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NPB-195 Service Manual

1. 044 12961 RESET404 Figure 11 7 CLK4 883KHZ Do not populate 0 ohm Watchdog Debug Jumper 404 DSP Core and Communication Schematic 11 19 lt 404 ISOLATED SIDE 331 CORE SIDE gt CLKA624KHZ U36 TH 11529 HCPL2531 R78 681 Q26 119430 VDD VDD VDD VDD VDD VDD VDD VDD A 17 0 010 15 UARTCSL 0 R21 R20 JR19 R18 JR12 JR11 JR10 j 10 0K 10 0K 10 0K 10 0K 10 0K 10 0K 10 0K Q Q P OOO O BUF FLA 1 U19A 18 121210 PWR SIN SOUT RCLK BAUDOUT RTS CTS DTR DSR DCD RI RESETH R WL UART_IRQL A CLK312KHZ A CLK156KHZ CLK624KHZ FRONT END RSTL Figure 11 8 404 Front End to 331 Core Communication Schematic 11 21 11700 5VA 107 lt 404 ISOLATED SIDE 331 CORE gt Place 10uh inductors on bottom side active side Per mfg recommendations parts cannot be wave soldered 1243 1185 O O TP10 11702 COLA and COLB carry 0 5A Trace Width 0 050 Use redundant ICT test points for vias by LT1533 1467 25V 6 80 CR40 C120 CLK312KHZ A TPQ 12VA C121 10UH 11705 100 35V
2. 5 2 5 7 Troubleshooting Guide a 5 2 5 8 Error Codes uuu eva ce Ben ea ce 5 6 SECTION 6 Disassembly Guide 6 1 6 1 introduction ul u na teret ale 6 1 6 2 Prior to Disassembly 6 1 6 3 Fuse Replacement enon aisee 6 2 6 4 Monitor DISASSOMDIY ae 6 3 6 5 Monitor ASSOMDIy 6 4 6 6 Battery Replacement u uu 6 5 6 7 Power Entry Module PEM Removal Replacement 6 6 6 8 Power Supply Removal Replacemernt 6 7 6 9 Cooling Fan Removal Replacement 6 9 6 10 Display PCB 6 10 6 11 User Interface PCB Removal Replacemernt 6 11 6 12 Alarm Speaker Removal Replacement 6 13 SECTION 7 Spare Pa S a r e a aa a daera aras aa e da de ae AE Ea dinana Eaua 7 1 7 1 MOGUCOM A AA 7 1 SECTION 8 Packing For Shipment
3. 8 1 8 1 0 ec et tee a Rae Cd 8 1 Table of Contents 8 2 Generali 5 amp 8 1 8 3 Repacking in Original Carton seen 8 2 8 4 Repacking in a Different Carton 8 3 SECTION 9 Specifications 9 1 9 1 gii tede qi e e dat 9 1 9 2 Electrical aan t 9 1 9 3 Physical CharacteristicS 9 2 9 4 Environmental u a Sa aee 9 2 9 5 m 9 2 9 6 Factory Default Settings 9 2 9 7 Performan e aere t cete ordi pcr ae CERE ERA C eases 9 3 SECTION 10 Data Port Interface Protocol 10 1 10 1 IntrodUctlori 10 1 10 2 Configuring the Data Port 10 1 10 3 Connecting to the Data Port 10 5 10 4 Communications with a PC 10 7 10 5 Using Data on ohe PC 10 8 10 6 Real Time Printout eese nnns 10 8 10 7 Trend Data
4. 10 10 ANALOG OUTPUT Analog outputs are provided for Saturation Pulse Rate and a plethysmographic waveform The output voltage is 0 0 to 1 0 VDC for all three parameters A 1 0 VDC output for saturation equals 100 for pulse rate it equals 250 bpm and for plethysmographic waveform it equals 254 pulse amplitude units The voltage will decrease as the values for these parameters decrease If no data for a parameter is available the output voltage for that parameter will be 1 0 VDC At power on after the completion of power on self test POST the instrument will initiate an automatic three step calibration signal The calibration signal will begin at 0 0 VDC and hold that point for 60 seconds It will then jump up to 1 0 VDC and hold that value for 60 seconds The third part of the calibration signal is a stair step signal The stair step signal will start at 0 0 VDC and increase up to 1 0 VDC in 0 1 VDC increments Each increment will be held for 1 second Through use of the softkeys the 0 0 VDC 1 0 VDC or stair step signal can be selected individually paragraph 3 3 3 6 10 13 Blank Page SECTION 11 TECHNICAL SUPPLEMENT 11 1 Introduction 11 2 Oximetry Overview 11 8 SatSeconds Alarm Management 11 4 Reads Through Motion 11 5 Circuit Analysis 11 6 Functional Overview 11 7 AC Input 11 8 Power Supply PCB 11 9 Battery 11 10 User Interface PCB 11 11 Front Panel Display PCB and Controls 11 12 Schema
5. 11709 VCCA TP11 163 Tie VLED to VCCA at 100uf cap Place 22nh inductor on bottom side active side Per mfg recommendations part cannot be wave soldered COL REF COMP RMID V FGND RTOP SGND Figure 11 9 404 Front End Power Supply Schematic 11 23 CLK156KHZ SIPSOP EN U14A 12121 Place by Q3 C42 0 1U TX485 EN SIP SOP ISOLATION BARRIER SIP SOP ISOLATED AREA 4 65 C12 47 0 10 T 10V C27 47U T 10 NC RELAY PLACE BY U9 VDD l C13 0 1U PLACE BY U14 i 1 C29 0 1U i 74HC74 Bypass RCV 232 12163 Figure 11 10 SIP SOP Interfaces Schematic 11 25 RCV 232 RCV 485 RS 485 DRIVER RS 232 DRIVER RSROUT TXENAB TXOUT TXOUT CMOS pa LEVEL RCV 232 RXD 232 TXD 232 RXD 232 1331 8BIT DAC 0 Analog Outputs AN_SPO2 1847 015 LAYOUT TO MINIMIZE CROSSTAL x PER MFG RECOMMENDATIONS C11 R6 0 1U 11714 4 1 00 1 2 PLETH 4 02K_0 1 C25 r THIS WHOLE SHEET IS WITHIN THE SIP SOP ISOLAT
6. 2 1 2 1 irt ite tc ede ecce ttes 2 1 2 2 Periodic Safety and Functional Checks 2 1 2 3 Battery ii sete de bab base eia asa 2 1 SECTION 3 Performance Verification 3 1 3 1 3 1 3 2 Equipment Needed tre ete nee Ud 3 1 3 3 Performance Tests enne 3 1 3 4 3 10 SECTION 4 Power On Settings and Service Functions 4 1 4 1 4 1 4 2 Power On Settlhgs utin 4 1 4 3 Factory Default Settings 4 1 4 4 Service Functions 4 1 4 5 Setting Institutional Defaults Sample 4 8 SECTION 5 Troubleshooting 5 1 5 1 Clai e Sa cobertura 5 1 5 2 How to Use this Section 5 1 5 3 Who Should Perform Repairs 5 1 5 4 Replacement Level 5 1 5 5 Returningithe N 395 1i deme mice erp ee d ees 5 1 5 6 Obtaining Replacement Parts
7. Figure 4 14 Service Function Softkeys Section 4 Power On Settings and Service Functions 4 Press the PARAM softkey See Figure 4 15 Figure 4 15 PARAM Softkeys 5 Press the SAVE softkey See Figure 4 16 Figure 4 16 SAVE Softkeys 6 The monitor will sound 3 beeps indicating that defaults have been reset 4 9 Blank Page SECTION 5 TROUBLESHOOTING 5 1 5 2 5 3 5 4 5 5 5 1 Introduction 5 2 How to Use this Section 5 3 Who Should Perform Repairs 5 4 Replacement Level Supported 5 5 Returning the N 395 5 6 Obtaining Replacement Parts 5 7 Troubleshooting Guide 5 8 Error Codes INTRODUCTION This section explains how to troubleshoot the N 395 if problems arise Tables are supplied that list possible monitor difficulties along with probable causes and recommended actions to correct the difficulty HOW TO USE THIS SECTION Use this section in conjunction with Section 3 Performance Verification and Section 7 Spare Parts To remove and replace a part you suspect is defective follow the instructions in Section 6 Disassembly Guide The circuit analysis section in the Technical Supplement offers information on how the monitor functions WHO SHOULD PERFORM REPAIRS Only qualified service personnel should open the monitor housing remove and replace components or make adjustments If your medical facility does not have qualified service personnel contact Nellcor Technical Services at 1
8. The N 395 software version 1 7 and above provides a bedside monitor interface for interfacing the N 395 with Agilent HP SpaceLabs Marquette and Datex monitors 10 2 CONFIGURING THE DATA PORT Items pertaining to the data port can be adjusted by following the softkey map in Figure 10 1 For a complete description of the softkeys see the operator s manual LIMITS TREND SETUP LIGHT VIEW CLOCK NEXT EXIT COMM LANG NEXT EXIT BAUD 2400 ENGLISH FRANCAIS 9600 or 19200 DEUTSCH ITALIANO PROTOCOL ASCII ESPANOL NEDERLANDS GRAPH or PORTUG CLINICAL AGILENT SPACELBS MARQ or DATEX NCALL ANALOG NEXT EXIT NORM 0 VOLT NORM 1 VOLT STEP Press the Softkey under the desired parameter then press EXIT to return to the user menu Figure 10 1 Data Port Softkeys 10 1 Section 10 Data Port Interface Protocol 10 2 1 10 2 The COMM key is used to select from eight communication protocols supported by the data port The selections are e ASCII used for printouts or interface with Intouch e GRAPH for graphic printouts e CLINICAL intended for Nellcor use only e OXINET to enable communication with Oxinet II e AGILEN interfaces the N 395 with an Agilent HP monitor e SPACELBS interfaces the N 395 with a SpaceLabs monitor e interfaces the N 395 with a GE Marquette monitor e DATEX interfaces the N 395 with a Datex Ohmeda AS 3 monitor Note Communication protocols for AGILEN SPAC
9. Accessing 4 1 Alarms 4 6 Downld 4 6 Errlog 4 4 Exit Softkey 4 2 Info 4 6 Instat 4 5 Next 4 6 Next Softkey 4 2 Param 4 2 Print 4 3 Reset 4 3 Save 4 3 12 2 Select 4 7 Trend 4 4 Setup Softkey Map 1 4 SpaceLabs Communications 10 4 Spare Parts 7 1 Obtaining 5 2 Specifications 9 1 T Tests Performance 3 1 Theory of Operation Battery 11 5 Display PCB 11 8 Power Supply PCB 11 4 User Interface PCB 11 5 Trend Softkey Map 1 3 Troubleshooting 5 1 Error Codes 5 6 Other Messages 5 7 Troubleshooting Guide 5 2 V Verification Performance 3 1
10. Place the clamp over the ferrite assure that no wires are pinched and screw the clamp to the User Interface PCB 16 Complete the procedure in paragraph 6 5 6 12 ALARM SPEAKER REMOVAL REPLACEMENT Removal 1 Complete the procedures in paragraphs 6 2 and 6 4 2 Disconnect the speaker wire harness from J3 on the User Interface PCB Figure 6 10 3 Pull the holding clip back from the speaker and lift the speaker out of the top case Speaker Wina Harness Holding Clip E QA Er bh Figure 6 10 Alarm Speaker Replacement 4 Pull the holding clip back and insert the speaker into the top case 5 Connect speaker wire harness to J3 on the User Interface PCB 6 Complete the procedure in paragraph 6 5 6 13 Blank Page SECTION 7 SPARE PARTS 7 1 Spare Parts 7 1 INTRODUCTION The latest version of this manual is available on the Internet at http www mallinckrodt com respiratory resp Serv_Supp ProductManuals html Spare parts along with part numbers are shown in Table 7 1 Item numbers correspond to the callout numbers in Figure 7 1 Spare parts and accessories for the N 395 are listed on the Internet at http www mallinckrodt com respiratory resp Serv_Supp Apartweb main PartAcceMenu htm 1 Check the Internet for the latest part numbers Table 7 1 Parts List Item Description Part Number 1 O Top Cas
11. Troubleshooting Table 5 7 Error Codes Code Meaning Possible Solutions 52 Loss of settings 1 Cycle power 2 Check and reset settings if necessary 3 Check battery 4 Replace User Interface PCB if code repeatedly occurs 76 Error accessing EPROM Cycle power Replace User Interface PCB 80 Institutional default values lost Cycle power and reset to factory default Replace User Interface PCB if values code 80 repeatedly occurs 81 Settings lost settings that were Cycle power different from power on default 2 Check and reset settings if values have been lost necessary Check battery Replace User Interface PCB if code repeatedly occurs 82 Time clock lost Reset time clock Battery power was lost check the battery Replace the Power Supply 84 Internal communications error 1 Cycle power 2 Replace User Interface PCB if code repeatedly occurs Other Messages In addition to the error codes listed in Table 5 7 the following messages may be encountered DISALLOWED ON BATTERY An attempt to print or download data port information while operating on battery power has been made Connect to AC power and retry DISALLOWED ON LOW BATTERY An attempt to turn on the backlight has been made while in a low battery condition If the backlight is turned off during a low battery condition it cannot be turned back on INVALID SILENCE DURATION An attem
12. cChassis enclosures The following tools are required e small Phillips head screwdriver medium Phillips head screwdriver small blade screwdriver needle nose pliers or 1 4 inch socket torque wrench 10 inch pounds 1 13 Newton meters WARNING Before attempting to open or disassemble the N 395 disconnect the power cord from the N 395 Caution Observe ESD electrostatic discharge precautions when working within the unit Note Some spare parts have a business reply card attached When you receive these spare parts please fill out and return the card 6 2 PRIOR TO DISASSEMBLY 1 Turn the N 395 off by pressing the POWER ON OFF button 2 Disconnect the monitor from the AC power source 6 1 Section 6 Disassembly Guide 6 3 FUSE REPLACEMENT 1 Complete the procedure in paragraph 6 2 2 Disconnect the power cord from the back of the monitor 3 Remove the fuse drawer from the power module by pressing down on the tab in the center and pulling out as shown in Figure 6 1 Figure 6 1 Fuse Removal 4 Put two new 5 x 20 mm slow blow 0 5 amp 250 volt fuses in the drawer and reinsert the drawer in the power entry module 6 2 Section 6 Disassembly Guide 6 4 MONITOR DISASSEMBLY 1 Complete the procedure in paragraph 6 2 2 Set the N 395 upside down as shown in Figure 6 2 Carner soras Figure 6 2 N 395 Corner Screws 2 Remove the four corner screws Cautio
13. clock will not reflect the actual date and time After battery power has been restored it will be necessary to reset the date and time When Item 2 has been selected the date and time can be changed via the PC The format for date and time is DD MMM YY HH MM SS Move the cursor under the value to be changed and enter the new value Dump Trend Selecting option 3 outputs current trend information Up to 48 hours of trend information can be viewed Information presented includes e instrument type e software revision level printout type e alarm limits e dateandtime SpO2 pulse rate pulse amplitude 10 7 Section 10 Data Port Interface Protocol 10 5 10 6 10 8 Dump Error Log A list of all of the error codes in memory can be obtained by selecting item 4 The information that can be viewed includes instrument type software revision level printout type time of printout operating time of the recorded error error number task number address and count This option is intended for Nellcor field service personnel Exit Interactive Mode Selecting item 5 exits the interactive mode and returns the data port to normal operation USING DATA ON THE PC Data displayed on the PC screen can be captured for use in a word processing spreadsheet Open a terminal program such as HyperTerminal Verify that the communications format is compatible with the data port of the N 395 If the communications format
14. Printout ASCII 10 11 10 8 Trend Printout Graph 10 12 10 9 Nurse Gallu ae bet 10 12 1040 Analog rct nei ntes 10 19 SECTION 11 Technical Supplemen t 11 1 11 1 JE 11 1 11 2 Oximetry 0 8 61 11 1 11 3 Satseconds Alarm Management sse 11 2 11 4 Reads Through Motion l 11 3 11 5 Gircuit Analysis u ener i e viens 11 3 11 6 Functional Overview Ne 11 3 TEZ AGC yo aed esc 11 3 11 8 Power Supply PGB ee eth e te ede 11 4 11 5 11 10 User Interface PCB 11 5 11 11 Front Panel Display PCB And Controls 11 8 11 12 Schemati DIagralfiS u us e e eri t Ex 11 9 SECTION 12 Index aN ua u asss 12 1 Table of Contents LIST OF FIGURES Figure 1 1 N 395 Front Panelaren niei nennen 1 2 Figure 1 2 N 395 Rear 1 2 Figure 1 83 Limits Softkey Map 1 8
15. RAMHCSL RAMLCSL D 15 0 D 15 0 Figure 11 13 MC331 Memory Schematic 11 31 Layout Note One via per 47UF cap to each plane 1475 R41 1 00K C192 2 1 SPKR1 PWM_FREQ TAMA 4 2 0 10 25V SPKR1 and SPKR2 carry 0 25A Trace Width 0 020 11420 PWM VOL DISP EN U47 11570 1400 POTCSL SERCLK SERDATA CONTRAST CONTROL Figure 11 14 Contrast and Sound Schematic 11 33 To Linear Power Supply J8 L 2 4 MAIN OUT CR28 MAIN DC1 1 BATT BATT CHECK MAIN QUT 144 C150 1 0U Critical at approx 5 68V Low at approx 5 85V Normally HIGH active LOW VDD Normally HIGH active LOW CRIT_BATT L LOW_BATT L ONBUTTON 79 100 ig c Place 10U cap near CTX10 4 pin 1 Place caps next to LT1121 1448 8 3_3V CR17 TPS 1218 RAMPWR Connect C68 C69 with traces directly to GND vias of U41 pin 4 L31 1129 VDD NFM61R 4700P CLK624KHZ CLRIII A BTN PRS L Figure 11 15 Power Supply Schematic 11 35 CCFL inverter ASLEDDR 1 AA R217 4 99K BATLEDDR1 Av R216 se 4 99K PSLEDDR x LA 1 Turn off control Note These traces must be as shortas possible 1
16. Softkey Map 1 3 Section 1 Introduction SETUP VIEW PLETH BLIP CLOCK SET SELECT EXIT EXIT MEXT COMM SELECT EXIT LANG EXIT NEXT NIALL NORM EXIT ANALOG VOLT 1 VOLT STEP EXIT EXIT EXIT Figure 1 5 Setup Softkey Map 1 4 Section 1 Introduction 1 3 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 395 operator s manual To understand the various Nellcor sensors that work with the monitor refer to the individual sensor s directions for use The latest version of this manual and Nellcor Sensor s directions for use are available on the Internet at http www mallinckrodt com respiratory resp Serv_Supp ProductManuals html 1 5 Blank Page SECTION 2 ROUTINE MAINTENANCE 2 1 2 2 2 3 CLEANING 2 1 Cleaning 2 2 Periodic Safety and Functional Checks 2 3 Battery Caution Do not immerse the N 395 or its accessories in liquid or clean with caustic or abrasive cleaners Do not spray or pour any liquid on the monitor or its accessories To clean the N 395 dampen a cloth with a commercial nonabrasive cleaner and wipe the exterior surfaces lightly Do not allow any liquids to come in contact with the power connector fuse holder or switches Do not allow any liquids to penetrate connectors or openings
17. bpm UIF Status Aud BULB M BULBAS M BULB AS H Limit 60 180 bpm UIF Status Aud BU BU BU BU BU BU BU 4 5 Section 4 Power On Settings and Service Functions 4 4 5 4 6 NEXT INFO Nellcor Customer Service Engineer Only Pressing the INFO softkey produces a printout of instrument information as illustrated in Figure 4 8 A single line will be printed The data presented in the printout going from left to right is the instrument type N 395 software version level type of printout INFO CRC Cyclic Redundancy Check number and the ratio of current operating time to total operating time the ratio itself has no units of measure N 395 Version XXXXXX INFO CRC XXXX SEC 123456789 987654321 Figure 4 8 INFO Printout Additional options can be accessed from the main Service Functions menu by pressing the NEXT softkey When NEXT is pressed the softkeys change to the functions shown in Figure 4 9 Figure 4 9 NEXT Softkeys DOWNLD When DOWNLD is selected the instrument will display the revision of the Boot Code To exit DOWNLD cycle power to the instrument by pressing the POWER ON OFF button Consult the Directions for Use DFU provided with any downloads or upgrades to the FLASH firmware ALARMS Pressing the ALARMS softkey can change characteristics of the audible alarm When the ALARMS softkey is pressed the softkey s functions change as shown in Figure 4 10 Figure 4 10 ALARMS Softkeys Se
18. cable of the Display PCB Disconnect the keypad ribbon cable from ZIF connector J8 on the User Interface PCB Figure 6 8 Lift up on the ribbon cable s outer shell until it clicks then remove the cable from the connector Disconnect the speaker cable from J3 on the User Interface PCB See Figure 6 8 Remove the five screws in the User Interface PCB Figure 6 9 Remove the User Interface PCB from the top case 6 11 Section 6 Disassembly Guide 6 12 lt a x Figure 6 9 User Interface PCB Replacement Caution When installing the User Interface PCB hand tighten the five screws to a maximum of 4 inch pounds Over tightening could strip out the screw holes in the top case rendering it unusable 9 10 11 12 13 14 Place the User Interface PCB in the top case Install the five screws in the User Interface PCB Lift up on the outer shell of J8 Figure 6 8 on the User Interface PCB until it clicks Insert the keypad ribbon cable into J8 of the User Interface PCB Slide the outer shell of J8 down until it locks in place Connect the speaker cable to J3 of the User Interface PCB Connect the CCFL wire harness with two white wires to J7 of the User Interface PCB Connect the Display PCB ribbon cable to J5 of the User Interface PCB Install the clip over the 15 connector Section 6 Disassembly Guide 15 Secure the ferrite on the ribbon cable from the Display PCB
19. display shows NELLCOR and the software version of the N 395 Figure 3 2 Note The software Version displayed in Figure 3 2 is X X X X The actual software version will be displayed on the monitor oo NELLCOR X X Figure 3 2 Self Test Display 3 2 Section 3 Performance Verification d A 1 second beep sounds indicating proper operation of the speaker and all indicators turn off except the AC Power Battery Charging indicator and the LCD screen e The N 395 begins normal operation 3 3 2 2 Power On Defaults and Alarm Limit Ranges Note When observing or changing alarm limits a 10 second timeout is in effect If no action is taken within 10 seconds the monitor automatically returns to the monitoring display Note The descriptions that follow are based on the assumption that Pleth view is the view that has been selected The steps for changing an alarm limit are the same if the view being used is Blip Magnified view Figure 3 3 Figure 3 3 Blip Magnified View Note Power on defaults will be the factory set defaults or the defaults set by your institution 1 Ensure that the monitor is on Press and release the LIMITS softkey Verify that the monitor emits a single beep and the pleth view is replaced with a display of the alarm limits The upper alarm limit for SpO2 will indicate an alarm limit of 100 inside a box Figure 3 4 Figure 3 4 Adjusting SpO2 Upper Alarm Limit No
20. in the instrument cover Wipe sensor cables with a damp cloth For sensors follow each sensor s directions for use PERIODIC SAFETY AND FUNCTIONAL CHECKS BATTERY The following checks should be performed at least every 2 years by qualified service technicians 1 Inspect the exterior of the N 395 equipment for damage 2 Inspect the safety labels for legibility If the labels not legible contact Nellcor Technical Services Department or your local Nellcor representative 3 Verify that the unit performs properly as described in paragraph 3 3 4 Perform the electrical safety tests detailed in paragraph 3 4 If the unit fails these electrical safety tests repair the unit or contact Nellcor Technical Services Department or your local Nellcor representative for assistance 5 Inspect the fuses for proper value and rating F1 amp F2 0 5 amp slow blow Nellcor recommends replacing the instrument s battery every 2 years When the N 395 is going to be stored for 3 months or more remove the battery prior to storage To replace or remove the battery refer to Section 6 Disassembly Guide If the N 395 has been stored for more than 30 days charge the battery as described in paragraph 3 3 1 A fully discharged battery requires 14 hours with the monitor in standby 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 i
21. interface baud rate must be set to 9 600 bits per second Press the SETUP softkey then the NEXT softkey and then the COMM softkey to select BAUD Use the ADJUST UP or ADJUST DOWN buttons to select the correct baud rate The GE Marquette monitor only sounds audible alarms for equipment interfaced through the Octanet interface module Silencing the N 395 audible alarm has no effect on the GE Marquette monitor sounding an alarm Note The parameters setup for the Marquette bedside monitor interface may be saved as institutional default settings see paragraph 4 5 Setting Institutional Defaults Sample page 4 8 Use care when performing this procedure because all settings will be saved as institutional default settings Section 10 Data Port Interface Protocol 10 2 4 Datex Ohmeda Communications The Datex Ohmeda monitor AS 3 must be configured for communications with the Nellcor N 200 monitor in order to communicate with the N 395 monitor Refer to the AS 3 operator s manual for instructions on configuring the AS 3 monitor The N 395 sends SpO2 pulse rate and alarm status data to the Datex AS3 monitor The RS 232 hardwire interface cable has a DB 15 connector for the N 395 and the applicable connector for the Datex monitor Nellcor cable part number 902255 is recommended for this interface Corrupt data will be indicated by a Communications Error displayed on the Datex monitor The Datex monitor will detect corrupt data in less t
22. its volume if patient safety could be compromised The SpaceLabs monitor provides both audible and visual alarm indications for equipment interfaced through the Universal FlexPort interface module Silencing the N 395 alarms will also silence the SpaceLabs monitor alarms The monitors must be able to sound an audible alarm in order to maintain patient safety Note The parameters setup for the SpaceLabs bedside monitor interface may be saved as institutional default settings see paragraph 4 5 Setting Institutional Defaults Sample page 4 8 Use care when performing this procedure because all settings will be saved as institutional default settings Marquette Communications The N 395 sends SpO2 pulse rate and alarm status data to the Marquette monitor The Marquette monitor requires an Octanet interface module to interface with the N 395 pulse oximeter The interface module comes with an interface cable GE Marquette part number 417961 033 that connects to the Nellcor interface cable The RS 232 hardwire interface cable has a DB 15 connector for the N 395 and the applicable connector for the Marquette Octanet interface module cable Nellcor cable part number 902254 is recommended for this interface Corrupt data will be indicated by a Communications Error displayed on the Marquette monitor The Marquette monitor will detect corrupt data in less than 7 seconds When the N 395 is in the Marquette mode of operation the
23. variation equals plus or minus one standard deviation 1SD which encompasses 68 of the population All accuracy specifications are based on testing the subject monitor on healthy adult volunteers in induced hypoxia studies across the specified range Adult accuracy determined with Oxisensor II D 25 sensors Neonatal accuracy determined with Oxisensor II N 25 sensors For a definition of motion as applicable to the N 395 contact Nellcor s Technical Services Department 2 Pulse rate accuracy is expressed as plus or minus X digits bpm across the display range This variation equals one standard deviation 1 SD which encompasses 68 of the population 9 3 Blank Page SECTION 10 DATA PORT INTERFACE PROTOCOL 10 1 Introduction 10 2 Configuring the Data Port 10 3 Connecting to the Data Port 10 4 Communications with a PC 10 5 Using Data on the PC 10 6 Real Time Printout 10 7 Trend Data Printout ASCII Mode 10 8 Trend Data Printout Graph Mode 10 9 Nurse Call 10 10 Analog Output 10 1 INTRODUCTION When connected to the data port on the back of the N 395 printouts can be obtained or patient data can be communicated to a Nellcor Oxinet Monitoring System or personal computer PC Analog signals representing SpO2 Pulse Rate and Pulse Amplitude are also provided by the data port A nurse call function is also available from the data port Each of these is discussed in more detail in the paragraphs that follow
24. 10 10 in this section Agilent HP Communications The N 395 sends SpO2 pulse rate and alarm status data to the Agilent monitor The Agilent monitor requires an Agilent VueLink Aux Plus B interface module to interface with the N 395 pulse oximeter The RS 232 hardwire interface cable has a DB 15 connector for the N 395 and the applicable connector for the Agilent monitor Nellcor cable part number 902256 is recommended for this interface Section 10 Data Port Interface Protocol A blank screen on the Agilent monitor will indicate corrupt data The Agilent monitor will detect corrupt data in less than 100 milliseconds When the N 395 is in the Agilent mode of operation the interface baud rate must be set to 19 200 bits per second Press the SETUP softkey then the NEXT softkey and then the COMM softkey to select BAUD Use the ADJUST UP or ADJUST DOWN buttons to select the correct baud rate WARNING Do not silence the N 395 audible alarm or decrease its volume if patient safety could be compromised The Agilent monitor only displays visual alarm indications for equipment interfaced through the Agilent VueLink Aux Plus B interface module The N 395 monitor must be able to sound an audible alarm in order to maintain patient safety Note The parameters setup for the Agilent bedside monitor interface may be saved as institutional default settings see paragraph 4 5 Setting Institutional Defaults Sample page 4 8
25. 2 GENERAL 9 1 General 9 2 Electrical 9 3 Physical Characteristics 9 4 Environmental 9 5 Alarms 9 6 Factory Default Settings 9 7 Performance Designed to meet safety requirements of UL 2601 1 CSA C22 2 No 601 1 M90 EN 60601 1 EN 865 EMC per EN 60601 1 2 and Canadian ICES 001 ELECTRICAL Protection Class Class I Degree of Protection Type BF Mode of Operation Continuous Battery Type Operating time Recharge period Fuses AC Power Selectable by switch Sensor Emission Compliance Rechargeable sealed lead acid internal 2 hours minimum on new fully charged battery under the following conditions no alarms no analog or serial output devices attached no RS 232 level nurse call output and backlight on 14 hours for full charge in standby 18 hours for full charge in use 2 each 5 x 20 mm Slow Blow 0 5 Amp 250 volts 100 120 VAC 50 60 Hz or 200 240 VAC 50 60 Hz 20 VA The wavelength of the light emitted is within the range of 500 nm to 1 000 nm with the energy not exceeding 10 mw EN 55011 CISPR 11 Group 1 Class B 9 1 Section 9 Specifications 9 3 PHYSICAL CHARACTERISTICS Dimensions 3 3 in H x 10 4 in W x 6 8 in D 8 4 cm H x 26 4 cm W x 17 3 cm D Weight 5 7 Ibs 2 6 kg 9 4 ENVIRONMENTAL Operating Temperature 5 C to 40 C 441 F to 104 F Storage Temperature 20 C to 70 C 4 F to 158 F Operating Altitude 390 m to 3 658 m 1 280 ft to 1
26. 2 000 ft Relative Humidity 15 RH to 95 RH noncondensing 9 5 ALARMS Alarm Limit Range Saturation 20 100 Pulse 30 250 bpm 9 6 FACTORY DEFAULT SETTINGS Table 9 1 Factory Default Settings Adult Monitoring Mode Adult SpO2 Lower Alarm Limit 85 volume setting of 5 Data Port Baud Rate Data Port Protocol Display Contrast Display Format Nurse Call Polarity Normally Low Pulse Beep Volume 72 dB A at 1 meter volume setting of 4 Pulse Rate Lower Alarm Limit 40 beats per minute Pulse Rate Upper Alarm Limit 170 beats per minute Trend Display SpO2 9 2 Section 9 Specifications Table 9 2 Factory Default Settings Neonate Monitoring Mode Neonate SpO2 Lower Alarm Limit 80 Pulse Rate Lower Alarm Limit 90 beats per minute Pulse Rate Upper Alarm Limit 190 beats per minute 9 7 PERFORMANCE Measurement Range SpO2 Pulse Heart Rate Accuracy Saturation SpO2 1 SD Without Motion Adults Neonates With Motion Adults and Neonates Pulse Rate Without Motion With Motion 1 100 20 250 bpm 70 to 100 2 digits 70 to 100 3 digits 1 to 69 unspecified 70 to 100 3 digits 1 to 69 unspecified 20 to 250 3 digits Normal physiologic range e g 55 125 bpm 5 digits Accuracies are expressed as plus or minus X digits saturation percentage points between saturations of 70 100 This
27. 31 The DSP controls the intensity of the LEDs in the sensor and the gain of the amplifiers receiving the return signals from the photodetector in the sensor Analog signals are received from the SpO2 circuit on the User Interface PCB An A D converts these signals to digital values for SpO2 and heart rate The values interpreted by the DSP and sent to the 331 to be displayed and stored 11 10 3 Sensor Output LED Control The SpO2 analog circuitry provides control of the red and IR LEDs such that the received signals are within the dynamic range of the input amplifier The variability in opacity of sensor application sites exceeds the range that can be accommodated by changing only the LED drive levels Therefore the DSP controls both the currents to the LEDs and the amplification in the signal channel At initialization of transmission the LEDs intensity level is based on previous running conditions and the transmission intensity is adjusted until the received signals match the range of the A D converter If the LEDs reach maximum output without the necessary signal strength the DSP will increase the channel gain The LED drive circuit switches between red and IR transmission and disables both for a time between transmissions in order to provide a no transmission reference To prevent excessive heat build up and prolong battery life each LED is on for only a small portion of the duty cycle Also the frequency of switching is well a
28. 4 PRINT Softkeys r 4 4 Figure 4 5 Trend 0 4 4 Figure 4 6 Errlog Printout R a aaa etre De iet 4 5 Figure 4 7 Instat Printout au au 4 5 Figure 4 8 INFO 0 4 6 Figure 4 9 NEXT Softkeys Nt 4 6 Figure 4 10 ALARMS Softkeys sse 4 6 Figure 4 11 Service Function 50 8 8 4 7 Figure 4 12 Service Function NEXT Softkey 4 7 Figure 4 13 Service Function ALARMS 4 7 Figure 4 14 Service Function Softkeys a 4 8 Figure 4 15 PARAM SoftkeyS pt 4 9 Figure 4 16 SAVE Softkeys 4 9 Figure 6 1 Fuse Removal 6 2 Figure 6 2 N 395 Corner Screws nennen 6 3 Figure 6 3 Separating Case 1 85 6 4 Figure 6 4 395 Battery 6 5 Fig
29. 800 NELLCOR or your local Nellcor representative REPLACEMENT LEVEL SUPPORTED The replacement level supported for this product is to the printed circuit board PCB and major subassembly level Once you isolate a suspected PCB follow the procedures in Section 6 Disassembly Guide to replace the PCB with a known good PCB Check to see if the trouble symptom disappears and that the monitor passes all performance tests If the trouble symptom persists swap back the replacement PCB with the suspected malfunctioning PCB the original PCB that was installed when you started troubleshooting and continue troubleshooting as directed in this section RETURNING THE N 395 Contact Nellcor Technical Services Department or your local Nellcor representative for shipping instructions including a Returned Goods Authorization RGA number Unless otherwise instructed by Nellcor s Technical Services Department it is not necessary to return the sensor or other accessory items with the monitor Pack the N 395 in its original shipping carton If the original carton is not available use a suitable carton with appropriate packing material to protect it during shipping Return the N 395 by any shipping method that provides proof of delivery 5 1 Section 5 Troubleshooting 5 6 OBTAINING REPLACEMENT PARTS Nellcor s Technical Services provides technical assistance information and replacement parts To obtain replacement parts contact Nellcor or your loca
30. 9 14 00 38 PS 01 Jul 99 14 00 40 PS 01 Jul 99 14 00 42 PS 01 Jul 99 14 00 44 PS N 395 VERSION 1 0 0 1 CRC XXXX 5001 Limit 30 100 PR Limit 100 180 bpm TIME SpO2 BPM PA Status 01 Jul 99 14 00 46 PS NELLCOR 25 VERSION 1 0 0 1 CRC XXXX SpO2Limit 80 100 PR Limit 100 180 bpm TIME SpO2 BPM PA Status 01 Jul 99 14 00 48 79 59 220 SL PL LB 01 Jul 99 14 00 50 79 59 PSSLPLLB Figure 10 4 Real Time Printout 10 6 1 Column Heading To explain the printout it will be necessary to break it down to its key components The first two lines of the chart are the Column Heading shown below Every 25th line a Column Heading is printed A column heading is also printed whenever a value of the Column Heading is changed There are three Column Headings shown in Figure 10 4 The third Column Heading was printed because the SpO2 limits changed from 30 100 to 80 100 N 395 VERSION 1 0 0 1 CRC XXXX SpO2Limit 30 100 PR Limit 100 180 bpm TIME SpO2 BPM PA Status Data Source VERSION 1 0 0 1 CRCXXXX SpO2Limit 30 100 PR Limit 100 180 bpm SpO2 BPM PA Status Data in the highlighted box above represents the source of the printout or display in this case the N 395 10 9 Section 10 Data Port Interface Protocol Software Revision Level VERSION 1 0 0 1 CRC XXXX SpO2 Limit 30 100 PR Limit 100 180 bpm PA Status The next data field tells the user the software level Version 1 0 0 1 and a software ve
31. A DRDY1 L ADSEL1 L cs POL REFIN SYNC REFIN STDBY BUFFER RESET AGND DGND Figure 11 6 404 Analog and Digital Schematic 11 17 THIS WHOLE SHEET IS ON 404 ISOLATED SIDE C47 664 C72 0 10 U29 8 FLASH 256KX8 DVDD 0 DVDD 1 DVDD 2 Note Place and route 0 1uf caps DVDD 3 DVDD 4 on same side as TMS320C32 DSP DVDD 5 DVDD 6 DVDD 7 DVDD 8 DVDD 9 DVDD 10 DVDD 11 VDDL 0 VDDL 1 VCCA C54 VDDL 2 VDDL 3 VDDL 4 VDDL 5 VDDL 6 VDDL 7 3 6864MHZ SM C51 22P U28 X1 CLK x2 CLK20MHZ Hee ERROR L ALOWSIG L A GND OUT CLKIN H1 H3 EMU0 EMU1 EMU2 EMU3 A GAIN4 L GAIN16 L A GAIN64 L ADSELO L A ADSEL1 L A ADSEL2 L DASEL L TCLK0 TCLK1 CLKR0 CLKX0 DR0 DRX FSR0 FSRX XF0 1 INTO INT1 INT2 INT3 IACK MCBL MP SHZ RESET VSUBS VSSL O VSSL 1 VSSL 2 D30 VSSL 3 D31 VSSL 4 VSSL 5 ST0 B0 CVSS 0 ST0 B1 CVSS 1 ST0 B2 CVSS 2 STO B3 CVSS 3 CVSS 4 ST1 BO CVSS 5 ST1 B1 CVSS 6 ST1 B2 DVSS 0 ST1 B3 DVSS 1 DVSS 2 IOSTRB DVSS 3 DVSS 4 R W DVSS 5 DVSS 6 IVSS 0 IVSS 1 IVSS 2 IVSS 3
32. DC Table 5 2 lists recommended actions to power problems Table 5 2 Power Problems Condition Recommended Action 1 Battery Low 1 Ensure that the N 395 is plugged into an operational indicator lights AC outlet and the AC indicator is on steadily while 2 Check the fuses The fuses are located in the Power Entry Module as indicated in paragraph 6 3 of the Disassembly Guide section 6 Replace if necessary N 395 is connected to AC and battery is fully charged 3 Open the monitor as described in section 6 Verify the power supply s output to the battery while on AC by disconnecting the battery leads from the battery and connect a DVM to them The voltage measured should be 6 80 VDC 0 15 VDC and the current should be 400 mA 80 mA Replace the power supply if above values are not met 4 Check the harness connection from the bottom enclosure to the User Interface PCB as instructed in paragraph 6 11 of the Disassembly Guide section If the connection is good replace the User Interface PCB The battery may be discharged To recharge the battery refer to paragraph 3 3 1 Battery Charge The monitor may be used with a less than fully charged battery but with a corresponding decrease in operating time from that charge 2 The N 395 does not operate when disconnected from AC power 3 Battery Low indicator on There are 15 minutes or less of usable charge left on the N 395 battery before the instrume
33. ED AREA Route with 0 020 trace to Sheet 1 mounting hole HM5 Figure 11 11 SIP SOP Interfaces Schematic 11 27 oto AO A1 A2 A3 A From Power Supply e battery backed power AT A8 A9 A10 A11 A12 RAMPWR RTCSEL SERDATA SERCLK A13 BATLEDDR A A14 ASLEDDR C169 C168 C179 C172 C178 C171 MOTNLEDDR 0 1U 0 1U 0 1U 0 1U 0 1U 0 1U Ae 2 417 17 0 18 A19 CS6 gt A20 CS7 1863 A21 CS8 32 768KHZ UARTCSL RESETL RER ICSD ROMLATECS Put grounded guard ring around Y3andc144 REAL TIME CLOCK A23 CS10 D 0 15 od IRESET 00 D1 IRP3 D2 10K 1356 1345 121 D7 BERRL 0 D8 HALTL ga D9 POTCSL L9 A60 BATT CHECK Y Y Y 2 BK LT ONL POTCSL CRIT BATT L Di LO R W NC RELAY 8 DSACK0 3 s 88 DSACK1 IDSACK1 UART IRQL DSL 13640 IDS ASL L7 xub 7 ocv ae 5042 SERCLK SIZ1 PWM_VOL PWMA IRMC SERDATA FONTSEL PWMB RA1 38 AC_OK L RA13 56 LOW BATT L BIN PRS L RICSEL le Note One ICT per Rpack suffices TURN OFF Ig IC3 DISP EN R WLR RWD_RST RDSPLRDL 061 EAM 062 IBKPT DSCLK BKPTL RPBCSL 063 IPIPE DSO IPIPEO RDSPLCSL 3820 AC_LED IPIPE1 064 IFETCH DSI FREEZE RXD FREEZE QUOT VDDI RXD TSTIME TSC FRONT END RS
34. ELBS MARQ and DATEX are only available in N 395 software version 1 7 and higher To change the communication protocol press SETUP NEXT COMM and SELECT Use the ADJUST UP DOWN buttons to select the desired communications protocol The baud rate may need to be changed to match the abilities of the attached equipment To change the baud rate press SETUP NEXT and COMM Use the ADJUST UP DOWN buttons to select a baud rate of 2400 9600 or 19200 Seven languages can be viewed on the screen and sent to the printer The language being used can be changed by pressing SETUP NEXT and LANG Use the ADJUST UP DOWN buttons to select the desired language The voltage polarity for the Nurse Call available at pins 11 and 5 can be selected through the softkeys By pressing SETUP NEXT NEXT and NCALL a choice of NORM or NORM is offered NORM sets the voltage to 5 VDC to 12 VDC and NORM sets the voltage to 5 VDC to 12 VDC when there is no audible alarm When an audible alarm occurs these voltages switch polarity This signal is available only if the instrument is operating on AC power For more information on Nurse Call see paragraph 10 9 in this section Analog calibration signals are provided to adjust a recorder to the output of the instrument Selectable calibration signals are 1 0 VDC 0 0 VDC and Step The signals are accessed by pressing SETUP NEXT NEXT and ANALOG For more information on the analog signals see paragraph
35. Figure 1 4 Trend Softkey Map 1 3 Figure 1 5 Setup Softkey Map 1 4 Figure 3 1 395 Controls 3 2 Figure 3 2 Self Test Display 3 2 Figure 3 3 Blip Magnified View 3 3 Figure 3 4 Adjusting SpO2 Upper Alarm 3 3 Figure 3 5 Adjusting SpO2 Lower Alarm 3 4 Figure 3 6 Adjusting High Pulse Rate 3 4 Figure 3 7 Adjusting Low Pulse Rate 3 4 Figure 3 8 SatSeconds 3 5 Figure 3 9 Data Port Pinouts 3 8 Figure 4 1 Service Function 50 8 8 4 2 Figure 4 2 Service Function Softkey 4 2 Figure 4 3 PARAM SoftkeyS et 4 3 Figure 4
36. LY REMOVAL REPLACEMENT Removal 1 Follow the procedure in paragraphs 6 2 and 6 4 2 Push the top of the Power Entry Module PEM in from the outside of the case and lift up 3 Use needle nose pliers to disconnect the leads from the PEM see Figure 6 5 4 Disconnect the fan wire harness from J1 on the Power Supply PCB see Figure 6 7 5 Use a 10 mm wrench to disconnect the Power Supply ground lead from the equipotential lug Figure 6 5 6 Remove the seven screws shown in Figure 6 6 7 Liftthe Power Supply out of the bottom case Figure 6 6 Power Supply 6 7 Section 6 Disassembly Guide Replacement 8 9 Reconnect the leads to the PEM following the instructions in Table 6 1 below and Figure 6 5 Table 6 1 Power Supply Lead Connections Wire Color Label Connects To Green amp Yellow Equipotential Lug Brown Labeled L Blue Labeled N Red Labeled Black Labeled Negative Battery Terminal L on the Power Entry Module N on the Power Entry Module Positive Battery Terminal Place the Power Supply in the bottom case Caution When installing the Power Supply 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 10 11 12 13 Install the seven screws in the Power Supply and tighten Connect the fan harness to J1 on the Power Supply Instal
37. Maintain O 2 inch clearance around J5 pins 1 and 4 MOTNLED ASLED BATLED PSLED Note This pin assignment is fixed DSPLRDL 4 VEE DSPLR WL DSPLRDL DSPLYCSL 5 DSPLYCSL 7 9 x RESETL BD0 BD1 BD2 BD3 BD4 15 805 806 47 BD7 19 x 1161 BDSPLYCSL TO LCD DISPLAY BD 7 0 ONBUTTON BDSPLYCSL 1435 1426 j 17 R156 L ONBUTTO 2 ACPWRLED SOFTKEY1 200K BATLED 3 11 13 MOTNLED 5 1 2 SOETKEY3 SOFTKEY21 7 SOFTKEY1 8 ACPWRLED 9 CNTRST SOFTKEY2 UP BTN CNTRST ALRMSI EE E Figure 11 16 filter cap for U34 U40 Display Interface and Drivers Schematic 11 37 SECTION 12 INDEX A Agilent HP Communications 10 3 Alarm Limit Ranges Default 3 3 Analog Output Test 3 8 Assembly Monitor 6 4 B Battery Charge 3 1 Maintenance 2 1 C Cleaning 2 1 D Data Port Analog Output 10 13 Communication with PC 10 7 Configuring 10 1 Connecting to 10 5 Interface Protocol 10 1 Nurse Call 10 12 Datex Communications 10 5 Disassembly Alarm Speaker 6 13 Battery Replacement 6 5 Display PCB 6 10 Fan 6 9 Fuse Replacement 6 2 Monitor 6 3 Power Entry Module 6 6 Power
38. N WC 1N914S 22 uA leakage from battery 6V Q4 3 2N3904 TH 1 BATT_CHK AAN s8 Ee w Battery 22GA_RED Battery 22GA_BLK Figure 11 3 Linear Power Supply Schematic 11 11 GAIN4 L GAIN16 L GAIN64 L 12VA 5VA 0 O C153 0 1U THIS WHOLE SHEET IS ON 12VA 5VA 1102 404 ISOLATED SIDE OFF ON 12VA C125 0 1U 25V VREF 227 U61B 147451202 U67C 0 1U 15033 25V R168 1 ANN SPARE GATE 12VA 1201 12VA 5VA 2200P 50V 1249 h R186 C134 1 00K 100P 2 12VA LED OVER A U61A 50V 1222 147450 9 R202 49 9K 1223 DIFSIG C140 C139 100P 59V 0 1U DIFSIG 12VA 5VA 12VA 5VA 4 O O 1247 1225 1240 1239 O 121 2VA 5VA 12VA 5VA U62A25V 14523 11431119 F 0 231 q lt 131 i LED SIG OFF ON ADSEL2 L IRLED CURRENT RLED CURRENT DSP RST L TEST ZERO A 144 ZERO TE U32D 15018 Figure 11 4 404 Analog Front End Schematic 11 13 RDIFSIG__ 12VA RDIFSIG ERROR L LT OUT 12VA 5VA C163 0 C157 0 1U 0 1U 12VA 5VA O U72D 13572 1105 1257 12VA 5VA 12VA 5
39. N 395 Pulse Oximeter Service Manual O Q x x 2 SpO2 To obtain information about a warranty if any for this product contact Nellcor Technical Services 1 800 NELLCOR or your local Nellcor representative Nellcor Puritan Bennett Inc is an affiliate of Tyco Healthcare Nellcor Nellcor Puritan Bennett Durasensor and Oxisensor IT are trademarks of Nellcor Puritan Bennett Inc 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 4 869 254 5 078 136 5 351 685 and 5 368 026 TABLE OF CONTENTS List of Figures List of Tables TABLE OF i iii List of Tables Hed ete Ee iii SECTION 1 Introduction J nnne J J J 1 1 1 1 Manual OvetView cde tiie dae 1 1 1 2 Description of N 395 Pulse 1 1 1 3 Related Documents 1 5 SECTION 2 Routine Maintenance
40. Supply 6 7 Prior to 6 1 UIF PCB 6 11 Disassembly Guide 6 1 F Factory Default Settings 4 1 Front Panel Figure 1 2 Functional Block Diagram 11 3 L LED Excitation Test 3 9 Limits Softkey Map 1 3 M Manual Overview 1 1 Marquette Communications 10 4 Messages Disallowed on Battery 5 7 Disallowed on Low Battery 5 7 Invalid Silence Duration 5 7 Invalid SpO2 Limit 5 7 Reading Trend 5 8 Sensor Disconnected 5 8 Sensor Off 5 8 Motion 11 3 N N 395 Description 1 1 O Operation with a Patient 3 10 Oximetery Overview 11 1 P Packing Different Carton 8 3 Original Carton 8 2 Packing for Shipment 8 1 Parts Replacement Level 5 1 Performance Tests 3 1 Performance Verification 3 1 Power On Defaults 3 3 Power On Self Test 3 2 Power On Settings 4 1 Power Up Performance 3 2 Printouts 10 8 Trend Data 10 11 Pulse Oximeter Tester 3 5 Alarm Volume Control 3 7 Alarms 3 6 Dynamic Operating Range 3 7 Nurse Call 3 8 Pulse Tone Volume Control 3 7 Pulsee Oximeter Tester Alarm Silence 3 6 R Rear Panel Figure 1 2 Related Documents 1 5 12 1 Section 12 Index Repairs Who Should Perform 5 1 Returning the N 395 5 1 Routine Maintenance 2 1 S Safety Tests 3 10 SatSeconds Alarm Management 11 2 Saturation Calculated 11 2 Fractional 11 1 Functional 11 1 Measured 11 2 Service Functions 4 1
41. TL J SHOOT RBOOTROM BOOTROML RRAMLCSL alan lok RAMLCSL TX485 EN ex 1 44 RRAMHCSL RAMHCSL CLK156KHZ 118 RDSPLCSL DSPLYCSL SIPSOP EN M RDSPLRDL MOSI FCO CS3 RPBCSL DSPLRDL IPCS0 SS FC1 ICS4 13900 B IPCS4 FC2 ICSS PSLEDDR uen RESETL PCS2 O L3 IPCS3 A601 b b b D D b P bb Db AAD D D D 4 CLKOUT CLKOUT O VDD RESETH R42 R47 VDDI 10 0 lt gt 10 0K MODCLK 13620 3 vopsvw VDDSYN H 10N1147 p C44 0 1U 1956 O 1363 1 O 1336 BACKGROUND DEBUG CONNECTOR 1360 1361 VDD Y2 32 768KHZ RESETL IPIPEO 0 Figure 11 12 SM 22P Note Encircle C130 and 50V i signal with 10 12 mil o J MC331 CPU Core Schemtic trace VDDSYN 11 29 Place and Route bypass caps on same side as 29F200 VDD A 17 0 1453 1455 1457 1450 asd ase 1454 1458 145 o7 RESETL BOOTROML BOOTFLSHL FRAMPWR A 17 0 gt z WIN c b On 1 gt gt gt A10 29 11 8 A12 A13 4 A14 28 A15 16 17 5153575051515 RAMHCSL RAMLCSL 9 RESETL 30 RESETL L4 R WL a R WL RESETL
42. Use care when performing this procedure because all settings will be saved as institutional default settings 10 2 2 SpaceLabs Communications The N 395 sends SpO2 pulse rate and alarm status data to the SpaceLabs monitor Figure 10 2 illustrates the connections between the N 395 and the SpaceLabs Monitor INTERFACE SPACELABS CABLE ADAPTER D36341 SPACELABS UNIVERSAL FLEXPORT 395 SPACELABS CABLE SPACELABS MONITOR Figure 10 2 SpaceLabs Connection Caution The SpaceLabs monitor must be turned on before the N 395 monitor is turned on The SpaceLabs monitor requires a Universal FlexPort interface module to interface with the N 395 pulse oximeter The RS 232 hardwire interface cable has a DB 15 connector for the N 395 and the applicable connector for the SpaceLabs monitor Nellcor cable part number 036341 is recommended for this interface Corrupt data will be indicated by a Communications Error displayed on the SpaceLabs monitor The SpaceLabs monitor will detect corrupt data in less than 11 seconds 10 3 Section 10 Data Port Interface Protocol 10 2 3 10 4 When the N 395 is in the SpaceLabs mode of operation the interface baud rate must be set to 9 600 bits per second Press the SETUP softkey then the NEXT softkey and then the COMM softkey to select BAUD Use the ADJUST UP or ADJUST DOWN buttons to select the correct baud rate WARNING Do not silence the N 395 audible alarm or decrease
43. VA U724 13569 THIS WHOLE SHEET IS ON 404 ISOLATED SIDE 12VA DIFSIG 1173 RDIFSIG DIFSIG Z R201 249K_0 1 C185 0 1U 25V RDIFSIG 1 2 249 _0 1 1221 9 U66B 14021 LOWSIG L A PRE AMP Figure 11 5 404 Analog Front End and Pre Amp Schematic 11 15 VCCA 0 0 4 R230 R231 9 US 10 0K OFF ON IR RED RSMP L IRSMP L LED OVER CLK1 250MHZ CLKA624KHZ C53 0 01U U30 74HC4040 CLK20MHZ 12VA VCCA 5VA 0 0 1432 1175 1171 1178 1177 TLC1541 C10 0 1 25V THIS WHOLE SHEET IS ON 404 ISOLATED SIDE 5VA 5VA O C114 R147 L 0 10 10 0K 0 1 25V V VREF VREF O 1179 1182 VCC 2 25V DVDD CLKIN CLKOUT SCLK DIN 26 1181 1164 1162 145 165 163 O ADSEL2 L A CLK1_250MHZ SCLK A DXO DRO pour 25 DRDY pm cs POL O O REFIN SYNC Pa REFIN STDBY Pe BUFFER RESET D 6 AGND DGND AD7714 25V AD7714 DVDD CLKIN CLKOUT 56 H L DIN DOUT DRDY VCCA 1161 1160 6 DRDYO L ADSELO L A DSP_RST L
44. atient Isolation Risk Current The leakage test lead from the test equipment must be connected to the N 395 SpO2 Sensor Port using a male 9 pin D type connector that has all pins shorted together SECTION 4 POWER ON SETTINGS AND SERVICE FUNCTIONS 4 1 Introduction 4 2 Power on Settings 4 3 Factory Default Settings 4 4 Service Functions 4 5 Setting Institutional Defaults Sample 4 1 INTRODUCTION This section discusses how to reconfigure power on default values and access the service functions 4 2 POWER ON SETTINGS The following paragraphs describe how to change power on default settings By using softkeys as shown in Figure 1 1 the user can change alarm limits the type of display baud rate time and date and trends to view Some values cannot be saved as power on default values An SpO2 Lower Alarm limit less than 80 will not be saved as a power on default Audible Alarm Off will not be accepted as a power on default An attempt to save either of these values as default will result in an invalid tone These limits can be adjusted lower for the current patient but they will be lost when the instrument is turned off A decimal point is added to the right of a display when the alarm limit for that display has been changed to a value that is not a power on default value If the new value is saved as a power on default value the decimal point will be removed By using the service functions changes can be saved as power
45. atient data section of the printout 10 7 TREND DATA PRINTOUT ASCII MODE The format of data displayed when a trend printout is requested is similar to that of the real time data The only differences are that TREND is displayed in the top row instead of the CRC XXXX software verification number and there is no Status column Figure 10 5 Readings are displayed in 4 second intervals The values on each row are an average for the 4 second period At the end of the printout an Output Complete line indicates that the transmission was successful If the Output Complete line is not present the data should be considered invalid VERSION 1 0 0 1 TREND SpO2 Limit 30 100 PR Limit 100 180 bpm TIME SpO2 PR bpm PA 22 Nov 99 14 00 05 100 120 150 22 Nov 99 14 00 09 100 121 154 22 Nov 99 14 00 13 100 120 150 Output Complete Figure 10 5 Trend Data Printout ASCII Mode 10 11 Section 10 Data Port Interface Protocol 10 8 10 9 10 12 TREND PRINTOUT GRAPH MODE The graph mode Figure 10 6 disables all printout functions except trend data Trend printouts will be graphical if connected to a serial printer that supports Epson ESC protocol ZHR TREND i 168 WSPOR T Figure 10 6 Trend Data Printout GRAPH MODE NURSE CALL An RS 232 Nurse Call signal pins 5 and 11 can be obtained by connecting to the data port It is in the form of a positive or negative voltage chosen by the user The
46. bove that of motion artifact and is selected to avoid low harmonics of 50 Hz and 60 Hz power line frequencies The IR transmission alone and the red transmission alone will each be on for about one fourth of the duty cycle 11 10 4 Input Conditioning 11 10 5 Signal Gain Input to the SpO2 analog circuit is the current output of the sensor photodiode In order to condition the signal current it is necessary to convert the current to voltage Because the IR and red signals are absorbed differently by body tissue their received signal intensities are at different levels Therefore the IR and red signals must be demodulated and then amplified separately in order to compare them to each other De multiplexing is accomplished by means of two circuits that alternately select the IR and red signals Two switches that are coordinated with the IR and red transmissions control selection of the circuits A filter with a large time constant follows to smooth the signal and remove noise before amplification The separated IR and red signals are amplified so that their DC values are within the range of the A D converter Because the received IR and red signals are typically at different current levels the signal gain circuits provide independent amplification for each signal as needed The gain in these circuits is adjusted by U68 U53 and U54 After the IR and red signals are amplified they are filtered to improve the signal to noise ratio and clamp
47. component that protects the battery SW2 opens and turns the charging circuit off if the temperature of the battery rises above 50 C If the output of the battery exceeds 5 0 amps F3 opens F3 protects the battery from a short to ground of the battery output Protection from the battery is provided in the event the battery is connected backwards Components on the User Interface PCB and the Power Supply block and limit the voltage to provide protection to circuits in the instrument A lead acid battery is used in the N 395 It is rated at 6 VDC 4 amp hours When new and fully charged the battery will operate the monitor for 2 hours under the following conditions no alarms no analog or serial output devices attached no RS 232 level nurse call output and backlight on The battery can withstand 400 charge discharge cycles Recharging the battery to full capacity from a completely discharged battery will take 14 hours in standby or 18 hours if the instrument is being used Changeover from AC to battery power will not interrupt the normal monitoring operation of the N 395 However when the unit is running on battery power the cooling fan will be turned off The CPU on the User Interface PCB monitors the charge level of the battery If the voltage of the battery falls below 5 85 0 1 VDC a low battery alarm is declared The instrument will continue monitoring and alarming for 15 minutes and then power down This 15 minute alarm and power d
48. ction 4 Power On Settings and Service Functions SELECT The SELECT softkey is used to select what function of the audible alarm is going to be changed A box can be cycled between two choices ALLOW OFF and OFF REMINDER How to select and set ALLOW OFF and OFF REMINDER 1 Disconnect sensor from monitor Note If the sensor is not disconnected the only softkeys on the screen will be PARAM and EXIT 2 Simultaneously press the fourth softkey from the left and the CONTRAST softkey for more than 3 seconds The menu bar will change to the softkey headings shown in Figure 4 11 Figure 4 11 Service Function Softkeys 3 Press the NEXT softkey Figure 4 12 Service Function NEXT Softkey 4 Press the ALARMS softkey ALARM ALLOW OFF OFF REMINDER Figure 4 13 Service Function ALARMS Softkey 5 Use the UP ARROW or DOWN ARROW buttons to cycle between YES and NO Use the SELECT softkey to toggle between ALLOW OFF and OFF REMINDER 6 Press the EXIT softkey 4 7 Section 4 Power On Settings and Service Functions When ALLOW OFF is selected a choice is given between allowing an audible alarm OFF or disabling the audible alarm OFF Pressing the UP or DOWN ARROW key cycles between Yes and No If Yes is selected the operator has the option of selecting AUDIBLE ALARM OFF If No is selected the operator is not given the option of selecting AUDIBLE ALARM OFF as an alarm silence duration choice If the audibl
49. e 3 7 Figure 3 7 Adjusting Low Pulse Rate Alarm Press and hold the DOWN ARROW button Verify that the boxed Pulse lower alarm limit display reduces to a minimum of 30 Press and hold the UP ARROW button and verify that the boxed Pulse lower alarm limit display cannot be adjusted above the Pulse high limit of 40 Press the LIMITS softkey and then press the SELECT softkey two times Verify that SatSeconds SECS alarm is selected See Figure 3 8 11 12 13 14 15 16 17 18 19 Section 3 Performance Verification Rilo Figure 3 8 SatSeconds Alarm Press the UP ARROW button repeatedly and verify that the SatSeconds alarm display cycles from OFF through 10 25 50 100 OFF Press the POWER ON OFF button to turn the monitor off Press the POWER ON OFF button to turn the N 395 back on Press and release the LIMITS softkey Verify that the SpO2 upper alarm limit display is boxed and indicates an alarm limit of 100 Press the SELECT softkey Verify that the 5002 lower alarm limit display is boxed and indicates an alarm limit of 85 Press the SELECT softkey Verify that the SatSeconds SECS alarm is set to OFF Press the SELECT softkey Verify that the Pulse upper alarm limit display is boxed and indicates an alarm limit of 170 Press the SELECT softkey Verify that the Pulse lower alarm limit display is boxed and indicates an alarm limit of 40 Press the POWER ON OFF button to turn t
50. e 5 1 Problem Categories 5 2 Table 5 2 Power Problems 5 3 Table 5 3 Button Problems 5 4 Table 5 4 Display Alarms 5 4 Table 5 5 Operational Performance 5 5 Table 5 6 Data Port PrODISWI8 u 5 6 Table 5 7 Errot Codes caeca 5 6 Table 6 1 Power Supply Lead 600086 008 6 8 SG 7 1 Table 9 1 Factory Default Settings Adult 9 2 Table 9 2 Factory Default Settings Neonate 9 3 Table 10 1 Data Port Pin Outs enne 10 6 Table 10 2 Printout Codes 10 11 Table 10 3 Nurse Call Relay Pin States 10 12 Table 10 4 Rating of Nurse Call 10 13 SECTION 1 INTRODUCTION 1 1 Manual Overview 1 2 Description of N 395 Pulse Oximeter 1 3 Related Documents 1 1 MANUAL OVERVIEW The latest version of this manual is available on t
51. e Assembly Membrane Panel Included Bottom Enclosure Cover not called out Fuse Drawer Fuses Power Entry Module Cooling Fan Power Supply Display PCB Battery Battery Bracket User Interface PCB Alarm Speaker not shown Rubber Feet not shown Power Cord not shown e USA International UK Ireland Tilt Stand not shown GCX Mounting Kit not shown roll stand or wall mount Sensor Lock SCP 10 MC 10 Cables including pins not shown 036562 035318 691500 691032 691499 035469 SP036478 SP036333 640119 035307 SP036261 033494 4 0038 18 00 049798 901862 901863 891340 035434 040493 7 1 Section 7 Spare Parts Figure 7 1 shows the N 395 expanded view with numbers relating to the spare parts list Figure 7 1 N 395 Expanded View 7 2 SECTION 8 PACKING FOR SHIPMENT 8 1 Introduction 8 2 General Instructions 8 3 Repacking in Original Carton 8 4 Repacking in a Different Carton 8 1 INTRODUCTION To ship the monitor for any reason follow the instructions in this section 8 2 GENERAL INSTRUCTIONS Pack the monitor carefully Failure to follow the instructions in this section may result in loss or damage not covered by any applicable Nellcor warranty If the original shipping carton is not available use another suitable carton North American customers may call Nellcor Technical Services Department to obtain a shipping carton Prior to shipping the moni
52. e alarm is set to Off a reminder tone can be sounded every 3 minutes to notify the user of this condition The UP and DOWN ARROW keys can be used to change the choice from Yes to No Selecting Yes enables the Reminder Selecting No disables the Reminder when the audible alarm is set to Off 4 5 SETTING INSTITUTIONAL DEFAULTS SAMPLE The following default values may be set 4 8 Alarm Silence Duration 30 60 90 120 seconds Alarm Silence Restriction none sound reminder do not allow OFF Alarm Volume 1 to 10 Nurse Call Priority RS 232 normally high normally low Pulse Beep Volume 0 to 10 Pulse Rate Upper Alarm Limit low limit to 250 bpm Pulse Rate Lower Alarm Limit 20 bpm to high limit SatSeconds OFF 10 25 50 100 Serial Port Baud Rate 2400 9600 19200 Serial Port Mode ASCII OXINET CLINICAL GRAPH AGILEN Agilent HP monitor SPACELB SpaceLabs monitor MARQ GE Marquette monitor DATEX Datex Ohmeda AS 3 monitor Available selections depend on the software installed in your N 395 SpO2 Upper Alarm Limit low limit to 100 SpO2 Lower Limit 80 to high limit Disconnect sensor from monitor If the sensor is not disconnected the only softkeys on the screen will be PARAM and EXIT Set desired values to the institutional values Simultaneously press the LIGHT softkey and the CONTRAST button for more than 3 seconds The menu bar will change to the softkey headings shown in Figure 4 14
53. e fan control circuit uses the negative output The positive output is the Main DC ranging from 7 to 18 VDC This positive voltage is used for the battery circuit and to power the User Interface PCB A fan control circuit on the Power Supply PCB is used to control the temperature inside the case of the N 395 The temperature sensor used in this circuit is U3 U3 turns on the cooling fan if the temperature inside the case exceeds approximately 31 C The cooling fan runs on approximately 15 VDC Note The fan is disabled if the unit is running on battery power Battery Circuits Two circuits are included in this section of the Power Supply PCB One circuit is used to charge the battery and the other circuit provides battery protection Charging Circuit The Power Supply will charge the battery while the N 395 is connected to AC power even if the monitor is not turned on The voltage applied to the battery is 6 8 0 15 VDC and is current limited to 400 80 mA Battery voltage is checked periodically by the processor A signal from the processor turns the charging circuit off to allow this measurement to be taken If the processor determines the battery voltage is below 5 85 0 1 VDC a low battery alarm is declared 11 9 BATTERY Section 11 Technical Supplement Battery Protection Two types of battery protection are provided by the Power Supply protection for the battery and protection from the battery SW2 is a resettable
54. e the language to be used adjust the internal time clock and change communications protocol The N 395 can operate on AC power or on an internal battery The controls and indicators for the N 395 are illustrated in Figure 1 1 and Figure 1 2 1 1 Section 1 Introduction 18 18 17 16 15 18 13 12 41 1 SpO2 Sensor Port 11 Adjust Up Button 2 AC Battery Charging Indicator 12 Adjust Down Button 3 Power On Off Button 13 Neonate Indicator 4 Low Battery Indicator 14 Contrast Button 5 Waveform Display Area 15 Softkeys 6 SatSeconds Indicator 16 Menu Bar 7 SpO2 Indicator 17 Motion Indicator 8 Pulse Rate Display 18 Pulse Search Indicator 9 Alarm Silence Indicator 19 Speaker 10 Alarm Silence Button Figure 1 1 N 395 Front Panel 1 Equipotential ground Terminal 4 Fuse Receptacle 2 AC Inlet 5 Voltage Selection Switch 3 DB 15 Interface Connector Data Port Figure 1 2 N 395 Rear Panel Figures 1 3 1 4 and 1 5 illustrate the various functions that are available through the use of the softkeys and how to access them A complete explanation of the keys is provided in the N 395 operator s manual 1 2 Section 1 Introduction LIMITS SELECT NEC ADULT EXIT Figure 1 3 Limits Softkey Map TREND VIEW DUAL SPO2 PULSE NEXT HIST VIEW NEXT DELETE L DELETE TRENDS YES NO PRINT MEXT EXIT EXIT NEXT ZOOM NEXT DELETE LL DELETE TRENDS YES NO PRINT NEXT EXIT EXIT Figure 1 4 Trend
55. ed to a reference voltage to prevent the combined AC and DC signal from exceeding an acceptable input voltage from the A D converter Section 11 Technical Supplement 11 10 6 Real Time Clock RTC Real time is tracked by the N 395 As long as battery power or AC power is available the instrument will keep time If the battery is removed the time clock will have to be reset The LCD will display the time and date for the data period highlighted by the cursor on a trend display A time stamp is printed for each line of data on a printout Real time data is displayed and printed as Day Month Year Hours Minutes and Seconds 11 10 7 Patient Data Storage Patient data is captured and stored once every 4 seconds A maximum of 48 hours of trend data can be stored Up to 50 alarm limit changes can be retained If battery power is disconnected or depleted trend data and user settings will be lost All data is stored with error detection coding If data stored in memory is found to be corrupted it is discarded 11 11 FRONT PANEL DISPLAY PCB AND CONTROLS 11 11 1 Display PCB The Front Panel Display PCB provides visual patient data and monitor status At power up all indicators and pixels are illuminated to allow verification of their proper operation Next the NELLCOR logo and the software revision level are displayed After this cycle has been completed the instrument is ready to begin monitoring The LCD allows the user to select amo
56. eld Section 10 Data Port Interface Protocol 10 4 COMMUNICATIONS WITH A PC Data can be sent from the N 395 to a PC by using a data cable with a Null modem connector installed between the instrument and the PC Select the ASCII Comm protocol Data sent to the PC is serial 8 data bits no parity 1 stop bit XON XOFF flow control and is space delineated When the connection is made real time data will be sent to the PC A new line of data will be sent every 2 seconds The information presented will be the same as described in Real Time Printouts later in this section Holding the Control key on the PC keyboard and pressing C twice can access an interactive mode When the interactive mode has been accessed real time serial output is stopped and serial input is accepted Printouts can be requested or the date and time can be adjusted via the PC The PC monitor will display 5 options 1 Dump Instrument Info 2 Set Date and Time 3 Dump Trend 4 Dump Error Log 5 Exit Interactive Mode Dump Instrument Info This allows Instrument Info to be printed or displayed on the PC screen This option is intended for Nellcor field service personnel Instrument Info is a single line of data which includes software version CRC number and total operating time Date and Time When the instrument is shipped from the factory the date and time are set to the Time Zone at the manufacturer If the battery has been removed or disconnected the time
57. eter In this example the SpO2 is 100 and the pulse rate PR is 190 beats per minute The asterisk next to the 190 indicates that 190 beats per minute is outside of the alarm limits indicated in the top row for pulse rate If no data for a parameter is available three dashes will be displayed in the printout Pulse Amplitude PA can range from 0 to 254 There are no alarm parameters for this value It can be used for trending information and is an indication of a change in pulse volume pulse strength or circulation Operating Status N 395 VERSION 1 0 0 1 CRC XXXX SpO2 Limit 30 100 PR Limit 100 180 bpm TIME SpO2 BPM 01 Jul 97 14 00 06 100 190 10 10 Section 10 Data Port Interface Protocol The Status column indicates alarm conditions and operating status of the N 395 In this example the PH means Pulse High The status codes are listed in Table 10 2 As many as 4 codes can be displayed at one time in the Status column Table 10 2 Printout Codes Code Meaning BU Batterv in Use LB Low Battery AS Alarm Silence AO Alarm Off SD Sensor Disconnect PS Pulse Search LP Loss of Pulse SH Sat High Limit Alarm SL Sat Low Limit Alarm PH Pulse Rate High Limit Alarm PL Pulse Rate Low Limit Alarm MO Motion LM Loss of Pulse with Motion No Data Available Alarm Parameter Being Violated Note A Sensor Disconnect will also cause three dashes to be displayed in the p
58. han 11 seconds When the N 395 is in the Datex mode of operation the interface baud rate must be set to 2 400 bits per second Press the SETUP softkey then the NEXT softkey and then the COMM softkey to select BAUD Use the ADJUST UP or ADJUST DOWN buttons to select the correct baud rate WARNING Do not silence the N 395 audible alarm or decrease its volume if patient safety could be compromised The Datex Ohmeda monitor does not indicate audible or visual alarms for equipment interfaced The N 395 monitor must be able to sound an audible alarm in order to maintain patient safety Note The parameters setup for the Datex Ohmeda bedside monitor interface may be saved as institutional default settings see paragraph 4 5 Setting Institutional Defaults Sample page 4 8 Use care when performing this procedure because all settings will be saved as institutional default settings 10 3 CONNECTING TO THE DATA PORT Data is transmitted in the RS 232 format pins 2 3 and 5 or RS 422 pins 1 4 9 and 12 RS 232 data can be transmitted a maximum of 25 feet RS 422 up to 4000 feet The pin outs for the data port are listed in Table 10 1 10 5 Section 10 Data Port Interface Protocol 10 6 Table 10 1 Data Port Pin Outs Pin Signal 1 RXD RS 422 positive input 2 RXD 232 RS 232 input 3 TXD 232 RS 232 output 4 TXD RS 422 positive output 5 Signal Ground isolated from earth ground 6 AN_SpO2 ana
59. he Internet at http www mallinckrodt com respiratory resp Serv Supp ProductManuals html This manual contains information for servicing the Nellcor model N 395 pulse oximeter Only qualified service personnel should service this product Before servicing the N 395 read the operator s manual carefully for a thorough understanding of operation WARNING Explosion hazard Do not use the N 395 pulse oximeter in the presence of flammable anesthetics 1 2 DESCRIPTION OF N 395 PULSE OXIMETER The N 395 pulse oximeter is indicated for the continuous non invasive monitoring of functional oxygen saturation of arterial hemoglobin SpO2 and pulse rate The N 395 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 type environments include surgicenters including physician office based facilities sleep labs and skilled nursing facilities Use with any particular patient requires the selection of an appropriate oxygen transducer as described in the operator s manual Motion performance claims are applicable to Nellcor models D 25 N 25 I 20 D 20 and D 25L oximetry sensors Through the use of the four softkeys the operator can access trend information select an alarm limit to be changed choos
60. he monitor off 3 3 3 Operation with a Pulse Oximeter Tester Operation with an SRC 2 pulse oximeter tester includes the following tests e 3 3 3 1 Alarms and Alarm Silence e 3 3 3 2 Alarm Volume Control e 33 33 Pulse Tone Volume Control e 3 3 3 4 Dynamic Operating Range e 3 3 3 5 Nurse Call e 3 3 3 6 Analog Output e 3 3 3 7 Operation on Battery Power 3 5 Section 3 Performance Verification 3 3 3 1 3 6 Alarms and Alarm Silence 1 Connect the SRC 2 pulse oximeter tester to the sensor input cable and connect the cable to the monitor Set the SRC 2 as follows SWITCH POSITION RATE 38 LIGHT LOW MODULATION OFF RCAL MODE RCAL 63 LOCAL Press the POWER ON OFF button to turn the monitor on After the normal power up sequence press the following softkeys SETUP VIEW and PLETH Verify that the SpO2 and Pulse initially indicate zeroes Move the modulation switch on the SRC 2 to LOW Verify the following monitor reactions a The plethysmograph waveform begins to track the artificial pulse signal from the SRC 2 b The pulse tone is heard c Zeroes are displayed in the SpO2 and Pulse displays d Within 20 seconds the monitor displays saturation and pulse rate as specified by the tester Verify that the values are within the following tolerances Oxygen Saturation Range 79 to 83 Pulse Rate Range 37 to 39 bpm e The audible alarm sounds and both the SpOz and Pulse displays flash indicating that both
61. include all data recorded for up to 48 hours of monitoring since the last Delete Trends was performed A new trend point is recorded every 4 seconds Figure 4 5 is an example of a Trend printout N 395 Version 1 0 0 000 TREND SpO2 Limit 30 100 PR Limit 100 180 bpm TIME SpO2 PR bpm 01 Jul 99 14 00 00 100 120 01 Jul 99 14 00 05 100 124 01 Jul 99 14 00 10 100 190 01 Jul 99 14 00 15 01 Jul 99 18 00 43 01 Jul 99 18 00 48 N 395 Version 1 0 0 000 Trend SpO2 Limit 80 100 PR Limit 60 180 bpm Time SpO2 PR bpm PA 01 Jul 99 18 00 53 01 Jul 99 18 00 58 01 Jul 99 18 01 03 98 01 Jul 99 18 01 08 98 01 Jul 99 18 01 13 99 Output Complete Figure 4 5 Trend Printout The first row of the printout includes information about the type of instrument delivering the information the software level type of printout and alarm parameters The second line lists the headings for the columns These lines are printed out every 25 lines or when a change to an alarm limit is made Patient data is represented with a date and time stamp for the data In the example above the means that a sensor was connected but the signal quality of the data being received was too low for the monitor to interpret the data Patient data that is outside of an alarm limit is marked with an asterisk At the end of the printout Output Complete will be printed This indicates that there was no corruption of data If the O
62. is compatible real time data will begin to be displayed on the PC Capture the text to a file Use Control C to stop data flow Import the data file into the spreadsheet The data can now be manipulated by the commands of the spreadsheet Some formatting of the data may be necessary REAL TIME PRINTOUT When a real time display or printout is being transmitted to a printer or PC a new line of data is printed every 2 seconds Every 25th line is a Column Heading line A column heading line is also printed any time a value in the column heading line is changed A real time printout is shown in Figure 10 4 Note If the data output stops transmitting turn the power off and back on again or if the monitor is connected to a PC send an XON Ctrl q to resume transmission Section 10 Data Port Interface Protocol N 395 VERSION 1 0 0 1 CRC XXXX 5001 Limit 30 100 PR Limit 100 180 bpm TIME SpO2 BPM PA Status 01 Jul 99 14 00 00 100 120 220 01 Jul 99 14 00 02 100 124 220 01 Jul 99 14 00 04 100 190 220 01 Jul 99 14 00 06 100 190 220 01 Jul 99 14 00 08 100 190 220 01 Jul 99 14 00 10 100 190 220 01 Jul 99 14 00 12 100 190 220 01 Jul 99 14 00 14 100 190 220 01 Jul 99 14 00 16 100 190 220 01 Jul 99 14 00 18 100 190 220 01 Jul 99 14 00 20 01 Jul 99 14 00 22 01 Jul 99 14 00 24 01 Jul 99 14 00 26 SD 01 Jul 99 14 00 28 SD 01 Jul 99 14 00 30 SD 01 Jul 99 14 00 32 SD 01 Jul 99 14 00 34 PS 01 Jul 99 14 00 36 PS 01 Jul 9
63. l Nellcor representative Refer to parts by the part names and part numbers listed in Section 7 Spare Parts The latest version of this manual is available on the Internet at http www nellcor com respiratory resp Serv_Supp ProductManuals html 5 7 TROUBLESHOOTING GUIDE Problems with the N 395 are categorized in Table 5 1 Refer to the paragraph indicated for further troubleshooting instructions Note Taking the recommended actions discussed in this section will correct the majority of problems you may encounter However problems not covered here can be resolved by calling Nellcor Technical Services at 1 800 NELLCOR or your local Nellcor representative Table 5 1 Problem Categories Problem Area Refer to Paragraph Power 324 e No power up on AC and or DC e Fails power on self test e Powers down without apparent cause Buttons 5 12 e Monitor does not respond properly to buttons Display Alarms 5 7 3 e Displays do not respond properly e Alarms or other tones do not sound properly or are generated without apparent cause Operational Performance 5 7 4 e Displays appear to be operational but monitor shows no readings e Suspect readings Data Port 5 7 5 e N 395 data port not functioning properly All of the categories in Table 5 1 are discussed in the following paragraphs 5 2 Section 5 Troubleshooting 5 7 1 Power Power problems are related to AC and or
64. l the PEM in the bottom case with the fuse drawer facing down A tab in the bottom case holds the PEM in place Insert the bottom wing of the PEM between the tab and the internal edge of the sidewall of the bottom case Push the PEM down and towards the outside of the monitor until it clicks into place Complete the replacement procedure in paragraph 6 5 Section 6 Disassembly Guide 6 9 COOLING FAN REMOVAL REPLACEMENT Removal 1 Complete the procedure in paragraphs 6 2 and 6 4 2 Disconnect the fan wire harness from J1 on the Power Supply PCB see Figure 6 7 3 Lift the cooling fan from the slots in the bottom case Figure 6 7 Cooling Fan Replacement 4 Connect the cooling fan wire harness to J1 on the Power Supply PCB 5 Insert the cooling fan into the slots in the bottom case with the padded sides the top and bottom and the fan s harness to the handle side of the case 6 Complete procedure 6 5 6 9 Section 6 Disassembly Guide 6 10 6 10 DISPLAY PCB REMOVAL REPLACEMENT Removal WARNING The LCD panel contains toxic chemicals Do not ingest chemicals from a broken LCD panel 1 Complete the procedures in paragraphs 6 2 and 6 4 2 Disconnect the CCFL harness two white wires from J7 of the User Interface PCB See Figure 6 8 3 Use a small blade screwdriver to pry the clip from either edge of J5 then disconnect the Display PCB ribbon cable from the connector 4 Remove the sc
65. le Note This section is written using Nellcor factory set defaults If your institution has preconfigured custom defaults those values will be displayed Factory defaults can be restored Refer to paragraph 4 4 3 PARAM subparagraph RESET 3 3 1 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 e 3 Charge the battery for at least 14 hours in standby 3 1 Section 3 Performance Verification 3 3 2 Power Up Performance The power up performance tests 3 3 2 1 through 3 3 2 2 verify the following monitor functions 3 3 2 1 Power On Self Test 3 3 22 Power On Defaults and Alarm Limit Ranges POWER ON OFF ALARM SILENCE S ADJUST DOWN r POWERIBATTERY SOFTKEYS ADJUST CHARGING INDICATOR CONTRAST uP Figure 3 1 N 395 Controls 3 3 2 1 Power On Self Test 1 Connect the monitor to an AC power source and verify that the AC Power Battery Charging indicator is lit 2 Do not connect any input cables to the monitor 3 Observe the monitor front panel With the monitor off press the POWER ON OFF button Figure 3 1 The monitor must perform the following sequence a Within 2 seconds all LEDs are illuminated all pixels on the LCD display are illuminated and the backlight comes on b The indicators remain lighted The LCD
66. licable to the N 395 contact Nellcor s Technical Services Department CIRCUIT ANALYSIS The following paragraphs discuss the operation of each of the printed circuit boards within the N 395 pulse oximeter Refer to the appropriate schematic diagram at the end of this supplement as necessary FUNCTIONAL OVERVIEW AC INPUT The monitor functional block diagram is shown in Figure 11 2 Most of the functions of the N 395 are performed on the User Interface PCB Functions on the User Interface PCB include the MC 68331 microprocessor DSP and Memory Other key components of the N 395 are the Power Entry Module PEM Power Supply and the LCD Display The Display module includes the Membrane Panel and the LCD Display The Membrane panel contains annunciators and push buttons allowing the user to access information and to select various available parameters The LCD Display PCB contains the LCD that presents the patient data Power Supply MDB8E331 lee Syst m 258K EE PIC 16083 UIF PCB Frontend La Patam Dara part Figure 11 2 N 395 Functional Block Diagram A selector switch on the back of the N 395 allows the user to connect the monitor to AC power ranging from 100 VAC to 240 VAC The switch has two positions one for 100 VAC through 120 VAC and one for 210 VAC through 240 VAC Verify that the switch selection matches the AC power at your location before plugging the monitor into a
67. log saturation output 7 Normally Open N O Dry Contacts for Nurse Call N O with no audible alarm 8 Normally Closed N C Dry Contacts for Nurse Call N C with no audible alarm 9 RXD RS 422 negative input 10 Signal Ground isolated from earth ground 11 Nurse Call RS 232 level output 5 to 12 VDC with no audible alarm 5 to 12 VDC with audible alarm 12 TXD RS 422 negative output 13 AN_Pulse analog pulse rate output 14 AN_Pleth analog pleth wave output 15 Nurse Call Common for Dry Contacts Note When the instrument is turned off the contact at pin 7 becomes closed and the contact at pin 8 becomes open The pin layout is illustrated in Figure 10 3 An AMP connector is used to connect to the data port Use AMP connector AMP P N 747538 1 ferrule AMP P N 1 747579 2 and compatible pins AMP P N 66570 2 9 10 11 12 13 14 15 123 4 5 6 7 8 Figure 10 3 Data Port Pin Layout When building an RS 422 cable a resistor 120 Q 1 2 watt 5 must be added between pins 1 and 9 of the cable The end of the cable with the resistor added must be plugged into the N 395 This resistor is not necessary for RS 232 cables The data cable must be shielded example Beldon P N 9616 Connectors at both ends of the data cable must have the shield terminated to the full 360 degrees of the connector s metal shell If rough handling or sharp bends in the cable is anticipated use a braided shi
68. ms relating to nonfunctioning displays and audible tones or alarms and recommended actions If the action requires replacement of a PCB or module refer to Section 6 Disassembly Guide Table 5 4 Display Alarms Problems Symptoms Recommended Action 1 Display values are missing or erratic 2 Display pixels do not light 3 Alarm sounds for no apparent reason 4 Alarm does not sound If the sensor is connected replace the sensor extension cable If the condition persists replace the sensor If the condition still persists replace the interface printed circuit board Check the connection between the User Interface PCB and the Display PCB If the condition does not change replace the Display PCB If the condition still persists replace the User Interface PCB Moisture or spilled liquids can cause an alarm to sound Allow the monitor to dry thoroughly before using If the condition persists replace the User Interface PCB Check alarm silence status Replace the speaker as described in Section 6 Disassembly Guide If the condition persists replace the User Interface PCB 5 4 Section 5 Troubleshooting 5 7 4 Operational Performance Table 5 5 lists symptoms of problems relating to operational performance no error codes displayed and recommended actions If the action requires replacement of a PCB or mod
69. n Observe ESD electrostatic discharge precautions when disassembling and reassembling the N 395 and when handling any of the components of the N 395 3 Separate the top case from the bottom case of the monitor being careful not to stress the wire harnesses between the cases Place the two halves of the monitor on the table as shown in Figure 6 3 4 Disconnect the Power Supply harness from J6 on the User Interface PCB 6 3 Section 6 Disassembly Guide Figure 6 3 Separating Case Halves 6 5 MONITOR ASSEMBLY 1 Connect the Power Supply to J8 on the User Interface PCB 2 Place the top case over the bottom case being careful to align the Display PCB Power Entry Module and the fan with the slots in the case halves Caution When reassembling the N 395 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 3 Install the four corner screws 6 4 Section 6 Disassembly Guide 6 6 BATTERY REPLACEMENT Removal 1 Follow the procedure in paragraphs 6 2 and 6 4 2 Remove the two screws from the battery bracket and lift the battery out of the bottom case as shown in Figure 6 4 3 sure to note the polarity of the leads Use needle nose pliers to disconnect the leads from the battery Posilive i Negative Figure 6 4 N 395 Battery 4 The lead acid battery is recyclable Do not dispose of the batter
70. n AC outlet Section 11 Technical Supplement 11 8 11 8 1 11 8 2 AC power enters the N 395 through the PEM A 0 5 amp fuse is placed in both the Hot and Neutral lines These user accessible fuses are located in a fuse drawer which is part of the PEM on the back of the instrument POWER SUPPLY PCB Fan Control The N 395 uses an unregulated linear power supply This power supply provides the DC power needed to charge the battery run the cooling fan and to power User Interface Protection from Electro Static Discharge ESD and patient isolation from mains are also provided by the power supply AC power from the PEM is passed through a step down transformer T2 which has two primary and two secondary windings If switch SW1 on the back of the monitor is in the 120 VAC position the primary windings are in parallel The primary windings are in series if SW1 is in the 240 VAC position Each secondary winding is fused with a 0 5 amp 250 volt fuse F1 and F2 Ifa short circuit should occur in the DC circuitry these fuses prevent the transformer from overheating The output of the transformer varies depending on load and input Voltage measured between the outlet of a secondary winding and ground can be from 6 to 20 VAC High frequency noise from the AC line and from the User Interface PCB is filtered by C6 and C8 before passing through the bridge rectifier Two outputs from the bridge rectifier are used in the N 395 Th
71. n asterisk indicates values that produce an alarm Press the ALARM SILENCE button to silence the alarm 3 7 Section 3 Performance Verification 3 3 3 5 Nurse Call 3 3 3 6 Analog Output 3 8 1 Table 3 1 Dynamic Operating Range SRC 2 Settings N 395 Indications RATE LIGHT MODULATION SpO2 Pulse Rate 38 HIGH2 LOW 79 83 35 41 112 HIGHI HIGH 79 83 109 115 201 LOW LOW 79 83 198 2043 201 LOW HIGH 79 83 198 2043 Connect the negative lead of a voltmeter to pin 5 and positive lead to pin 11 of the data port on the back of the instrument Ensure that the audible alarm is not silenced or turned off 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 Figure 3 9 Data Port Pinouts Set the SRC 2 Rate switch to 201 to create an alarm condition Verify an output voltage at pins 5 and 11 between 5 to 12 VDC Press the ALARM SILENCE button With no active audible alarm the output voltage at pins 5 and 11 must be between 5 to 12 VDC This verifies the RS 232 Nurse Call function With the instrument in an alarm condition use a digital voltmeter DVM to verify that there is no continuity gt 1 MQ between pins 8 and 15 and that there is continuity lt 60 Q between pins 7 and 15 Adjust the alarm limits so that there is no alarm condition Use a DVM to verify that there is continuity between pins 8 and 15 and that there is not continuity between pins 7 and 15 This ve
72. ne one is for instrument type software revision level type of printout and alarm parameter settings The second line contains the column headings A trend point is recorded for every 4 seconds of instrument operation Up to 48 hours of instrument operation data can be recorded If the final line on the printout shows Output Complete then the data has been successfully transmitted with no corruption If there is no Output Complete line printed the data should be considered invalid N 395 Version 1 0 0 000 TIME Trend 01 01 Jul 99 14 00 00 01 Jul 99 14 00 05 01 Jul 99 14 00 10 01 Jul 99 14 00 15 SpO2 100 100 N 395 Version 1 0 0 000 TIME Trend 02 01 Jul 99 14 24 24 01 Jul 99 14 24 29 01 Jul 99 14 24 29 5002 79 79 0 N 395 Version 1 0 0 000 TIME Trend 03 11 Jul 99 7 13 02 11 Jul 99 7 13 07 11 Jul 99 7 13 12 11 Jul 99 7 13 17 11 Jul 99 7 13 22 11 Jul 99 7 13 27 11 Jul 99 7 13 32 Output Complete SpO2 99 99 99 99 99 99 99 Instrument PR bpm 120 120 Instrument PR bpm 58 57 0 Instrument PR bpm 132 132 132 132 132 132 132 Figure 4 7 Instat Printout SpO2 Limit 30 100 PA SpO2 Status SD PS 220 220 SpO2 Limit 80 100 PA SpO2 Status 220 PS SL PL 220 PS SLPL PSLPSLPL SpO2 Limit 80 100 PA SpO2 Status 220 PH 220 PH 220 PH 220 PH 220 PH 220 PH 220 PH PR Limit 100 180 bpm UIF Status Aud BULB AO L BULB AO BULB BULB PR Limit 60 180
73. ng several different types of displays Graphs which are used for trend screens can be displayed Real time patient data can include a plethysmographic waveform and digital values for SpO2 and BPM Ifa plethysmograph is not desired the operator can select to view only digital data for SpO2 and BPM along with a blip bar to show pulse intensity 11 11 2 Membrane Keypad A membrane keypad is mounted as part of the top case A ribbon cable from the keypad passes through the top case and connects to the User Interface PCB Nine keys allow the operator to access different functions of the N 395 These keys allow the user to select and adjust the alarm limits cycle power to the unit and to silence the alarm Alarm volume and alarm silence duration can also be adjusted via the keypad Pressing the softkeys can access a number of other functions These functions are discussed in greater detail in Section 4 Five LEDs are also part of the membrane keypad These LEDs indicate AC power available low battery pulse search alarm silence and noise motion 11 8 Section 11 Technical Supplement 11 12 SCHEMATIC DIAGRAMS The following schematics are included in this section Figure 11 3 Figure 11 4 Figure 11 5 Figure 11 6 Figure 11 7 Figure 11 8 Figure 11 9 Figure 11 10 Figure 11 11 Figure 11 12 Figure 11 13 Figure 11 14 Figure 11 15 Figure 11 16 Linear Power Supply Schematic 404 Analog Front End Schematic 404 Analog Fr
74. nt shuts off At this during DC point if possible cease use of the N 395 on battery operation and an power connect it to an AC source and allow it to alarm is recharge approximately 14 hours The N 395 may sounding continue to be used while it is recharging A full recharge of the battery while the monitor is being used takes 18 hours 4 Battery does not 1 Replace battery if it is more than 2 years old charge 2 If the battery fails to hold a charge replace the battery as indicated in Section 6 Disassembly Guide 3 Open the monitor as described in Section 6 Verify the power supply s output to the battery while on AC by disconnecting the battery leads from the power supply and connect a DVM to them The voltage measured should be 6 8 VDC 0 15 VDC and the current should be 400 mA 80 mA Replace the power supply if above values are not met 5 3 Section 5 Troubleshooting 5 7 2 Buttons Table 5 3 lists symptoms of problems relating to non responsive buttons and recommended actions If the action requires replacement of a PCB refer to Section 6 Disassembly Guide Table 5 3 Button Problems Symptoms Recommended Action does not respond to some or all of the buttons 1 The N 395 turns on but 1 Replace Top Case assembly 2 If the buttons still do not work replace interface PCB 5 7 3 Display Alarms Table 5 4 lists symptoms of proble
75. on default values 4 3 FACTORY DEFAULT SETTINGS Factory power on default settings for the N 395 are listed in Table 9 1 on page 9 2and Table 9 2 on page 9 3 4 4 SERVICE FUNCTIONS Service functions can be used to select institutional defaults and to access information about the patient or instrument Only a Nellcor Customer Service Engineer should access some of the items available through the service functions These items will be noted in the text that follows 4 4 1 Accessing the Service Functions Disconnect the sensor from the SCP 10 or MC 10 extension cable or disconnect the SCP 10 or MC 10 extension cable from the instrument Simultaneously press the LIGHT softkey and the CONTRAST button for more than 3 seconds The service function is only accessible from the main menu display The menu bar will change to the headings listed in Figure 4 1 Note If the above steps are performed with a sensor cable connected only the PARAM and EXIT softkeys appear on the screen 4 1 Section 4 Power On Settings and Service Functions 4 4 2 4 4 3 she NEN Figure 4 1 Service Function Softkeys Figure 4 2 can be used as a quick reference showing how to reach different softkey functions Each gray box represents a different set of softkeys that can be reached with the service function Items reached through the PARAM softkey can be accessed during normal operation Functions provided by the PRINT and NEXT softke
76. on the internal battery power When the CPU sends a tone request three items are used to determine the tone that is sent to the speaker First pulse tones change with the SpO2 value being measured The pulse beep tone will rise and fall with the measured SpO2 value Second three levels of alarms each with its own tone can occur High Medium and Low priority Third the volume of the pulse tone and alarm is user adjustable Alarm volume can be adjusted from level 1 to level 10 with level 10 being the highest volume Pulse tones can be turned off by setting the volume to zero A real time clock is provided by the N 395 This is provided by a dedicated real time clock chip User s interface includes the front panel display and the keypad By pressing any of nine keys on the keypad the operator can access different functions of the N 395 The 331 will recognize the keystroke and make the appropriate change to the monitor display to be viewed by the operator The monitor uses any changes made by the operator until it is turned off Default values will be restored when the unit is powered on again Patient data is stored by the N 395 and can be downloaded to a printer through the data port provided on the back of the monitor An in depth discussion of the data port is covered in Section 10 of this manual Section 11 Technical Supplement DSP Digital Signal Processor The DSP controls the SpO2 function and communicates the data to the 3
77. ont End and Pre Amp Schematic 404 Analog and Digital Schematic 404 DSP Core and Communication Schematic 404 Front End to 331 Core Communication Schematic 404 Front End Power Supplies Schematic SIP SOP Interface Schematic SIP SOP Interface Schematic MC331 CPU Core Schematic MC331 Memory Schematic Contrast and Sound Schematic Power Supply Schematic Display Interface and Drivers Schematic Blank Page W2 21 uA line earth leakage for each 220 pF cap LINE_IN 18GA BRN wi 18GA _GRN YEL 7 wa NEUTRAL 18GA BLU 490 TH i EPS2PC3 TH NEUT_IN Power Entry MAIN_DC ESD Protection HIGH CURRENT VIAS no 111 DC 95 MPSA56 N Fan Control e iod rS CR5 15000U 1 00K 1 22V bo SMCJ22C TH TH X CTRL SMCJ22C CRI 1N4702 15V TH Main Board 1 BATT CHK O w7 22GA_WHT Note All resistors 1 8W 1206 unless otherwise noted Battery Charge CTRL LM385S Q3 MPSA56 02 CR6 IRF9510 TH 2N7002S 2 CR7 1 h 3 F CR4 Mts MBRS330T3 CHG_OUT Sw2 MTS50B TH MAIN_DC O wo 22GA_RED BATT OUT O we 22GA_ORN ws 22GA_BLK F3 N gt BATT O w4 AN
78. own sequence can be repeated by turning the unit back on provided the battery voltage remains above the critical level Battery voltage is considered critical when it decreases to 5 67 0 1 VDC If the instrument is turned on and battery voltage is at the critical level an error code is displayed and the instrument will not monitor the patient The instrument will run for 15 minutes with the error code displayed and then power down Both conditions can be corrected by plugging the unit into an AC source for 14 hours to allow the battery to fully recharge 11 10 USER INTERFACE PCB 11 10 1 The User Interface PCB is the heart of the N 395 All functions except the unregulated DC power supply LCD display and membrane keypad reside on the User Interface PCB Regulated DC Power Supply The User Interface PCB receives the MAIN DC unregulated voltage of 7 to 18 VDC from the Power Supply or 5 8 to 6 5 VDC from the internal battery From either of these signals the regulated power supply on the User Interface PCB generates 5 0 VDC Section 11 Technical Supplement 11 10 2 Controlling Hardware 11 6 Two microprocessors reside on the User Interface PCB The CPU is a Motorola MC68331CF 331 The second microprocessor TMS320C32 is referred to as the DSP and is controlled by the CPU CPU Central Processing Unit The 331 is the main controller of the N 395 The 331 controls the front panel display data storage instrument status
79. oxyhemoglobin in arterial blood SpO2 is the ratio of corrected absorption at each wavelength 11 2 1 Functional Versus Fractional Saturation Like any two wavelength pulse oximeter the N 395 cannot recognize the presence of significant levels of dyshemoglobins In the presence of significant amounts of methemoglobin such oximeters become inaccurate clinicians are trained to evaluate the possible presence of methemoglobin by other means In the presence of carboxyhemoglobin two wavelength pulse oximeters do approximately indicate functional saturation Unlike pulse oximeters some instruments such as CO Oximeters measure fractional saturation that is oxygenated hemoglobin expressed as a percentage of all measured hemoglobin including dyshemoglobins Section 11 Technical Supplement Consequently before comparing N 395 measurements with those obtained by an instrument that measures fractional saturation measurements must be converted as follows fractional saturation functional saturation PE x 100 100 96 carboxyhemoglobin methemoglobin 11 2 2 Measured Versus Calculated Saturation When saturation is calculated from a blood gas measurement of the partial pressure of arterial oxygen PO2 the calculated value may differ from the N 395 5002 measurement This is because the calculated saturation may not have been corrected for the effects of variables that can shift the relationship between 2 and satura
80. parameters have violated the default alarm limits Press and hold the ALARM SILENCE button on the front of the monitor for less than 3 seconds Verify that the SpO2 display indicates 60 and the Pulse display indicates SEC while the ALARM SILENCE button is pressed When the button is released the alarm is silenced With the alarm silenced verify the following a The alarm remains silenced for 60 seconds b The Alarm Silence indicator lights c The SpO2 and Pulse displays continue to flash d pulse tone is still audible e The audible alarm returns in approximately 60 seconds Press and hold the ALARM SILENCE button Within 3 seconds press the DOWN ARROW button until the Pulse Rate display indicates 30 Press the UP ARROW button and verify that the displays indicate 60 SEC 90 SEC 120 SEC and OFF Release the button when the display indicates OFF Press and release the ALARM SILENCE button Verify that the Alarm Silence Indicator flashes 9 Section 3 Performance Verification Wait approximately 3 minutes Verify that the alarm does not return After 3 minutes the alarm silence reminder beeps three times and will continue to do so at approximately 3 minute intervals 3 3 3 2 Alarm Volume Control After completing the procedure in paragraph 3 3 3 1 1 4 Press and hold the ALARM SILENCE button and verify the following a OFF is displayed for approximately 3 seconds b After 3 seconds a s
81. processor is in proper control of LED intensity 10 Turn the N 395 otff 3 3 4 2 Operation with a Live Subject 3 4 Patient monitoring involves connecting the monitor to a live subject for a qualitative test 1 Ensure that the monitor is connected to an AC power source 2 Connect an SCP 10 or MC 10 sensor input cable to the monitor 3 Connect a Nellcor Durasensor oxygen transducer model DS 100A to the sensor input cable 4 Clip the DS 100A to the subject as recommended in the sensor s directions for use 5 Press the POWER ON OFF button to turn the monitor on and verify that the monitor is operating 6 The monitor should stabilize on the subject s physiological signal in about 15 to 30 seconds Verify that the oxygen saturation and pulse rate values are reasonable for the subject SAFETY TESTS N 395 safety tests meet the standards of and are performed in accordance with IEC 601 1 EN 60601 1 Amendment 1 Amendment 2 and UL 2601 1 for instruments classified as Class 1 and TYPE BF and ANSI AAMI Standard ESI Applicable tests for these standards are listed below The technician must be familiar with the Standards applicable to their institution and country Test equipment and its application must comply with the applicable standard e Ground Integrity e Earth Leakage Current e Enclosure Leakage Current e Patient Applied Risk Current e Patient Isolation Risk Current Note Patient Applied Risk Current and P
82. pt has been made to set the alarm silence duration power on default to OFF The power on default cannot be set to OFF INVALID SpO2 LIMIT An attempt has been made to set either the upper or lower alarm limit power on default below 80 The power on default cannot be set below 80 5 7 Section 5 Troubleshooting 5 8 READING TRENDS The monitor is gathering trend information for display SENSOR DISCONNECTED The sensor has disconnected from the cable the cable has disconnected from the monitor or the sensor cable wiring is defective Press the ALARM SILENCE button to silence the alarm Check the connections If this does not correct the problem replace the sensor and or cable SENSOR OFF The sensor has become disconnected from the patient Press the ALARM SILENCE button to silence the alarm Check the sensor to patient connection If this does not correct the problem replace the sensor SECTION 6 DISASSEMBLY GUIDE 6 1 Introduction 6 2 Prior to Disassembly 6 3 Fuse Replacement 6 4 Monitor Disassembly 6 5 Monitor Assembly 6 6 Battery Replacement 6 7 Power Entry Module Removal Replacement 6 8 Power Supply Removal Replacement 6 9 Cooling Fan Removal Replacement 6 10 Display PCB Removal Replacement 6 11 User Interface PCB Removal Replacement 6 12 Alarm Speaker Removal Replacement 6 1 INTRODUCTION The N 395 can be disassembled down to all major component parts including PCBs battery cables
83. r Supply Schematic 11 9 lil Table of Contents LIST OF TABLES Figure 11 4 404 Analog Front End 11 9 Figure 11 5 404 Analog Front End and Pre Amp Schematic 11 9 Figure 11 6 404 Analog and Digital 11 9 Figure 11 7 404 DSP Core and Communication Schematic 11 9 Figure 11 8 404 Front End to 331 Core Communication Schematic 11 9 Figure 11 9 404 Front End Power Supplies 11 9 Figure 11 10 SIP SOP Interface 11 9 Figure 11 11 SIP SOP Interface Schematic 11 9 Figure 11 12 MC331 CPU Core 11 9 Figure 11 13 MC331 Memory Schematic 11 9 Figure 11 14 Contrast and Sound Schematic 11 9 Figure 11 15 Power Supply Schematltic 11 9 Figure 11 16 Display Interface and Drivers 11 9 Table 3 1 Dynamic Operating 3 8 Tabl
84. remote location will be signaled anytime there is an audible alarm If the audible alarm has been set to Off or silenced the Nurse Call function is also turned off Pin 11 on the data port is the RS 232 Nurse Call signal and in 5 is ground see Table 10 1 When there is no audible alarm the voltage between pins 10 and 11 will be 5 VDC to 12 VDC or 5V DC to 12 VDC depending on the option chosen via the softkeys either NCALL or NCALL Whenever there is in an audible alarm the output between pins 5 and 11 will reverse polarity An internal Nurse Call relay pins 7 8 and 15 provides dry contacts that can be used to signal a remote alarm Pin 15 is common pin 7 is normally open N O and pin 8 is normally closed N C Table 10 3 shows the state of the contacts for alarm and no alarm conditions and for instrument off Table 10 4 defines the ratings of the Nurse Call relay Table 10 3 Nurse Call Relay Pin States Pin No Alarm or Audible Instrument Off Alarm Alarm Silenced 7 N O Open Closed Closed 8 N C Closed Open Open Section 10 Data Port Interface Protocol Table 10 4 Rating of Nurse Call Relay Maximum Input 30 V AC or DC polarity is not important Voltage Load Current 120 mA continuous peak 300 mA 100 ms 26 5 2 to 50 5 Q 40 5 Q typical during alarms Minimum Resistance Ground Reference Isolated Ground Electrical Isolation 1500 Volts
85. rew holding the clamp to the ferrite on the ribbon cable of the Display PCB 5 Separate the adhesive connection of the double sided tape and lift the Display PCB up to remove it from the top case 6 Remove the used double sided tape CCFLHarmess _ Figure 6 8 Display PCB Section 6 Disassembly Guide Replacement 7 Install new double sided tape as shown in Figure 6 8 8 Slide the Display PCB into the grooves in the top case Check to make sure the Display PCB is firmly seated in the top case Apply pressure between the top case and the display PCB to make good contact with the double sided tape 9 Connect the wire harness with two white wires to J7 of the User Interface PCB 10 Connect the Display PCB ribbon cable to J5 of the User Interface PCB Install the clip over the 15 connector 11 Secure the ferrite on the ribbon cable from the Display PCB Place the clamp over the ferrite assure that no wires are pinched and screw the clamp to the User Interface PCB 12 Complete the procedure in paragraph 6 5 6 11 USER INTERFACE PCB REMOVAL REPLACEMENT Removal 1 2 Complete the procedures in paragraphs 6 2 and 6 4 Disconnect the CCFL harness two white wires from J7 of the User Interface PCB See Figure 6 8 Use a small blade screwdriver to pry the clip from either edge of J5 then disconnect the Display PCB ribbon cable from the connector Remove the screw holding the clamp to the ferrite on the ribbon
86. rification number CRC XXXX Neither of these numbers should change during normal operation The numbers will change if the monitor is serviced and receives a software upgrade Alarm Limits N 395 VERSION 1 0 0 1 CRC XXXX SpO2 Limit 30 100 PR Limit 100 180 bpm TIME SpO2 BPM Status The last data field in the top line indicates the high and the low alarm limits for SpO2 and for the pulse rate PR In the example above the low alarm limit for SpO2 is 30 and the high alarm limit is 100 Pulse Rate alarm limits are 100 bpm low and 180 bpm high Column Headings N 395 VERSION 1 0 0 1 CRC XXXX SpO2Limit 30 100 PR Limit 100 180 bpm Actual column headings are in the second row of the Column Heading Patient data presented in the chart from left to right is the time that the line was obtained the current SpO2 value being measured the current Pulse Rate in beats per minute bpm the current Pulse Amplitude PA and the operating status of the N 395 10 6 2 Patient Data and Operating Status Time TIME 5002 BPM PA Status 01 Jul 97 14 00 00 100 120 220 The Time column represents the N 395 real time clock Patient Data N 395 VERSION 1 0 0 1 CRC XXXX SpO2 Limit 30 100 PR Limit 100 180 bpm TIME 01 Jul 97 14 00 06 Patient data and the operating status of the unit are highlighted in the display above Parameter values at the time of the printout are displayed directly beneath the heading for each param
87. rifies the solid state Nurse Call function Connect the negative lead of a voltmeter to pin 10 and positive lead to pin 6 of the data port on the back of the instrument Figure 10 3 Press the following softkeys SETUP NEXT NEXT and ANALOG Press the 1 VOLT softkey Verify that the output voltage is 1 0 0 025 VDC This verifies the analog SpO2 function Leave the negative lead connected to pin 10 and verify 1 0 0 025 VDC on pins 13 and 14 This verifies the BPM and Pleth function Note If step 4 takes more than 2 minutes to complete the analog output will time 5 out Repeat step 2 to initiate the analog output Move the positive lead back to pin 6 Section 3 Performance Verification Press the following softkeys SETUP NEXT NEXT and ANALOG Press the 0 VOLT softkey Verify that the output voltage is 0 0 0 025 VDC Leave the negative lead connected to pin 10 and verify 0 0 0 025 VDC on pins 13 and 14 Note If step 8 takes more than 2 minutes to complete the analog output will time 9 out Repeat step 2 to initiate the analog output Disconnect the voltmeter from the instrument 3 3 3 7 Operation on Battery Power 1 2 With the instrument operating on AC turn on the backlight Disconnect the instrument from AC and verify that the AC Battery Charging indicator turns off Verify that the instrument continues monitoring normally and that the low battery indicator is not lit Note If
88. ructions in paragraph 10 2 2 If the condition still persists replace the User Interface PCB 2 The RS 232 nurse callis 1 Verify that connections are made between not working pins 5 GND and 11 nurse call of the data port See Figure 10 3 2 Verify that the output voltage between ground pin 5 and pin 11 is 5 to 12 VDC no alarm and 5 to 12 VDC during alarm See Figure 10 2 3 If the condition still persists replace the User Interface PCB 5 8 ERROR CODES An error code is displayed when the N 395 detects a non correctable failure When this occurs the unit stops monitoring sounds a low priority alarm that cannot be silenced clears patient data from the display and displays an error code Table 5 7 provides a complete list of error codes and possible solutions Table 5 7 Error Codes Code Meaning Possible Solutions 1 Failure of Power On Self Test Replace User Interface PCB POST 4 Battery dead Charge battery for 14 hours Leads of battery reversed see paragraph 6 6 Replace battery 5 Too many microprocessor resets 1 Cycle power within a period of time Replace User Interface PCB if code 5 repeatedly occurs Replace Power Supply 6 Cycle power Replace User Interface PCB 8 Boot CRC Error Cycle power 11 Flash ROM corruption Replace User Interface PCB if 12 Excessive resets code repeatedly occurs 5 6 5 8 1 Section 5
89. s 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 paragraph 3 3 1 After approximately 10 minutes the battery should have enough charge to allow the unit to operate on AC 2 1 Blank Page SECTION 3 PERFORMANCE VERIFICATION 3 1 Introduction 3 2 Equipment Needed 3 8 Performance Tests 3 4 Safety Tests 3 1 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 395 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 395 fails to perform as specified in any test repairs must be made to correct the problem before the monitor is returned to the user 3 2 EQUIPMENT NEEDED Equipment Description Digital multimeter DMM Fluke Model 87 or equivalent Durasensor oxygen transducer DS 100A Oxisensor II oxygen transducer D 25 Pulse oximeter tester SRC 2 Safety analyzer Must meet current AAMI ES1 1993 amp IEC 601 1 1998 specifications Sensor extension cable SCP 10 or MC 10 Data interface cable EIA 232 cable optional Stopwatch Manual or electronic 3 3 PERFORMANCE TESTS The battery charge procedure should be performed before monitor repairs whenever possib
90. sound generation and monitors and controls the instrument s power The 331 also controls data port communication and the Nurse Call feature Battery voltage is checked periodically by the processor A signal from the processor turns the charging circuit off to allow this measurement to be taken If the processor determines that the battery voltage is below 5 85 0 1 VDC the CPU declares a low battery alarm If battery voltage on the User Interface PCB is measured below 5 67 0 1 DCV the monitor will display an error code and sound an audible alarm Voltages measured at the battery will be slightly higher than the values listed above The user will be unable to begin monitoring a patient if the battery voltage remains below this point If either event occurs plug the unit into an AC source for 14 hours to allow the battery to fully recharge When the N 395 is powered by AC or on battery power the RS 232 Nurse Call function is available If no audible alarm conditions exist the output will be 5 to 12 VDC or 5 VDC to 12 VDC These voltages are dependent upon the option selected by the use of the softkeys Should an audible alarm occur the output will change polarity The 331 also controls a set of dry contacts provided by a pair of solid state relays on the User Interface PCB These solid state relays provide the Nurse Call signals available at the data port pins 7 and 15 and pins 8 and 15 The relay will function normally on AC power or
91. te After 10 seconds with no activity normal display is resumed 2 Press the LIMITS softkey Press and hold the DOWN ARROW button Verify that the boxed number for SpO2 upper alarm limit reduces to a minimum of 85 See Figure 3 5 Note A decimal point in the display indicates that the alarm limits have been changed from factory default values 3 Pressthe SELECT softkey Verify that the monitor emits a single beep and the box moves to the SpO2 lower alarm limit of 85 3 3 Section 3 Performance Verification 10 3 4 Figure 3 5 Adjusting SpO2 Lower Alarm Limit Press and hold the DOWN ARROW button and verify that the SpO2 lower alarm limit display reduces to a minimum of 20 Press and hold the UP ARROW button and verify that the SpO2 lower alarm limit display cannot be raised past the upper alarm limit setting of 85 Press the EXIT softkey Press the LIMITS softkey and then press the SELECT softkey three times Verify that the monitor emits a beep after each keystroke The Pulse upper alarm limit should be 170 and should be boxed See Figure 3 6 Figure 3 6 Adjusting High Pulse Rate Alarm Press and hold the DOWN ARROW button Verify that the minimum displayed value is 40 for the Pulse upper alarm limit Press the EXIT softkey Press the LIMITS softkey and then press the SELECT softkey four times Verify that the Pulse lower alarm limit display indicates an alarm limit of 40 and is boxed See Figur
92. teady tone is heard at the default alarm volume setting the SpO2 display indicates VOL and the Pulse Rate display indicates the default setting of 5 While still pressing the ALARM SILENCE button press the DOWN ARROW button until an alarm volume setting of 1 is displayed Verify that the volume of the alarm has decreased but is still audible Continue pressing the ALARM SILENCE button and press the UP ARROW button to increase the alarm volume setting to a maximum value of 10 Verify that the volume increases Press the DOWN ARROW button until a comfortable audio level is attained Release the ALARM SILENCE button The tone will stop 3 3 3 3 Pulse Tone Volume Control 1 Press the UP ARROW button and verify that sound level of the beeping pulse tone increases Press the DOWN ARROW button and verify that sound level of the beeping pulse tone decreases until it is no longer audible Press the UP ARROW button to return the beep volume to a comfortable level 3 3 3 4 Dynamic Operating Range The following test sequence verifies proper monitor operation over a range of input signals 1 Connect the SRC 2 to either the SCP 10 or MC 10 sensor cable which is connected to the N 395 and turn the N 395 on 2 Place the SRC 2 in the RCAL 63 LOCAL mode 3 Set the SRC 2 as indicated in Table 3 1 Verify that the N 395 readings are within the indicated tolerances Allow the monitor several seconds to stabilize the readings Note A
93. the current settings in memory The instrument sounds three tones indicating that the changes have been saved as power on default values The new saved values will continue to be used through power on and off cycles until they are changed and saved again or until they are reset If NO is pressed the changed values will not be saved Note An invalid tone indicates a parameter value cannot be saved as a power on default see paragraph 4 2 Along with the invalid tone a message will be displayed indicating which parameter could not be saved as a power on default 4 4 4 PRINT PRINT Accessing the PRINT softkey makes four printouts available See Section 10 for information about how to make connections to the data port and how data is presented in a printout The appropriate printout can be selected by pressing the corresponding softkey Figure 4 4 represents the softkey configuration after the PRINT softkey has been selected Up to 48 hours of trend data can be viewed on the printouts described below When the instrument is turned on trend data is recorded every 4 seconds As an example an instrument that is used 6 hours a week would take approximately 8 weeks to fill its memory Note The two letter codes and the symbols that occur in the printout are described in Table 10 2 of Section 10 on page 10 11 4 3 Section 4 Power On Settings and Service Functions 4 4 Rigs Figure 4 4 PRINT Softkeys TREND A Trend printout will
94. the low battery indicator is illuminated perform the procedure outlined in 4 step 3 3 1 Connect the instrument to AC and verify that the AC Battery Charging indicator turns on and that the instrument is monitoring normally 3 3 4 General Operation The following tests are an overall performance check of the system 3 3 4 1 LED Excitation Test 3 3 4 2 Operation with a Live Subject 3 3 4 1 LED Excitation Test This procedure uses normal system components to test circuit operation A Nellcor Oxisensor II oxygen transducer model D 25 is used to examine LED intensity control The red LED is used to verify intensity modulation caused by the LED intensity control circuit 1 Nw PS p Connect the monitor to an AC power source Connect an SCP 10 or MC 10 sensor input cable to the monitor Connect a D 25 sensor to the sensor input cable Press the POWER ON OFF button to turn the monitor on Leave the sensor open with the LEDs and photodetector visible After the monitor completes its normal power up sequence verify that the sensor LED is brightly lit Slowly move the sensor LED in proximity to the photodetector element of the sensor Verify as the LED approaches the optical sensor that the LED intensity decreases Open the sensor and notice that the LED intensity increases 3 9 Section 3 Performance Verification 9 Repeat step 7 and the intensity will again decrease This variation is an indication that the micro
95. tic Diagrams 11 1 INTRODUCTION This Technical Supplement provides the reader with a discussion of oximetry principles and a more in depth discussion of N 395 circuits Block and schematic diagrams support a functional overview and detailed circuit analysis The schematic diagrams are located at the end of this section 11 2 OXIMETRY OVERVIEW The N 395 is based on the principles of spectrophotometry and optical plethysmography Optical plethysmography uses light absorption technology to reproduce waveforms produced by pulsatile blood The changes that occur in the absorption of light due to vascular bed changes are reproduced by the pulse oximeter as plethysmographic waveforms Spectrophotometry uses various wavelengths of light to measure light absorption through given substances Many times each second the N 395 passes red and infrared light into the sensor site and determines absorption Light transmission is affected by blood in the arteries capillaries and veins and by solid tissue The variation of absorption during the cardiac cycle is caused primarily by pulsatile changes in the amount of arterial blood in the tissue By tracking red and infrared absorption during the whole cardiac cycle the N 395 determines the portion of light absorption which is caused by the pulsating arterial blood Because oxyhemoglobin and deoxyhemoglobin differ in red and infrared absorption this corrected measurement can be used to determine the percent of
96. tion Figure 11 1 illustrates the effect that variations in pH temperature partial pressure of carbon dioxide PCO2 and concentrations of 2 3 DPG and fetal hemoglobin may have on the oxyhemoglobin dissociation curve 100 PH Temperatura cM PEO p E i 234DBG ee nx Fetal Hb lias Pa u at pH Temperature i PCO a t P m a r f i Li r Mr 4 op a 50 100 POs mmHg Figure 11 1 Oxyhemoglobin Dissociation Curve 11 3 SATSECONDS ALARM MANAGEMENT The N 395 utilizes Nellcor SatSeconds alarm management technique SatSeconds is a function of the software within the N 395 With the SatSeconds technique upper and lower alarm limits are set in the same way as traditional alarm management The clinician also sets a SatSeconds limit that allows monitoring of SpO2 below the selected low alarm limit for a period of time before an audible alarm sounds Refer to the N 395 Operator s manual for managing SatSeconds 11 4 11 5 11 6 11 7 Section 11 Technical Supplement READS THROUGH MOTION The N 395 takes advantage of increased microprocessing power with advanced mathematical algorithms Oxismart XL advanced signal processing allows the N 395 to read through challenging motion conditions to deliver accurate saturation and pulse rate values For a definition of motion as app
97. tor contact your supplier or local Nellcor office Technical Services Department for a returned goods authorization number Mark the shipping carton and any shipping documents with the returned goods authorization RGA number Return the N 395 by any method that provides proof of delivery 8 1 Section 8 Packing for Shipment 8 3 REPACKING IN ORIGINAL CARTON If available use the original carton and packing materials See Figure 8 1 Pack the monitor as follows 1 Place the monitor and if necessary accessory items in original packaging Figure 8 1 Repacking the N 395 2 Place in shipping carton and seal carton with packing tape 3 Label carton with shipping address return address and RGA number if applicable 8 2 Section 8 Packing for Shipment 8 4 REPACKING IN A DIFFERENT CARTON If the original carton is not available use the following procedure to pack the N 395 Figure 8 1 1 2 Place the monitor in a plastic bag Locate a corrugated cardboard shipping carton with a busting strength of at least 200 pounds per square inch psi Fill the bottom of the carton with at least 2 inches of packing material Place the bagged unit on the layer of packing material and fill the box completely with packing material Seal the carton with packing tape Label the carton with the shipping address return address and RGA number if applicable 8 3 Blank Page SECTION 9 SPECIFICATIONS 9 1 9
98. ule refer to Section 6 Disassembly Guide Table 5 5 Operational Performance Problems Symptoms Recommended Action 1 The Pulse Amplitude 1 The sensor may be damaged replace it indicator seems to indicate a pulse but the digital displays show 2 If the condition still persists replace the User Interface PCB zeroes 2 SpO2 or Pulse values 1 The sensor may be damp or may have been change rapidly Pulse reused too many times Replace it 7 indicator Is 2 An electrosurgical unit ESU may be interfering with performance Move the N 395 and its cables and sensors as far from the ESU as possible Plug the N 395 power supply and the ESU into different AC circuits Move the ESU ground pad as close to the surgical site as possible and as far away from the sensor as possible 3 Verify the performance with the procedures detailed in Section 3 4 If the condition still persists replace the User Interface PCB 5 5 Section 5 Troubleshooting 5 7 5 Data Port Table 5 6 lists symptoms of problems relating to the data port and recommended actions If the action requires replacement of the User Interface PCB refer to Section 6 Disassembly Guide Table 5 6 Data Port Problems Symptoms Recommended Action 1 No printout is being 1 The monitor s baud rate does not match the received printer Change the baud rate of the monitor following inst
99. ure 6 5 Power Entry Module 6 6 Figure 6 6 Power Supply u u bee ire thet rper tds 6 7 Figure 6 7 Cooling Fat uu tet et cee 6 9 Figure 6 8 Display 6 10 Figure 6 9 User Interface PCB r 6 12 Figure 6 10 Alarm 508 8 lt 6 13 Figure 7 1 N 395 Expanded 8 7 2 Figure 8 1 Repacking the 1 395 8 2 Figure 10 1 Data Port Softkeys 4 10 1 Figure 10 2 SpaceLabs Connection see 10 9 Figure 10 3 Data Pin Layout 10 6 Figure 10 4 Real Time Printout et 10 9 Figure 10 5 Trend Data Printout ASCII 10 11 Figure 10 6 Trend Data Printout GRAPH 10 12 Figure 11 1 Oxyhemoglobin Dissociation 11 2 Figure 11 2 N 395 Functional Block Diagram 11 3 Figure 11 3 Linear Powe
100. utput Complete statement is not printed at the end of the printout the data must be considered invalid ERRLOG Nellcor Customer Service Engineer Only A list of all the errors recorded in memory can be obtained by pressing the ERRLOG softkey The first line lists the type of instrument producing the printout software level type of printout and the time of the printout are listed in the first line The second line of the printout consists of column headings If nothing prints out there have been no errors An example of an Errlog printout is shown in Figure 4 6 N 395 Version 1 0 0 000 Op Time 10713 21 03 00634 26 01 Output Complete Error Log Figure 4 6 Time Addr Count 48F9 100 31A2 3 INSTAT Nellcor Customer Service Engineer Only Errlog Printout Section 4 Power On Settings and Service Functions 14600 00 07 The DELETE softkey described in the operator s manual allows the user to delete the most recent trend data The current trend data along with the deleted trends can be retrieved from the instrument through an Instat printout The oldest deleted trend is Trend 01 on the Instat printout If a Trend 01 already exists in memory from an earlier Delete the next deleted trend will become Trend 02 Every time a DELETE is performed from the user softkeys the number of existing trends will increase by 1 The current trend will have the largest trend number Figure 4 7 illustrates an Instat printout Li
101. y by placing it in the regular trash Dispose of the battery in accordance with local guidelines or return it to Nellcor Technical Services for disposal Replacement 5 Connect the leads to the battery The red wire connects to the positive terminal and the black wire connects to the negative terminal 6 Insert the new battery into the bottom case with the negative terminal towards the outside of the monitor Install the bracket and grounding lead with the two screws 7 Complete the procedure in paragraph 6 5 8 Turn the monitor on and verify proper operation 6 5 Section 6 Disassembly Guide 6 7 POWER ENTRY MODULE PEM REMOVAL REPLACEMENT Removal 1 Follow the procedure in paragraphs 6 2 and 6 4 2 Push the top of the Power Entry Module PEM in from the outside of the case and lift up 3 Use needle nose pliers to disconnect the leads from the PEM see Figure 6 5 G N and L are labels on the PEM Figure 6 5 Power Entry Module Replacement 4 Reconnect the three power supply leads as indicated in Table 6 1 5 Install the PEM in the bottom case with the fuse drawer facing down A tab in the bottom case holds the PEM in place Insert the bottom wing of the PEM between the tab and the internal edge of the sidewall of the bottom case Push the PEM down and towards the outside of the monitor until it clicks into place 6 Complete the procedure in paragraph 6 5 6 6 Section 6 Disassembly Guide 6 8 POWER SUPP
102. ys cannot be accessed when a sensor cable is connected to the instrument Each of the various functions is described in the text that follows PARAM PRINT NEXT EXIT TREND ERRLOG INSTAT INFO To User Softkeys RESET DEFAULTS DEFAULTS YES Figure 4 2 Service Function Softkey Map EXIT amp NEXT Softkeys PARAM NEXT There are not enough softkeys to display all of the options that are available at some levels of the menu Pressing the NEXT softkey allows you to view additional options available at a given menu level EXIT To back up one menu level press the EXIT softkey The service functions can be exited by repeatedly pressing the EXIT softkey When the PARAM softkey is pressed the function of the softkeys changes as shown in Figure 4 3 These options can be accessed without disconnecting the sensor cable from the instrument Section 4 Power On Settings and Service Functions Figure 4 3 PARAM Softkeys RESET The RESET softkey can be used if any settings stored in memory have been changed from factory default values If YES is pressed the instrument sounds three tones and the settings return to factory default values When NO is pressed no changes are made to the settings stored in memory SAVE When adjustable values are changed from factory default the SAVE softkey can be used to preserve the settings as institutional power on default values Pressing YES stores

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