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VIASYS Bear Cub 750PSV Service Manual

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Service Manual
Bear Cub 750PSV
© Copyright 2004, VIASYS Healthcare Critical Care
L2346
Revision B
June 2004

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Summary of Contents for VIASYS Bear Cub 750PSV

  • Page 1 Service Manual Bear Cub 750PSV © Copyright 2004, VIASYS Healthcare Critical Care L2346 Revision B June 2004...

  • Page 2: Revision History

    Bear Cub 750PSV Revision History Date Revision Pages Changes June 2003 Release June 2004 Release manual in VIASYS Healthcare template using VIASYS Healthcare Critical Care nomenclature. L2346 Revision B June 2004...

  • Page 3: Contact And Ordering Information

    Service Manual Contact and Ordering Information United States, Latin America, Asia Pacific: Sales, Service and Clinical Support: VIASYS Healthcare Critical Care Division 22705 Savi Ranch Parkway Yorba Linda, CA 92887 Phone: (714) 283-8444 (800) 381-3552 Fax: (714) 283-8493 www.VIASYShc.com United Kingdom:...
  • Page 4 Federal law (USA) restricts this device to sale by or on the order of a physician. CAUTION Not suitable for use in the presence of flammable anesthetics. CAUTION Service and/or repair of this instrument is restricted to VIASYS Healthcare authorized or VIASYS Healthcare Trained Personnel only. L2346 Revision B...

  • Page 5: Warranty

    Service Manual Warranty The Bear Cub 750PSV is warranted to be free from defects in material and workmanship and to meet the published specifications for One (1) year from date of shipminent. The liability of VIASYS Healthcare, Critical Care Division, (referred to as the...
  • Page 6 Bear Cub 750PSV L2346 Revision B June 2004...

  • Page 7: Table Of Contents

    Service Manual Contents Revision History ..................2 Contact and Ordering Information ................3 Warranty ......................... 5 Limitation of Liabilities....................5 Contents ......................... 7 List of Figures ........................ 9 List of Tables........................ 11 Chapter 1: Specifications ..............13 Modes..........................13 Controls ........................13 Alarms...........................
  • Page 8 Bear Cub 750PSV Chapter 3 OVP Recommended Service ........... 29 Operational Verification ....................29 Equipment Required....................29 Test Procedures......................32 Exterior Inspection and Cleaning................34 Exterior Cleaning ......................34 Plugs and Cables ......................34 OVP Checklist ......................35 Verification Steps......................35 Chapter 4 Calibration (for software releases 2 and 3 only)...

  • Page 9: List Of Figures

    Figure 2-1: Top Level Block Diagram ..........23 Figure 2-2: Pneumatics System Schematic ........24 Figure 3-1: Bear Cub 750PSV US with Patient Circuit ....33 Figure 5-1: Power Supply Module Assembly (1 of 2) ...... 45 Figure 5-2: Power Supply Module Assembly (2 of 2) ....... 46 Figure 5-3: Schematic Diagram, Pneumatic 750PSV .......
  • Page 10 Figure 5-20: Display Schematic PCB (2 of 4)........64 Figure 5-21: Display Schematic PCB (3 of 4)........65 Figure 5-22: Display Schematic PCB (4 of 4)........66 Figure 5-23: BEAR CUB 750PSV Overlay (P/N 51-09640-00)... 67 Figure 6-1: Troubleshooting Decision Tree ........69 Figure 7-1: Cover Removal..............73 Figure 7-2: Standoff Tube Removal...........

  • Page 11: List Of Tables

    Service Manual List of Tables Table 3-1: Standard Settings ............. 30 Table 3-2: Rate ..................30 Table 3-3: Exhalation Time and I/E Ratio Table ....... 30 Table 4-1: Control PCB Transducer Calibration ......38 Table 4-2: Calibration ................. 39 Table 4-3: Diagnostic Function ............40 Table 4-4: Inspiratory Flow Calibration ..........
  • Page 12 Bear Cub 750PSV L2346 Revision B June 2004...

  • Page 13: Chapter 1: Specifications

    Service Manual Chapter 1: Specifications Modes In the Assist/Control position, a mechanical breath is delivered with each inspiratory effort, provided the patient satisfies the assist sensitivity criteria. If the patient does not meet the assist sensitivity criteria, the ventilator automaticallydelivers breaths according to the Ventilator Rate control.
  • Page 14 Bear Cub 750PSV Inspiratory Time Range: 0.10 to 3.0 seconds Resolution: 0.01 from 0.10 to 0.50 seconds 0.02 from 0.50 to 1.70 seconds 0.05 from 1.70 to 3.00 seconds Accuracy: ± 0.02 seconds from 0.10 to 0.50 seconds ± 0.025 seconds from 0.50 to 3.00 seconds...

  • Page 15: Alarms

    Service Manual Inspiratory Pressure Range: 0 to 72 cmH2O Resolution: 1 cmH2O from 0 to 30 cmH2O 2 cmH2O from 30 to 72 cmH2O Repeatability: ± 1 cmH2O or ± 5% whichever is greater. Breath to breath Manual Breath Range: Assist Sensitivity Range: 0.2 to 5.0 L/min...
  • Page 16 Bear Cub 750PSV Low Inspiratory Pressure Range: 1 to 65 cmH2O Patient Circuit LED On/Off Failed to Cycle LEd On/Off Low Gas Supply LED On/Off Apnea LED On/Off Settings Incompatible LED On/Off Pressure Settings Incompatible LED On/Off Prolonged Inspiratory Pressure...

  • Page 17: Monitors

    Service Manual Line Power Green/Red LED Monitors Total Breath Rate Range: 0 to 255 BPM Resolution: 1 BPM from 0 to 100 BPM 2 BPM from 100 to 150 BPM 3 BPM from 150 to 255 BPM Exhalation Minute Volume Range: 0 to 30.0 L/min resolution:...
  • Page 18 Bear Cub 750PSV Expiratory Time Range: 0 to 99.9 seconds Resolution: 0.01 seconds from 0 to 99.9 seconds 0.10 seconds from 10.0 to 99.9 seconds Accuracy: ± 0.02 seconds I:E Ratio Range: 9.9:1 to 1:9.9 Accuracy: ± 0.1 or ± 20 mseconds, whichever is greater...

  • Page 19: Preset Values

    Service Manual Breath Type (Patient Initiated) Test Push Button Battery LED On/Off Preset Values Minimum Expiratory Time 150 milliseconds Maximum Inspiratory Time 3.10 seconds Maximum settable I:E Ratio Model 9300 Classification Class 1 Degree of Protection Electric Shock Type B Harmful Ingress of Water None (Ordinary Equipment) Degree of Safety of Application...

  • Page 20: Inputs

    Bear Cub 750PSV Proximal Inspiratory/Expiratory Flow -40 (expiratory) to 40 (inspiratory) L/min, 1 L/min/50 mv Breath Phase 1 “Logic” signal; 0, 5V Remote Nurse Call 0.5 amps max at 24 vdc max Pneumatic Auxiliary Blended Gas Outlet 7 to 17 psig, 0 to 8 L/min...

  • Page 21: Environmental Specifications

    Service Manual Ventilator Dimensions 13.5" W x 10" D x 11" H Graphics Display Dimensions 13" W x 2.5" D x 9.5" H Pedestal Stand Dimensions 24" x 40.5" H Compressor Dimensions 22"W x 21.5"D x 36" H Shipping Weight Including Ventilator 38 lbs.

  • Page 22: Cleaning

    Bear Cub 750PSV Cleaning External Surfaces All external surfaces of the ventilator shall be able to be wiped clean with the following compounds: Isopropyl Alcohol Chlorine Compounds Maximum Concentration: 1:10 Quaternary Ammonium Compounds Maximum Concentration: 1:500 NOTE These compounds are diluted by volume in water.

  • Page 23: Chapter 2: Theory Of Operation

    Service Manual Chapter 2: Theory of Operation Overview This chapter describes the operating theory of the BEAR CUB™ 750PSV Infant Ventilator. The BEAR CUB™ 750PSV ventilator can be classified as a micro- processor controlled, time cycled, pressure limited, dual flow, neonatal/pediatric critical care ventilator.

  • Page 24: Figure 2-2: Pneumatics System Schematic

    Bear Cub 750PSV Figure 2-2: Pneumatics System Schematic L2346 Revision B June 2004...

  • Page 25: Ventilator Pneumatics - General Description

    Service Manual Ventilator pneumatics - General description Figure 2-2 shows the schematic diagram of the BEAR CUB™ 750PSV Pneumatics System. The pneumatics interface to the electronics is achieved using various actuators (solenoids) and transducers. The Pneumatics System consists of eight (8) main subsystems: Gas Inlet and Conditioning, Oxygen Blender System, Flow Control, Sub-Ambient/Overpressure Relief system, Exhalation Valve/Pressure Control, Pressure Monitoring, the Proximal Airway Purge System, and the Auxiliary...

  • Page 26: Aopr Valve/Sub-Ambient Valve/ Dump Solenoid

    Bear Cub 750PSV NOTE The Inspiratory Flow and Base Flow displayed on the Front Panel are independent of the flow readings taken by the flow sensor. AOPR Valve/Sub-Ambient Valve/ Dump Solenoid Maximum pressure to the patient can be limited using the Adjustable/Over Pressure Relief valve.

  • Page 27: Exhalation Valve

    Service Manual Exhalation Valve The Exhalation Valve regulates flow out of the patient circuit. Exhaled patient gases flow through the expiratory leg of the patient circuit, past the Exhalation Valve diaphragm and seat, and out to the atmosphere. The Exhalation Valve is a pneumatic servo controlled regulator.

  • Page 28: Power Supply

    Bear Cub 750PSV The Display circuit board is the user interface for the ventilator electronics. Ventilator controls and alarms are set by the clinician, and Monitors feed current ventilator status back to the display. The Control circuit board includes the Monitor MCU and Control MCU. The Control board drives the system solenoids which control breath phase, flow, and pressure.

  • Page 29: Chapter 3 Ovp Recommended Service

    P/N 50000-01147 Oxygen Analyzer Rubber Stopper Stop Watch CAUTION If any of the following procedures fail to producer the results as outlined in this document, disconnect the ventilator and contact your authorized VIASYS Healthcare service technician. L2346 Revision B June 2004...

  • Page 30: Table 3-1: Standard Settings

    Bear Cub 750PSV Table 3-1: Standard Settings Mode SIMV Rate 30 BPM Inspiratory Pressure 40 cmH2O Inspiratory Flow 15 L/min PEEP/CPAP 0 cmH2O Inspiratory Time 0.8 seconds Base Flow 5 L/min Assist Sensitivity Apnea 10 seconds Low PEEP/CPAP Alarm -3 cmH2O Volume Limit™...
  • Page 31 Service Manual WARNINGS The following warnings must be read and understood before performing the procedures described in this chapter. • Under no circumstances should this medical device be operated in the presence of flammable anesthetics or other volatile materials due to a possible explosion hazard.

  • Page 32: Test Procedures

    Bear Cub 750PSV correct values. This certification procedure should be performed at least once every six months. More frequent certification may be required based on usage and environment. Test Procedures Set up the ventilator with a standard infant test circuit. Plug the end of circuit with rubber stopper.

  • Page 33: Figure 3-1: Bear Cub 750Psv Us With Patient Circuit

    Low Inspiratory Pressure alarms are activated. Verify that the Alarm Loudness can be varied from minimum to maximum, but the alarm cannot be turned off. Figure 3-1: Bear Cub 750PSV US with Patient Circuit L2346 Revision B June 2004...

  • Page 34: Exterior Inspection And Cleaning

    Bear Cub 750PSV Exterior Inspection and Cleaning Inspect all cords, connectors, and fittings. Inspect the case for any cracks or other damage. Exterior Cleaning Before any cleaning of the ventilator, disconnect WALL AC. Clean the exterior of the ventilator with an appropriate bactericidal or germicidal agent.

  • Page 35: Ovp Checklist

    Do not release the ventilator for use if it does not pass all of the verification procedures specified in the checklist. To do so could result in personal injury including death or property damage. Refer the ventilator to a VIASYS trained service technician for appropriate repair and/or calibration.
  • Page 36 Bear Cub 750PSV L2346 Revision B June 2004...

  • Page 37: Chapter 4 Calibration (For Software Releases 2 And 3 Only)

    Service Manual Chapter 4 Calibration (for software releases 2 and 3 only) Introduction The information in this chapter is intended for use by a factory trained service technician. Before opening the console or removing assemblies to perform calibration, a reference should be made to the Operators Manual and all chapters of this Service Manual to ensure that the ventilator is being properly utilized.

  • Page 38: Pressure Transducers And Flow Control Valve Calibration

    NOTE If problems are incurred in obtaining the calibration performance, refer to Troubleshooting (Chapter 6) or contact your dealer or VIASYS Healthcare Service Facility. Pressure Transducers and Flow Control Valve Calibration Turn OFF the ventilator and disconnect tubing to the Pressure Transducers on the Control PCB.

  • Page 39: Table 4-2: Calibration

    Service Manual PATIENT port. To calibrate the Flow Control Valve, press the TEST key to advance the calibration number; then set flow as specified and press the MANUAL BREATH key to record data. Calibrate Base Flow, then Calibrate Inspiratory Flow. Table 4-2: Calibration Transducer Calibration Number...

  • Page 40: Table 4-3: Diagnostic Function

    Bear Cub 750PSV Table 4-3: Diagnostic Function NUMBER FUNCTION Calibrate pmach @ 0 cmH Calibrate pmach @ 40 cmH Calibrate pdelta @ 0 cmH Calibrate pdelta @ 40 cmH Calibrate proxp @ 0 cmH Calibrate proxp @ 40 cmH Calibrate O2p...

  • Page 41: Air And O 2 Regulator Balance

    Service Manual Table 4-4: Inspiratory Flow Calibration Flow Flow Flow Flow Flow Flow Flow Flow Flow Sea Level 500 feet 1000 feet 1500 feet 2000 feet 2500 feet 3000 feet 3500 feet 4000 feet 2.00± .02 2.02± .02 2.04± .02 2.05±...

  • Page 42: Table 4-5: Regulator Balance

    Bear Cub 750PSV Table 4-5: Regulator Balance Blender Component Requirement Setting Air Regulator 100% 17.0 ± 1 psig Adjust O regulator to obtain a Regulator pressure balance with the air regulator within 2 cmH With Base Flow Control Valve set to minimum, Bleed Valve Bleed Valve exhaust shall equal 3.5 - 5.5...

  • Page 43: Table 4-6: Standard Test Settings

    Service Manual Table 4-6: Standard Test Settings CONTROLS Mode Assist/Control PEEP/CPAP Pressure 0 cmH2O Inspiratory Pressure (PIP) 20 cmH2O Ventilator Rate 30 BPM Inspiratory Time 1.00 second Volume Limit 300 mL Base Flow 5 L/min Inspiratory Flow 15 L/min Assist Sensitivity Mid Range ALARMS Low PEEP/CPAP Alarm...
  • Page 44 Bear Cub 750PSV L2346 Revision B June 2004...

  • Page 45: Chapter 5 Schematics And Assemblies

    Service Manual Chapter 5 Schematics and Assemblies Figure 5-1: Power Supply Module Assembly (1 of 2) L2346 Revision B June 2004...

  • Page 46: Figure 5-2: Power Supply Module Assembly (2 Of 2)

    Bear Cub 750PSV Figure 5-2: Power Supply Module Assembly (2 of 2) L2346 Revision B June 2004...

  • Page 47: Figure 5-3: Schematic Diagram, Pneumatic 750Psv

    Service Manual Figure 5-3: Schematic Diagram, Pneumatic 750PSV L2346 Revision B June 2004...

  • Page 48: Figure 5-4: Power Supply Pcb Assembly (1 Of 3)

    Bear Cub 750PSV Figure 5-4: Power Supply PCB Assembly (1 of 3) L2346 Revision B June 2004...

  • Page 49: Figure 5-5: Power Supply Pcb Assembly (2 Of 3)

    Service Manual Figure 5-5: Power Supply PCB Assembly (2 of 3) L2346 Revision B June 2004...

  • Page 50: Figure 5-6: Power Supply Pcb Assembly (3 Of 3)

    Bear Cub 750PSV Figure 5-6: Power Supply PCB Assembly (3 of 3) L2346 Revision B June 2004...

  • Page 51: Figure 5-7: Pneumatic Tubing Diagram

    Service Manual Figure 5-7: Pneumatic Tubing Diagram L2346 Revision B June 2004...

  • Page 52: Figure 5-8: Display Pcb (1 Of 3)

    Bear Cub 750PSV Figure 5-8: Display PCB (1 of 3) L2346 Revision B June 2004...

  • Page 53: Figure 5-9: Display Pcb (2 Of 3)

    Service Manual Figure 5-9: Display PCB (2 of 3) L2346 Revision B June 2004...

  • Page 54: Figure 5-10: Display Pcb (3 Of 3)

    Bear Cub 750PSV Figure 5-10: Display PCB (3 of 3) L2346 Revision B June 2004...

  • Page 55: Figure 5-11: Control Pcb Assembly

    Service Manual Figure 5-11: Control PCB Assembly L2346 Revision B June 2004...

  • Page 56: Figure 5-12: Wiring Diagram

    Bear Cub 750PSV Figure 5-12: Wiring Diagram L2346 Revision B June 2004...

  • Page 57: Figure 5-13: Power Supply Schematic

    Service Manual Figure 5-13: Power Supply Schematic L2346 Revision B June 2004...

  • Page 58: Figure 5-14: Control Schematic Pcb (1 Of 5)

    Bear Cub 750PSV Figure 5-14: Control Schematic PCB (1 of 5) L2346 Revision B June 2004...

  • Page 59: Figure 5-15: Control Schematic Pcb (2 Of 5)

    Service Manual Figure 5-15: Control Schematic PCB (2 of 5) L2346 Revision B June 2004...

  • Page 60: Figure 5-16: Control Schematic Pcb (3 Of 5)

    Bear Cub 750PSV Figure 5-16: Control Schematic PCB (3 of 5) L2346 Revision B June 2004...

  • Page 61: Figure 5-17: Control Schematic Pcb (4 Of 5)

    Service Manual Figure 5-17: Control Schematic PCB (4 of 5) L2346 Revision B June 2004...

  • Page 62: Figure 5-18: Control Schematic Pcb (5 Of 5)

    Bear Cub 750PSV Figure 5-18: Control Schematic PCB (5 of 5) L2346 Revision B June 2004...

  • Page 63: Figure 5-19: Display Schematic Pcb (1 Of 4)

    Service Manual Figure 5-19: Display Schematic PCB (1 of 4) L2346 Revision B June 2004...

  • Page 64: Figure 5-20: Display Schematic Pcb (2 Of 4)

    Bear Cub 750PSV Figure 5-20: Display Schematic PCB (2 of 4) L2346 Revision B June 2004...

  • Page 65: Figure 5-21: Display Schematic Pcb (3 Of 4)

    Service Manual Figure 5-21: Display Schematic PCB (3 of 4) L2346 Revision B June 2004...

  • Page 66: Figure 5-22: Display Schematic Pcb (4 Of 4)

    Bear Cub 750PSV Figure 5-22: Display Schematic PCB (4 of 4) L2346 Revision B June 2004...

  • Page 67: Figure 5-23: Bear Cub 750Psv Overlay (P/N 51-09640-00)

    Service Manual Figure 5-23: BEAR CUB 750PSV Overlay (P/N 51-09640-00) L2346 Revision B June 2004...
  • Page 68 Bear Cub 750PSV L2346 Revision B June 2004...

  • Page 69: Chapter 6 Troubleshooting

    Service Manual Chapter 6 Troubleshooting Figure 6-1: Troubleshooting Decision Tree L2346 Revision B June 2004...

  • Page 70: Table 6-2: Troubleshooting

    Bear Cub 750PSV Table 6-2: Troubleshooting Symptom Possible Causes Corrective Action Failed To Cycle 1. Air and Oxygen 1. Verify Inlet Air and O Pressure Alarm Pressure Have Entering The Ventilator. Verify Decreased Below 24 ± 2 Calibration of Air and Pressure PSIG.
  • Page 71 Service Manual Symptom Possible Causes Corrective Action Regulator(S) Defective. Regulator. 3. Defective Oxygen 3. Replace Oxygen Blender. Blender. 4. Replace Defective Check Valve. 4. Defective Cross-Over Check Valve. Front Panel 1. Defective Front Panel 1. Remove and Replace Display PCB. Control(S) Will Not Potentiometer(S).
  • Page 72 Bear Cub 750PSV Symptom Possible Causes Corrective Action Valve. Valve. 4. Adjustable Overpressure 4. Evaluate/Adjust Valve Setting. Relief Valve Setting. 5. Remove and Replace Aopr Valve. 5. Adjustable Overpressure Relief Valve Leaking (With 1 L/Min Flow Setting). L2346 Revision B...

  • Page 73: Chapter 7 Removal & Replacement

    Service Manual Chapter 7 Removal & Replacement WARNINGS • Disconnect all electrical power, air, and oxygen sources before attempting any disassembly. Failure to do so could result in injury to the service technician or damage to equipment. • After replacement of any assembly(ies), always repeat the Operational Verification Procedure (refer to chapter 3), then allow a "burn-in"...

  • Page 74: Flow Valve Assembly Removal

    Bear Cub 750PSV Figure 7-2: Standoff Tube Removal The front portion of the unit will drop forward, stopping when the end of the retaining cord is reached. See Figure 7-3. Figure 7-3: Opening of Front Portion Flow Valve Assembly Removal Disconnect hoses and connectors to the assembly.

  • Page 75: Control Pcb Removal

    Service Manual Figure 7-4: Flow Valve Assembly Control PCB Removal Disconnect all hoses and connectors from the board. Remove screw shown in Figure 7-5. Lift board carefully from four retainer points. Remove board from unit. To install, reverse removal procedure. Figure 7-5: Control PCB L2346 Revision B...

  • Page 76: Display Pcb Removal

    Bear Cub 750PSV Display PCB Removal Remove control PCB . See Control PCB Removal Figure 7-5. Remove five screws shown in Figure 7-6. Figure 7-6: Display PCB Disconnect ground wire. Remove board from unit. To install, reverse removal procedure. Air/O...

  • Page 77: Blender Removal

    Service Manual Figure 7-8: Air / O Regulator Assembly Blender Removal Remove all hoses and wiring connected to the blender. Loosen allen screws of knob located on the front of the ventilator. Remove knob. See Figure 7-9. Figure 7-9: Oxygen % Knob Remove three screws located behind the knob.

  • Page 78: Exhalation Valve Removal

    Bear Cub 750PSV Figure 7-10: Blender Removal Figure 7-11: Blender Assembly Exhalation Valve Removal Remove all hoses and wiring connected to the valve. Remove three screws located on mounting plate. See Figure 7-12. Remove Exhalation Valve from the ventilator. To install, reverse removal procedure.

  • Page 79: Chapter 8 Preventive Maintenance

    Service Manual Chapter 8 Preventive Maintenance Replacement Parts 50000-13040 PM Kit contains the following parts: Air Inlet Disc Filter (1) 52000-00551 O-ring (1) 53021-01012 O2 Inlet Disc Filter (1) 52000-00552 O-ring (1) 53021-01011 Prox Line Filter (1) 51000-01122 Flow Valve Input Filter (1) 52000-01187 Flow Solenoid Pilot Filter (1) 52000-02097...

  • Page 80: Exterior Inspection

    Bear Cub 750PSV Exterior Inspection Turn off the ventilator and disconnect from AC power and pressurized gas at the wall sources. Clean the exterior of the unit with water or a solution of 70% Isopropyl Alcohol solution only. Wipe all surfaces with a soft cloth or disposable wipe moistened in the cleaning solution.

  • Page 81: Ground Resistance Test

    Service Manual CAUTION Circuit boards are subject to damage by static electricity. Do not touch components, circuit, or connector fingers with hands. Handle only by edges. Ground Resistance Test Perform a ground resistance check (follow manufacturer‘s instructions for test equipment operation). Connect a properly functioning leakage and grounding tester between the ground connection and the hospital grade AC plug (middle lug) and the chassis of the ventilator (any unpainted exposed metal part).
  • Page 82 Do not release ventilator for use if it does not pass all of the procedures specified in the checklist. To do so could result in personal injury including death or property damage. Refer the ventilator to a Viasys Service Technician or a Viasys trained Service technician for appropriate repair and/or calibration...

  • Page 83: Chapter 9 Rs-232 Protocol

    Service Manual Chapter 9 RS-232 Protocol Scope This document defines both the hardware and software protocol for the RS-232 communication port on the BEAR® 1000 Adult Ventilator, the BEAR CUB™ 750PSV Infant Ventilator, and the BEAR® Graphics Display. Throughout this document the ventilator shall be defined as the SENDING device, that which transmits real time data and responds to requests for data in the form of other parameters.

  • Page 84: Software Protocol

    Bear Cub 750PSV Alternatively, the ventilator can be interfaced to a DTE device with the following "null- modem" interface. (See table 9-2). Table 9-2: Alternate Pin Assignment DTE Name DTE Pin Direction DTE Pin DTE NAME - - - - - - - - - - <<- - - - - - - -...

  • Page 85: Table 9-3: Valid Requests Received By The Ventilator

    Service Manual of SYN (16h) or DLE (10h) appears in the data packet (including the Check Sum, see below) an escape sequence will be used. The illegal character will be preceded by the DLE character and 10h will be subtracted from its original value. The second character in each packet (both transmitted and received) is defined as the ID character.

  • Page 86: Table 9-5: Real Time Data

    Bear Cub 750PSV Table 9-5: Real Time Data Mode: Continuously, every 10-msec Length: 6 Bytes Format: [ SYN ] [ID] [Data #1] [Data #3] [Check] [ ID ]: 7 — 0 6 — 0 5 — 0 Alarm Condition 4 — X Breath Type 3 —...

  • Page 87: Table 9-6: Adult Ventilator Control Settings

    Service Manual Table 9-6: Adult Ventilator Control Settings Mode: Upon Request Length: 16 Bytes Format: [ SYN ] [ID] [Data #1] [Data #13] [Check] [ ID ] : 20h [ Data #1 ] Mode/Wave: 7 — x 6 — x 5 —...

  • Page 88: Table 9-7: Adult Ventilator Alarm Settings / Status

    Bear Cub 750PSV Table 9-7: Adult Ventilator Alarm Settings / Status Mode: Upon Request Length: 14 Bytes Format: [ SYN ] [ID] [Data #1] [Data #13] [Check] [ ID ] : 40h [ Data #1 ] Alarm Status Byte - 1 Bit 7 —...

  • Page 89: Table 9-8: Adult Ventilator Monitor Status

    Service Manual Table 9-8: Adult Ventilator Monitor Status Mode: Upon Request Length: 18 Bytes Format: [ SYN ] [ID] [Data #1] [Data #15] [Check] [ ID ] : [ Data #1 ] Breath Data Bit 7 — Control Breath (1=on, 0=off) Bit 6 —...

  • Page 90: Table 9-9: Infant Ventilator Control Settings

    Bear Cub 750PSV Table 9-9: Infant Ventilator Control Settings Mode: Upon Request Length: 14 Bytes Format: [ SYN ] [ID] [Data #1] [Data #11] [Check] [ ID ] : A0h [ Data #1 ] Mode & Switches Bit 7 — x Bit 6 —...

  • Page 91: Table 9-10: Infant Ventilator Alarm Settings / Status

    Service Manual Table 9-10: Infant Ventilator Alarm Settings / Status Mode: Upon Request Length: 10 Bytes Format: [ SYN ] [ID] [Data #1] [Data #7] [Check] [ ID ] : [ Data #1 ] Alarm Status Byte-1 Bit 7 — High Breath Rate (1=on, 0=off) Bit 6 —...

  • Page 92: Table 9-11: Infant Ventilator Monitor Status

    Bear Cub 750PSV Table 9-11: Infant Ventilator Monitor Status Mode: Upon Request Length: 20 Bytes Format: [ SYN ] [ID] [Data #1] [Data #11] [Check] [ ID ] : [ Data #1 ] Breath Data — Control Breath (1=on, 0=off) —...

  • Page 93: Chapter 10 Parts List

    Service Manual Chapter 10 Parts List Pneumatic Sub Assembly Auxiliary Pressure Relief Valve ......51000-04668 Air/O2 inlet Manifold Assembly ......51000-09302 Oxygen Blender Assembly ......... 51000-09303 PEEP Valve Assembly ........51-09308-01 Pressure Limit Valve Assembly ......51-09308-02 Flow Control Valve ..........51000-09573 Exhalation Valve Assembly ........
  • Page 94 Bear Cub 750PSV Miscellaneous Knob, Front Panel ..........51000-09461 Knob, Rear Panel, Apnea-Alarm Volume ......... 51000-00261 Knob, Mode Select ..........51000-09514 Knob, Oxygen Blending........56000-00268 Fuse, 0.5A, Slow Blow ........56000-20079 AC Power Cord ..........56090-10540 L2346 Revision B June 2004...

  • Page 95: Chapter 11 Repackaging Instructions

    Service Manual Chapter 11 Repackaging Instructions General The packaging system for the BEAR CUB™ 750PSV Infant Ventilator has been designed to provide a high degree of protection against shipping damage. All shipments of BEAR CUB™ 750PSV Infant Ventilators should be made using the complete packaging system.

  • Page 96: Figure 11-1: Repacking Procedure

    Bear Cub 750PSV Figure 11-1: Repacking Procedure L2346 Revision B June 2004...

  • Page 97: Index

    Service Manual Index % of Tubing Leakage ........17 Humidity............21 Blending ........... 15 I:E Ratio ............18 air Regulator ........... 41, 76 Inlet O Pressure ........... 18 Alarm Loudness ........... 15 Inputs............20 Alarm Silence ..........16 Inspection ............. 34 Alarms ............
  • Page 98 Bear Cub 750PSV Service Procedure ........79 Temperature ..........21 Settings Incompatible........16 Test............... 19 Shipping ............20 Theory of Operation........23 SIMV/IMV........... 13 Total Breath Rate ......... 17 Software Protocol......... 84 Troubleshooting ........... 69 specifications..........13 Ventilator Electronics ........27 STANDBY...........

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