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® N-3100 Blood Pressure Monitor To contact Nellcor Puritan Bennett’s representative: In the United States, call 1-800-NELLCOR or 510 463-4000; outside the United States, call your local Nellcor Puritan Bennett representative. Caution: Federal law (U.S.) restricts this device to sale by or on the order of a physician.
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02200 Espoo Finland Tel. +358.90.270.92.900 To obtain information about a warranty, if any, for this product, contact Nellcor Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative. NELLCOR SYMPHONY and the Nellcor knob configuration are trademarks of Nellcor...
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Table of Contents Section 5: Troubleshooting ................ Introduction................... How to Use this Section ............... Who Should Perform Repairs............Replacement Level Supported ............. Obtaining Replacement Parts ............Troubleshooting Guide ..............5.6.1 AC Power ................ 5.6.2 Error Codes ..............5.6.2.1 User-Correctable Error Codes ........5.6.2.2 Failure Error Codes............
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Table of Contents Technical Supplement ................Introduction................... Overview ..................Stackbus Interconnect ..............Circuit Analysis ................S4.1 Functional Overview ............S4.2 Detailed Circuit Analysis ..........S4.2.1 UIF/Power Supply Module ..........S4.2.2 Blood Pressure Module ........... S4.2.3 Display Board..............S-10 Schematic Diagrams ..............S-11 LIST OF FIGURES N-3100 Front Panel (North American) ..........
N-3100 Blood Pressure Monitor Description Related Documents MANUAL OVERVIEW This manual contains information for servicing the NELLCOR SYMPHONY N-3100 blood pressure monitor. Only qualified service personnel should service this product. Before servicing the N-3100, read the operator’s manual carefully for a thorough understanding of operation.
Refer to the N-3100 operator’s manual. To understand the various Nellcor Puritan Bennett cuffs and hose that work with the monitor, refer to the individual cuff and hose directions for use.
Verify that the monitor performs properly as described in paragraph 3.3. Perform the electrical safety tests detailed in paragraph 3.4. If the unit fails these electrical safety tests, do not attempt to repair, contact Nellcor Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative.
SECTION 3: PERFORMANCE VERIFICATION Introduction Equipment Needed Performance Tests Safety Tests INTRODUCTION This section discusses the tests used to verify performance of the monitor. All tests are accomplished through the control panel. EQUIPMENT NEEDED Equipment Description AC Power Adapter SPS-I or SPS-I1 (International) or SPS-N or SPS-N1 (North American) Electrical Safety Analyzer Must meet current AAMI...
Section 3: Performance Verification Observe the monitor front panel. With the N-3100 in STANDBY (turned off), press the ON/STANDBY button. In order to successfully complete the self-test, the monitor must perform the following sequence. The monitor emits three consecutively higher-pitched beeps. All indicators light momentarily as illustrated in Figure 3-1.
The following procedures use the N-3100 UP and DOWN ARROW buttons located on the top of the monitor. When the N-3100 is stacked with the N-3000, the N-3200, or both, the Nellcor knob on either of these units can be used to perform the function of the N-3100 UP and DOWN ARROW buttons.
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Section 3: Performance Verification From the normal mode steady state, press and release the UPPER ALARM LIMIT button. Press and hold the DOWN ARROW button until a value of “70.” is shown in the SYSTOLIC display. Note: A period (“.”) following a displayed alarm limit value is an indication that the alarm limit value has been changed from the power-on default value previously set in the N-3100.
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Section 3: Performance Verification 11. From the normal mode steady state, press and release the UPPER ALARM LIMIT button three times. Verify that the monitor emits a single beep each time you press the button. Verify that the MEAN/PULSE RATE display indicates an alarm limit value of “225” for a few seconds and verify that the other displays show dashes at the top while the “225”...
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Section 3: Performance Verification 21. Press the ON/STANDBY button to turn the monitor off. Verify that the monitor emits three consecutively lower-pitched beeps. 22. Press the ON/STANDBY button to turn the monitor on. The monitor performs the Power-On Self-Test described in 3.3.1.1, steps 3a. through 3g.
The following procedures use the N-3100 UP and DOWN ARROW buttons located on the top of the monitor. When the N-3100 is stacked with the N-3000, the Nellcor knob on this unit can be used to perform the function of the N-3100 UP and DOWN ARROW buttons.
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Section 3: Performance Verification From the normal mode steady state, press and release the LOWER ALARM LIMIT button. Within 3 seconds, press and hold the DOWN ARROW button until “40.” is displayed in the SYSTOLIC display. Verify that “40.” is the lowest value to which the lower alarm limit can be adjusted.
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Section 3: Performance Verification 14. From the normal mode steady state, press the LOWER ALARM LIMIT button three times. Within 3 seconds, press and hold the DOWN ARROW button until “35.” is displayed in the MEAN/PULSE RATE display. Verify that “35.” is the lowest value to which the lower alarm limit can be adjusted.
Section 3: Performance Verification 25. From the normal mode steady state, rapidly press the UPPER ALARM LIMIT button twice. Verify that the monitor emits two beeps and that the DIASTOLIC display indicates an alarm limit of “80” for a few seconds.
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Section 3: Performance Verification These tests can be performed individually (in any order) or sequentially. However, all of the tests must be performed to verify the pneumatic system functionality. Prior to performing any of these tests, perform the following setup procedure. If these tests are performed in sequence, this procedure needs to be performed once prior to the first test.
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Section 3: Performance Verification 3.3.2.2 Pneumatic Leakage—Adult The pneumatic leakage test verifies the integrity of the pneumatic system in the adult mode. Prior to performing this procedure, the setup procedure in paragraph 3.3.2 must be completed. Press the UP/DOWN ARROW buttons until menu item 33 is displayed in the SYSTOLIC display.
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Section 3: Performance Verification 3.3.2.4 Cuff Inflation Rate The cuff inflation rate test verifies the inflation rate of the N-3100. Prior to performing this procedure, the setup procedure in paragraph 3.3.2 must be completed. Press the UP/DOWN ARROW buttons until menu item “31” is displayed in the SYSTOLIC display.
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Section 3: Performance Verification Press the UP ARROW button to display menu item 32.3 in the SYSTOLIC display. The DIASTOLIC display indicates the rate in mmHg per second, to the nearest tenth, required to depressurize from 60 to 30 mmHg. A reading of 2.6–4.4 seconds indicates successful completion of the test.
Section 3: Performance Verification The test is complete when the pressure has increased, deflated, and the MANUAL indicator turns off. The SYSTOLIC display indicates menu item 36. A nonflashing DIASTOLIC display indicates the maximum pressure achieved. If the high-pressure relief valve does not open, the DIASTOLIC display flashes. A reading of 165 mmHg or less indicates successful completion of the test.
Section 3: Performance Verification 3.3.3.2 Pulse Rate Accuracy Test—Neonate This test verifies the functionality of the pulse rate detection in the neonate mode. Turn on the Bio-Tek simulator and press the MODE button three times to place it in the Tests mode. The simulator screen will indicate “Internal Cuff”...
Section 3: Performance Verification Connect the monitor’s AC plug to the analyzer as recommended in the analyzer operating instructions. Connect the analyzer resistance input lead to the equipotential terminal (grounding stud) on the external power supply. Verify that the analyzer indicates 150 milliohms or less.
Section 3: Performance Verification 3.4.2.2 Patient Leakage Current This test is in compliance with AAMI Standard ES1, paragraph 3.3.2 and IEC 601-1. Patient Leakage Current is measured between any individual patient connection and power (earth) ground. Configure the electrical safety analyzer as follows: Function: Patient Leakage µA...
Section 3: Performance Verification Connect the monitor AC plug to the electrical safety analyzer as recommended by the operating instructions for patient sink (leakage) current. Connect the electrical safety analyzer patient leakage input lead to the patient connector on the monitor's sensor input. The equipotential terminal is not connected to ground.
N-3100. When the N-3100 is stacked with the N-3000, the N-3200, or both, the Nellcor knob on either of these units can be used to perform the function of the N-3100 UP and DOWN ARROW buttons.
Section 4: Configuration and Service Modes Note: While changing limits, there must be some user interaction with the monitor within a 3-second period or the monitor returns to configuration mode steady state operation. Table 4-1 lists the default settings that can be configured and the respective buttons to press to access the settings.
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Section 4: Configuration and Service Modes 4.2.1 Adult-Pediatric/Neonatal Mode Default The operating mode that the monitor is in when you exit the configuration mode (adult-pediatric or neonatal), becomes the power-on default operating mode. 4.2.2 Systolic Upper Alarm Limit From configuration mode steady state, press the UPPER ALARM LIMIT button once.
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Section 4: Configuration and Service Modes 4.2.6 Mean Upper Alarm Limit From configuration mode steady state, press the UPPER ALARM LIMIT button three times. The current default value is displayed in the MEAN/PULSE RATE display. To change the upper alarm limit value, press and hold the UP or DOWN ARROW button on top of the monitor.
Section 4: Configuration and Service Modes 4.2.10 Alarm Volume Use the following procedure to adjust the alarm volume default: From the configuration mode steady state, press and hold the ALARM SILENCE button for approximately 3 seconds. A continuous tone at the current volume setting is emitted.
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Section 4: Configuration and Service Modes 4.2.13 Configuration Menu Entering the configuration menu steady state from the configuration mode steady state, allows you to view the UIF software version, enable/disable the measurement complete tone, or reset to factory power-on defaults. To return to the configuration mode steady state from the configuration menu steady state, while in the configuration mode steady state, press the LOWER ALARM LIMIT button.
Section 4: Configuration and Service Modes SERVICE MODE The service mode allows a service technician to select menu items that set up the N-3100 to perform tests that determine monitor functionality. The service mode also allows access to the error log report. Caution: Menu items 70 and above are for factory purposes only.
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Section 4: Configuration and Service Modes When you have scrolled to the desired menu item, press the UPPER ALARM LIMIT button. The PULSE RATE indicator lights. This indicates that you are now in a submenu level of the selected menu item.
Section 4: Configuration and Service Modes Table 4-2: Service Mode Menu Menu Type of Report/Test Software Version Report Lamp Test Mode Button Test Mode Speaker Test Mode Internal Configuration Code Report Total Operating Hours Report Error Log Record 1 Error Log Record 2 Error Log Record 3 Error Log Record 4 Error Log Record 5...
Section 4: Configuration and Service Modes 4.3.1 Menu Item 1: Software Version Report This report identifies the software versions of the UIF PCB and blood pressure module. From the service mode steady state, select menu item 1 by pressing the UP or DOWN ARROW buttons until “1”...
Section 4: Configuration and Service Modes Press each of the buttons and button combinations listed below. The corresponding number should appear in the DIASTOLIC display to indicate that these keys and key combinations are functioning correctly. Press the following button and/or Displayed button combinations: number:...
Section 4: Configuration and Service Modes Press the UP ARROW button. As the number in the DIASTOLIC display increases to a maximum of 254, the volume should correspondingly increase. Press the DOWN ARROW button to decrease the volume. Press the LOWER ALARM LIMIT button to return to the service mode steady state.
H in the last (far right) position. Verify that this number agrees with the number on the monitor’s external label. If the numbers do not agree, contact Nellcor Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative.
4.3.11 Menu Item 20: Reset to Factory Defaults This function allows the service technician to reset the monitor to the Nellcor factory default settings (see the Specifications section of this manual). From the service mode steady state, select menu item 20 by pressing the UP or DOWN ARROW buttons.
Section 4: Configuration and Service Modes 4.3.13 Menu Item 23: Enable/Disable Alarm Silence Reminder This function allows the service technician to disable or enable the Alarm Silence Reminder feature. From the service mode steady state, select menu item 23 by pressing the UP or DOWN ARROW buttons.
Section 4: Configuration and Service Modes Europe, the South Pacific and other parts of Asia, pressure calculation algorithm 2 (adjusted) is selected. The pressure calculation algorithm should be selected to be consistent with practices used in the country or institution where the N-3100 is to be used.
Section 4: Configuration and Service Modes Using the air bleed on the hand pump, manually depressurize the system, comparing the manometer readings to the N-3100 displayed values. Manually stop the test with the START/STOP button. Note: If the test is not manually stopped within 10 minutes, the N-3100 will automatically stop the test.
Section 4: Configuration and Service Modes At the end of the test cycle, the chamber depressurizes and the SYSTOLIC display indicates submenu item number 32.0. The DIASTOLIC display indicates the rate in mmHg per second, to the nearest tenth, required to depressurize from 260 to 180 mmHg. Using the UP ARROW button, go to menu item 32.1 in the SYSTOLIC display.
Section 4: Configuration and Service Modes Press and release the START/STOP button. The chamber begins to pressurize to approximately 150 mmHg. The current pressure reading will be displayed until the test is completed. Approximately four minutes later, the chamber will depressurize. The SYSTOLIC display indicates menu item “34.0.”...
Section 4: Configuration and Service Modes Press and release the START/STOP button. The chamber begins to pressurize to approximately 150 mmHg. The current chamber pressure in mmHg is displayed in the DIASTOLIC display. Manually increase the pressure until the pressure relief valve opens. This normally should happen before the pressure reaches 171 mmHg.
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Section 4: Configuration and Service Modes 11. The first two digits of the DIASTOLIC display will be the fifth byte of the version in hexadecimal format. The third digit will be “H.” The first two digits of the MEAN/PULSE RATE display will be the sixth byte of the version in hexadecimal format.
OBTAINING REPLACEMENT PARTS Nellcor Puritan Bennett Technical Services provides technical assistance information and replacement parts. To obtain replacement parts, contact Nellcor Puritan Bennett. Refer to parts by the part names and part numbers listed in Section 7, Spare Parts. 5- 1...
Taking the recommended actions discussed in this section will correct the majority of problems you will encounter. However, problems not covered here can be resolved by contacting Nellcor Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative...
Section 5: Troubleshooting 5.6.1 AC Power Most AC power problems result in one of two symptoms. Either there is no response when the ON/STANDBY button is pressed, or the microprocessor failure alarm sounds. If the microprocessor failure alarm sounds and an error code is displayed, refer to paragraph 5.6.2.
Section 5: Troubleshooting 5.6.2 Error Codes When there is a problem within the N-3100 monitor, an error code may be displayed on the front panel, as illustrated: mmHg mmHg These codes correspond to messages that indicate what part of the monitor is at fault.
Section 5: Troubleshooting Table 5-3: N-3100 User-Correctable Error Codes (Cont.) The N -3100 has received Let the current operation proceed. more button pushes than it can retain while it processes the current operation. Blood pressure test failed. Check cuff connections. Check cuff This code only displayed in application and orientation.
2. Verify compatibility of software as discussed in Section 4, Configuration and Service Modes (paragraph 4.3.15, menu item 29). 3. If the error code still appears, verify compatibility of the ROMs by calling Nellcor Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative.
Section 5: Troubleshooting 5.6.5 Operational Performance Table 5-7 lists symptoms of problems relating to operational performance (no error codes displayed) and recommended actions. If the action requires replacement of a PCB or module, refer to Section 6, Disassembly Guide. Table 5-7: Operational Performance Problems Condition Recommended Action 1.
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Section 5: Troubleshooting Table 5-8: Stack Problems (Cont.) 1. Ensure that a good docking connection 3. BATTERY IN USE/ exists between the N-3000 and N-3100. BATTERY LOW indicators on the N-3000 2. Check the N-3000 fuse. Replace if light steadily but do not necessary as indicated in the Disassembly on the N-3100 and Guide section of the N-3000 service...
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N-3000 N-3100. After ensuring that a good docking stacked with the N-3100 connection exists, contact Nellcor Puritan have no effect on the Bennett’s Technical Services Department or N-3100. your local Nellcor Puritant Bennett representative for information on retrofitting the N-3000.
SECTION 6: DISASSEMBLY GUIDE Introduction Fuse Replacement Monitor Disassembly Lithium Battery Replacement Reassembly INTRODUCTION The N -3100 can be disassembled down to all major component parts, including: • PCBs • lithium batteries • cables • function keys • chassis enclosures Tools required for disassembly: •...
Section 6: Disassembly Guide Fuse F1, 0.8 amp Figure 6-1: Fuse Replacement Replace the fuse, as illustrated above, with one of same value and rating (0.8 amp, 250 volt). Replace the bottom cover. MONITOR DISASSEMBLY Place the N-3100 in the standby mode by pressing the ON/STANDBY button.
Section 6: Disassembly Guide Separate the bottom enclosure from the top half of the monitor, keeping the right side panel attached to the bottom enclosure and the left side panel attached to the top. Disconnect the blood pressure module ribbon connector from the UIF board as illustrated in Figure 6-3.
Section 6: Disassembly Guide 6.3.2 Replacing the Monitor Speaker To replace the monitor speaker: Disconnect the lower docking connector ribbon from the UIF board by depressing the bar at the top of the connector on the UIF board and carefully pulling on the ribbon cable. Disconnect the speaker connector from the UIF board.
Section 6: Disassembly Guide 6.3.3 Replacing the Hose Fitting To replace the hose fitting: Perform step 1 in paragraph 6.3.2. Disconnect the pump hose from the fitting on the side panel. Loosen and remove the retaining nut. Pull fitting out of the side-panel molded housing. Install the new fitting, applying LocTite (removable thread locker 242) or equivalent on the hose fitting and retaining nut, as illustrated in Figure 6-4.
Section 6: Disassembly Guide To remove the display panel front lens, loosen the five screws securing the UIF board first, then lift the cover up and away from the chassis. Rear panel Lithium batteries UIF board Display board Front lens Top docking Top enclosure Button set...
Section 6: Disassembly Guide 6.3.5 Removing the Pump Module To remove the pump module: Remove the four screws securing the module to the bottom enclosure, as shown in Figure 6-6. Pump bracket Pump assembly Blood pressure PCB Lower docking connector Bottom enclosure Figure 6-6: Removing Pump Module 6- 7...
Slide the batteries from underneath the spring clips. Do not dispose of lithium batteries by placing them in the regular trash. Dispose of properly or return them to Nellcor Puritan Bennet’s Technical Services Department for disposal. Replace batteries, observing correct polarity (positive terminal up).
Section 6: Disassembly Guide Figure 6-7: Installing the Handle Depending upon the level of repairs, you may have to reconfigure the monitor’s Internal Configuration Code (ICC) in order to get the monitor to operate properly. Reconfiguration is performed using menu item 20 of the service mode.
SECTION 7: SPARE PARTS Introduction INTRODUCTION Spare parts, along with corresponding part numbers, are shown below. Numbers in parentheses correspond to the callouts in Figure 7-1. Item Part Number Number Blood pressure module ribbon cable 030375 Lower docking connector PCB 031773 Fuse 691122...
GENERAL INSTRUCTIONS Pack the monitor carefully. Failure to follow the instructions in this section may result in loss or damage not covered by the Nellcor Puritan Bennett warranty. If the original shipping carton is not available, use another suitable carton. North American customers may call Nellcor Puritan Bennett’s Technical Services Department to obtain a shipping carton.
Section 8: Packing for Shipment REPACKING IN ORIGINAL CARTON If available, use the original carton and packing materials as illustrated in Figure 8-1. Figure 8-1: Repacking the N-3100 Place the monitor and, if necessary, accessory items in the original packaging. Note: Additional packing materials will be needed around loose accessory items.
Section 8: Packing for Shipment REPACKING IN A DIFFERENT CARTON If the original carton is not available: Place the monitor in a plastic bag. Use a corrugated cardboard shipping carton with at least 200 pounds per square inch (psi) bursting strength. Fill the bottom of the carton with at least 2 inches of packing material.
ISO 9919, RFE per VFG 243, EMC per IEC 801 series and per CISPR 11, Class A and VDE 0871, Class B (Vfg. 243/1991). The NELLCOR SYMPHONY N-3100 blood pressure monitor adheres to ANSI/AAMI Standard SP10-1992, Standards for Electronic Automated Sphygmomanometers when tested in the supine position.
APPENDIX Integrity Tests Error Types User-Correctable Error Codes Failure Error Codes Internally Corrected Error Codes INTEGRITY TESTS The N -3100 routinely performs internal system integrity tests to verify and monitor proper operation. As a result, error codes are recorded in the internal Error Log and codes may be displayed on the monitor front-panel display.
Appendix ERROR TYPES There are six classes of errors in the N-3100 as indicated in Table A-1. Table A-1: Error Types Error Type Description 1. Generic POST/ In this case, nothing may happen, or a shrill microprocessor continuous alarm may sound and the display may failure.
Appendix Table A-1: Error Types (Cont.) Error Type Description 5. User-correctable error. An EEE0xx code representing the failure is displayed and a low-priority alarm sound is produced, but no entry is made in the Error Log. These types of errors represent hardware failure conditions that can be corrected by the user, such as replacing a faulty cuff or unkinking the hose.
Appendix User-correctable error codes (cont.) Blood pressure test failed, displayed only in service mode Blood pressure test failed, displayed only in service mode Communication failure with the pump assembly, displayed only in service mode FAILURE ERROR CODES Table A-2 lists the possible failure error codes in numerical order. Table A-2: N-3100 Failure Error Codes Error Code Explanation Blood pressure module failed startup tests...
Error Log. However, if you find it necessary to contact Nellcor Puritan Bennett’s Technical Services Department or your local Nellcor Puritan Bennett representative, they may request information from the Error Log. Table A-3: N-3100 Internally Corrected Error Codes...
TECHNICAL SUPPLEMENT Introduction Overview Stackbus Interconnect Circuit Analysis Schematic Diagrams INTRODUCTION This Technical Supplement provides the reader with a summary of the N-3100 operating principles and an in-depth discussion of N-3100 circuits. A functional overview and detailed circuit analysis are supported by block and schematic diagrams.
Technical Supplement Systolic Pressure Mean Pressure Diastolic Pressure Time Cuff Linear Bleed Period Pressure Inflation Release Period Pressure Stabilization Figure S2-1: Oscillatory Blood Pressure Measurement STACKBUS INTERCONNECT Stackbus is the general term for the communication interconnect between the N-3000 and the N-3100 instruments. The internal communication bus is used for communications between the UIF/Power Supply PCB and the Blood Pressure module.
Technical Supplement All stations participate in the loop when stacked and turned on. Maintenance of token passing, loop initialization, lost token recovery, and the addition of new stations is implemented in the N-3000’s UIF/Gateway and SpO modules and in the N-3100 by the Arcnet. CIRCUIT ANALYSIS This section provides a descriptive overview of the N-3100 modular design, as well as a detailed circuit analysis.
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Technical Supplement N3100 NIBP Measurement Module (Colin BPM1500) Dump Valve Sense Cuff Bleed Watchdog Valve Pump Pressure Sensor Stet Measurement Pressure Sensor Power Conditioning 10.5 +5 +6 Serial Communications Link UIF Board On/Stby Patient Power Batt Bus Management Button Circuitry External Serial Watchdog...
Technical Supplement S4.2 DETAILED CIRCUIT ANALYSIS The following paragraphs discuss the operation of each of the printed circuit boards within the N-3100 blood pressure monitor. (Refer to the appropriate schematic diagram at the end of this appendix, as necessary.) S4.2.1 UIF/Power Supply Module The UIF module, located on the UIF/Power Supply PCB, provides power to the other modules within the N-3100 and controls communication between each module.
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Technical Supplement The QSM allows the real-time clock to communicate to the QSM by connecting the MISO and MOSI lines. The signals from the QSM are tied to the 5-volt power supply through resistors. The SCI submodule communicates with the blood pressure module in an EIA -232 format at the 5-volt level.
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Technical Supplement Watchdog Timer — U21 ensures that the U3 microprocessor does not operate when the +5 volt supply falls below 4.5 volts minimum. This chip holds U3 in reset until the power supply is back within an acceptable range of voltage levels.
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Technical Supplement S4.2.1.4 Speaker Driver and Volume Control As illustrated in Figure S4-3, speaker tones originate from the U3 GPT output compare-pin (OC2). The GPT pin outputs a square wave whose frequency is under software control. This signal is buffered by U6, then input into DAC U5.
Technical Supplement J5 — contains power and signal lines used in the stack configuration to communicate with the N-3000. These signal lines include the battery bus, charge bus, digital and case ground, and the external Stackbus. Table S4-2: J5 Upper Inter-Stack Connector Input/Output/ Pin No.
Technical Supplement When the start command from the UIF is received, the Blood Pressure module closes the bleed/dump valve and drives the pump to increase the cuff pressure to the preset value. The cuff is deflated by the opening of the bleed valve to measure the blood pressure.
Technical Supplement There are 11 buttons on the display panel: the ON/STANDBY button (SW1) and the AUDIBLE ALARM OFF button (SW2) are connected directly to the UIF/Power Supply module. All the buttons except the ON/STANDBY button are connected to an input matrix of PIC microprocessor U3. The PIC is responsible for communicating with the UIF.
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