Nellcor OXIMAX N-595 User manual

N-595
Pulse Oximeter
Service Manual

This ISM device complies with Canadian ICES-001.
Cet appareil ISM est conforme à la norme NMB-001 Canada.
Nellcor Puritan Bennett Inc. is an affiliate of Tyco Healthcare. Nellcor, Oxiband, Durasensor, OxiCliq, Dura-Y,
Max-Fast and OXIMAX are trademarks of Nellcor Puritan Bennett Inc.
To obtain information about a warranty, if any, contact Nellcor’s Technical Services Department, or your local
representative.
Purchase of this instrument confers no express or implied license under any Nellcor Puritan Bennett patent to
use the instrument with any sensor that is not manufactured or licensed by Nellcor Puritan Bennett.
Covered by one or more of the following U.S. Patents and foreign equivalents: 4,621,643; 4,653,498; 4,700,708;
4,770,179; Re. 35,122; 4,802,486; 4,869,254; 4,928,692; 4,934,372; 5,078,136; 5,351,685; 5,368,026; 5,485,847;
5,533,507; 5,662,106; and 5,853,364.

N-595 i
Contents
Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .v
Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Warnings ............................................................................................................... 1
Cautions ................................................................................................................ 2
Manual Overview .................................................................................................. 2
Description of N-595 Monitor ................................................................................ 3
Front Panel .................................................................................................4
Rear Panel ................................................................................................. 4
Softkey Menu ............................................................................................. 5
Related Documents ..............................................................................................8
Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Cleaning ................................................................................................................ 9
Periodic Safety Checks ......................................................................................... 9
Functional Checks ................................................................................................9
Battery ................................................................................................................ 10
Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Introduction .........................................................................................................11
Equipment Needed .............................................................................................11
Performance Tests .............................................................................................11
Battery Charge ......................................................................................... 12
Power-Up Performance ............................................................................12
Operational Setup ....................................................................................17
General Operation ....................................................................................24
Pulse Oximetry Functional Tests ..............................................................26
Safety Tests ........................................................................................................33
Power-On Settings and Service Functions . . . . . . . . . . . . . . . . . . . . . . . 35
Introduction .........................................................................................................35
Power-On Settings ..............................................................................................35
Factory Default Settings .....................................................................................35
Neonate Default Settings .........................................................................35
Adult Default Settings ...............................................................................37
Service Functions ...............................................................................................37
Accessing the Service Functions ............................................................. 38
Exit Softkey ..............................................................................................39
Next Softkey .............................................................................................39
Param Softkey Menu ................................................................................ 40
Print Softkey Menu ...................................................................................41
Next Softkey Menu ...................................................................................45
Setting Institutional Defaults (Sample) ................................................................47

Contents
ii
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Introduction .........................................................................................................51
How To Use This Section ................................................................................... 51
Who Should Perform Repairs .............................................................................51
Troubleshooting Guide .......................................................................................51
Power ....................................................................................................... 53
Buttons ..................................................................................................... 54
Display/Alarms ......................................................................................... 55
Operational Performance .........................................................................56
Data Port ..................................................................................................57
Error Codes ........................................................................................................57
Other Messages ....................................................................................... 60
Disassembly Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Introduction .........................................................................................................63
Replacement Level Supported ........................................................................... 63
Prior to Disassembly ........................................................................................... 64
Fuse Replacement ..............................................................................................64
Monitor Disassembly .......................................................................................... 65
Monitor Assembly ............................................................................................... 66
Battery Replacement .......................................................................................... 67
Removal ................................................................................................... 67
Replacement ............................................................................................68
Power Entry Module (PEM) Removal/Replacement ...........................................68
Removal ................................................................................................... 68
Replacement ............................................................................................69
Power Supply Removal/Replacement ................................................................ 70
Removal ................................................................................................... 70
Replacement ............................................................................................71
Cooling Fan Removal/Replacement ................................................................... 72
Removal ................................................................................................... 72
Replacement ............................................................................................73
Display PCB Removal/Replacement ..................................................................74
Removal ................................................................................................... 74
Replacement ............................................................................................75
User Interface PCB Removal/Replacement ....................................................... 76
Removal ................................................................................................... 76
Replacement ............................................................................................77
Alarm Speaker Removal/Replacement ............................................................... 78
Removal ................................................................................................... 78
Replacement ............................................................................................79
Top Case Assembly Removal/Replacement ......................................................80
Removal ................................................................................................... 80
Replacement ............................................................................................80
Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Introduction .........................................................................................................81
Obtaining Replacement Parts .............................................................................81
Parts List ............................................................................................................. 82
Packing for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Introduction .........................................................................................................85
Returning the N-595 ...........................................................................................85

Contents
N-595 iii
General Instructions ............................................................................................ 85
Repacking in Original Carton ..............................................................................85
Repacking in a Different Carton .......................................................................... 87
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Performance .......................................................................................................89
Electrical .............................................................................................................90
Environmental Conditions ................................................................................... 90
Physical Characteristics ......................................................................................92
Compliance .........................................................................................................93
Manufacturer’s Declaration ................................................................................. 95
Safety Tests ......................................................................................................101
Ground Integrity ......................................................................................101
Earth Leakage Current ...........................................................................102
Enclosure Leakage Current ....................................................................102
Patient Applied Risk Current ..................................................................102
Patient Isolation Risk Current .................................................................104
Data Port Interface Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Introduction .......................................................................................................105
Configuring the Data Port .................................................................................105
Communication Baud Rate ....................................................................106
Communication Protocol ........................................................................107
Language Selection ................................................................................108
Nurse Call Setup ....................................................................................109
Analog Calibration Setup ........................................................................110
Agilent (HP) Communications ................................................................111
SpaceLabs Communications ..................................................................111
Marquette Communications ...................................................................112
Datex-Ohmeda Communications ...........................................................113
Connecting to the Data Port .............................................................................113
Communication With a PC ................................................................................ 115
Dump Instrument Info (Option 1) ............................................................115
Set Date and Time (Option 2) ................................................................115
Dump Trend (Option 3) ..........................................................................116
Dump Error Log (Option 4) .....................................................................116
Exit Interactive Mode (Option 5) .............................................................116
Using Data on the PC .......................................................................................116
Real-Time Printout ............................................................................................117
Column Heading .....................................................................................118
Patient Data and Operating Status .........................................................119
Trend Data Printout (ASCII Mode) .................................................................... 121
Trend Printout (Graph Mode) ............................................................................121
Nurse Call .........................................................................................................122
Analog Output ................................................................................................... 123
Technical Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Oximetry Overview ........................................................................................... 125
Functional versus Fractional Saturation .................................................125
Measured versus Calculated Saturation ................................................126
SatSeconds Alarm Management ...................................................................... 126
Reads Through Motion .....................................................................................127
OXIMAX Technology ........................................................................................ 127
Block Diagram Theory ......................................................................................128

Contents
iv
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Contents
N-595 v
Figures
Figure 1: N-595 Front Panel ......................................................................... 4
Figure 2: N-595 Rear Panel ..........................................................................4
Figure 3: SRC-MAX OXIMAX Oximetry Tester ..........................................26
Figure 4: Fuse Removal .............................................................................64
Figure 5: Corner Screws ............................................................................. 65
Figure 6: Separating Case Halves ..............................................................66
Figure 7: Removing the Battery .................................................................. 67
Figure 8: Power Entry Module ....................................................................69
Figure 9: Power Supply ..............................................................................71
Figure 10: Cooling Fan .................................................................................73
Figure 11: Display PCB ................................................................................ 75
Figure 12: User Interface PCB .....................................................................77
Figure 13: Alarm Speaker .............................................................................79
Figure 14: Exploded View .............................................................................83
Figure 15: Packing ........................................................................................86
Figure 16: Data Port Pin Layout ................................................................. 114
Figure 17: Real-Time Printout ....................................................................117
Figure 18: Trend Data Printout (ASCII Mode) ............................................121
Figure 19: Monitor Trend Data Printout (Graph Mode) ...............................122
Figure 20: Sensor Event Record Printout (Graph Mode) ...........................122
Figure 21: Oxyhemoglobin Dissociation Curve ..........................................126
Figure 22: Block Diagram ...........................................................................128
Figure 23: Main PCB Schematic Diagram (Sheet 1 of 13) .........................131
Figure 24: Main PCB Schematic Diagram (Sheet 2 of 13) .........................133
Figure 25: Main PCB Schematic Diagram (Sheet 3 of 13) .........................135
Figure 26: Main PCB Schematic Diagram (Sheet 4 of 13) .........................137
Figure 27: Main PCB Schematic Diagram (Sheet 5 of 13) .........................139
Figure 28: Main PCB Schematic Diagram (Sheet 6 of 13) .........................141
Figure 29: Main PCB Schematic Diagram (Sheet 7 of 13) .........................143
Figure 30: Main PCB Schematic Diagram (Sheet 8 of 13) .........................145
Figure 31: Main PCB Schematic Diagram (Sheet 9 of 13) .........................147
Figure 32: Main PCB Schematic Diagram (Sheet 10 of 13) .......................149
Figure 33: Main PCB Schematic Diagram (Sheet 11 of 13) .......................151
Figure 34: Main PCB Schematic Diagram (Sheet 12 of 13) .......................153
Figure 35: Main PCB Schematic Diagram (Sheet 13 of 13) .......................155
Figure 36: Main PCB Assembly Drawing (Front View) ...............................157
Figure 37: Main PCB Assembly Drawing (Rear View) ...............................159
Figure 38: Linear Power Supply Schematic Diagram .................................161
Figure 39: Linear Power Supply Assembly Drawing ..................................163

Contents
vi
Tables
Table 1: Equipment Needed ...................................................................... 11
Table 2: Neonate Alarm Limit Factory Defaults .........................................35
Table 3: Adult Alarm Factory Defaults ....................................................... 37
Table 4: Problem Categories ..................................................................... 52
Table 5: Power Problems ..........................................................................53
Table 6: Button Problems .......................................................................... 54
Table 7: Display/Alarms Problems ............................................................ 55
Table 8: Operational Performance Problems ............................................56
Table 9: Data Port Problems .....................................................................57
Table 10: Error Codes .................................................................................58
Table 11: Power Supply Lead Connections ................................................71
Table 12: Parts List .....................................................................................82
Table 13: Electromagnetic Emissions .........................................................95
Table 14: Electromagnetic Immunity ...........................................................96
Table 15: Electromagnetic Immunity, Portable RF Equipment .................... 98
Table 16: Recommended Separation Distances .........................................99
Table 17: Cables .......................................................................................100
Table 18: Data Port Pin Outs ....................................................................113
Table 19: Operating Status Codes ............................................................120
Table 20: Nurse Call Relay Pin States ......................................................123
Table 21: Rating of Nurse Call Relay ........................................................123

N-595 1
Introduction
Warnings
Warnings are identified by the WARNING symbol shown above.
Warnings alert the user to potential serious outcomes (death, injury, or adverse
events) to the patient or user.
WARNING: The sensor extrapolates from the date and time provided by the
N-595 when recording the sensor event record to the sensor. The accuracy of
the date/time is the responsibility of the N-595. It is recommended that the
N-595 user set the time/date to the correct value before a sensor event
record-enabled sensor is connected, and that this date/time not be changed
while the sensor remains connected. Since a sensor with sensor event record
data can be transported from one monitor to another, having discrepancies in
the date/time between monitors and the sensor event record data will affect
the order the sensor event record data appears. To eliminate this possible
problem, all monitors within an institution should be set to the same time.
WARNING: Explosion hazard. Do not use the N-595 pulse oximeter in the
presence of flammable anesthetics.
WARNING: Do not spray, pour, or spill any liquid on the N-595, its
accessories, connectors, switches, or openings in the chassis.
WARNING: Before attempting to open or disassemble the N-595, disconnect
the power cord from the N-595.
WARNING: The LCD panel contains toxic chemicals. Do not ingest
chemicals from a broken LCD panel.

Introduction
2
WARNING: The use of accessories, OXI-MAX sensors, and cables other than
those specified may result in increased emission and/or decreased immunity
of the N-595 pulse oximeter.
WARNING: Do not silence the N-595 audible alarm or decrease its volume if
patient safety could be compromised.
Cautions
Cautions are identified by the CAUTION symbol shown above.
Cautions alert the user to exercise care necessary for the safe and effective use of
the N-595 pulse oximeter.
Caution: Observe ESD (electrostatic discharge) precautions when working
within the unit.
Caution: Observe ESD (electrostatic discharge) precautions when
disassembling and reassembling the N-595 and when handling any of the
components of the N-595.
Caution: When reassembling the N-595, tighten the screws that hold the
cases together to a maximum of 10 inch-pounds. Over-tightening could strip
out the screw holes in the top case, rendering it unusable.
Caution: When installing the Power Supply or the User Interface PCB,
tighten the seven screws to a maximum of 4 inch-pounds. Over-tightening
could strip out the screw holes in the bottom case, rendering it unusable.
Manual Overview
This manual contains information for servicing the Nellcor model N-595 pulse
oximeter. Only qualified service personnel should service this product. Before
servicing the N-595, read the operator's manual carefully for a thorough
understanding of safe operation of the N-595.
WARNING: Explosion hazard. Do not use the N-595 pulse oximeter in the
presence of flammable anesthetics.

Introduction
N-595 3
Description of N-595 Monitor
The N-595 Monitor is intended for the continuous non-invasive monitoring of
functional oxygen saturation of arterial hemoglobin (SpO2) and pulse rate. The
N-595 is intended for use with neonatal, pediatric, and adult patients during both
no-motion and motion conditions and for patients who are well or poorly
perfused, in hospitals, hospital-type facilities, intra-hospital transport, and home
environments. For prescription use only.
Note: Hospital use typically covers such areas as general care floors, operating
rooms, special procedure areas, intensive and critical care areas, within
the hospital plus hospital-type facilities. Hospital-type facilities include
physician office based facilities, sleep labs, skilled nursing facilities,
surgicenters, and sub-acute centers.
Intra-hospital transport includes transport of a patient within the hospital
or hospital-type facility.
Home Care use is defined as managed/used by a lay person (parent or
other similar non-critical caregiver) in the home environment.
Use with any particular patient requires the selection of an appropriate
OXI-MAX oxygen sensor as described in the N-595 Operator's Manual.
Motion performance claims are applicable to models MAX-A, MAX-AL,
MAX-P, MAX-N, and MAX-I Nellcor OXIMAXTM oximetry sensors.
Through the use of the four softkeys, the operator can access trend information,
select an alarm limit to be changed, choose the language to be used, adjust the
internal time clock, and change communications protocol. The N-595 can operate
on AC power or on an internal battery. The controls and indicators for the N-595
are illustrated and identified in Figure 1 and Figure 2.

Introduction
4
Front Panel
Figure 1: N-595 Front Panel
Rear Panel
Figure 2: N-595 Rear Panel
1. SpO2Sensor Port 12. ADJUST DOWN Button
2. AC Power Indicator 13. Neonate Mode Indicator
3. ON/STANDBY Button 14. CONTRAST Button
4. Low Battery Indicator 15. Fast Response Mode Indicator
5. Waveform Display 16. Softkeys
6. SatSecondsTM Timer 17. Menu Bar
7. %SpO2Display 18. Data In-Sensor Indicator
8. Pulse Rate Display 19. Motion Indicator
9. Alarm Silence Display 20. Pulse Search Indicator
10. ALARM SILENCE Button 21. Speaker
11. ADJUST UP Button
1. Equipotential Terminal (Ground) 4. Fuse Receptacle
2. AC Power Connector 5. Supply Voltage Selector Switch
3. Data Port Connector

Introduction
N-595 5
Softkey Menu
The N-595 hierarchy is outlined below. The user chooses the type of trend data to
view by selecting either Monitor trend or Sensor trend data in the Trend menu.
Sensor sub-menu choices differ depending on what type of in-sensor data is stored
in the sensor chip, such as, event or loop.
The menu structure includes BACK softkey options that allow the user to move
back to the previous menu level without exiting the Trend menu entirely. Trend
data must be compiled on entry/reentry to the Trends menu. When the softkeys are
available, both BACK and EXIT options are available. The BACK softkey goes to
the previous level and the EXIT softkey goes to the main menu. If only one space
is available the BACK Softkey is included, this may require going back one or
two levels to get to an EXIT softkey.
The BACK and EXIT softkeys are positioned on the right-most softkeys,
respectively.
The below menu structure identifies:
•BOLDFACE TYPE — softkey title as displayed on the monitor
• Underlined Text — description of the softkey menu item
•Italicized Text — the destination of the BACK and EXIT softkeys
(Main Menu)
LIMITS (Limits Menu)
- SELECT
-NEO
- ADULT
EXIT (to Main menu)
TREND (Trend Menu)
-MON(Monitor Menu)
--VIEW(Monitor Trend View Menu)
---DUAL
---SPO2
---PULSE
---NEXT(History/Amplitude Menu)
----HIST(Delete/Print2 Menu)
-----DELETE(delete Trends)
------“DELETETRENDS”
-------YES (return to Main menu)
-------NO(back to Delete/Print menu)
-----PRINT
-----BACT(back to Hist/Amp menu)
-----EXIT(to Main menu)
----AMP(Amplitude Menu)
-----BACK(back to Hist/Amp menu)
-----EXIT(to Main menu)
----BACK(back to Monitor Trend View menu)
----EXIT(to Main menu)

Introduction
6
--ZOOM(Monitor Trend Zoom Menu)
---TIME(for current view, cycle through 48h, 36h, 12h, 8h, 4h, 2h, 1h,
30m, 15m, 40s, 20s)
---SCALE(for current view, cycle through ±5, ±10, ±15, ±20, ±25,
±30, ±35, ±40 and ±50 of the max and min. values under the
cursor, default to 10 to 100 if there is no data point under the
cursor)
---AUTO(based on all of the graphed trend data: maximum value,
rounded up to nearest multiple of 10, minimum value, rounded
down to nearest multiple of 10 minus 10)
- - - BACK (back to Monitor menu)
--NEXT(Delete/Print1 Menu)
---DELETE
----“DELETETRENDS?”
-----YES (to Main menu)
-----NO(back to Delete/Print1 menu)
---PRINT
- - - BACK (back to Monitor menu)
---EXIT(to Main menu)
- - BACK (back to Trend menu)
- SENSOR (Sensor/Event Menu)
(if Event data is in the sensor, the following menu, the Screen will remain in
the appropriate state until the next menu selection is made)
- - GRAPH (Graph Menu) (display events #1-N, in inverse chronological
order; up/down also scroll through events in order)
---<(show previous graph, only available when there is a previous
graph)
--->(show next graph, only available when there is a next graph)
---PRINT
---BACK(back to Sensor menu)
--TABLE(Table Menu)
---^(show previous table, only available when there is a previous
graph; bottom/top line repeats in new table)
---v(show next table, only available when there is a next graph;
bottom/top line repeats in new table)
---PRINT
- - - BACK (back to Sensor menu)
---EXIT(to Main menu)
(Sensor/Loop Menu) (If continuous-Loop data is in the sensor, the following
will be displayed)
--VIEW(Sensor Trend View Menu)
---DUAL(shows SPO2+BPM)
---SPO2
---PULSE
--ZOOM(cycle through 2h. 1h, 30m, and 15m for current view)
- - PRINT
- - BACK (to Trend menu)
- EXIT (to Main menu)
SETUP (Setup Monitor Menu)
-VIEW(Setup View Menu)
- - PLETH
--BLIP
- - BACK (back to Setup menu)
- - EXIT (to Main menu)
- SENSOR (Setup Sensor Menu)

Introduction
N-595 7
--DATA(On-screen options for SENSOR-R (Write-once Sensor) sensor
are: “SPO2, SPO2+BPM, DEFAULT.” On-screen options for
SENSOR-RW (rewritable sensor) are: “SPO2, SPO2+BPM,
DEFAULT.” SELECT toggles SENSOR-R or SENSOR-RW
sensor type; up/down keys scroll through options in order.)
The SENSOR-R feature supports all of the current OXIMAX
sensors.
- - - SELECT
- - - BACK (back to Setup Sensor menu)
---EXIT(to Main menu)
--MSG(Sensor Set Message Menu)
- - - BACK (back to Setup Sensor menu)
---EXIT(to Main menu)
- NEXT (Clock/Language Menu)
--CLOCK(Clock Menu)
---SET(Clock Set Menu)
----SELECT(press select to toggle through hours, minutes,
seconds, month, day, year; use up/down buttons to set each
selection)
----BACK(back to Clock/Language menu)
----EXIT(to Main menu)
--LANG(Language Setup Menu) (use up/down buttons to toggle though
languages)
- - - BACK (back to Clock/Language menu)
--NEXT(Communication/Nurse Call Menu)
---COMM(Communication Port Configuration Menu)
----SELECT
----BACK(back to Communication/Language menu)
----EXIT(to Main menu)
---NCALL(Nurse Call Menu)
----NORM+
----NORM-
----BACK(back to Communication/Nurse Call menu)
----EXIT(to Main menu)
---NEXT(Analog/Mode Menu)
----ANALOG(Analog Voltage Select Menu)
-----0VOLT
-----1VOLT
-----STEP
-----BACK(back to Analog/Mode menu)
----MODE(Mode Menu)
-----BACK(back to Analog/Mode menu)
-----EXIT(to Main menu)
----BACK(back to Communication/Nurse Call menu)
----EXIT(to Main menu)
---BACK(back to Clock/Language menu)
- - BACK (back to Setup menu)
- EXIT (to Main menu)
LIGHT (Turns the display backlight on or off)

Introduction
8
Related Documents
To perform test and troubleshooting procedures and to understand the principles
of operation and circuit analysis sections of this manual, you must know how to
operate the monitor. Refer to the N-595 operator's manual. To understand the
various Nellcor approved OXI-MAX sensors that work with the monitor, refer to the
individual OXI-MAX sensor's directions for use.
The latest version of the operator’s manual and the service manual are posted on
the Internet at:
http://www.mallinckrodt.com/respiratory/resp/Serv_Supp/ProductManuals.html
Spare Parts and Accessories are posted on the Internet at:
http://www.mallinckrodt.com/respiratory/resp/Serv_Supp/Apartweb/main/PartAcceMenu.html

N-595 9
Routine Maintenance
Cleaning
WARNING: Do not spray, pour, or spill any liquid on the N-595, its
accessories, connectors, switches, or openings in the chassis.
For surface-cleaning and disinfecting follow your institution's procedures or:
•TheN-595 may be surface-cleaned by using a soft cloth dampened with
either a commercial, nonabrasive cleaner or a solution of 70% alcohol in
water, and lightly wiping the surfaces of the monitor.
•TheN-595 may be disinfected using a soft cloth saturated with a 10%
solution of chlorine bleach in tap water.
Before attempting to clean an SpO2OXI-MAX sensor, read the directions for use
enclosed with the OXI-MAX sensor. Each sensor model has cleaning instructions
specific to that sensor.
Periodic Safety Checks
The N-595 requires no calibration.
The battery should be replaced at least every 2 years. See Battery Replacement on
page 67.
The following checks should be performed at least every 24 months by a qualified
service technician.
1. Inspect the equipment for mechanical and functional damage.
2. Inspect safety labels for legibility. If the labels are damaged, contact Nellcor’s
Technical Services Department, 1.800.635.5267, or your local Nellcor
representative.
Functional Checks
If the monitor has been visibly damaged or subjected to mechanical shock (for
example, if dropped), immediately perform the performance tests. See
Performance Tests on page 11.

Routine Maintenance
10
The following checks should be performed at least every 2 years by a qualified
service technician.
1. Perform the electrical safety tests detailed in Safety Tests on page 33. If the
unit fails these electrical safety tests, refer to Troubleshooting on page 51.
2. Inspect the fuses for proper value and rating (F1 & F2 = 0.5 amp, 250 volts).
Battery
Nellcor recommends replacing the instrument's battery every 2 years. When the
N-595 is going to be stored for 3 months or more, remove the battery prior to
storage. To replace or remove the battery, refer to Disassembly Guide on page 63.
If the N-595 has been stored for more than 30 days, charge the battery as
described in Battery Charge on page 12. A fully discharged battery requires 14
hours with the monitor turned off, or 18 hours if it is in use, to receive a full
charge. The battery is being charged whenever the instrument is plugged into AC.
Note: If power stored in the battery is too low, the unit will not operate even
when plugged into AC. If this occurs, leave the unit plugged in to allow
the battery to charge as described in Battery Charge on page 12. After
approximately 10 minutes, the battery should have enough charge to
allow the unit to operate on AC.

N-595 11
Performance Verification
Introduction
This section discusses the tests used to verify performance following repairs or
during routine maintenance. All tests can be performed without removing the
N-595 cover. All tests except the battery charge and battery performance tests
must be performed as the last operation before the monitor is returned to the user.
If the N-595 fails to perform as specified in any test, repairs must be made to
correct the problem before the monitor is returned to the user.
Equipment Needed
Performance Tests
The battery charge procedure should be performed before monitor repairs
whenever possible.
Note: This section is written using Nellcor factory-set defaults. If your
institution has pre configured custom defaults, those values will be
displayed. Factory defaults can be restored (see Reset Softkey on
page 40).
Table 1: Equipment Needed
Equipment Description
Digital Multimeter (DMM) Fluke Model 87 or equivalent
Durasensor®OXI-MAX oxygen
sensor
DS-100A
OXIMAX oxygen sensor MAX-A
Safety Analyzer Must meet current AAMI ESI/1993 & IEC
60601-1/1998 specifications
Pulse oximetry cable DOC-10
Data interface cable EIA-232 cable (optional)
Stopwatch Manual or electronic
Nellcor model SRC-MAX Tester Provides testing for DigiCal compatible
Monitors

Performance Verification
12
Battery Charge
Perform the following procedure to fully charge the battery.
1. Connect the monitor to an AC power source.
2. Verify that the monitor is off and that the AC Power/Battery Charging
indicator is lit.
3. Charge the battery for at least 14 hours with the monitor turned off or 18 hours
with the monitor turned on.
Power-Up Performance
The power-up performance tests verify the following monitor functions:
•Power-On Self-Test on page 12
•Power-On Defaults and Alarm Range Limits on page 13
Power-On Self-Test
1. Connect the monitor to an AC power source.
2. Verify that the monitor is off and that the AC Power/Battery Charging
indicator is lit.
3. Do not connect any cables to the monitor.
4. Turn on the N-595 by pressing the ON/STANDBY button. Observe the
monitor front panel. The monitor must perform the following:
• Within 2 seconds all LEDs are illuminated, all pixels on the LCD display
are illuminated, and the backlight comes on.
• The indicators remain lighted.
• The LCD display shows NELLCOR and the software version of the
N-595.