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250cx Series Maternal/Fetal Monitor

Revision C

2036947-001

Equipment Overview: Theory of Operation

Summary of Contents for Corometrics 250cx Series

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Page 4: ...rics 250cx Series Monitor There are no user apparent differences among these software versions Due to continuing product innovation specifications in this manual are subject to change without notice NOTE For technical documentation purposes the abbreviation GE is used for the legal entity name GE Medical Systems Information Technologies GE Medical Systems Information Technologies will make availab...

Page 5: ...n For systems that include a number of different equipment that perform a number of functions one of each type of equipment shall be included in the evaluation The equipment listed below is representative of all possible combinations For individual equipment certification refer to the appropriate declarations of conformity Component Description 250cx Series Maternal Fetal Monitor Model 146 Fetal A...

Page 6: ...CE CE ii 0086 ...

Page 7: ...romagnetic Interference 1 9 Equipment Symbols 1 10 Service Requirements 1 11 Equipment ID 1 11 Intended Audience 1 12 Intended Use 1 12 Related Manuals 1 13 2 Equipment Overview 2 1 Equipment Description 2 3 Front Panel Description 2 4 Front Panel Displays 2 7 Display Example 2 8 Setup Screens 2 8 Softkeys 2 8 Mode Title Softkeys 2 8 Waveform Softkeys 2 9 Dedicated Softkey Area 2 9 Rear Panel Desc...

Page 8: ...rotocols 2 17 Theory of Operation 2 18 Systems Overview 2 18 3 Installation 3 1 Tools Required 3 3 Connections 3 3 Fetal Acoustic Stimulator 3 3 Remote Marks Connector 3 3 ECG Out Connector 3 3 J101 Connector Model 340 Telemetry System Interface 3 4 J109 J110 and J111 Connectors RS 232C 3 5 Power 3 6 J112 External Display Connector 3 7 Self Test Routine 3 7 Battery Backed RAM Status 3 8 Setup 3 9 ...

Page 9: ...UA Strain Gauge 4 8 Disposal of Product Waste 4 9 Patient Applied Parts 4 9 Packaging Material 4 10 Monitor 4 10 Electrical Safety Tests 4 10 Initial Conditions 4 10 AC Line 4 10 Ground Impedance 4 10 Chassis Leakage 4 11 Patient to Ground Leakage for MECG FECG 4 11 Patient to Line ISO Leakage for MECG FECG 4 11 Patient to Ground Leakage for IUP 4 12 Patient to Line ISO Leakage for IUP 4 12 Patien...

Page 10: ... Heart Rate Test Non Pattern 4 35 FECG US Modes 4 35 Dual Ultrasound Modes 4 36 Alarm Test 4 37 MSpO2 Test 4 39 NIBP Calibration and Testing 4 40 Purpose 4 40 Required Hardware 4 40 General Calibration Sequence 4 41 Calibration Verification 4 41 Calibrate Transducers 4 41 Overpressure Detection 4 42 System Leakage 4 42 Display Check 4 43 Checking a Display 4 43 Verifying the DSP Board Operation 4 ...

Page 11: ...CG UA Board Voltages 4 51 Recorder Photosensor Calibration 4 52 Adjusting the Paper Low Photosensor 4 52 Adjusting the Paper Out Photosensor 4 52 Adjusting the Paper Loading Sensor 4 53 Repair Log 4 54 Preventative Maintenance Inspection Report 4 55 Configuration 4 55 Tools Required 4 55 Visual Inspection 4 55 Comments 4 59 5 Troubleshooting 5 1 Diagnostic Tests 5 3 Main Motherboard and DSP Board ...

Page 12: ...oard 6 9 2025177 006 Main Power Supply 6 10 2025177 007 Dual Ultrasound Board 6 10 2025177 008 FECG UA Board 6 11 2025177 009 Isolated Power Supply Board 6 12 2025177 010 SpO2 Carrier Board with Nellcor MSpO2 Module 6 12 2025177 011 SpO2 Carrier Board with Masimo MSpO2 Module 6 13 2025177 012 SpO2 Carrier Board with TruSignal MSpO2 Module 6 13 2025177 013 Front end Motherboard 6 14 2025177 036 Cha...

Page 13: ... Strip Chart Recorder A 11 B Alarms Summary B 1 C Electromagnetic Compatibility C 1 Electromagnetic Compatibility EMC C 3 Guidance and Manufacturer s Declaration Electromagnetic Emissions C 3 Guidance and Manufacturer s Declaration Electromagnetic Immunity C 4 Recommended Separation Distances C 6 Compliant Cables and Accessories C 7 ...

Page 14: ...viii 250cx Series Maternal Fetal Monitor Revision C 2036947 001 ...

Page 15: ...ant if you have different manuals and you do not know which is the most current For the initial release all pages have the revision letter A For the second update all pages receive the revision letter B The latest letter of the alphabet added to the table below corresponds to the most current revision Revision Date Comment A 23 July 2007 Initial release B 26 July 2007 Change selected FRU nos Modif...

Page 16: ...1 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 For your notes ...

Page 17: ...parameters available in the 250cx Series of monitors It is the responsibility of each hospital to ensure that the Labor and Delivery staff is trained in all aspects of the selected model The 250cx Series Monitor is designed to assist the perinatal staff by providing information regarding the clinical status of the mother and fetus during labor The monitor does not replace observation and evaluatio...

Page 18: ...ANGER notice indicates an imminently hazardous situation which if not avoided will result in death or serious injury Warning A WARNING indicates a potentially hazardous situation which if not avoided could result in death or serious injury Caution A CAUTION indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury Cautions are also used to avoid damage...

Page 19: ...l personnel must avoid contact with the patient and monitor to avoid a dangerous shock hazard In addition proper placement of the paddles in relation to the electrodes is required to minimize harm to the patient DEFIBRILLATION PROTECTION When used with the GE Medical Systems Information Technologies recommended accessories the monitor is protected against the effects of defibrillator discharge If ...

Page 20: ...tient care The monitor does not replace observation and evaluation of the patient at regular intervals by a qualified care provider who will make diagnoses and decide on treatments and interventions INTERFACING OTHER EQUIPMENT Monitoring equipment must be interfaced with other types of medical equipment by qualified biomedical engineering personnel Be certain to consult manufacturers specification...

Page 21: ...n capability of the 250cx Series Monitor RF INTERFACE Known RF sources such as cell phones radio or TV stations and two way radios may cause unexpected or adverse operation of this device SIMULTANEOUS DEVICES Do not simultaneously connect more than one device that uses electrodes to detect ECG and or respiration to the same patient Use of more than one device in this manner may cause improper oper...

Page 22: ...g of each monitoring session follow the instructions in Chapter 5 Setup Procedures ENVIRONMENT The performance of the monitor has not been tested in certain areas such as x ray and imaging suites The monitor is not recommended for use in these environments EQUIPMENT CONFIGURATION The equipment or system should not be used adjacent to or stacked with other equipment If adjacent or stacked use is ne...

Page 23: ...ctromagnetic Immunity information in this product s service manual for EN 60601 1 2 2001 Edition 2 compliance information and safety information for this product This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with these instructions may cause harmful interference with other devices in the vicinity Disruption or interference may be e...

Page 24: ...PMENT Type BF equipment is suitable for intentional external and internal application to the patient excluding direct cardiac application Type BF equipment has an F type applied part DEFIBRILLATOR PROOF TYPE BF EQUIPMENT Type BF equipment is suitable for intentional external and internal application to the patient excluding direct cardiac application Type BF equipment is type B equipment with an F...

Page 25: ...es or to one of GE s authorized agents Failure on the part of the responsible individual hospital or institution using this equipment to implement a satisfactory maintenance schedule may cause undue equipment failure and possible health hazards Regular maintenance irrespective of usage is essential to ensure that the equipment will always be functional when required Equipment ID The following grap...

Page 26: ...l for information concerning the limitations of internal and external fetal heart rate monitoring techniques Fetal Monitoring A Corometrics 250cx Series Monitor can be used for routine non invasive and invasive fetal monitoring throughout labor and delivery i e fetal heart rate and uterine activity monitoring Fetal movement detection and Spectra Alerts are options that may be purchased Maternal Mo...

Page 27: ...ements Heart Pulse Rate This parameter is intended for use in the non invasive monitoring of the maternal heart pulse rate MHR P Related Manuals Manual Title 2020550 001 250cx Series Operator s Manual 15457 Maternal Fetal Monitoring Clinical Application 2004435 001 Information For Prescribers ...

Page 28: ...1 14 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Introduction Service Requirements ...

Page 29: ...Revision C 250cx Series Maternal Fetal Monitor 2 1 2036947 001 2 Equipment Overview ...

Page 30: ...2 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 For your notes ...

Page 31: ...es Fetal Model monitors two Fetal Heart Rate channels plus Uterine Activity TOCO or IUP The 250cx Series Maternal Fetal Model monitors maternal NIBP SpO2 and MECG in addition to the features found in the Fetal Model A feature summary follows Fetal Only Monitor Maternal Fetal Monitor US US US2 US2 FECG FECG TOCO TOCO IUP IUP NIBP MSpO2 MECG ...

Page 32: ...nd the modes of operation in use B Trim Knob Control Operation of the monitor is controlled by using the front panel buttons in conjunction with the Trim Knob control This control selects softkeys on the display and positions a cursor within a setup screen Rotate the Trim Knob control left or right to highlight items on the screen with a bar cursor After highlighting the desired item press the Tri...

Page 33: ...g the switch to the off position O turns off the monitor N Strip Chart Recorder Annotations and trends are printed on the strip chart paper Two paper styles are available O Maternal NIBP Connector Connect a pneumatic hose and blood pressure cuff assembly to this black twin lumen connector P Maternal SpO2 Connector Connect a 250cx Series MSpO2 intermediate cable to this royal blue connector Use onl...

Page 34: ...lume for FHR2 Volume settings have no effect on the processing used to determine heart rate The Volume buttons work in conjunction with the volume control settings on the US US2 Setup screen and on the FECG Setup screen V FHR2 Volume Increase Button W FHR1 Volume Decrease Button X FHR1 Volume Increase Button Y Alarm Silence Button Pressing this button silences the audible indication of an individu...

Page 35: ...etal Parameters Primary Labor Parameters Fetal Additional Parameters Maternal Table 2 Display Summary Display Section Item Mode Primary Labor Parameters upper portion of monitor Fetal Heart Rate 1 FHR1 US US2 FECG or INOP Fetal Heart Rate 2 FHR2 US US2 or INOP Uterine Activity UA TOCO IUP or INOP Additional Parameters Available in Maternal Fetal Monitor only Maternal Blood Pressure NIBP Maternal H...

Page 36: ...idence is enabled as indicated by the HBC acronym in the primary labor parameters area All alarms are enabled as indicated by Maternal Fetal Monitor Display Example Setup Screens Review Chapters 3 and 4 of the Corometrics 250cx Series Operator s Manual for information on the individual parameters and setup screens Softkeys A softkey is an area on the screen that can be selected with the Trim Knob ...

Page 37: ...ed to select the waveform for display or to disable the area The ECG Scaling and MECG lead labels are softkeys used to configure the waveform currently displayed Dedicated Softkey Area Softkeys are located at the bottom of each screen Although there are many possible softkeys which may appear in this area a maximum of five are shown at a time ...

Page 38: ...2 FECG NIBP MHR P or MSpO2 Setup screens B ECG Scale Softkey Selects 0 25x 0 5x 1x 2x 4x or Auto C MECG Lead Softkey Selects Lead I II or III D VSHX Softkey Displays maternal Vital Signs History screen See illustration below E Setup Softkey Displays General Setup screen F Alarms Softkey Displays Master Alarm Setup screen G Freeze Softkey Freezes waveform for analysis unfreezes waveform to return t...

Page 39: ...ints all pages screens C View Softkey Scrolls through the data Counterclockwise for newest data Clockwise for oldest data D Exit Softkey Returns to the previous screen A B C D 154 135 17 HX Interval 10 min US2 US TOCO Vital Signs History Date 24 Mar 24 Mar 24 Mar 24 Mar 24 Mar Time 12 00 12 10 12 20 12 30 12 40 NIBP SYS 120 122 122 125 124 DIA 85 87 90 95 90 MAP 94 95 94 105 98 P 74 76 75 81 77 MS...

Page 40: ...nzinger Straße 3 5 D 79111 Freiburg Germany European Representative GE Medical Systems Inc 0086 CANADIAN PATS 1 057 360 1 214 143 U S PATS 3 982 528 4 533 926 4 573 479 J112 A B C D E F G H I J K L M N Table 5 250cx Series Rear Panel Standard and Optional Features Name Description A Vent Provides ventilation for the monitor s internal circuitry B J101 Telemetry Connector Connector for Corometrics ...

Page 41: ...ve for more information I ECG Out Connector External recorder connector for MECG signals The standard output level is 1 V mV J Fetal Acoustic Stimulator Connector Connector for Corometrics Model 146 Fetal Acoustic Stimulator FAST A musical note symbol prints on the strip chart paper each time the Model 146 is used K Remote Event Marker Connector Connector for the Corometrics Remote Event Marker Wh...

Page 42: ...e information Adding Fetal Movement Detection The monitor may be upgraded to include Fetal Movement Detection Contact your GE Service Representative for further information Peripheral Components Nellcor Puritan Bennett Model N 200 Maternal Pulse Oximeter Through this interface MSpO2 readings provided by an NPB Model N 200 are printed at selected intervals on the strip chart paper of the 250cx Seri...

Page 43: ...tation area between the top and bottom grids A filled diamond marker above the measured values marks the time of the reading and identifies the data source as an external device The following is an example annotation FSpO2 45 In addition the FSpO2 trend can be optionally printed on the bottom grid of the strip chart paper the trend is printed as a beaded trace NOTE Your Nellcor N 400 must be at co...

Page 44: ...ters Non standard characters are replaced with spaces The 250cx Series Monitor can be configured with the remote annotation capability enabled 1371 Notes mode or disabled 1371 mode The following is an example of a remote message sent to a 250cx Series Monitor from a central information system using this serial communications protocol SPW AVERAGE VARIABILITY To connect a central information system ...

Page 45: ...nded mode the information provided is increased to include previously unavailable data including algorithm HBC and SpectraAlerts and alarm status 115 and 115X R protocols The 115 and 115X R protocols are legacy central station protocols They provide only basic clinical data to the central station and are included for backward compatibility only Table 6 External Device Summary External Device Param...

Page 46: ... DSP Display PWA is the bridge between the front end and back end sections The front end PWAs are housed in the sealed front end card cage and consist of isolated and un isolated PWAs The recorder assembly houses the recorder PWA The basic block diagram below shows all of the PWAs and external parts as well as their internal block functions The block diagram description on the following page attem...

Page 47: ...printhead Provides sensor data from recorder door paper out paper misload to main board Pass through UI Keypad serial data Front end Motherboard Connects front end bds together distributing isolated power and un isolated power Passes through all analog signals to the DSP board for processing FECG UA Board Converts fetal ECG to analog signal for processing Converts pressure signal to analog for DSP...

Page 48: ...The ECG and ultrasound analog information is processed and heart rates are output to the main board via a shared memory Digital pressure information is received processed and also sent to the shared memory The Display section consisting mainly of a shared memory and timing generator provides the interface between the LCD and the main processor Circuitry for the main processor to adjust the brightn...

Page 49: ...ock AC INPUT 14085 11867 Comm BD J102 HR UA mode DAC s Status Line Outputs US Audio Keypad receive data port Keypad control Status port Telemetry receive Mode line status port UA MECG FECG US Audio Timer audio US AUDIO from US Bd to DSP BD Dual Ultrasound Bd 13692 Comm Line Opto Isolators MSpO2 Module Bd Universal Fspo2 Module Bd FM401 330036 FECG UA Bd MECG Daughter Bd Optional MODE STATUS INPUTS...

Page 50: ...m the rear panel options PWA to allow the added Communication features The Main board PWA formats all the data and interfaces to the recorder PWA The Main PWA also controls all of the audio functions including generated tones to passing ultrasound audio from the ultrasound PWA The following sections show the block diagram of the 250cx Series Main Board PWA and the data flow between the modules the...

Page 51: ... main and volume alarm The main UI keypad has two functions one for input controls and a second for the recorder chart light feature This PWA contains most of the front panel buttons except for the volume and alarm cancel buttons and receives input from the trim knob control The keypad is of the elastomeric type and utilizes backlight LEDs to light each key This PWA also receives the volume alarm ...

Page 52: ...sound PWA generates the ultrasound timing signals to pulse the external patient connected ultrasound transducer crystals and provides the necessary receive circuitry to detect the reflected waveforms It does this by first demodulating the needed signal off of the carrier and filtering the signals which are then sent through the front end motherboard to the DSP where they are digitized and processe...

Page 53: ...ircuitry to drive the stepper motor 4 phase windings To drive the printhead an adjustable power supply is provided which is set to the printhead specifications each printhead is unique Data to be printed and control information is received from the main system PWA buffered and presented to the printhead Sensors from the recorder assembly to detect paper low out misload are received and translated ...

Page 54: ...2 26 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Equipment Overview Theory of Operation ...

Page 55: ...3 1 250cx Series Maternal Fetal Monitor Revision C 2036947 001 3 Installation ...

Page 56: ...3 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 For your notes ...

Page 57: ...n indication that the mother has perceived fetal movement The monitor is factory set with the mark configured as an arrow Refer to Install Options Screens on page 3 14 for more information on selecting the mark Refer to the instructions accompanying the Remote Event Marker for more information about using the accessory ECG Out Connector This 3 conductor stereo phone jack permits recording of FECG ...

Page 58: ...strip chart paper upon commencement of telemetry monitoring and every 30 minutes along with the modes The telemetry disconnected annotation is printed on the strip chart paper if you unplug the telemetry receiver from the 250cx Series Monitor you turn off the receiver you turn off the transmitter or the receiver does not detect any active mode information from the transmitter J102 Connector Spectr...

Page 59: ...Saturation Monitor J109 and J111 only DINAMAP PRO Series 100 400 Monitors DINAMAP ProCare Monitors Quantitative Sentinel Perinatal System any RS 232C connector When shipped from the GE factory all three ports are configured as follows Communications Setup Nellcor baudrate bps 2400 At the above settings connectors J109 and J111 are ready for connection to an NPB Model N 200 Connector J110 does not ...

Page 60: ...h port is factory set to the 1371 Notes mode NOTE The Factory mode is reserved for factory testing only Communications Setup Screen Power 1 Ensure the Power switch is in the off O position Turning the Monitor On Off 2 Connect the detachable line cord to the rear panel power connector plug the other end into a hospital grade grounded wall outlet of appropriate voltage If you are unsure about the vo...

Page 61: ...ks the calibration and internal circuitry of the monitor Initiate the self test routine at the beginning of each monitoring session to print the results on the patient s strip chart NOTE To stop a self test routine that is in progress press the Test button or open the recorder door 1 Press the Test button 2 Refer to Table 7 and ensure the test results are produced as expected At the successful com...

Page 62: ...Monitor Operator s Manual Recorder Test The message TEST ARE ALL DOTS PRINTED prints followed by two vertical lines which should appear continuous Discontinuous lines may be an indication of damaged printhead elements if gaps occur in the same place on both lines Counting Test After the recorder test the display returns to the main screen The software generates a 120 bpm rate in the FHR1 area a 18...

Page 63: ...aded incorrectly the recorder will not print the Record indicator flashes on and off every second three short chimes sound every 3 seconds at a fixed volume of 6 and the message PAPER INCORRECTLY LOADED RELOAD WITH BLACK SQUARES DOWN is displayed overlaying any waveform in the maternal waveform area You may temporarily silence a paper load error condition by pressing the Alarm Silence button The a...

Page 64: ...per through the recorder 3 Hold the package of paper so that the black squares are on the bottom of the pack and the Corometrics logo and page numbers are on the left side of the pack NOTE The black squares indicate the end of the recorder paper When the black squares appear the strip chart recorder has approximately 20 minutes of paper remaining when running at a speed of 3 cm min NOTE The paper ...

Page 65: ...is compatible with and required for the 250cx Series 4 Unfold two sheets from the top of the package so that they extend toward you 5 Place the pack in the drawer so that the pack is laying flat in the recorder 6 Slowly close the strip chart recorder door being careful not to skew the paper ...

Page 66: ...splay FECG US US2 Maternal NIBP MSpO2 MHR P Master Alarm General Setup For information on individual setup screens refer to Chapter 5 of the Corometrics 250cx Series Monitor Operator s Manual For information on default settings refer to the Table Factory Defaults on page 3 23 Service Mode Screens The 250cx Series Monitor is programmed with five service mode screens These screens are listed below S...

Page 67: ... 1 Select the Setup softkey to display the General screen 2 Select the Service softkey from the General Setup screen 3 The Service Lock screen appears and the access code is displayed as 0 0 0 0 Service Lock Screen 4 The access code is the current month and day MMDD or day and month DDMM however your monitor is configured Use the Trim Knob to enter the access code For example April 23 is 0 4 2 3 2...

Page 68: ...estart NextPage Language Line Frequency Scaling HR Offset Paper Chime Paper Volume HBC FM Remote Mark Recorder Font Size SpO2 Scale English 60 Hz 30 240 Large Low Out 5 On On Off Auto Only with 259 Model VS Print Interval Real Time Install Options Screen 2 Log PrevPage Restart Fetal Alert Alarm FECG Artifact Elimination Smart BP NIBP 1 min Interval NIBP Display SatSeconds Store Current To Hospital...

Page 69: ...uto scale is also affected by this setting When the heart rate scale is 30 240 the MSpO2 expanded scale is 60 100 10 cm When the heart rate scale is 50 210 the MSpO2 expanded scale is 50 100 12 5 cm Recorder Font Size The monitor offers a choice of font sizes to print annotations Small increases print speed Medium a compromise between the large and small sizes Large fosters readability VS Print In...

Page 70: ...min On and Off The factory default setting is 10 min What is it When monitoring dual heart rates using US US2 or FECG US overlapping traces may be difficult to interpret All 250cx Series Monitors provide a 20 bpm shift for the secondary fetal heart rate trend to alleviate this problem When using US US2 or FECG US2 and the US2 trace is shifted 20 bpm the symbol prints on the upper portion of the to...

Page 71: ...t at a fixed scale of 0 100 Fetal Alert Alarms If the Spectra Alerts option is installed in your monitor use this field to select between the built in FHR alarm features of the monitor and the Spectra Alerts option Alarms The monitor generates alarms based on the limit settings provided on the FHR setup screens Alerts Enables the Spectra Alerts feature to analyze heart rate and uterine activity da...

Page 72: ...ed or loosely connected are recorded when FECG artifact elimination is turned off They are not recorded when FECG artifact elimination is turned on instead gaps pen lift in the tracing occur Default TOCO Reference This field sets the default uterine activity pressure reference for the tocotransducer Use the Trim Knob control to cycle through the available settings 5 10 15 20 or 25 relative units i...

Page 73: ...iomed may set the SatSeconds limit Off 10 25 50 or 100 to suit the clinical environment and patient condition Default Settings The 250cx Series Monitor is shipped with factory defaults for the setup screens You can change most of these settings to suit your particular needs The monitor has two Default Settings that allow you to determine the settings on the next power on or restart Factory or Hosp...

Page 74: ...of each system setup screen user and service is printed on the strip chart paper The following screen summaries are printed Diagnostic Control Communications Setup Install Options General Setup Master Alarm Setup Vital Signs History MSpO2 Setup MHR P Setup NIBP Setup FECG Setup US Setup US2 Setup NOTE The FECG US and US2 Setup screens are shown together in one group In addition the HR Offset field...

Page 75: ...ons Setup screen appears Baudrate This field selects the baudrate for communication with an external device Use the Trim Knob control to cycle through the available settings 600 1200 2400 4800 9600 and 19 200 bps Each port is factory set to 2400 bps Refer to Peripheral Components on page 2 14 for more information about configuring this field Mode This field selects the mode for communication with ...

Page 76: ... switches configure the operational characteristics of the 250cx Switch Name Setting 1 Factory Test Off Enabled 2 J102 Levels Off HP On Coro 3 RESERVED Set to Off 4 NIBP Option Off Enabled 5 MSpO2 Option 5 Off 6 Off Nellcor 5 Off 6 On Ohmeda 5 On 6 Off Masimo 5 On 6 On No MSpO2 6 7 RESERVED Set to On 8 MECG Option Off Enabled ...

Page 77: ... 5 1 9 NIBP Initial Target Pressure 135 mmHg 18 0 kPa 100 250 mmHg in increments of 5 13 3 33 3 kPa in 0 7 steps Mode Manual Manual 1 2 3 4 5 10 15 20 30 40 45 60 90 120 min NIBP Done Vol 5 0 9 Alarm mmHg mode Systolic Diastolic MAP MHR P High Low 160 90 mmHg 90 50 mmHg 140 50 mmHg 120 50 bpm High Low 70 240 50 150 70 130 30 120 70 150 30 120 100 250 35 120 Alarm kPa mode Systolic Diastolic MAP MH...

Page 78: ...h Low 120 50 bpm High Low 100 250 35 120 Alarm Volume 5 1 9 MECG Lead II I II III Pacer Off On Off Normal Operation Waveform Display MECG FECG MECG MSpO2 Off MECG Waveform Size 1X 1 mV cm 0 25X 0 5X 1X 2X 4X Auto Master Alarm Setup Alarm Limits mmHg Systolic Diastolic MAP MHR P MSpO2 High Low 160 90mmHg 90 50 mmHg 140 50 mmHg 120 50 bpm 100 95 High Low 70 240 50 150 70 130 30 120 70 150 30 120 100...

Page 79: ...cm min Date Set to current local date Set to current local date Time Set to current local time Must manually change to EST EDT Set to current local time MSpO2 Print Interval External Monitor 5 min Off 2 5 10 15 30 60 min FSpO2 Print Interval External Monitor 5 min Off 2 5 10 15 30 60 min FSpO2 Trace Off Off On Vital Signs History HX Interval Event 1 5 10 15 30 60 Event Table 1 Summary of Factory D...

Page 80: ...r is FHR2 10 min Off On 10 min FM Fetal Movement Remote Marker On On Off SpO2 Scale 0 100 Auto 0 100 Does not change Install Options Screen 2 Service Fetal Alert Alarm Off Off Alarms Alerts Alert Suspend Off Off On Re Alarm MECG and SpO2 only 120 sec 120 300 seconds in 5 second intervals VS Vital Signs Print Interval Real Time Real Time Chart Style Default TOCO Reference 10 in mmHg mode or 1 3 in ...

Page 81: ...Revision C 250cx Series Maternal Fetal Monitor 4 1 2036947 001 4 Maintenance ...

Page 82: ...4 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 For your notes ...

Page 83: ...es calibrate annually or when the monitor operation is suspect FECG UA board voltages calibrate annually or when the monitor operation is suspect Printhead adjust remove replace as needed Recorder board photo sensors adjust remove replace as needed Pneumatic pressure check annually Unit to primary leakage as needed Patient to line leakage for ECG as needed Patient to line leakage for IUP as needed...

Page 84: ...mage Physical damage to a flat panel display glass may pose an implosion hazard Have the flat panel display replaced by qualified service personnel if necessary Safety labels and inscription on the device are clearly legible NOTE If an accessory is not listed consult the manufacturer s instructions MSpO2 Measure voltage breakdown as needed US Measure voltage breakdown as needed US2 Measure voltage...

Page 85: ...leaning solutions per manufacturers recommendations 2 Wipe off cleaning solutions with a clean dry cloth 3 Do not use a cleaning substance containing wax 4 Do not pour or spray water or any cleaning solution on the equipment or permit fluids to run behind switches into the connectors into the recorder or into any ventilation openings in the equipment 5 Do not use the following cleaning agents Abra...

Page 86: ...e transducers from the monitor NOTE Only Nautilus transducers are immersible 1 Dampen a cloth or paper towel with one of the following products then wring out until only slightly wet Sodium Hypochlorite 5 25 Bleach diluted 10 1 Cidex Sporicidin Soap and water 2 Rub soiled area until clean taking care not to excessively wet the tocotransducer diaphragm seal Rub around the seal 3 Dry with a soft dry...

Page 87: ...rse hoses Do not immerse cuffs without prior application of cuff hose caps Materials Enzymatic detergent such as ENZOL enzymatic detergent US or Cidezyme enzymatic detergent UK Distilled water 10 solution of household bleach 5 25 sodium hypochlorite in distilled water Soft cloths and soft bristled brushes Spray bottles Procedure 1 Prepare the enzymatic detergent according to the manufacturer s ins...

Page 88: ...their packaging are damaged they must be disposed of as advised in this appendix To clean or disinfect the sensor 1 Saturate a clean dry gauze pad with the cleaning solution Wipe all surfaces of the sensor and cable with this gauze pad 2 Saturate another clean dry gauze pad with sterile or distilled water Wipe all surfaces of the sensor and cable with this gauze pad 3 Dry the sensor and cable by w...

Page 89: ...vel of greater than 10 M ensures that the leakage current is within acceptable levels for safe use on patients 6 Leave transparent dome attached to the transducer during storage but slacken the locking ring at least one quarter of a turn CAUTION STERILIZATION Prior to patient use ensure the dome is sterile Disposal of Product Waste As you use the 250cx Series monitor you will accumulate solid wast...

Page 90: ...red tools to perform all electrical safety tests in this section IMPORTANT UNITS OF MEASURE The specified leakage tester E278 06 measures in mV There is a direct correlation of mV to μA In other words on this text fixture 1 mV 1 μA 220 230 240 VAC POWER CORD For 220 230 240 VAC testing use only P N 600034 line cord to power the E278 06 test fixture Initial Conditions 1 Attach the monitor power cor...

Page 91: ...onnect the monitor s power cord to the leakage tester 2 Connect ECG leads to the leakage tester 3 Select the leakage tester s settings to measure Lead to Ground leakage current for all leads as appropriate 4 Turn on the monitor 5 Verify and record the results for all conditions listed in Electrical Safety section of the Preventative Maintenance Report Patient to Line ISO Leakage for MECG FECG 1 Wi...

Page 92: ...ansducer in aluminum foil or immerse in normal saline solution 4 Select the leakage tester s settings to measure Lead to Line leakage current for all leads as appropriate 5 Connect the leakage tester external clip lead Probe and connect immerse as appropriate 6 Apply Line Voltage by pressing the appropriate leakage tester control 7 Verify and record the results for all conditions listed in Electri...

Page 93: ...d Leakage for SpO2 1 With the leakage tester connected to power connect the monitor s power cord to the leakage tester 2 Connect Simulator Cable 2006036 to the monitor 3 Connect the leakage tester external lead to the Simulator cable 4 Select the leakage tester s settings to measure Lead to Ground leakage current as appropriate 5 Power the monitor on 6 Verify and record the results for all conditi...

Page 94: ...t body to the monitor s front panel ECG input The MECG test body can be a shorted MECG cable or the assembly leakage cable Measure the voltage breakdown F pass F fail IUP Connect an IUP test body to the monitor s front panel UA input The IUP test body can be a SensorTip cable wrapped in aluminum foil or the assembly leakage cable Measure the voltage breakdown F pass F fail MSpO2 Connect an MSpO2 t...

Page 95: ...to the monitor s front panel ECG input The MECG test body can be a shorted MECG cable or the assembly leakage cable Measure the voltage breakdown F pass F fail IUP Connect an IUP test body to the monitor s front panel UA input The IUP test body can be a SensorTip cable wrapped in aluminum foil or the assembly leakage cable Measure the voltage breakdown 1 2 0 2 4 0 CAUTION FEDERAL LAW RESTRICTS THI...

Page 96: ...to the hi pot tester as shown in the following figure NOTE The hi pot tester voltage is 2 121 kVdc Mains to Chassis Using DC Voltage for 1 Minute Checkout General Like all electronic monitoring devices internal and external components are subject to fatigue wear and the potential for failure over time and under varying conditions of use Additionally events such as dropping the monitor spilling liq...

Page 97: ...ion 1 Check the Voltage Selection switch on the rear panel of the 250cx Series Monitor and ensure it matches the line voltage of the connector to be used Connect the detachable line cord to the rear panel power entry module plug the other end into a hospital grade grounded wall outlet of appropriate voltage 2 Place the front panel Power switch in the on I position When the power is first turned on...

Page 98: ...e data In other words the value is always referenced to 0 mmHg regardless of any UA referencing attempt NOTE The recorder returns to its original on off or maternal only mode state from when the Test button was depressed NOTE To disable the test depress the Test button or open the recorder door NOTE If the simulated fetal heart rate trends do not appear in the correct positions on the strip chart ...

Page 99: ...ce button and verify that the recorder paper advances at a rate of 40 cm min by measuring 5 Release the Paper Advance button and verify that the recorder prints the message 1 cm min by measuring 6 Access the Install Options Screen 1 again and follow Steps 3 6 performing the same tests on the other two options 2 cm min and 3 cm min 7 Depress the monitor s front panel Mark Offset button and verify t...

Page 100: ...or s display until the monitor reads a value of 30 bpm The MHR P mode is MECG The MHR heartbeat indicator flashes at a rate of 30 times per minute The UA mode is TOCO 6 Access the Install Options Screen 2 and note the Default TOCO Reference value Exit the service mode by selecting Restart at the bottom of the screen 7 After the monitor restarts press the monitor s front panel UA Reference button 8...

Page 101: ...er prints an oscillation of 15 bpm between 110 and 125 bpm on the top grid of the strip chart paper Refer to MECG Oscillation on page 4 22 Repeat Step 13 for rate values of Δ22 and Δ27 The results should be the same except that the MHR value alternates between two rates 22 bpm or 27 bpm apart and the recorder prints an oscillation of 22 or 27 bpm The top value is always at approximately 125 bpm Re...

Page 102: ...ies Maternal Fetal Monitor Revision C 2036947 001 Maintenance MECG Test strip chart paper after approximately 30 seconds 14 Set the simulator s ECG Mode switch to the Off position MECG Ramp MECG Oscillation 15 22 27 ...

Page 103: ...at a rate of 30 times per minute The UA mode is TOCO 6 Depress and hold the monitor s UA Reference button and release when the UA value shows 10 relative units in mmHg mode or 1 3 kPa in kPa mode Verify the following on the monitor The UA value is referenced to 10 mmHg 1 3 kPa on the display The recorder prints a continuous line at 10 mmHg 1 3 kPa on the bottom grid of the strip chart paper The re...

Page 104: ... signal The ECG beep is heard from the rear panel speaker The recorder prints an oscillation of 15 bpm between 110 and 125 bpm on the top grid of the strip chart paper Refer to FECG Artifact Elimination on page 4 26 13 Repeat Step 12 for rates values of Δ22 and Δ27 The results should be the same except that the FHR1 value alternates by either 22 or 27 bpm and the recorder prints an oscillation of ...

Page 105: ...e FHR1 value oscillates by 27 bpm The FHR1 heartbeat indicator flashes for each input signal The ECG beep is heard from the rear panel speaker The recorder does not print any oscillation 18 Access Install Options Screen 2 and set the FECG Artifact Elimination back to Off 19 Set the simulator s ECG Rate switch to the MANUAL position and the Manual Adjustment knob to the counterclockwise position Di...

Page 106: ...roximately 120 bpm Verify the following on the monitor The FHR1 value is 120 bpm The FHR1 mode is US The FHR1 heartbeat indicator flashes at a rate of 120 times per minute Ultrasound audio volume from the rear panel speaker can be increased or decreased using the upper left pair of Volume buttons Set the volume to the desired level The recorder prints a continuous line at 120 bpm on the top grid o...

Page 107: ... 8 Place the simulator s US Rate switch in each of the individual rate settings 50 60 120 and 210 bpm Verify the following on the monitor The FHR1 value reflects the simulator setting 1 bpm The FHR1 heartbeat indicator flashes at the simulator setting Ultrasound audio is heard coming from the rear panel speaker The recorder prints a continuous line at the respective value 3 bpm on the top grid of ...

Page 108: ...ulator s Manual Adjustment knob to input an ultrasound signal of approximately 120 bpm Verify the following on the monitor The FHR1 value is 120 bpm The FHR1 mode is US The FMD indication displays in between the FHR1 and FHR2 mode title locations if alerts are not enabled The FHR1 heartbeat indicator flashes at a rate of 120 times per minute Ultrasound audio volume from the rear panel speaker can ...

Page 109: ...ble strain relief and connector pins 2 Disconnect the simulator s ultrasound cable from the front panel of the 250cx Series Monitor 3 Connect the ultrasound transducer to either the US or US2 input connector on the front panel of the monitor Verify the following on the monitor The FHR1 value shows three steady dashes The FHR1 mode is US Table 5 Fetal Movement Detection Test Simulator Settings Sect...

Page 110: ... of the functional checkout procedure tests the uterine activity section of the 250cx Series Monitor 1 Set the switches on the Model 325 Simulator according to Table 6 Uterine Activity Test Simulator Settings on page 4 31 2 Connect the simulator s UA cable to the UA connector on the monitor 3 Access the Install Options Screen 2 and select Pressure units mmHg mode 4 Access the Install Options Scree...

Page 111: ... of the strip chart paper The recorder prints the messages UA REF on the strip chart paper 10 Place the simulator s UA Level switch at each of the level settings 0 10 50 and 100 mmHg Verify that the UA value is displayed accordingly and that the recorder prints a continuous line at the corresponding value on the uterine activity channel of the strip chart paper 11 Place the simulator s UA Level sw...

Page 112: ...train relief and connector pins 2 Connect the tocotransducer to the UA input connector on the front panel of the 250cx Series Monitor IMPORTANT TRIMLINE TOCOTRANSDUCER If you are using an older Trimline tocotransducer for this test be advised of the following If the monitor is on when you connect or re connect a Trimline Tocotransducer to the UA connector you must wait at least 10 seconds before p...

Page 113: ...ce The recorder prints the message UA INOP on the center margin of the strip chart paper after approximately 20 seconds Strain Gauge Transducer Test 1 Inspect a strain gauge as follows Unscrew the plastic dome from the transducer and check for any cracks or contaminants on the transducer Visibly assess the condition of the cable strain relief and the connector pins 2 Connect the strain gauge to th...

Page 114: ...e simulator can be used to test any of the following mode combinations of the monitor FECG TOCO FECG IUP MECG TOCO MECG IUP US TOCO US IUP US FMD TOCO US FMD IUP US2 TOCO US2 IUP FECG US TOCO FECG US IUP FECG US2 TOCO FECG US2 IUP US TOCO MECG US IUP MECG US2 TOCO MECG US2 IUP MECG NOTE US US2 cannot be tested simultaneously unless two Model 325 Simulators Model 250cx Series ultrasound transducers...

Page 115: ...nnector on the 250cx Series Monitor 2 Connect the Model 325 Simulator s ECG cable to the FECG input on the monitor s Y adapter cable 3 Connect the simulator s US cable to the monitor s US input connector 4 Set the switches on the Model 325 Simulator according to Table 7 5 If not already on depress the monitor s Record button 6 Verify the following on the monitor The FHR1 value reads 120 bpm 1 bpm ...

Page 116: ...sound mode of the 250cx Series Monitor cannot be tested unless two Model 325 Simulators are used or two Model 250cx Series ultrasound transducers Do not attempt to test dual ultrasound using one Table 7 Dual Heart Rate Test Non Pattern Simulator Settings Section Switch Setting FECG MECG Rate CMR RATE Rate 120 bpm Mode FECG QRS Amplitude 50 µV QRS Polarity ULTRASOUND FMD Mode US Level MED Rate RAMP...

Page 117: ...ndicator responds to the input The recorder prints the heart rate tracing corresponding to the rate and the trace is plain black 5 Use your finger to rub the face of the ultrasound transducer connected to the monitor s US2 input connector try to maintain a steady rate and verify the following on the monitor The FHR2 value responds to the rubbing The FHR2 heartbeat indicator responds to the input T...

Page 118: ...on is removed following steps The MECG value flashes 16 Depress the monitor s front panel Alarm Silence button and verify the following The alarm tone is silenced The ALARM SILENCE X XX message box appears on the screen and a countdown is started 17 Wait the user specified re alarm time and verify the following The alarm tone is once again emitted from the rear panel speaker 18 Use the simulator s...

Page 119: ...tone is silenced The MECG value no longer flashes After 10 seconds the two above conditions are still true MSpO2 Test 1 Access the 250cx Monitor s MSpO2 Setup window and configure as follows Nellcor only Response Time Fast Masimo only Sensitivity Normal Masimo only Averaging 8 Print Interval 2 minutes O2 Trace On 2 Access the monitor s Install Options Screen 1 and set the SpO2 Scale to Auto Select...

Page 120: ... Volumes Only one air volume is required The proper volume for all calibration procedures is a Normal cuff wrapped around a 3 inch rigid cylinder External Manometer A peak reading external manometer is recommended The external manometer must be capable of reading to 350 mmHg 46 7 kPa Do not use a DNI CuffLink for calibration procedures on a 250cx Series Monitor External Pump Use a hand bulb for al...

Page 121: ...e option 2 The monitor will inflate the cuff to approximately 200 mmHg 3 If either PT1 or PT2 pressure from the external manometer are 2 mmHg 0 3 kPa different from the monitor indicated pressure then perform Calibrate Transducers procedure 4 To stop Calibration Verification select Done which appears after the Verify softkey has been pressed 5 The monitor will vent pressure to atmosphere and re ze...

Page 122: ...on and retest Overpressure Detection 8 Call Technical Support 9 Upon detection of overpressure the monitor will vent pressure to atmosphere and re zero the transducers 10 The maximum monitor detected pressure will be displayed near the bottom of the NIBP Calibration screen System Leakage 1 Select Leak Test from Mode Make sure you have the 12 foot hose and Normal Adult Cuff tightly wrapped around a...

Page 123: ...ing materials designed for protection of electrostatic sensitive components Checking a Display In troubleshooting the following methods can be employed to determine whether a problem exists with the display assembly the 250cx Series Monitor DSP Board or the interconnect cable Verifying the DSP Board Operation 1 Turn off the monitor 2 Remove the nine screws which secure the monitor top cover Four s...

Page 124: ...d you have another properly functioning 250cx Series Monitor substitute the entire display assembly and check for proper operation Refer to Checkout and Checkout Contact your GE Service Representative for ordering information External Display Connect a known good display and check display Display should match LCD display for content and closely mimic colors Maternal SpO2 Calibration The 250cx Seri...

Page 125: ...hardware switch settings SW1 on the Main Motherboard without removing the cover of the monitor The switch settings are displayed from left SW1 8 to right SW1 1 Refer to Table 17 To access the Diagnostic Control screen select the Service softkey at the bottom of the General Setup Screen Input the Service Lock access code then the Install Options Screen 1 appears Select the Tests softkey from the bo...

Page 126: ...2 screen displays See figure J102 Analog Output Connector Screen on page 4 47 3 The Range and Voltage fields can be displayed using a decimal point or a comma as a separator Each activation of the Decimal softkey at the bottom of the screen alternates between using a decimal and a comma 4 Use the Trim Knob control to cycle through the available settings for each field The expected voltage for each...

Page 127: ...ges for the HR1 HR2 and UA signals If a measured value does not fall within the given range adjust the corresponding potentiometer accordingly on Communications Board No 13388 or 15297 J102 Analog Output Connector Screen J102 Pin Signal Range Voltage Meaning 3 Analog Gnd 0 00 0 0 7 HR1 1 2 1 20 bpm 22 HR2 1 2 1 20 bpm 2 UA 1 2 1 20 0 17 HR1Mode 10 10 00 1 HR2Mode 10 10 00 Test 24 UAMode 10 10 00 2...

Page 128: ...unications Setup screen See Communications Screen on page 4 49 2 Insert a loopback test connector into each communications port being tested 3 Set the mode field on the Communications Setup screen to Loopback Notice that the word Off displays to the right of the mode HR2 J102 pin 22 1 2 V 10 mV R27 240 bpm 1 2 V 10 mV R29 UA J102 pin 2 0 relative units mmHg and kPa 1 2 V 10 mV R42 100 mmHg 13 3 kP...

Page 129: ...as failed contact your GE Service Representative Do not use this port to connect to any peripheral equipment until the port or Communications Board has been serviced RJ 11C Connector Communications Screen Table 12 J109 J110 and J111 Communications Ports Connector Pinout J109 J110 Or J111 Pin Signal Description 1 RTS 2 RXD 3 GND 4 GND 5 TXD 6 CTS Exit Communications Setup Baudrate Mode J111 2400 Lo...

Page 130: ...y drawing numbers are given for each board in this section The electronic calibration procedure outlined in this section necessitates removal of the monitor s top cover Also the following equipment will be needed in order to carry out the procedural steps Digital Voltmeter 4 1 2 digit or equivalent Plastic Alignment Tool Oscilloscope Handling Precautions The following guidelines should be followed...

Page 131: ...on the FECG UA Board Connect the negative lead to TP2 or TP3 isolated ground Adjust R28 for a reading of 4 00 Vdc 0 01 Vdc Table 13 Main Board Power Supply Voltages 2023111 001 Signal Name Voltage Level Pin 1 12EL 12 Vdc 0 5 Vdc Pin 2 20I 20 Vdc 0 5 Vdc Pin 3 15BP 15 Vdc 0 5 Vdc Pin 4 15V 15 Vdc 0 5 Vdc Pin 5 15V 15 Vdc 0 5 Vdc Pin 6 12A 12 Vdc 0 5 Vdc Pin 7 5V 5 Vdc 0 5 Vdc Pin 8 GND Pin 9 No Con...

Page 132: ... load the paper so that black squares show on the surface i e the last several sheets of a pack 8 Turn on the recorder 9 The value on the digital voltmeter should go up and down as the paper surface alternates between black and white Verify that the maximum value is greater than or equal to 2 0 Vdc 10 Turn off the recorder Adjusting the Paper Out Photosensor 1 Load paper in the recorder Ensure tha...

Page 133: ... digital voltmeter connect the positive lead to J9 pin 6 on the Recorder Board connect the negative lead to J9 pin 2 3 Adjust R41 for a reading of 190 mVdc 5 mVdc on the digital voltmeter 4 Although a factory only fixture is required for this step you may wish to try it by estimating the required distance Load paper backwards with the white surface 0 380 in away from the paper tray This creates a ...

Page 134: ...4 54 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Maintenance Repair Log Repair Log Unit Serial Number Institution Name Date Maintenance Repair Technician Date ...

Page 135: ...ear and or signs of damage Refer to Visual Inspection on page 4 4 Digital Multimeter Static Free Work Surface Plastic Alignment Tool Mild Soap Water Solution Standard Hand Tools Isopropyl Alcohol Leakage Current Tester Baum Manometer Leg Plate 1590AAO with 1442AAO adapter cable FECG MECG Adapter 1442AAO Model 325 Simulator with Cables Baum Test Connector ESD Mat and Wristband 250cx Operator s Manu...

Page 136: ...cables 4 5 Clean the monitor accessories cuffs hoses Calibration Page Description Complete Max Actual Pass Fail N A 4 50 Verify the power supply voltages on the Main Board 4 51 Verify the power supply voltages on the Isolated Power Supply Board 5 9 Adjust the printhead 4 52 Adjust the photosensors on the Recorder Board Electrical Safety Test Record AC Line Voltage Nominal 10 Ground Impedance 0 1 O...

Page 137: ...0 µA 50 µA IUP Toco Ld Line 10 µA 50 µA US1 Ld Gnd 10 µA 50 µA US1 Ld Line 10 µA 50 µA US2 Ld Gnd 10 µA 50 µA US2 Ld Line 10 µA 50 µA SpO2 Ld Gnd 10 µA 50 µA SpO2 Ld Line 10 µA 50 µA Functional Checkout Tests Page Description Complete Max Actual Pass Fail N A 5 3 Monitor Self Test 4 19 Front Panel Button Test 4 20 MECG Test 4 23 FECG Test Leg Plate Test Follow Manufacturer s Directions 4 26 Ultras...

Page 138: ...on C 2036947 001 Maintenance Preventative Maintenance Inspection Report 4 34 Pattern Memory Test 4 35 Dual Heart Rate Test 4 47 Dual Ultra Sound Modes 4 37 Alarm Test 4 39 MSpO2 Test 4 40 Pneumatic Pressure Check annual 5 6 Recorder Calibration Test ...

Page 139: ...Revision C 250cx Series Maternal Fetal Monitor 4 59 2036947 001 Maintenance Preventative Maintenance Inspection Report Comments ...

Page 140: ...4 60 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Maintenance Preventative Maintenance Inspection Report ...

Page 141: ...Revision C 250cx Series Maternal Fetal Monitor 5 1 2036947 001 5 Troubleshooting ...

Page 142: ...5 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 For your notes ...

Page 143: ...em on the DSP Board If the monitor displays any of these messages turn off the monitor and contact your GE Service Representative Monitor Self Test The 250cx Series Monitor contains self test routines which verify the unit s calibration and internal circuitry These routines are initiated by depressing the front panel Test button The test results are printed on the strip chart recorder paper verify...

Page 144: ...the Install Options Screen 1 displays a Select NextPage b The Install Options Screen 2 displays 4 Select the Log softkey from the Install Options Screen 2 5 The first Event Log screen displays 6 Use the Page softkey to display the next screen page if applicable The last page wraps back to the first page 7 Use the Print softkey to print the displayed screen page on the strip chart recorder 8 Use th...

Page 145: ...urse Call Interface relay CPU software version number DSP software version number Monitor Run Time Recorder run time Rec Time Clear softkey sets run time and record to 0 00 Main Board SW1 switch setting summary Softkey to access J102 test screen and Softkey to access the NIBP Calibration screen Diagnostic Control J102 Exit Diagnostic Control Recorder Calibration Off Status Relay Off NIBP Cal CPU V...

Page 146: ...pm for domestic paper 50 bpm and 210 bpm for international paper The recorder prints a vertical line spanning across both grids every 3 16 inch Refer to figure below 2 Use this test while performing the adjustments in Recorder Servicing on page 5 7 The test will continue to print the lines until you cycle power on the monitor or set the calibration field on the Diagnostic Control screen back to Of...

Page 147: ...ill avoid unnecessary damage to bezel s mounting screws and the unit s front panel connectors 1 Turn off the 250cx Series Monitor and disconnect the power cord from the monitor 2 Remove the nine screws which secure the monitor top cover Four screws are located on the bottom of the monitor and five screws are located in the back 3 Remove the cover by sliding it toward the rear of the monitor 4 Remo...

Page 148: ... gauges and fixtures to ensure critical tolerances are satisfied this includes drive roller assemblies Therefore field replacement is not recommended and field servicing is limited to the following recorder subassemblies Stepper Motor and Harness Printhead Paper Low Photosensor Paper Out Photosensor Paper Loading Photosensor CAUTION PRINTHEAD FAILURE If a sudden or complete failure of the printhea...

Page 149: ...fset Adjustment To check vertical offset alignment run at least two monitor self tests by depressing the front panel Test button The first horizontal trace should be printed 0 490 0 002 inch from the right hand paper guide Refer to figure Vertical Offset Adjustment Self Test Trace on page 5 13 Perform the following steps if the trace does not fall within the specified offset range 1 Loosen the two...

Page 150: ... you have a short screwdriver you will not need to remove the strip chart recorder from the monitor 1 Turn off the 250cx Series Monitor and disconnect the power cord from the monitor 2 Remove the nine screws which secure the monitor top cover Four screws are located on the bottom of the monitor and five screws are located in the back 3 Remove the cover by sliding it toward the rear of the monitor ...

Page 151: ...lue is the VHEAD voltage The voltage rating should be marked over the old voltage rating on the printhead bracket 3 Re connect the harness cable to the printhead 4 Slide the new printhead into position through the recorder door and under its bracket Push on the center of the printhead to ensure it is pushed all the way back 5 Align the printhead with the front holes in the bracket and replace the ...

Page 152: ...5 12 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Troubleshooting Diagnostic Control Screen Recorder Top View Recorder Right Side View J6 J5 J3 J4 J1 J2 J8 A D E A B C ...

Page 153: ... following procedure NOTE When facing the front of the monitor the paper low sensor is on the right side the paper out sensor is on the left side Removing the Paper Low Paper Out Photosensor Use the following procedure for removing the paper low or paper out photosensor 1 Turn off the 250cx Series Monitor and disconnect the power cord from the monitor 2 Remove the nine screws which secure the moni...

Page 154: ...ure with all nine screws Adjusting the Paper Low Photosensor Refer to Recorder Photosensor Calibration on page 4 52 for detailed instructions Adjusting the Paper Out Photosensor Refer to Recorder Photosensor Calibration on page 4 52 for detailed instructions Paper Loading Sensor Follow the instructions for Recorder Servicing on page 5 7 before following this procedure Removing the Paper Loading Ph...

Page 155: ...n the cable so that when the recorder door is opened the cable does not become taut Re install the strip chart recorder Refer to Installing the Strip Chart Recorder on page 5 7 Do not replace the monitor top cover yet 5 Adjust the paper loading sensor as described next in this section Adjusting the Paper Loading Sensor Refer to Recorder Photosensor Calibration on page 4 52 for detailed instruction...

Page 156: ...ars In the center of the screen are four single digit fields below the field Enter Access Code These fields are used to enter the code to access restricted service settings in the 250cx Series Monitors The access code is the current date setting in the form of M M D D or D D M M where M M is the current month 01 to 12 and D D is the current date 01 through 31 however your monitor is configured NOT...

Page 157: ...r Off NOTE The software does not permit the alarm settings to overlap 8 To exit the Service mode follow the instructions at the top of Page 16 How do I change the alarm limits for Fetal Heart Rate 2 1 Rotate the Trim Knob to highlight the field for FHR2 This field is at the top left on the display and it may read INOP or US2 2 Once you highlight the FHR2 field press the Trim Knob The display chang...

Page 158: ...ange the MHR P Maternal Heart Rate Pulse High select a value between 100 bpm and 250 bpm NOTE The MHR P alarm settings are also available through the Pulse softkey or the MSpO2 softkey on the main monitoring screen You may optionally change the MHR P Low select a value between 35 bpm and 120 bpm NOTE The MHR P alarm settings are also available via the Pulse softkey or the MSpO2 softkey on the main...

Page 159: ... MHR P Setup screen 3 Now rotate the Trim Knob to highlight the Source setting It will read Auto MSpO2 MECG 4 Once the Source setting is highlighted press the Trim Knob again The current setting displays in blinking inverse video 5 Now rotate the Trim Knob to change the current setting Select from Auto MSpO2 MECG If you select Auto the pulse value parameter is automatically selected according to t...

Page 160: ...O2 Scale setting is highlighted press the Trim Knob again The current setting displays in blinking inverse video 8 Now rotate the Trim Knob to change the current setting Select a setting of 0 100 or Auto 9 Once you set the desired trace setting press the Trim Knob again to confirm The current setting stops blinking 10 To exit the Service mode follow the instructions at the top of Page 16 How do I ...

Page 161: ...ng inverse video 5 Now rotate the Trim Knob to change the current setting to MECG 6 Once you set the desired source parameter press the Trim Knob again to save the value The current value setting stops blinking 7 Now rotate the Trim Knob to select highlight the MECG Lead setting This setting is slightly above vertical center towards the right side of the screen and indicates Lead I II or III 8 Now...

Page 162: ...le press the Trim Knob to confirm your selection The current value setting stops blinking and the waveform should reflect the selected lead How do I disable enable Fetal Movement Detection FMD is an optional feature that is purchased separately 1 Rotate the Trim Knob to highlight the field for US This field is top left on the display NOTE This feature applies only if ultrasound is the source 2 Onc...

Page 163: ...l audio tone indicative of the alarm volume is emitted from the speaker 11 To exit the Service mode follow the instructions at the top of Page 16 How do I enable or change alarm volume settings for Fetal Heart Rate 2 1 Rotate the Trim Knob to highlight the field for FHR2 This field is top left on the display and may display as INOP or US2 2 Once the FHR2 field is highlighted press the Trim Knob Th...

Page 164: ...mmediately to the right The setting is in the range of 1 to 9 4 Once the Alarm Volume setting is highlighted press the Trim Knob again The current setting displays in blinking inverse video and an audio tone indicative of the alarm volume is emitted from the speaker 5 Now rotate the Trim Knob to change the current setting as desired With each setting change an audio tone indicative of the alarm vo...

Page 165: ...onfirm your selection The current value setting stops blinking 7 To exit the Service mode follow the instructions at the top of Page 16 How do I change the volume for FHR2 audio or heart beat tones Option 1 1 Use the front panel Volume Up or Volume Down buttons right to control volume for FHR Channel 2 Option 2 1 Rotate the Trim Knob to highlight the field for FHR2 This field is top left on the di...

Page 166: ...ion The current value setting stops blinking 7 To exit the Service mode follow the instructions on Page 16 How do I change the volume for NIBP completion indication 1 Rotate the Trim Knob to highlight the field for NIBP This field is slightly above center on the left side of the display 2 Once the NIBP field is highlighted press the Trim Knob The display changes to show the NIBP Setup screen 3 In ...

Page 167: ...matically sets the Default Settings to Hospital How do I set change RS232 serial communications baudrates and protocols 1 Enter Install Options Screen 1 Refer to How do I access the service setup install options screens on page 5 27 2 In Install Options Screen 1 rotate the Trim Knob to highlight the COMM softkey at the bottom of the display below the menu bar 3 Press the Trim Knob to enter the Com...

Page 168: ...d or Off disabled 4 Once the HBC setting is highlighted press the Trim Knob again The current setting displays in blinking inverse video 5 Now rotate the Trim Knob to change the current volume setting Select a value 6 Once you set the desired value press the Trim Knob again to save the value The current value setting stops blinking 7 To exit the Service mode follow the instructions at the top of P...

Page 169: ...uto 60 min Auto 90 min or Auto 120 min 6 Once you set the desired alarm value press the Trim Knob to confirm your selection The current value setting stops blinking 7 To exit the Service mode follow the instructions at the top of Page 16 How do I change the display time out duration for Non Invasive Blood Pressures 1 Navigate to Install Options Screen 2 2 Now rotate the Trim Knob to highlight the ...

Page 170: ... day DD month MMM and year YYYY 5 After the desired field is highlighted selected press the Trim Knob The current setting displays in blinking inverse video 6 Now rotate the Trim Knob to change the current date parameter setting 7 Once you set the desired value press the Trim Knob again to save the value The current value setting stops blinking 8 Repeat Step 4 through Step 7 for any other date par...

Page 171: ...corder completely From the On or MATERNAL ONLY state The yellow LED above the recorder is illuminated or flashing intermittently press the Record button and hold for 2 seconds until the monitor emits a two tone audio beep which indicates that the recorder is off The yellow LED is now extinguished How do I change the LOW PAPER NO PAPER alarm conditions 1 Enter the Install Options Screen 1 Rotate th...

Page 172: ...b to highlight the J102 softkey at the bottom of the display below the menu bar This opens the J102 screen The J102 connector is where HR and UA parameters are available as analog voltages at the rear panel of your monitor 4 The J102 screen is divided into five columns Pin Signal Range Voltage and Meaning Pin refers to the physical pinout of the connector Signal is the signal schematic designation...

Page 173: ...e the setting to On and press the Trim Knob again 6 The recorder should now begin to print two distinct calibration mechanisms Continuous calibration lines at the upper and lower limits of the heart rate and uterine activity scales This is to aid in the alignment of the print head assembly Approximately every 3 16 in a full line will print from end to end This is to test all print head elements an...

Page 174: ... the Trim Knob to highlight the desired baudrate selection on the desired communication port line 7 Press the Trim Knob The current setting displays in blinking inverse video 8 Now rotate the Trim Knob to change the current baudrate setting Select from one of the following 600 1200 2400 4800 9600 and 19200 9 When the desired test baudrate displays press the Trim Knob again to save The current valu...

Page 175: ...ptions Screen 1 256 and 259 models Install Options Screen 2 256 and 259 models Communications Setup 256 and 259 models Diagnostic Control 256 and 259 models 6 Wait until the printer stops and the display returns to the Install Options Screen 1 before you exit the Service mode 7 To exit the Service mode following the instructions at the top of Page 16 I have made the monitor configuration changes I...

Page 176: ...ch is open Off and the associated signal is enabled A 0 indicates the switch is closed On and the associated signal is disabled 4 The eight switches are defined as in the following table 5 On the line immediately below the dip switch settings the current configuration is interpreted as text information For instance when the dip switch settings indicate 11101100 the configuration line will read MEC...

Page 177: ...ffected If you are unable to find anything obvious or you are unable to verify the reported problem follow the step by step 250cx Series Service Troubleshooting PROBLEM SUBASSEMBLY COMMENTS VIDEO COMM BOARD WITH I O CONNECTORS Sits on same data bus as DSP Display board SYSTEM POWER SUPPLY INVERTOR If display is very dim INVERTOR TO LCD PANEL CABLE If display is very dim DSP TO INVERTOR CABLE Video...

Page 178: ...s on same data bus as DSP Display board FAN Secondary failure due to overheating only FECG FECG FRONT END CABLE CONNECTOR Usually Bad Connector Crimps ISOLATED POWER SUPPLY FRONT END MOTHERBOARD Passes all front end signals make sure boards seated no connector damage FECG UA BOARD DSP BOARD Processes FECG analog SYSTEM POWER SUPPLY MAIN BOARD Processes for display COMM BOARD WITH I O CONNECTORS Si...

Page 179: ...ing FECG UA BOARD Can affect board try removing SYSTEM POWER SUPPLY COMM BOARD WITH I O CONNECTORS Sits on same data bus as DSP Display board FAN Secondary failure due to overheating only MSpO2 MSpO2 FRONT PANEL CONNECTOR BOARD More likely internal cable MSpO2 MODULE FRONT END MOTHERBOARD Passes all front end signals make sure boards seated no connector damage ISOLATED POWER SUPPLY MSpO2 FRONT END...

Page 180: ...ed on US board FRONT END MOTHERBOARD Passes all front end signals make sure boards seated no connector damage SYSTEM POWER SUPPLY MAIN BOARD Processes for display COMM BOARD WITH I O CONNECTORS Sits on same data bus as DSP Display board FAN Secondary failure due to overheating only ULTRASOUND 2 ULTRASOUND BOARD If US1 heart rate is displayed on US2 cables swapped on US board DSP BOARD Processes US...

Page 181: ...if main boards thinks door is open RECORDER BOARD TO DOOR SWITCH CABLE Will not print if main boards thinks door is open SYSTEM POWER SUPPLY UI KEYPAD BOARD Would effect all buttons on front panel FAN Secondary failure due to overheating only PAPER ADVANCE DSP TO UI KEYPAD CABLE Affects all front panel functions RECORDER MOTOR Could have open winding or bad wire crimp in connector UI KEYPAD BOARD ...

Page 182: ...ting only RECORDER BUTTON RECORDER ON RECORDER BOARD TO MAIN BOARD CABLE UI KEYPAD BOARD Would affect all buttons on front panel RECORDER BOARD Drives the stepper motor DSP TO UI KEYPAD CABLE Affects all front panel functions RECORDER MOTOR Could have open winding or bad wire crimp in connector DOOR SWITCH Will not print if main boards thinks door is open MAIN BOARD Communicates with keypad SYSTEM...

Page 183: ...ER MOTOR Could have open winding or bad wire crimp in connector MAIN BOARD Communicates with keypad SYSTEM POWER SUPPLY DOOR SWITCH Will not print if main boards thinks door is open DSP BOARD Front panel keypad routed through DSP board FAN Secondary failure due to overheating only CHART LIGHT UI KEYPAD BOARD Would affect all buttons on front panel DSP TO UI KEYPAD CABLE Affects all front panel fun...

Page 184: ...oses Affects all front panel functions To front panel Pneumatics to main DSP TO UI KEYPAD CABLE Affects all front panel functions UI KEYPAD BOARD Would affect all buttons on front panel PNEUMATICS BOARD PUMP VALVES Pump valves hoses MAIN BOARD Communicates with keypad SYSTEM POWER SUPPLY DSP BOARD Front panel keypad routed through DSP board FAN Secondary failure due to overheating only MARK OFFSET...

Page 185: ... RECORDER BOARD Sensor Voltage Adjustment Drift RECORDER BOARD TO PAPER OUT SENSOR RECORDER BOARD TO MAIN BOARD CABLE MAIN BOARD FAN Secondary failure due to overheating only PAPER MISLOAD RECORDER BOARD TO PAPER MIS LOAD CABLE RECORDER BOARD Sensor Voltage Adjustment Drift RECORDER BOARD TO MAIN BOARD CABLE MAIN BOARD Processes this status from recorder board FAN Secondary failure due to overheat...

Page 186: ...n and off every second Recorder does not function the Record indicator is off the message PAPER INCORRECTLY LOADED RELOAD WITH BLACK SQUARES DOWN is shown in maternal waveform area Recorder does not function and the Record indicator is on Recorder is off out of paper or paper is incorrectly loaded Recorder is in maternal only mode Paper supply is low Paper loaded backwards Service required Press R...

Page 187: ... monitoring mode Replace transducer Rate on FHR area of display and FHR trend on strip chart paper do not correlate Paper Scale is incorrectly configured to either 50 210 bpm or 30 240 bpm Call Biomedical Engineering Department Table 17 FECG Troubleshooting Problem Probable Cause Possible Solution Internal FECG erratic or not recording properly Transducer not properly connected to monitor Attachme...

Page 188: ... Reference button while no pressure is applied to transducer button Re apply transducer Do not overtighten belt Press UA Reference button again between contractions Flashing sign Relative pressure 100 Press the UA Reference button between contractions CHECK TOCO message is shown in UA area of the display area when the UA Reference button is pressed UA Reference button pressed before UA circuits st...

Page 189: ...Fetus pressing directly on catheter Defective strain gauge or catheter Service required Flush catheter Re zero Replace catheter if necessary Reposition by twisting catheter Replace strain gauge or catheter Call Biomedical Engineering Department Table 20 MECG Troubleshooting Problem Probable cause Possible solution MECG erratic or not functioning properly Patient cable not properly connected to mon...

Page 190: ...IBP area of display Cuff pressure has exceeded the overpressure limit of 315 mmHg 15 mmHg Kinked hose Blocked hose Restrict patient limb movement If this is not the case contact Biomedical Engineering Department Check the external cuff for kinks Perform pneumatic test COMM message displayed in NIBP area of display Communication error between the built in NIBP module and the remainder of the monito...

Page 191: ...nsor Excessive maternal movement Excessive ambient light Damaged sensor Check patient The patient may be experiencing shock hypotension severe vasoconstriction severe anemia hypothermia arterial occlusion proximal to the sensor or cardiac arrest Ensure that the intermediate cable is firmly attached to the monitor and to the sensor assembly Ensure sensor is not too tight Move sensor to another loca...

Page 192: ...5 52 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Troubleshooting General Troubleshooting ...

Page 193: ...Revision C 250cx Series Maternal Fetal Monitor 6 1 2036947 001 6 Parts List Drawings and Replacement ...

Page 194: ...6 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 For your notes ...

Page 195: ...ver in special cases involving field installed upgrades the revision level of a diagram or parts list in this manual may not reflect the revision level of your unit s subassemblies When discrepancies are found contact your GE Medical Systems Information Technologies Service Representative NOTE Fab drawings are not contained in this manual Service Parts WARNING REPAIR TO THE FRU LEVEL Field repairs...

Page 196: ...ient cables N A 2025177 003 Speaker FRU 3 2025177 033 DSP Board FRU 6 2025177 007 Dual Ultrasound Board FRU 7 2025177 008 FECG UA w MECG Board FRU 7 2025177 009 Isolated Power Supply Board FRU 9 2025177 010 SpO2 Carrier Board w Nellcor Ox FRU 9 2025177 011 SpO2 Carrier Board w Masimo Ox FRU 9 2025177 012 SpO2 carrier Board w Ohmeda Ox FRU N A 2025177 020 Pneumatics Board FRU 2 2025177 029 MECG Boa...

Page 197: ... ship to FE Customers out of warranty may purchase 2 4 2025177 023 Keypad Volume Pad FRU 7 8 2025177 026 Trim Knob and Switch 1 2025177 017 Recorder Assembly w o Mnt Brkt FRU 25 2025177 018 Recorder Board FRU N A 2025177 002 Hardware Kit FRU Screws washers spacers for full monitor N A 2025177 031 Top Cover Gasket FRU Refer to Caution on page 6 31 Bubble Number Part Number Description Comments ...

Page 198: ...llowing FRU Main Reference Guide drawing The numbers in the bubbles coincide with the last three digits of the part number listed in the FRU list e g 020 represents FRU P N 2025177 020 To order Miscellaneous Cables HARDWARE KIT To order mounting hardware 016 003 033 020 018 017 032 023 026 022 034 035 027 013 036 028 006 037 030 English International 034 035 English International Card Cage ...

Page 199: ...cx Series Maternal Fetal Monitor 6 7 2036947 001 Parts List Drawings and Replacement Field Replaceable Units FRUs 010 029 007 009 011 012 008 SpO2 Carrier Bd w Nellcor SpO2 Carrier Bd w Masimo SpO2 Carrier Bd w Datex ...

Page 200: ...connect 8 conductor Inverter cable from DSP board connector J1 3 Disconnect 20 conductor DSP to LCD Decoder ribbon cable from DSP board connector J2 4 Disconnect 10 conductor DSP to Keypad ribbon cable from DSP board connector J5 5 Disconnect external display cable from J9 on DSP Display PWA 6 Remove DSP board from Main board 7 Remove two screws fastening Pneumatics assembly to chassis 8 Remove Pn...

Page 201: ... DSP board connector J2 29 Connect 10 conductor DSP to Keypad ribbon cable to DSP board connector J5 30 Place DSP board onto Main board Use two screws to fasten DSP board to chassis 31 Connect external display cable from J9 on the DSP Display PWA 2025177 005 DSP Board 1 Remove top cover Keep screws aside 2 Disconnect 8 conductor Inverter cable from DSP board connector J1 3 Disconnect 20 conductor ...

Page 202: ... screws into back of Power Supply 14 Fasten one pan head screw into inside bottom of Power Supply 15 Connect Power Supply cable to J1 connector on Recorder board 16 Connect Power Supply cable to J8 connector on Main board 17 Connect power switch cable to front bezel power switch chassis mounted connector 18 Adhere new cable tie mount to side of chassis 19 Use tie wrap to fasten power switch cable ...

Page 203: ...y remove from chassis 4 Disconnect 8 conductor Inverter cable from DSP board connector J1 5 Disconnect 20 conductor DSP to LCD Decoder ribbon cable from DSP board connector J2 6 Remove card cage cover Keep screws aside 7 If MECG is installed Disconnect MECG cable from MECG board connector 8 Remove MECG if installed and FECG board from Front end Motherboard 9 If MECG is installed Remove two screws ...

Page 204: ...d Use two screws to fasten DSP board to chassis 13 Place top cover Re insert screws 2025177 010 SpO2 Carrier Board with Nellcor MSpO2 Module 1 Remove top cover Keep screws aside 2 Remove two screws fastening DSP board to chassis 3 Remove DSP board from Main board 4 Disconnect 8 conductor Inverter cable from DSP board connector J1 5 Disconnect 20 conductor DSP to LCD Decoder ribbon cable from DSP b...

Page 205: ...nnect MSpO2 cable to SpO2 Carrier board connector J10 11 Replace card cage cover Re insert screws 12 Reconnect 8 conductor Inverter cable to DSP board connector J1 13 Reconnect 20 conductor DSP to LCD Decoder ribbon cable to DSP board connector J2 14 Place DSP board onto Main board Use two screws to fasten DSP board to chassis 15 Place top cover Re insert screws 2025177 012 SpO2 Carrier Board with...

Page 206: ...s from Ultrasound board connectors 8 Remove Ultrasound board from Front end Motherboard 9 Disconnect MSpO2 cable from SpO2 Carrier board connector 10 Remove SpO2 Carrier board assembly from Front end Motherboard 11 Disconnect MECG cable from MECG board connector 12 Remove MECG FECG board assembly from Front end Motherboard 13 Remove Isolated Power Supply board from Front end Motherboard 14 Remove ...

Page 207: ...US1 cable goes to the rear connector on Ultrasound board J5 39 Replace card cage cover Re insert screws 40 Connect 8 conductor Inverter cable to DSP board connector J1 41 Connect 20 conductor DSP to LCD Decoder ribbon cable to DSP board connector J2 42 Place DSP board onto board Use two screws to fasten DSP board to chassis 43 Place top cover Re insert screws 2025177 036 Chassis 1 Remove top cover...

Page 208: ...from Front end Motherboard 27 Remove five screws fastening the Front end Motherboard to the chassis 28 Remove Front end Motherboard 29 Disconnect 20 conductor Recorder ribbon cable from Main board connector J9 30 Disconnect power supply cable from J1 connector on Recorder board 31 Disconnect Recorder EMC ground wire Fast on tab from chassis 32 Remove four screws fastening Recorder assembly mountin...

Page 209: ... connector J10 62 Connect power supply cable to Main board connector J8 63 Place Comm board onto Main board 64 Fasten Comm board onto chassis with four screws 65 Place new Pneumatics assembly onto Main board 66 Insert two screws fastening Pneumatics assembly onto chassis 67 Connect clear section of tubing from E1 to PT1 on Main board 68 Connect clear section of tubing from E2 to PT2 on Main board ...

Page 210: ...nector US1 cable goes to the rear connector on Ultrasound board J5 93 Replace card cage cover Re insert screws 94 Tilt the front bezel back onto chassis Refasten screws to each side of chassis 95 Connect 10 conductor DSP to UI Keypad ribbon cable to DSP board connector J5 96 Connect 20 conductor DSP to LCD Decoder ribbon cable to DSP board connector J2 97 Connect 8 conductor Inverter cable to DSP ...

Page 211: ... Recorder assembly to mounting bracket Installing new Recorder Assembly 1 Fasten new Recorder assembly to mounting bracket with three screws 2 Fasten Recorder assembly and mounting bracket to chassis with four screws Do not fully tighten four screws as you will need to adjust later in the procedure 3 Connect Recorder EMC ground wire Fast on connector to chassis tab 4 Connect power supply cable to ...

Page 212: ...J5 and J6 9 Disconnect Recorder paper orientation sensor cable from Recorder board connector J8 10 Disconnect Recorder print head cable from Recorder board connector J3 11 Remove one screw fastening Recorder board to Recorder assembly 12 Remove Recorder board Installing new Recorder Board 1 Fasten new Recorder board to Recorder assembly with one screw 2 Connect Recorder print head cable to Recorde...

Page 213: ... 10 Disconnect 10 conductor Keypad to Volume ribbon cable from Volume board connector 11 Disconnect 20 conductor DSP to LCD Decoder ribbon cable from the opening in the back of the Display assembly 12 Connect replacement cable to LCD Decoder board through Display assembly opening Use either end of the cable The connector is keyed and will only mate the correct way 13 Using needle nose pliers disco...

Page 214: ...ard connector J5 7 Disconnect 20 conductor Recorder ribbon cable from Main board connector J9 8 Remove two screws on both sides of monitor fastening the front bezel to the chassis 9 Tilt the front bezel forward away from the chassis 10 Disconnect two red Pneumatics tubes from Front bezel NIBP connector 11 Pull red tubes through chassis grommet away from Front bezel 12 Remove two screws fastening P...

Page 215: ...r door as it will interfere with front bezel movement 9 Tilt the front bezel forward away from the chassis 10 Disconnect 10 conductor Keypad to Volume ribbon cable from Volume board connector 11 Remove screw fastening Display mounting bracket to front bezel 12 Remove screw fastening bracket to Display assembly 13 Remove four screws fastening Display assembly to front bezel 14 Remove Display assemb...

Page 216: ... MECG cable from MECG board connector 13 Remove MSpO2 cable beads from chassis bead clips 14 Remove MECG and FECG cable beads from chassis bead clips 15 Remove FECG ground cable from chassis post by removing nut 16 Disconnect FECG cable from Front end Motherboard 17 Disconnect IUP cable from Front end Motherboard 18 Disconnect two red Pneumatics tubes from Front bezel NIBP connector 19 Disconnect ...

Page 217: ...t bezel 47 Fasten Volume board and side keyboard pad to front bezel with four screws 48 Insert new Display lens 49 Insert new Display assembly Fasten to front bezel with four screws 50 Fasten bracket to Display assembly with screw 51 Fasten bracket to front bezel with screw 52 Connect 10 conductor Keypad to Volume ribbon cable to Volume board connector 53 Connect red tubes to Front bezel NIBP conn...

Page 218: ... Tilt the front bezel forward away from the chassis 9 Disconnect 10 conductor Keypad to Volume ribbon cable from Volume board connector 10 Remove screw fastening Display mounting bracket to front bezel 11 Remove screw fastening bracket to Display assembly 12 Remove four screws fastening Volume board and side keyboard pad to front bezel 13 Remove Volume board and side keyboard pad 14 Disconnect Enc...

Page 219: ... J1 5 Disconnect 20 conductor DSP to LCD Decoder ribbon cable from DSP board connector J2 6 Disconnect 10 conductor DSP to Keypad ribbon cable from DSP board connector J5 7 Disconnect external display cable from J9 on DSP Display PWA 8 Tilt the front bezel forward away from the chassis 9 Disconnect 10 conductor Keypad to Volume ribbon cable from Volume board connector 10 Disconnect Encoder cable f...

Page 220: ...play cable from J9 on DSP Display PWA 8 Tilt the front bezel forward away from the chassis 9 Disconnect power switch cable from power supply bulkhead mounted connector 10 Disconnect four Fast on tab connectors from power switch 11 Remove metal retaining clip from power switch 12 Push power switch out through front bezel 13 Connect power switch cable to power supply bulkhead mounted connector 14 Pu...

Page 221: ...ower switch cable from power supply bulkhead mounted connector 13 Remove power supply bulkhead mounted connector from chassis with needle nose pliers 14 Disconnect Power Supply cable from J1 connector on Recorder board Slide grommet out of bulkhead 15 Disconnect Power Supply cable from J8 connector on Main board Slide grommet out of bulkhead 16 Remove three flat head screws from side of Power Supp...

Page 222: ... 2025177 029 MECG Board 1 Remove top cover 2 Remove two screws fastening DSP board to chassis 3 Remove DSP board from Main board 4 Disconnect 8 conductor Inverter cable from DSP board connector J1 5 Disconnect 20 conductor DSP to LCD Decoder ribbon cable from DSP board connector J2 6 Disconnect external display cable from J9 on DSP Display PWA 7 Disconnect MECG cable from MECG board connector 8 Re...

Page 223: ...n the front edge of the gasket along the stamping line on the inside of the top cover and apply pressure to secure it Ensure the adhesive of the gasket is completely sealed all along the stamping line CAUTION The top cover gasket protects the inside of the unit from fluid spills Whenever the monitor cover is removed during servicing be sure to inspect the gasket ensuring it is attached securely ac...

Page 224: ...6 32 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Parts List Drawings and Replacement Assembly Disassembly of FRUs ...

Page 225: ...Revision C 250cx Series Maternal Fetal Monitor A 1 2036947 001 A Technical Specifications This section contains a detailed list of the technical specifications for the 250cx Series Monitor ...

Page 226: ...A 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Technical Specifications For your notes ...

Page 227: ...50 F to 104 F 10 C to 40 C 80 F 26 5 C 30 to 70 non condensing 45 to 65 non condensing 700 1060 mbar 525 795 mmHg 700 1060 mbar 525 795 mmHg Certification ANSI AAMI EC13 1992 UL 2601 1 CUL Complies with all areas except those listed below 3 1 2 1e Heart Rate Meter Accuracy and Response to Irregular Rhythm not tested 3 2 6 1 Range of QRS wave amplitude and duration 3 2 7 Range and accuracy of heart...

Page 228: ...cable 110 dB at mains frequency 10 µV peak to peak 10 MΩ 20 MΩ 40 dB 60 µA at 254 VAC electrically isolated 4 kVAC Ultrasound Mode Technique Transducer Type Pulse Repetition Frequency Single Ultrasound Mode Dual Ultrasound Mode Pulse Duration Transmitter Frequency Spatial Peak Temporal Average Intensity Spatial Average Temporal Average Intensity Focal 20 dB Beam Area Peak Instantaneous Intensity P...

Page 229: ...l Tachycardia Response Time Peak detecting beat to beat cardiotachometer Medtronic 1700 003 or equivalent I II and III 30 240 bpm 1 bpm 1 update per second 0 5 mV to 5 mV peak to peak 0 5 mV RTI 0 8 x QRS amplitude 2 seconds 3 seconds 10 seconds high alarm limit at 100 bpm 300 mVdc maximum 20 V peak to peak 0 6 to 40 Hz 80 dB at mains frequency with patient cable 50 dB at mains frequency 30 µV pea...

Page 230: ... time is exceeded not to exceed AAMI ANSI SP10 1992 limit of 180 s or safety timer detects microprocessor failure Auto mode minimum 30 second delay from the end of one determination to the beginning of another to allow for venous return Systolic diastolic and mean pressure pulse rate Alternating 1 5 second chimes Flashing pressure numeric or message User selectable high and low systolic diastolic ...

Page 231: ...Resolution Saturation SpO2 Pulse Rate bpm Low Perfusion Performance4 0 02 Pulse Amplitude and Transmission 5 Alarms Visual Audio Spectrophotometry and plethysmography LNOP DC I LNOP Adt LNCS PC I and LNCS Adt 30 kg 2 3 3 bpm 5 bpm 2 3 bpm 1 100 25 240 beats min 0 02 20 70 100 2 digits 70 100 3 digits 70 100 2 digits 0 69 unspecified 663 nm nominal 880 nm nominal 0 13 mW minimum 0 79 mW maximum 25 ...

Page 232: ...equals plus or minus one standard deviation Plus or minus one standard deviation encompasses 68 of the population Masimo SET technology with LNOP and LNCS sensors have been validated with human blood studies on healthy adult volunteers with induced hypoxia studies The volunteer population composed of both men and women spanned a range of skin pigmentations from light to dark and ranged in age from...

Page 233: ...ges ranged from 19 to 35 years old The weights ranged from 120 to 185 lb with a mean weight of 158 lb The skin tones were as follows 2 African American and Jamaican subjects with dark pigmentation 1 Asian subject with light yellow pigmentation 1 Hispanic subject and 1 Mexican subject with medium pigmentation and 8 Caucasian subjects with light to medium pigmentation OxyTip OXY AP sensor has been v...

Page 234: ...ertain environmental and patient physiological conditions as discussed in the operator s manual for the monitor Use Nellcor sensors only with 250cx Series Monitors containing Nellcor oximetry Consult individual manufacturers for accuracy specifications and compatibility information of particular instruments and Nellcor sensor models The volunteer population was composed of healthy men and women re...

Page 235: ...ternational 7 cm 8 cm 30 bpm cm 20 bpm cm 30 240 bpm 50 210 bpm 1 bpm 1 bpm Uterine Activity Scale Chart Width Scaling Range Resolution Strain Gauge Tocotransducer 4 cm 4 cm 25 mmHg 3 3 kPa cm 25 mmHg 3 3 kPa cm 0 100 mmHg 0 13 3 kPa 0 100 mmHg 0 13 3 kPa 1 mmHg kPa 1 mmHg kPa Maternal Pulse Oximetry MSpO2 Scale Chart Width Scaling Range Resolution Domestic International 4 cm 4 cm 12 5 cm or 25 cm...

Page 236: ...A 12 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Technical Specifications Strip Chart Recorder ...

Page 237: ...Revision C 250cx Series Maternal Fetal Monitor B 1 2036947 001 B Alarms Summary ...

Page 238: ...B 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Alarms Summary For your notes ...

Page 239: ...activates after 5 minutes a low alarm activates after 30 seconds About Latching Alarms The FHR limit alarms are latching alarms which means that a clinician must acknowledge the alarm using the monitor s Alarm Silence button in order to clear the alarm FHR numeric flashes Alternating high low tones if audio enabled Inadequate FHR signal quality Flashing dashes in place of FHR numeric Alternating h...

Page 240: ...message displays underneath Alternating high low tones if audio enabled 1 There is an MECG re alarm MSpO2 Alarm Defaults Audio on Volume 5 Limits High 100 Low 95 Re alarm 120 sec MSpO2 limit high or low actively being violated Issued after about 8 seconds MSpO2 numeric flashes MSpO2 value and pulse rate print on the strip chart Alternating high low tones if audio enabled Malfunction with MSpO2 cir...

Page 241: ...Revision C 250cx Series Maternal Fetal Monitor C 1 2036947 001 C Electromagnetic Compatibility ...

Page 242: ...C 2 250cx Series Maternal Fetal Monitor Revision C 2036947 001 Electromagnetic Compatibility For your notes ...

Page 243: ...ify normal operation in the configuration in which it is being used Guidance and Manufacturer s Declaration Electromagnetic Emissions The Corometrics 250cx Series Maternal Fetal Monitor is intended for use in the electromagnetic environment specified below It is the responsibility of the customer or user to assure that the 250cx Series Maternal Fetal Monitor is used in such an environment Emission...

Page 244: ...s Mains power should be that of a typical commercial or hospital environment 1 kV for input output lines 1 kV for input output lines Surge EN 61000 4 5 1 kV differential mode 1 kV differential mode Mains power should be that of a typical commercial or hospital environment 2 kV common mode 2 kV common mode 5 Ut 95 dip in Ut for 0 5 cycles 5 Ut 95 dip in Ut for 0 5 cycles Voltage dips short interrup...

Page 245: ...er manufacturer and d is the recommended separation distance in meters m Field strengths from fixed RF transmitters as determined by an electromagnetic site surveya should be less than the compliance level in each frequency rangeb Interference may occur in the vicinity of equipment marked with the following symbol NOTE 1 At 80 MHz and 800 MHz the higher frequency range applies NOTE 2 These guideli...

Page 246: ... as recommended below according to the maximum output power of the communications equipment For transmitters rated at a maximum output power not listed above the recommended separation distance d in meters m can be estimated using the equitation applicable to the frequency of the transmitter where P is the maximum output power rating of the transmitter in watts W according to the transmitter manuf...

Page 247: ...k Cable 3 Lead ECG Maternal AHA Rectangle 3 6 m 12 ft 1553BAO Multi Link Cable 3 Lead ECG Maternal IEC Rectangle 3 6 m 12 ft 1564AAO 120 Recorder Cable MECG 3 6 m 12 ft 1590AAO Qwik Connect Plus cable Round 2 4 m 8 ft 1591AAO Qwik Connect Plus FSE Cable Leg Plate Cable Rectangle 2 4 m 8 ft 412682 001 Leadwire set AHA Grabber N A 412682 003 Leadwire set IEC Grabber N A 7000AAO Fetal Spiral Electrod...

Page 248: ...DIS 3 6 m 12 ft 1558AAO 120 to QS Comm Cable 3 m 10 ft 1558AAO 120 to QS Comm Cable 3 m 10 ft 1558BAO 120 to QS Comm Cable 6 m 20 ft 1562AAO 120 Critikon Interface cable 0 3 m 1 ft 1562BAO 120 Critikon Interface cable 1 83m 6 ft 1563AAO 120 340 Interface cable 3 m 10 ft 1567AAO 120 Traceview Cable HP Mon to Traceview 120 3 m 10 ft 1568AAO 120 Traceview Adapter Cable 36m 1 ft 1569AAO 120 Peritronic...

Page 249: ...etic Compatibility EMC 2036641 001 Exergen TAT 5000 F 3 6m 12ft 2036641 002 Exergen TAT 5000 C 3 6m 12ft EX134203 Exergen TAT 5000 Probe Covers 1000 count EX134205 Exergen TAT 5000 Probe Covers 5000 count 2019194 081 ExtendaView Display Replacement only No repair parts Part No Description Maximum Lengths ...

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Summary of Contents for Corometrics 250cx Series

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Summary of Contents for Corometrics 250cx Series

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