting at the yoke and remove the two yoke
mounting screws.
4.1.11Remove the filter and check valve assembly from the yoke and install
a replacement assembly.
If the entire yoke assembly is being replaced, verify that the pin
indexing arrangement and the label are in agreement with the gas
designation stamped on the mounting surface of the yoke. Refer to
the parts list in Section 8.
NOTE:If the yoke spacer is removed from the frame rail of the machine, be
sure to re-install it in its original position.
4-2
Rev. A
Page 77
YOKE
ASSEMBLY
(TYPICAL)
FILTER AND
CHECK VALVE
ASSEMBLY
GAS
LINE
YOKE
SPACER
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NM4REPLACEMENT PROCEDURES (continued)
Figure 4-1: CYLINDER YOKE ASSEMBLY
Rev. H
4-3
Page 78
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REPLACEMENT PROCEDURES (continued)NM4
4.1.12Position the yoke on the spacer, and install the two mounting screws
and lockwashers. Tighten the screws securely. Connect the gas line
fitting to the yoke.
4.1.13If a new cylinder is being installed, remove the old sealing washer
from the gas inlet of the yoke and install a new washer.
4.1.14Install the correct cylinder in the yoke, making sure that the index
pins are properly engaged before tightening the handle bolt. The
cylinder should hang vertically after the handle is tight.
4.1.15Perform the following leak test on the yoke assembly:
4.1.15.1Open the cylinder valve and check for a pressure
indication on the corresponding gauge at the gas
instrumentation panel.
NOTE:The cylinder used for this test must
containthe following minimum pressure at
70°F (21°C):
O
N
O
CO
: 1000 Psi
2
O:600 Psi
2
+He : 1000 Psi
2
:600 Psi
2
AIR: 1000 Psi
4.1.15.2Close the cylinder valve and remove the cylinder fromthe
yoke.
4.1.15.3For any gas, the pressure should not drop more than 50
Psi in two minutes.
4.1.16Re-install the cylinder in the yoke.
4.1.17Replace the table top and its retaining screws.
4.1.18Replace the pipeline hoses.
4.1.19Perform the PMS Procedure given in Section 6.
4-4
Rev. A
Page 79
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NM4REPLACEMENT PROCEDURES (continued)
4.2Cylinder Pressure Regulators
Access to the cylinder pressure regulators requires that the table top be
removed from the anesthesia machine. Figure 4-2 shows the mounting
arrangement of the regulators and typical connections.
4.2.1Disconnect all pipeline hoses and set the System Power switch to ON.
4.2.2Close all cylinder valves except the O
valve.
2
4.2.3Set the oxygen flow to 5 liters per min.
4.2.4Open the other gas flow control valves to drain pressure from the
system.
4.2.5Close the O
the O
Flush valve to drain oxygen pressure from the system.
2
cylinder valve, and close the flow control valves. Press
2
4.2.6Set the System Power switch to STANDBY.
4.2.7Remove the cylinder corresponding to the regulator to be replaced.
4.2.8Remove the screws holding the table top to the machine and lift out
the table top.
4.2.9Remove the top drawer from the cabinet and pull the writing or
keyboard tray out to its fully extended position.
4.2.10Disconnect the three compression fittings at the regulator.
4.2.11Loosen the two setscrews holding the regulator to its mounting
bracket and remove the regulator.
Rev. A
4.2.12Record the serial number of the regulator that was removed, and
record the serial number of the replacement regulator.
NOTE:If fittings must be installed in the replacement regulator, use Loctite
#271 (red). Refer to the parts list in Section 8.
NOTE:For Canadian machines, verify that the correct relief valve is
installed in the regulator. Refer to the parts list in Section 8 for CSA
items.
4.2.13Position the replacement regulator in its mounting bracket, and
connect the three compression fittings. Do not tighten the fittings yet.
4-5
Page 80
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REPLACEMENT PROCEDURES (continued)NM4
TOP VIEW OF NARKOMED 4
WITH TABLE TOP REMOVED
O CYLINDER
2
PRESSURE
REGULATOR
SET
SCREWS
N O CYLINDER
2
PRESSURE
REGULATOR
AIR OR OPTIONAL
3RD GAS CYLINDER
PRESSURE REGULATOR
TEST GAUGE
CONNECTION
(TYPICAL)
CPR
Figure 4-2: CYLINDER PRESSURE REGULATORS
4-6
SIDE VIEW
ADJUSTMENT
SCREW
ACORN NUT
Rev. H
Page 81
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NM4REPLACEMENT PROCEDURES (continued)
4.2.14Tighten the regulator mounting setscrews to a torque of 50 to 55 in.
lbs.
4.2.15Tighten the compression fittings.
4.2.16Locate the TEE fitting in the ¼ in. diameter regulator output line,
and remove the plug from the TEE fitting.
4.2.17Set the regulator output pressure in accordance with the Cylinder
Pressure Regulator Adjustment given in Section 5.
4.2.18Perform the following leak test on the high pressure side of the
regulator:
4.2.18.1Open the cylinder valve and check for a pressure
indication on the corresponding gauge at the gas
instrumentation panel.
NOTE:The cylinder used for this test must
containthe following minimum pressure at
70°F (21°C):
O
N
O
CO
: 1000 Psi
2
O:600 Psi
2
+He : 1000 Psi
2
:600 Psi
2
AIR: 1000 Psi
4.2.18.2Close the cylinder valve and remove the cylinder fromthe
yoke.
4.2.18.3For any gas, the pressure should not drop more than 50
Psi in two minutes.
4.2.19Re-install the cylinder in the yoke.
4.2.20Replace the table top and its retaining screws.
4.2.21Replace the top drawer in the cabinet.
4.2.22Connect the pipeline hoses.
Rev. A
4.2.23Perform the PMS Procedure given in Section 6.
4-7
Page 82
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REPLACEMENT PROCEDURES (continued)NM4
4.3Cylinder Cutoff Valves (Canada)
Access to the cylinder cutoff valves requires removal of the table top from the
anesthesia machine. Figure 4-3 shows the locations of the O
andN
Ocutoff valve assemblies. The instructions apply toall threeassemblies.
2
, Air or 3rd gas,
2
On earlier machines the tubing arrangement may be slightly different from
that illustrated.
NOTE: Replacement of the O
Cutoff Valve Assembly shall be performed every
2
24 months. Documentation shall be created by the service person and a copy
distributed to the owner institution. Testing of the O
Cutoff Valve shall be
2
performed at each PMS. (Perform the flow test given at the end of the
following procedure)
4.3.1Disconnect all pipeline hoses and set the System Power switch to ON.
4.3.2Close all cylinder valves except the O
valve.
2
4.3.3Set the oxygen flow to 5 liters per min.
4.3.4Open the other gas flow control valves to drain pressure from the
system.
4.3.5Close the O
the O
Flush valve to drain oxygen pressure from the system.
2
cylinder valve, and close the flow control valves. Press
2
4.3.6Set the System Power switch to STANDBY.
4.3.7Remove the screws holding the table top to the machine and lift out
the table top.
4.3.8Remove the top drawer from the cabinet and pull the writing or
keyboard tray out to its fully extended position.
4.3.9Disconnect the compression fittings indicated at points marked C on
the illustration.
4.3.10Cut the tie-wrap clamp and disconnect the flexible tubing from the
cutoff valve assembly at the point marked A on the illustration.
NOTE:On later machines with assemblies that have brass fittings instead
of nylon, the flex tubing is attached with a press-on hose clamp
instead of a tie strap.
4.3.11Remove the cylinder cutoff assembly.
4.3.12Connect the flexible tubing to the replacement cutoff valve assembly
and secure it with a new tie-wrap clamp.
4-8
Rev. D
Page 83
SV50526
O2 CYLINDER
CUTOFF VALVE
ASSEMBLY
AIR OR 3RD GAS
CYLINDER
CUTOFF VALVE
ASSEMBLY
N2O CYLINDER
CUTOFF VALVE
ASSEMBLY
A
C
C
C
A
C
C
C
C
A
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NM4REPLACEMENT PROCEDURES (continued)
Figure 4-3: CYLINDER CUTOFF VALVES (CANADA)
Rev. H
4-9
Page 84
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REPLACEMENT PROCEDURES (continued)NM4
4.3.13Connect and tighten the compression fittings at points marked C on
the illustration.
4.3.14Perform the following test: --Remove the plug from the test gauge
connection at the Tee fitting in the regulator outlet piping, and install
a test gauge.
NOTE:The cylinders used for this test must contain the following minimum
pressure:O
O
: 1000 PSIAIR: 1000 PSI
2
+He : 1000 PSIN2O: 745 PSI
2
--Set the System Power switch to ON.
--For the O
cutoff valve: open the O2cylinder valve and set the oxygen flow to
2
4 liters per min.
--For the N
O cutoff valve: open the O2cylinder valve and the N2O cylinder
2
valve. Set each flow to 4 liters per min.
--Verify that regulator outlet pressure is between 43 and 49 PSI.
--Connect the pipeline hoses and pressurize to 50 PSI.
--Turn off the pipeline supply and observe the pipeline pressure gauge.
--The cutoff valve shall open when the pipeline pressure drops through the
range of 45 to 40 PSI.
--Close the cylinder valve(s), and close the flow control valve(s).
--Disconnect test pressure gauge and reinstall the plug in the regulator outlet
piping.
4.3.15Replace the table top and its retaining screws.
4.3.16Replace the top drawer in the cabinet.
4.3.17Connect the pipeline hoses.
4.3.18Perform the PMS Procedure given in Section 6.
O
Flow Test:
2
--Disconnect all pipeline supplies.
--Install a full O2cylinder on the machine, and open the cylinder valve.
--Turn the System Power switch to ON.
--Set the Inspiratory Flow control to maximum high, and turn the ventilator switch to ON.
--Set the oxygen flow to 10 l/min.
--Verify that the oxygen flow does not drop below 8 l/min. while the ventilator is running.
--Press and hold the O2FLUSH button while observing the O2flowmeter, and verify that the
oxygen flow does not drop below 8 l/min.
--If the oxygen flow in either of the above two steps drops below 8 l/min., replace the O2cutoff
valve assembly.
4-10
Rev. D
Page 85
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NM4REPLACEMENT PROCEDURES (continued)
4.4Cylinder and Pipeline Pressure Gauges
Replacement of the cylinder and pipeline pressure gauges requires that the
plexiglass front cover be removed from the gas instrumentation panel, and also
the rear cover for access to the gauge connections. Figure 4-4 shows
disassembly and mounting details.
4.4.1Disconnect all pipeline hoses and set the System Power switch to ON.
4.4.2Close all cylinder valves except the O
valve.
2
4.4.3Set the oxygen flow to 5 liters per min.
4.4.4Open the other gas flow control valves to drain pressure from the
system.
4.4.5Close the O
the O
Flush valve to drain oxygen pressure from the system.
2
cylinder valve, and close the flow control valves. Press
2
4.4.6Set the System Power switch to STANDBY.
4.4.7Remove the screws holding the rear cover, and remove the cover.
4.4.8Remove the screws holding the table top to the machine and lift out
the table top.
4.4.9AEarly models: Remove the two screws (from the back) holding the
front plate at the top of the plexiglass cover. Hold the front plate as
the screws are removed from the back.
4.4.9BLater models (without the O
O ratio alarm lamp): Remove the six
2/N2
screws holding the flowmeter shield and vapor box cover panel, and
remove the panel.
Rev. A
4.4.10Remove the flow control knobs. Each knob has two setscrews.
NOTE:If a knob must be rotated to allow access to a setscrew,
carefully note its position so that it can be re-assembled
in the same position with the "Off Stop" properly set.
4.4.11Remove the two screws holding the knob guard in place, and remove
the knob guard.
4.4.12Remove the three screws holding the plexiglass cover over the flow
NOTE:Intermediate assemblies may need to beremoved to allow
access to the gauge connections and mounting hardware.
Be sure to keep a record of the disassembly sequence so
that all tubing can be correctly re-assembled.
4.4.13A For the cylinder pressure gauges:
Disconnect the compression fitting at the back of the gauge.
Remove the gauge mounting nuts, and remove the gauge from
the front of the panel.
Install the replacement gauge in the panel using the flat
washers, lock washers and mounting nuts that were previously
removed.
Connect the gas line to the gauge and tighten the compression
fitting.
4.3.13B For the pipeline pressure gauges:
Locate the flexible tubing connecting the gauge to the pipeline
inlet assembly, cut the tie-wrap tubing clamp at the pipeline
inlet and disconnect the tubing.
NOTE:On later machines that havebrass fittings instead
of nylon, the flex tubing is attached with a presson hose clamp instead of a tie strap.
Remove the gauge mounting nuts, and remove the gauge from
the front of the panel.
Cut the tie-wrap tubing clamp and disconnect the flexible tubing
from the gauge.
Connect a new 7-inch length of tubing (8-inch for the air pipeline
pressure gauge) to the replacement gauge and secure it with a
new tie-wrap clamp.
Place the gauge in the panel and secure it with the flat washers,
lock washers and mounting nuts that were previously removed.
Rev. C
Connect the other end of the flexible tubing to the pipeline inlet
assembly and secure it with a tie-wrap clamp.
4.4.14If a cylinder pressure gauge was replaced, perform the following leak
test:
4-13
Page 88
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REPLACEMENT PROCEDURES (continued)NM4
4.4.14.1Open the cylinder valve and check for a pressure
indication on the corresponding gauge at the gas
instrumentation panel.
NOTE:The cylinder used for this test must
containthe following minimum pressure at
70°F (21°C):
O
N
O
CO
: 1000 Psi
2
O:600 Psi
2
+He : 1000 Psi
2
:600 Psi
2
AIR: 1000 Psi
4.4.14.2Close the cylinder valve and remove the cylinder fromthe
yoke.
4.4.14.3For any gas, the pressure should not drop more than 50
Psi in two minutes.
4.4.15Re-install the cylinder in the yoke.
4.4.16Place the plexiglass cover over the gauges and flow tubes, and install
the three screws near the top of the cover. Do not over-tighten these
screws as the plexiglass may crack.
4.4.17Place the knob guard over the flow control valves and install its two
retaining screws.
4.4.18Install the flow control knobs and tighten their setscrews. If the
knobs are installed properly, their labels will be straight when the
knobs are against their clockwise stops.
4.4.19Replace the front plate at the top of the plexiglass cover and secure
it with the hardware that was previously removed.
4.4.20Replace the rear cover and its retaining screws.
4.4.21Replace the table top and its retaining screws.
4.4.22Connect the pipeline hoses.
4.4.23Perform the PMS Procedure given in Section 6.
4-14
Rev. A
Page 89
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NM4REPLACEMENT PROCEDURES (continued)
4.5Flowmeters
The flowmeter tubes are held by compression in gaskets at the top and bottom
of each tube. Each upper gasket is seated in an adjustable retainer that allows
removal of the tube as shown in Figure 4-5. Access to the flow tubes and their
retainers requires removal of the plexiglass cover on the gas instrumentation
panel.
4.5.1Disconnect all pipeline hoses and set the System Power switch to ON.
4.5.2Close all cylinder valves except the O
valve.
2
4.5.3Set the oxygen flow to 5 liters per min.
4.5.4Open the other gas flow control valves to drain pressure from the
system.
4.5.5Close the O
the O
Flush valve to drain oxygen pressure from the system.
2
cylinder valve, and close the flow control valves. Press
2
4.5.6Set the System Power switch to STANDBY.
4.5.7Remove the screws holding the table top to the machine and lift out
the table top.
4.5.8Early models: Remove the rear flowmeter housing cover.
4.5.9AEarly models: Remove the two screws (from the back) holding the
front plate at the top of the plexiglass cover. Hold the front plate as
the screws are removed from the back.
4.5.9BLater models (without the O
O ratio alarm lamp): Remove the six
2/N2
screws holding the flowmeter shield and vapor box cover panel, and
remove the panel.
Rev. A
4.5.10Remove the flow control knobs. Each knob has two setscrews.
NOTE:If a knob must be rotated to allow access to a setscrew,
carefully note its position so that it can be re-assembled
in the same position with the "Off Stop" properly set.
4.5.11Remove the two screws holding the knob guard in place, and remove
the knob guard.
4.5.12Remove the three screws holding the plexiglass cover over the flow
tubes and gauges, and carefully remove the cover.
4-15
Page 90
FLOW TUBE
RETAINER SCREW
UPPER FLOW
TUBE RETAINER
FLOW TUBE
LIGHTING CHANNEL
FLOW
RESTRICTOR
SV40605
GASKET
GUIDE RING
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REPLACEMENT PROCEDURES (continued)NM4
Figure 4-5: FLOWMETERS
4-16
Rev. H
Page 91
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NM4REPLACEMENT PROCEDURES (continued)
4.5.13Loosen the screw directly above the flowmeter tube to be replaced.
Turning the screw counter clockwise will raise the upper flow tube
retainer. Raise the retainer far enough to be able to pull the top of
the tube outward, and remove the tube.
NOTE:If the bottom of the tube is seated in a flow restrictor, be
sure that the arrangement of the restrictor and its
gaskets is not disturbed.
4.5.14Make sure that the replacement flow tube bears the correct markings
and has a ball.
4.5.15Place the bottom of the flowmeter tube into the guide ring of the
lower gasket seal, and position the top of the flow tube into the center
guide ring of the top gasket seal. It will be easier to hold the tube if
the adjacent lighting channel is pulled forward and temporarily
removed.
CAUTION: The flowmeter tube must be properly centered over the
guide rings or damage to the flowmeter tube may occur.
4.5.16Ensure that the markings on the flow tube are facing forward, and
turn the upper retainer screw clockwise until the flow tube is firmly
held in place.
CAUTION: Do not over-tighten the screw as the flowmeter tube may
break.
4.5.17Perform the following leak test on the system:
4.5.17.1Disconnect the absorber hose from the freshgas outlet.
4.5.17.2Connect a test gauge and B.P. bulb to the freshgas outlet,
and pressurize the system to 50 cm H
4.5.17.3The pressure should not drop more than 10 cm H
O.
2
Oin
2
thirty seconds.
4.5.18Disconnect the test gauge and re-connect the absorber hose to the
freshgas outlet.
Rev. A
4.5.19Replace any lighting channels that were previously removed.
4-17
Page 92
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REPLACEMENT PROCEDURES (continued)NM4
4.5.20Place the plexiglass cover over the gauges and flow tubes, and install
the three screws near the top of the cover. Do not over-tighten these
screws as the plexiglass may crack.
4.5.21Place the knob guard over the flow control valves and install its two
retaining screws.
4.5.22Install the flow control knobs and tighten their setscrews. If the
knobs are installed properly, their labels will be straight when the
knobs are against their clockwise stops.
4.5.23Replace the front plate at the top of the plexiglass cover and secure
it with the hardware that was previously removed.
4.5.24If applicable, replace the rear flowmeter housing cover.
4.5.25Replace the table top and its retaining screws.
4.5.26Connect the pipeline hoses.
4.5.27Perform the PMS Procedure given in Section 6.
4-18
Rev. A
Page 93
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NM4REPLACEMENT PROCEDURES (continued)
4.6Flow Control Valves
The flow control valves have replaceable elements that are removable from the
front of the gas instrumentation panel as shown in Figure 4-6. Each flow
control knob has a clockwise positive stop arrangement that prevents damage
to the valve seat. Whenever a valve cartridge is replaced, the "off stop" must
be set as outlined in the following procedure.
4.6.1Disconnect all pipeline hoses and set the System Power switch to ON.
4.6.2Close all cylinder valves except the O
valve.
2
4.6.3Set the oxygen flow to 5 liters per min.
4.6.4Open the other gas flow control valves to drain pressure from the
system.
4.6.5Close the O
Flush valve to drain oxygen pressure from the system.
O
2
cylinder valve and the O2flow control valve. Press the
2
4.6.6Set the System Power switch to STANDBY.
4.6.7Remove the flow control knobs.
4.6.8Remove the two screws holding the knob guard in place, and remove
the knob guard.
4.6.9Remove the stop pin nut.
4.6.10Remove the flow control valve by holding it at the wrench flats and
turning it counter-clockwise.
4.6.11Install the replacement flow control valve in the valve body.
Rev. A
CAUTION: Before tightening the cartridge, rotate the valve shaft
several turns counter-clockwise to prevent bottoming the
valve element into the seat when the cartridge is
tightened.
4.6.12Replace the stop pin nut.
4.6.13Replace the knob guard and secure it with the two mounting screws.
4-19
Page 94
VALVE
HOUSING
FLOW CONTROL
VALVE
WRENCH
FLATS
KNOBLABEL
SV20606
STOP PIN
NUT
KNOB GUARD
(NEW STYLE)
KNOB GUARD
(OLD STYLE)
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REPLACEMENT PROCEDURES (continued)NM4
Figure 4-6: FLOW CONTROL VALVES
4-20
Rev. H
Page 95
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NM4REPLACEMENT PROCEDURES (continued)
4.6.14Set the System Power switch to ON.
4.6.15A For the O
flow control valve:
2
Open the oxygen cylinder valve.
Turn the flow control valve clockwise until the flow rate will not
drop any further. (If the machine has been modified to eliminate
the minimum flow feature, turn the valve until the flow rate is
zero.)
4.6.15B For the other gas flow control valves:
Open the oxygen cylinder valve, and open the cylinder valve
corresponding to the flow control valve replacement.
Set the oxygen flow rate to four liters per minute.
Turn the other gas flow control valve clockwise until the flow
rate is zero.
4.6.16Place the knob on the flow control valve shaft and turn it clockwise
until it engages the stop pin. Tighten one of the knob setscrews.
4.6.17Turn the knob in both directions and ensure that the flow can be
controlled over its entire range. When the valve is closed, the knob
should be against the clockwise stop. Tighten theremaining setscrew.
4.6.18If the knob label is not horizontal when the valve is closed, remove
the label and install a new label in the correct position.
4.6.19Connect the pipeline hoses.
4.6.20Perform the PMS Procedure given in Section 6.
The oxygen supply failure protection devices (failsafe assemblies) are located
behind the gas instrumentation panel. Access to these assemblies requires
removal of the rear cover. For earlier machines, replacement assemblies are
supplied with all hardware out to the first compression fitting in each line.
On later machines with flowmeter assemblies having an Oxygen Ratio
Controller (ORC), failsafe assemblies have an additional inlet port that allows
both pipeline and cylinder supplies to be connected directly to the failsafe
assemblies. Figure 4-7 shows the arrangement for both types of assemblies.
4.7.1Disconnect all pipeline hoses and set the System Power switch to ON.
4.7.2Close all cylinder valves except the O
valve.
2
4.7.3Set the oxygen flow to 5 liters per min.
4.7.4Open the other gas flow control valves to drain pressure from the
system.
4.7.5Close the O
Flush valve to drain oxygen pressure from the system.
O
2
cylinder valve and the O2flow control valve. Press the
2
4.7.6Set the System Power switch to STANDBY.
4.7.7Remove the screws holding the rear cover, and remove the cover.
4.7.8Cut the tie-wrap clamp on the flexible O
control line, and disconnect
2
the flexible tube.
NOTE:On later machines with assemblies that have brass fittings instead
of nylon, the flex tubing is attached with a press-on hose clamp
instead of a tie strap.
4.7.9Disconnect the compression fittings at the side ports and at the check
valve, and remove the assembly.
NOTE:If fittings must be installed in the replacement block assembly, use
Loctite #271 (red). See parts list in Section 8.
4.7.10Install the replacement failsafeassembly, and tightenall compression
fittings.
4.7.11Connect the flexible tubing to the control port, and install a new tiewrap clamp.
4-22
Rev. C
Page 97
SV70101
O2 CONTROL LINE
EARLIER DESIGN SUPPLIED
WITH FITTINGS
OXYGEN SUPPLY
FAILURE PROTECTION
DEVICE (N2O CONTROL
DEVICE ILLUSTRATED)
The oxygen supply pressure alarm switch is located behind the gas
instrumentation panel. Access to the switch requires removal of the flowmeter
housing rear cover. The replacement switch must be tested to ensure that its
operating point is set correctly. Figure 4-8 shows the switch assembly on
earlier machines where the switch is supported by the O
tubing.
2
On later machines with flowmeter assemblies having an Oxygen Ratio
Controller (ORC), the oxygen supply pressure alarm switch is part of the alarm
channel assembly. Refer to the procedure titled "Alarm Channel and Oxygen
Supply Pressure Alarm Switch" for specific replacement instructions.
4.8.1Disconnect all pipeline hoses and set the System Power switch to ON.
4.8.2Close all cylinder valves except the O
valve.
2
4.8.3Set the oxygen flow to 5 liters per min.
4.8.4Open the other gas flow control valves to drain pressure from the
system.
4.8.5Close the O
Flush valve to drain oxygen pressure from the system.
O
2
cylinder valve and the O2flow control valve. Press the
2
4.8.6Set the System Power switch to STANDBY.
4.8.7Remove the screws holding the rear cover, and remove the cover.
4.8.8Disconnect the two compression fittings at the TEE.
4.8.9Note the position of the wires on the switch so that the replacement
unit can be connected in the same manner. Disconnect the wires from
the switch and remove the assembly.
4.8.10Connect the wires to the replacement assembly; connect and tighten
the compression fittings on the O
lines.
2
Rev. A
4.8.11Remove the screws holding the table top to the machine and lift out
the table top.
4.8.12Pull the writing or keyboard tray out to its fully extended position.
4.8.13Locate the TEE fitting in the ¼ in. diameter output line of the O
regulator and remove the plug from the TEE fitting.
4.8.14Connect a dedicated O
test gauge to the TEE fitting.
2
4-25
2
Page 100
OXYGEN SUPPLY
PRESSURE
ALARM SWITCH
O LINES
2
ALARM
WIRES
ADJUSTMENT
WHEEL
REAR VIEW, FLOWMETER HOUSING
WITH REAR COVER REMOVED
INCREASE
SETPOINT
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REPLACEMENT PROCEDURES (continued)NM4
Figure 4-8: OXYGEN SUPPLY PRESSURE ALARM SWITCH
4-26
OSPAS
Rev. H
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