Page 1 7900 Ventilator Supplemental to the Datex-Ohmeda Excel SE and Modulus SE Anesthesia Machine Service Manual. Ventilator Software Revision 2.X...
Page 2 3/27/97 503-0151-000...
Page 3 Ohmeda 7900 Anesthesia Ventilator Supplement to Excel SE and Modulus SE Anesthesia Machine Service Manual Ventilator Software Revision 2.X 3/27/97 503-0151-000...
Page 4 3/27/97 503-0151-000...
Page 5: Table Of Contents
7900 Ventilator Features ........2-2...
Page 6 Table of Contents Inspiratory and Expiratory Flow Measurement ....2-24 Patient Airway Pressure Measurement ....2-24 O2 Concentration Measurement .
Page 7 To Install Ohmeda Software Upgrade Tool ....6-17 To Install 7900 Software Field Upgrade ....6-18 To Perform Software Upgrade .
Page 8 9/ Accessories, Miscellaneous Parts 7900 Accessory and Bellows Mounting Kits: .......9-1 O&M Manuals: .
Page 9 Interface..........2-1 Figure 2-2 7900 Ventilator Operational Block Diagram ....2-2 Figure 2-3 Supply gas inlet, filtered .
Page 10 List of Illustrations Section 6 Figure 6-1 Excel 210 with mid-shelf and integrated 7900 ventilator ...6-2 Figure 6-2 Removing the ventilator from an Excel/Modulus SE Anesthesia Gas Machine ..........6-3 Figure 6-3 Excel 210 without mid-shelf and non-integrated 7900 ventilator .
Page 11 SIB interface, hose and cable routing ......8-5 Figure 8-5 7900 SIB schematic diagram, page 1 of 2 .....8-6 Figure 8-6 7900 SIB schematic diagram, page 2 of 2 .
Page 12 Notes viii 1503-0151-000 3/27/97...
Page 13 1/Introduction Important The information contained in this service manual pertains only to those models of products which are marketed by Ohmeda as of the effective date of this manual or the latest revision thereof. This service manual was prepared for exclusive use by Ohmeda service personnel in light of their training and experience as well as the availability to them of parts, proper tools and test equipment.
Page 14: 1/ Introduction
CAUTION: bility of damage to the equipment. 1.1. What this manual includes This manual covers the Ohmeda 7900 Anesthesia Ventilator which is an integral component in the Ohmeda Excel SE and Ohmeda Modulus ® SE Anesthesia Sys- tems. Data on the control module troubleshooting, disassembly, repair, reassembly, test- ing and calibration are included.
Page 15: Symbols
1/Introduction 1.2. Symbols The following common symbols are used in Ohmeda manuals and on products, however, no one product nor manual has every symbol listed. Refer to this list con- cerning various symbols found. ø On (power) Movement in one direction ˆ...
Page 16 1/ Introduction Plus, positive polar- Systems with this mark agree with Euro- pean Council Directive (93/42/EEC) for medical devices when they are used as XXXX speciﬁed in their Operation and Mainte- nance Manuals. The xxxx is the certiﬁca- tion number of the Notiﬁed Body used by Ohmeda's Quality Systems Ë...
Page 17: Standard Service Procedures
1.4. 7900 Ventilator Conﬁguration The 7900 Ventilator; (hereafter called Ventilator) is an integral part of the Modulus SE and the Excel SE Anesthesia Systems. This Ventilator is not available for use as a stand alone piece of equipment.
Page 18 1/ Introduction Notes: 1503-0151-000 5/26/0...
Page 19: 2/Theory Of Operation
The 7900 Ventilator is a microprocessor based, electronically controlled, pneumat- ically driven ventilator with a built in monitoring system for inspired oxygen, airway pressure and exhaled volume. The 7900 is a "Closed Loop Control Ventilator." Sensors in the breathing circuit are used to control and monitor patient ventilation as well as measure inspired oxygen concentration.
Page 20: 7900 Ventilator Features
Breathing Exhaust to System Valve Ambient Figure 2-2 7900 Ventilator Operational Block Diagram Some 7900 Ventilator Features • No secondary regulator or exhalation solenoids • An exhalation valve that modulates flow in the pressure mode rath- er than being just on and off •...
Page 21: Safety Features
2/Theory of Operation Safety Features • Dual redundant airway over pressure protection, linked to the Pmax setting • Volume over-delivery limits and protection • Ohmeda proprietary hose connections - fixed manifolds to reduce leaks • Uses proven mechanical components • 10 VA - Oxygen compartment separation •...
Page 22 2/Theory of Operation During normal operation the GIV (Gas Inlet Valve) is open to allow the supply gas to flow to the ventilator manifold. This valve provides a shut off of the supply gas to the ventilator when the ventilator is not in use. The GIV also shuts off supply gas to the ventilator under failure conditions as the microprocessor or over-pres- sure switch demands.
Page 23 2/Theory of Operation 35 - 100 psi 25 psi Supply inlet Inlet Inlet Pressure Flow Filter Valve Regulator Valve Supply (GIV) Hose Manifold Pressure Exhaust to Scavenging Exhalation Manifold Valve (AGSR) 30 mm Port 17 mm Port 25 mm Port Bellows Return Bellows Drive Figure 2-7...
Page 24 (17 mm) and the AGSS (Anesthesia Gas Scavenging System) (30 mm). Pilot control of the exhalation valve is accomplished through pneumatic connec- tions internal to the 7900 ventilator main pneumatic manifold. The valve is normal- ly open, requiring approximately 2 cmH O of pilot pressure to seal the breathing circuit.
Page 25 2/Theory of Operation 35 - 100 psi 25 psi Supply inlet Inlet Inlet Pressure Flow Filter Valve Regulator Valve Supply (GIV) Hose Manifold Pressure Transducer Drive Gas Check Valve (DGCV) Exhalation Manifold Mechanical Overpressure Bleed Off (MOBO) Exhaust 17 mm port 25 mm port to Scavenging Exhaust to...
Page 26 2/Theory of Operation 35 - 100 psi 25 psi Supply Inlet Inlet Pressure Flow Filter Valve Regulator Valve Supply (GIV) Hose Manifold Pressure Transducer Bleed Exhaust to Ambient Pressure Drive Gas Check Valve Switch (DGCV) Exhaltion Manifold Mechanical Overpressure Bleed Off (MOBO) Free Exhaust...
Page 27: Electrical
2/Theory of Operation 2.3. Electrical The 7900 Ventilator consists of the following electronic/electrical subassemblies or modules: • Microcontroller Printed Circuit Board • Front Panel Assembly • Power Supply and External I/O Interface Board • Sealed Lead Acid Battery • Power Entry Module and Toroid •...
Page 28: Power Supply Assembly
2/Theory of Operation Power Supply Assembly The power supply board encompasses two functional blocks: power supply and external interface. Power Supply The power supply is divided into three stages, • ac to dc Conversion • dc Step-down Regulator and Battery Charger •...
Page 29 2/Theory of Operation Power Entry Module • Type Line Filter with ac Connector & 5 X 20 mm Fuse holder < 5 µ A @ 250V/50Hz • Maximum leakage current • Fuses 2A 250V. Slow blowing 5X20 mm • Approvals UL 1283, CSA C22.2/8, VDE 0565 &...
Page 30: Synchrononus Step-Down Regulator
2/Theory of Operation ac Power-On Indicato r • Type • Color Green • LED drive current 15mA. • Location Display Board ac Step-Down Regulator and Battery Charger The dc step-down regulator takes the output from ac/dc conversion stage (24-62 Vdc) and converts it to 16.6 Vdc. The battery charge circuit charges the sealed lead acid battery anytime ac power is supplied.
Page 31 2/Theory of Operation The charge time for the sealed acid battery, from a discharged state to full capacity is 10 hours maximum. • Charge levels Bulk charge, over charge and tempera- ture compensated floating charge • Bulk charge current 250mA (c/10). •...
Page 32: External Interface
4. Battery pack is internally fused - in line replaceable. The 7900 is not a portable unit. Batteries for the 7900 Ventilator are used as back up power in case of a power failure. Therefore the battery is in a float charge state most of the time.
Page 33: Microcontroller Assembly
2/Theory of Operation Microcontroller Assembly The Microcontroller Assembly contains all of the major circuit functions necessary to control ventilator operation. This assembly consists of the following individual circuits: Motorola 68340 Processor Core The CPU core consists of the following internal functions: •...
Page 34 2/Theory of Operation Software Watchdog Timer The software controlled internal watchdog timer guards against program execution going astray. External Bus Interface The external bus interface handles the transfer of information between the CPU32, external memory and peripherals. Chip Selects The four programmable chip selects access external memory and peripheral cir- cuits, providing handshaking and timing signals as well as a wait state generation.
Page 35: Program Memory
2/Theory of Operation Program Memory Flash EPROM Two 128K x 8 Flash memory devices are used, with on-board expansion capability to 512K x 8 devices. This memory contains the real time operating system (RTOS) and software code. The Flash memory devices are socketed. System RAM This memory consists of two 32K x 8 CMOS static RAMs with on-board expansion capability to 512K x 8 SRAMs.
Page 36: Watchdog Systems
2/Theory of Operation Watchdog Systems 68040 Software Watchdog Timer The watchdog timer in the 68340 processor activates for a time period appropriate for the application. If it times out due to a software execution fault (e.g. software trapped in an infinite loop), a level 7 interrupt (non-maskable) is internally issued so that the exception handler software can attempt to correct the error transparently.
Page 37: Data Acquisition
2/Theory of Operation DATA Acquisition The data acquisition system for the 7900 Ventilator consists of two major building blocks. The first is an analog to digital converter (ADC) system and the second is a digital to analog converter (DAC) system.
Page 38: Multiplexer And Buffer Amplifier
2/Theory of Operation Signals that are monitored by the ADC system include: • Flow DAC output • Flow Current sense • Inlet Valve Current sense • Patient Pressure • Manifold Pressure • Inspiratory Flow Sensor • Expiratory Flow Sensor • Concentration •...
Page 39: Voltage Reference
2/Theory of Operation Voltage Reference Voltage reference is internal to the MAX191BCWG and adjusted with a potentiom- eter. This reference voltage is buffered and used for the digital to analog converter reference. Flow Valve Control The flow valve control circuit consists of a D/A converter and a voltage to current conversion circuit.
Page 40: Gas Inlet Valve Drive Circuit
2/Theory of Operation Gas Inlet Valve Drive Circuit This circuit consists of a LM2952IM low-dropout regulator providing a regulated 5 Volts to the inlet valve when enabled by the microprocessor. The /SHUTDOWN pin of the regulator provides on/off control. This regulator has an output current of 250mA. It has an internal current limit of 530mA max.
Page 41: Mechanical Ventilation Switch
2/Theory of Operation Mechanical Ventilation Switch This switch is electronically debounced and it inputs to a hardware latch which tog- gles between set and reset states with each depression of the switch. The output of this latch directly drives the ventilation state LED on the front panel as well as controlling the drive signal to the flow valve independent of the processor.
Page 42: Sensor Interface Board (Sib)
2/Theory of Operation Sensor Interface Board (SIB) The Sensor Interface Board, (SIB), is the interface for the ventilator control module and the anesthesia machine. It is designed to be used in the Excel models 110 SE, 210 SE's, and Modulus SE. The SIB is located in the anesthesia machine below the work surface table top.
Page 43: O2 Concentration Measurement
2/Theory of Operation O2 Concentration Measurement The Oxygen sensor generates a linear output voltage that depends upon the con- centration being measured. It produces an output of 57 ±- 14 mV dc at 100% con- centration, therefore its output is amplified by a factor of 52 to make it compatible with the current transmitter.
Page 44 2/Theory of Operation Notes: 2-26 1503-0151-000 3/27/97...
Page 45: 3/Post Service Checkout
3/Post Service Checkout After servicing the ventilator, run any service menu tests that are pertinent to the components replaced; Perform calibration on Flow sensors, Pressure sensitivity, Flow valve and Bleed resistor. You must complete the checkout procedure for the entire system; the ventilator, the anesthesia system, and all the accessories and options.
Page 46 3/Post Service Checkout Notes: 1503-0151-000 5/26/0...
Page 47: 4/Tests And Troubleshooting
Failure to do so may result in patient injury. The 7900 Ventilator has a self test built into its software. This test determines that the software is functioning properly and that the electronic circuits on the circuit boards are functional.
Page 48 4/Tests and Troubleshooting If the calibration of the manifold sensor fails on power up, an alarm occurs and is displayed appropriately "Manifold Pressure Sensor Failure". An error code (1003E) will also register on the error code service mode menu. *If one or more of these tests fail, the display provides a readout which tells the op- erator to contact an Ohmeda Service Representative.
Page 49: Service Mode Menu
4/Tests and Troubleshooting 4.2. Service Mode Menu The service calibration mode tests and/or calibrates hardware necessary to pre- pare a ventilator in the plant for factory shipment and to service a ventilator in the field. Tests may be run manually with the rotary encoder (also called the adjust- ment knob).
Page 50: Diagnostic Tests
4/Tests and Troubleshooting 4.3. Diagnostic Tests Note: For simplicity the following text uses the term control wheel for the knob used to select and confirm settings This knob and the rotary encoder switch attached are also referred to as "The Encoder". Test CPU The software tests the CPU integer instructions as well as the CPU register(s).
Page 51: Test External Ram
4/Tests and Troubleshooting Test External RAM The software tests all of the external RAM memory with a walking bit pattern test. It writes a certain bit pattern to a block of memory and then reads that block of memory. If the bit pattern that it wrote is not the same bit pattern that it reads back the test fails.
Page 52: Test Flash Rom
4/Tests and Troubleshooting Test Flash ROM The software tests the Flash ROM via a CRC check (Cyclic Redundancy Check). A CRC value has been calculated for the Flash ROM memory and this value is stored in the Flash ROM. This test recalculates the CRC for the Flash ROM and compares it to the value stored in Flash ROM.
Page 53: Test Eeprom
4/Tests and Troubleshooting Test EEPROM The software tests all of the EEPROM memory via a bit pattern test. It writes a cer- tain pattern to a block of memory and then reads that block of memory. If the bit pattern that was written is not the same as the bit pattern read back, the test fails. Upon FAIL, replace the microcontroller board.
Page 54: Test Panel Switches
4/Tests and Troubleshooting Test Panel Switches The software will set up the ventilator to receive all button presses and control wheel turns. The test asks the user to press each of the buttons and turn the con- trol wheel one full turn in both directions. Each time a button is pressed the number next to the button is reverse-highlighted.
Page 55 4/Tests and Troubleshooting Panel Switch FAIL Instructions: If any of the select buttons or the adjustment knob turn test fails, replace the front panel board or the control wheel. 1503-0151-000 5/26/0...
Page 56: Test Serial Ports
4/Tests and Troubleshooting Test Serial Ports The software performs an internal test on both of the serial ports. The software sets up the serial ports so any data sent out the serial ports is echoed directly back to that serial port. The test fails if the data sent out is not equal to the data received. The status of the test is displayed on the ventilators front screen.
Page 57: Test Flow Valve
4/Tests and Troubleshooting Test Flow Valve To test the flow valve the software starts off by closing the flow valve. It then opens the flow valve in increments until the flow valve is completely open. At each of the settings of the flow valve the A/D (Analog/Digital) channel for Flow DAC (Digital to Analog Converter) Feedback and Flow Current Sense will be read.
Page 58: Test Gas Inlet Valve (Giv)
4/Tests and Troubleshooting Test Gas Inlet Valve (GIV) To test the gas inlet valve the software first closes the GIV. It then reads the A/D for the GIV. If the A/D for the GIV does not read closed, the test fails. The software then opens the flow valve to the calibrated flow of the bleed resistor.
Page 59: Test Pressure Limit Switch
4/Tests and Troubleshooting Test Pressure Limit Switch The software tests the pressure limit switch to make sure that it trips at the correct manifold over pressure. The software opens the flow valve to a value where pres- sure continues to increase. It then waits for the DPL (Drive Pressure Limit) switch to trip.
Page 60: Pressure Limit Switch Fail Instructions
4/Tests and Troubleshooting Pressure Limit Switch FAIL Instructions: Go to the Discrete I/O signal menu and check the DPL (Drive Pressure Limit) switch status. Disconnect pressure switch tubing from manifold and apply 104 ± 4 cmH2O to activate switch and verify switch status. If signal status does not agree with switch status, disconnect J8 on microcontroller board and measure resistance to determine function of switch.
Page 61: Diagnostic Tools
4/Tests and Troubleshooting 4.4. Diagnostic tools Display A/D channels The software displays the A/D values for each of the A/D channels. Remarks : This selection displays a listing of A/D Channels which are at various values depending upon the set parameters. One check that can be made is a disconnect check or large leak check.
Page 62: Display I/O Signals
4/Tests and Troubleshooting Display I/O signals The software will display all of the I/O signals. Remarks This display is a service tool for: • DPL switch status - shows off unless drive pressure has exceeded limit (switch is N.O.) • flush switch status - shows on or off when pushing and releasing gas machine O flush valve...
Page 63: Display Battery Charge Status
4/Tests and Troubleshooting Display Battery Charge Status The software displays the battery charge status. This checks to see if the battery charge is greater than or equal to 12.5 volts. If it is less than 12.5 volts, the battery charge status displays that the battery is not charged. If it is greater than or equal to 12.5 volts, the battery charge status displays that the battery is charged.
Page 64: System Error Log
4/Tests and Troubleshooting System Error Log The software displays the most current 10 errors that have been logged. The error code, address, and software revision are important pieces of information if technical support is required. Remarks Note: The following Error Log table lists codes for those errors that pertain to ser- vice.
Page 65: System Error Log Codes
4/Tests and Troubleshooting System Error Log Codes The following table of error codes are numerical in order and may be referenced from the "System Error Log" menu displayed. Check the number on the menu and reference this table for description and service action. Actions are numbered in a logical action sequence.
Page 66 ﬂow sensor EEPROM Test Flow Sensors. Replace faulty ﬂow sen- failure sors 2. Check cable connections at SIB and the SIB to 7900 cable 3. Replace the SIB 4. Replace the CPU board 10032 Minimum system monitoring 1. System has DCGO in aux..position but...
Page 67 4/Tests and Troubleshooting Error Code Description of error logged Service Action 10047 Minimum system shutdown SIB 1. Reboot the system, if problem continues measure +15V ± 5% on J3 pin 1 to pin 2. If 15V test failed out of spec disconnect CPU and measure again.
Page 68 4/Tests and Troubleshooting Error Code Description of error logged Service Action 10058 Minimum system shutdown 1. Reboot the system, if problem continues V_AUX test failed measure V_AUX. J3 pin 5 and pin 6. If out of spec disconnect CPU board, measure again.
Page 69: Verify Flow
This service tool can be used for directly controlling the output of the flow valve. Gas from the 7900 flow valve exits from three separate areas; the two drive hoses and the bleed resistor. Independent measurements of flow valve output must capture all gas from these ports or provide for their occlusion.
Page 70: Calibrations
4/Tests and Troubleshooting 4.5. Calibrations Calibrate O Sensor See operation and maintenance manual. The software calibrates the O2 sensor at a selected altitude, see "Select Altitude" menu. Set the appropriate altitude for the machine location. The software in the ventilator calibrates the O2 sensor by reading the A/D for the O2 sensor when the O2 sensor is exposed to room air (21% O2).
Page 71: Calibrate Flow Sensors
4/Tests and Troubleshooting Calibrate Flow Sensors See operation and maintenance manual. The software calibrates the inspiratory flow, expiratory flow, airway pressure and manifold pressure transducers for zero pressure offset voltage. It does so by read- ing the A/D for inspiratory flow, expiratory flow, airway pressure and manifold pres- sure when the flow sensors have been disconnected from the patient interface panel.
Page 72 4/Tests and Troubleshooting Remarks Fail - indicates a problem with the SIB, check for bad differential pressure trans- ducer. Check the transducer outputs using the Display A/D menu. Ensure that the flow sensors are disconnected from the interface panel. If the transducer is out of tolerance, replace the SIB assembly.
Page 73 4/Tests and Troubleshooting Remarks Fail - indicates a problem with the SIB, check for bad differential pressure trans- ducer. Check the transducer outputs using the Display A/D menu. Ensure that the flow sensors are disconnected from the interface panel. If the transducer is out of tolerance, replace the SIB assembly.
Page 74: Calibrate Pressure Sensitivity
4/Tests and Troubleshooting Calibrate Pressure Sensitivity The software prompts the user to perform the procedure to calibrate the pressure sensitivity (This pressure transducer calibration is to be performed if the SIB control module or microcontrol board is replaced). This calibration is not an automated calibration.
Page 75 4/Tests and Troubleshooting Pressure Sensitivity Fail 1. Select "Display A/D Channels" from the main service menu. Set Fresh gas flow to 2 Lpm. Open the APL valve (0 cm H Place Bag to Vent switch in the Bag/APL position. Connect a short tube between the inspiratory and expiratory flow sensors.
Page 76: Calibrate Flow Valve
4/Tests and Troubleshooting Calibrate Flow Valve The software prompts the user to perform the procedural steps to calibrate the flow valve. This is an automated calibration. It gradually opens the flow valve and mon- itors the manifold pressure. When the manifold pressure reaches 1.9 to 2.0 O the value at which the flow valve has been opened is saved.
Page 77: Calibrate Bleed Resistor
4/Tests and Troubleshooting Calibrate Bleed Resistor The software calibrates the bleed resistor using the following procedure steps (be- sides the setup procedure this calibration is completely automated). First the soft- ware finds the value at which to set the flow valve to get a manifold pressure of 91- 92 cmH O.
Page 78 4/Tests and Troubleshooting Remarks: If the bleed resistor calibration test fails, check altitude and drive gas settings. Ensure that the breathing circuit gas is exhausting out the scavenging port during the test. A negative finding indicates a massive circuit leak. Check for proper regulator pressure calibration.
Page 79 4/Tests and Troubleshooting Remarks The calibration is performed as follows: 1. Open the flow valve to the starting point that was found (where manifold pressure is 91-92 cm H 2. Wait for the flow to stabilize. 3. Once the flow stabilized, set the flow to 12 L/min. 4.
Page 80: Sensor(S) Cal Due
4/Tests and Troubleshooting Sensor(s) Cal Due This menu displays which sensors or setting must be performed when the "Sen- sors Cal Due" alarm appears in normal operation. After the cal/setting is properly completed, the text for that cal/setting will be removed. If the "Sensor(s) Cal Due"...
Page 81: User Settings
4/Tests and Troubleshooting 4.6. User Settings These setting are for the convenience of the service person so they can make changes without having to go back to the main operating menus Select Altitude This provides the user with the means to select the altitude setting. Displays Select Drive Gas This provides the user with the means to select the drive gas.
Page 82: Adjust Brightness
4/Tests and Troubleshooting Adjust Brightness This provides the user with the means to select the display brightness. Select Heliox Mode This provides the user with the means to select the Heliox mode with systems hav- ing ANSI gas systems with Heliox flow tubes installed. Set "Select Heliox Mode" to Available to allow the user to turn Heliox mode on or off during the normal opera- tions mode.
Page 83: Exit Service Mode
4/Tests and Troubleshooting Exit Service Mode Provides the means to exit the service mode via a hardware reset. Allows the service person to return to the main operating waveform display and operating menu. 1503-0151-000 5/26/0 4-37...
Page 84: Troubleshooting Guides
4/Tests and Troubleshooting 4.7. Troubleshooting Guides Some ventilator problems may not generate any ventilator messages, even though the ventilator may not be functioning correctly. Operational alarm messages are found in the Operation and Maintenance manual. Actions are numbered in a logical action sequence. If action 1 fixes error, stop there, if action 3 fixes error return actions 1 and 2 to previous status.
Page 85 1. 50 position cable, external cable 1. Ensure cable is plugged in prop- on when remote on/ SIB to 7900 erly at 7900 and SIB off switch is turned on and AC LED is on 2. Remote on/off switch cable 2.
Page 86: Troubleshooting By Alarm Messages
4/Tests and Troubleshooting beeping audio alarm can be silenced only by turning the ventilator or anesthesia machine, as applicable, power switch OFF and after five seconds back ON. w w w w Manual ventilation must be performed when electrical interference caus- WARNING: es interruption of ventilator delivered mechanical ventilation.
Page 87 4/Tests and Troubleshooting Alarm Condition/Probable Cause Service Action Message/Symptom Inspiratory ﬂow sensor EEPROM cal data read failure Remove ﬂow sensor from breath- Fail (using default cal data ing circuit. Expiratory ﬂow sensor Fail Disconnect from patient interface panel and reconnect sensor. If error message goes away, sensor OK.
Page 88 4/Tests and Troubleshooting Alarm Message/ Condition/Probable Cause Service Action Symptom Control setting input has Internal software error has Reboot ventilator, if problem con- failed occurred in a control setting tinues replace CPU board change initiated by the user. Minimum system monitor- Monitoring still available CPU Failure ALU, register,...
Page 89 4/Tests and Troubleshooting Alarm Condition/Probable Cause Service Action Message/Symptom Memory (EEPROM) Fail- 1. If EEPROM or CPU board was Reboot ventilator, if problem con- replaced, reboot the ventilator tinues replace CPU board 2. Read/write failure, CRC failure 3. Default values will be used at power up Memory (ﬂash) Failure CRC failure.
Page 90 4/Tests and Troubleshooting Alarm Condition/Probable Cause Service Action Message/Symptom +15V analog Out-of-Range + 15V out of range 1. Reboot ventilator, if problem continues measure +15V±.75V at Minimum System Shut- J3 pin 1 and pin 2. If out of spec, down disconnect CPU, measure again.
Page 91: Maintenance Schedule
Internal Battery - Dispose of battery according to local codes Free Breathing Valve Free Breathing Valve Seat O-ring During a maintenance visit, user level maintenance must be performed in addition to this maintenance. User level maintenance can be found in the 7900 Ventilator, Operation and Maintenance manual. 1503-0151-000 5/26/0...
Page 92: Maintenance Procedures
5/Maintenance 5.2. Maintenance Procedures To Replace the internal battery you must remove the control module from the an- esthesia system and remove the cover, see section "6/Repair Procedures" for more information. Exhalation Valve Maintenance See the Operation and Maintenance manual for maintenance and parts. Supply Gas Inlet Filter 1.
Page 93: Free Breathing Valve Maintenance
5/Maintenance w w w w Once you start the threads on the filter bowl, with the O-ring CAUTION mounted to the bowl, do not back out the filter bowl unless you take the it all the way out and restart the mounting. If the bowl is partially unscrewed or backed out from the manifold seat, the O- ring will slip out of place and result in an unacceptable leak.
Page 94 5/Maintenance 3. Inspect the flapper and valve seat for nicks, debris and cleanliness. 4. Pull the tail of the new free breathing valve flapper through the cen- ter of the valve seat until it locks in place. 5. Trim the tail in line with the bottom edge of the valve seat, see figure 5-3.
Page 95: 6/ Repair Procdures
6/ Repair Procedures 6.1.General w w w w Post-Service Checkout is required after you complete this section. You WARNING: must perform section " 3/Post-Service Checkout" after performing any maintenance, service or repair. Failure to do so may result in patient injury. w w w w When servicing the ventilator, extreme care must be taken to avoid introduc- WARNING: ing foreign debris, particularly metal chips generated by screw threads into...
Page 96: Removing The 7900 Ventilator From The Ohmeda Excel/Modulus Se Gas Machine
6/ Repair Procedures 6.2. Removing the 7900 ventilator from the Ohmeda Excel/Modulus SE Gas Machine There are two versions of 7900 ventilator/anesthesia machine mounting, Integrat- ed and non-integrated. Ventilator Ventilator shroud Middle shelf Figure 6-1 Excel 210 with mid-shelf and integrated 7900 ventilator Integrated;...
Page 97 6/ Repair Procedures 3. Remove the dual hose for drive/return gas connecting the bellows to the exha- lation valve and remove the exhaust hose from the exhalation valve manifold. Track on which the ventilator mounts in the Excel/Modulus SE Gas Machine Slot into which the locking screw fits for secure mounting Locking screw, holds the ventilator in place on the track when tightened Rear panel locking tabs, push toward the center to release cover...
Page 98: Removing The 7900 Ventilator From The Non-Integrated Machine
Figure 6-3 Excel 210 without mid-shelf and non-integrated 7900 ventilator Non-integrated; the anesthesia machine has no mid shelf and the 7900 fits in a shroud mounted to the under side of the top shelf w Do not pull the exhalation valve manifold hoses straight down from the CAUTION: block assembly to remove them.
Page 99 Ventilator shroud. Mounts onto the top shelf and has a front bezel Figure 6-4 Non-integrated 7900 ventilator and mounting tray insertion 1. Remove the dual hose for drive/return gas connecting the bellows to the exhalation valve. 2. Remove the exhaust hose from the exhalation valve manifold.
Page 100 CAUTION: w The ventilator weighs approximately 40 pounds. Use care in its removal. 8. Remove the 7900 Ventilator and mounting tray from the anesthesia machine. 9. It is necessary to remove the mounting tray to set the ventilator on the service shelf.
Page 101: Setting Up The Service Shelf
The service shelf folds for easy storage. When setting up ensure the four locking screws are secure. w The circuit boards are electrostatic sensitive. Set the 7900 service shelf CAUTION: on an anti-static work station and wear a wrist grounding strap while working on the boards.
Page 102 6/ Repair Procedures Figure 6-7 Put the ventilator on the service shelf 2. Arrange the ventilator so the rear is toward the left side of the gas machine. 3. Set the ventilator down on the service shelf so the locking screw fits below the mounting rail.
Page 103: Removing The Top Cover
6/ Repair Procedures 6.4. Removing the top cover Top cover mounting screws (4) Ground wire, do not pinch when replacing cover Figure 6-8 Removing the top cover screws and cover Once the ventilator is secure upon the service shelf and firmly located on the gas machine work surface, remove the four screws holding the louvered cover to the ventilator chassis.
Page 104 6/ Repair Procedures 1. Battery retainer 12. Supply gas filter 2. Front panel board 13. Locking handle 3. Battery harness Exhalation valve block (manifold) 4. Ground wires 15. Pneumatic bleed resistor 5. Speaker Mechanical over pressure valve (MOBO) 6. Isolation transformer 17.
Page 105: Printed Circuit Board And Power Module Removal
6/ Repair Procedures 6.5. Printed circuit board and power module removal Removing the Power Supply circuit board and the Microcontroller circuit board Note: To remove the microcontroller circuit board you first must remove the power supply circuit board. Removing Power Supply circuit board 1.
Page 106 6/ Repair Procedures If removing the power supply board or the microcontroller board, remove the fol- lowing connectors; see illustration numbered callouts that correspond to the follow- ing steps. 1. Disconnect the battery cable connector (J1) from the power supply board. Connector has lock tabs.
Page 107 6/ Repair Procedures Power supply board has two captive securing screws. Finger tighten, low torque. Power supply board. Power supply board connector for isolation transformer cable. Key hole slots for angle mounting flange. Battery connection (J1) to power supply board. See step 5 in previous proce- dure.
Page 108: Removing Microcontroller Circuit Board
6/ Repair Procedures Removing Microcontroller circuit board w Disconnect the internal battery before attempting to remove or repair any CAUTION: circuit board. Failure to do so may damage the internal electronics. 1. Pneumatic quick-connect fitting from main manifold 2. Connector from pressure sensor switch (J8) 3.
Page 109 6/ Repair Procedures If removing the microcontroller board, remove the following connections, see illus- tration numbered callouts to follow the steps below listed. Board removal requires power supply board removal to clear the pneumatic fitting and the transducer mounted on the microcontroller board. w The circuit boards are electrostatic sensitive.
Page 110: Firmware Replacement Procedure
6/ Repair Procedures See previous illustration numbered callouts for the following steps. 1. Loosen the four (4) captive securing screws all the way, three across the top of the board and one (1) half way down on the left side of the board. They may require an off-set, flat-blade screwdriver to loosen initially.
Page 111: Software Upload Procedure
6/ Repair Procedures Software Upload Procedure The 7900 Ventilator software can be field upgraded using the Ohmeda Software Upgrade Tool software (1503-8019-000) and Field Upgrade 7900 Vent software. The Ohmeda Software Upgrade Tool must first be installed on a IBM or compatible PC, and at least one version of field upgrade software must be installed.
Page 112: To Install 7900 Software Field Upgrade
The software in the Cable Software Upgrade kit must be installed before follow- ing these instructions. 1. Turn on the computer and enter Windows. 2. Insert the 7900 field upgrade installation diskette in drive A. 3. From the File menu of the Program Manager or File Manager, choose Run. 4. Type a:setup 5.
Page 113: Removing The Front Panel
6/ Repair Procedures Removing the front panel 1. Disconnect the ribbon cable (J2) from the front panel. 2. Use the 2.5 mm hex wrench to remove the two chassis mounting screws. Figure 6-14 Front panel removal 3. Lift the front panel up to clear mounting pins and remove it from the chassis. Replacing the display board 1.
Page 114 6/ Repair Procedures 3. Set the cable aside for reassembly. Figure 6-16 Remove display board 4. Use 5.5 mm nut driver to remove the four hex-head mounting nuts. 5. Lift out the display board. 6. When installing, check for debris and/or finger prints on the panel face. Clean with isopropyl alcohol as necessary.
Page 115: Replacing The Encoder Switch
6/ Repair Procedures Replacing the encoder switch 1. Encoder harness, connect to front panel 2. Encoder switch 3. Locking washer 4. Tab, align tab into hole in circuit board 5. Flat washer 6. Mounting nut use 14 mm wrench 7. Knob, spring friction "D" shaft Figure 6-17 Replacing the encoder 1503-0151-000...
Page 116: Removing The Battery
6/ Repair Procedures Removing the battery 1. Foam battery retainer 2. Battery harness route through cutout, item 4 3. Battery 4. Hole for battery harness routing 5. Power module bracket assembly with slot for ribbon cable Figure 6-18 Battery removal 6-22 1503-0151-000 5/26/0...
Page 117: Testing After Maintenance
6/ Repair Procedures See previous illustration numbered callouts. 1. Remove the foam battery retainer. 2. Disconnect the battery cable connector from the power supply board. 3. Lift the cable out of the slot in the power module. 4. Remove battery and dispose of according to local regulations 5.
Page 118: Replacing The Isolation Transformer
6/ Repair Procedures 6.6. Replacing the isolation transformer Removing the power module 1. Disconnect the ribbon cable from the front panel. Squeeze the locking tabs on the connector. 2. Disconnect the alarm speaker cable from the microcontroller board. 3. Disconnect the isolation transformer cable from the power supply board. 4.
Page 119: Prepare Power Module For Removal
6/ Repair Procedures Prepare power module for removal Threaded holes for mounting screws (item 5) to mount the power cord bracket. Power cord fuse block Power cord securing bracket Lock washers No. 4 external Bracket mounting screws 4x8 mm button/socket head Figure 6-20 Power cord removal 1503-0151-000...
Page 120: Isolation Transformer Removal
6/ Repair Procedures Isolation transformer removal Transformer mounting bolt Nylon sleeve Transformer ground wire Alignment hole Transformer coil Rubber insulator Mounting plate Nylon sleeve Nyloc nut Figure 6-21 Isolation transformer removal When you lift out the power module, the a-c power connector block comes out with the unit.
Page 121: Alarm Speaker Removal
6/ Repair Procedures Alarm speaker removal Figure 6-22 Alarm speaker removal 1. The power module must be removed from the chassis to gain access to the alarm speaker mounting nuts. This requires the disconnection of the alarm speaker cable from the microcontroller board (J1) 2.
Page 122: Power Cord Inlet Removal
6/ Repair Procedures Power cord inlet removal Figure 6-23 Power cord inlet connector removal 1. Item 1, figure 6-23 is the a-c inlet power connector where the two, 2 ampere line fuses are located. Fuses may be replaced without removal of the inlet con- nector.
Page 123: Pneumatic Subassembly Removal
6/ Repair Procedures 6.7. Pneumatic subassembly removal As with the electronic circuit boards and the power module, each of the pneumatic subassemblies can be removed without having to remove other components. Note: The subassemblies for removal are shown with other subassemblies re- moved in some cases.
Page 124: Removing The Flow Control Valve
6/ Repair Procedures Removing the flow control valve 1. Disconnect the cable connector (J7) from microcontroller board. Figure 6-25 Disconnect the flow control valve cable 2. Use the 3 mm hex wrench to loosen the two (2) captive mounting screws and lift out the flow control valve.
Page 125 6/ Repair Procedures 1. Flow control valve cable connector to J7 microcontroller board 2. Captive mounting screws (2) Figure 6-26 Flow control valve removal 1503-0151-000 5/26/0 6-31...
Page 126: Removing The Solenoid And Gas Inlet Valve Assembly
6/ Repair Procedures Removing the solenoid and gas inlet valve assembly 1. Solenoid socket head mounting screws 1.5 mm hex wrench 2. Cable connector to J6 microcontroller board 3. Captive mounting screws 4. Cable connector from pressure switch Figure 6-27 Inlet valve and solenoid switch removal 1.
Page 127: Gas Inlet Valve Repair
6/ Repair Procedures 6.8. Gas Inlet Valve Repair Retaining ring Valve cap O-ring Shuttle with upper U-cup Lower U-cup O-ring Inlet valve housing Captive mounting screw Gas inlet port 10. Captive mounting screw Cross section view Retaining ring U-cup seal, upper Valve housing Shuttle body U-cup seal, lower...
Page 128 6/ Repair Procedures pen-light to look into the gas inlet port (See cross section view, item 6). You should see a shoulder of the shuttle. w Do not push hard against the shoulder. Do not use an object that has a CAUTION: sharp or pointed end to lift the shuttle.
Page 129: Removing The Mechanical Over-Pressure Bleed Off Valve (Mobo)
6/ Repair Procedures Removing the Mechanical Over-pressure Bleed Off valve (MOBO) assembly Cover screws M4 x 8 button head No-pilot weight cover Captive MOBO mounting screws Threaded for cover screws Cylinder hole for alignment tool and no-pilot weight No pilot weight and pressure seal. Port with O-ring Pressure seal for no-pilot weight Diaphragm for pilot weight...
Page 130: Mobo Removal (See Figure 6-30)
6/ Repair Procedures MOBO removal (See figure 6-30) 1. Use the 3 mm hex wrench to loosen the two (2) captive mounting screws hold- ing the MOBO body (item 2) to the pneumatic manifold. 2. Lift off the MOBO housing from the manifold. Weights will remain on the man- ifold.
Page 131 Top cover, no-pilot weight cylinder No-pilot weight cylinder Captive MOBO assembly mounting screws MOBO assembly body Port for no-pilot weight Port with O-ring Port for pilot weight diaphragm 10 7900 main manifold Figure 6-31 MOBO alignment and installation 1503-0151-000 5/26/0 6-37...
Page 132: Mechanically Cycle Mobo Weights (See Figure 6-30)
6/ Repair Procedures Mechanically cycle MOBO weights (See figure 6-30) 1. Check to ensure smooth operation of the MOBO weights by lifting them mechan- ically. Remove the exhalation manifold to gain access. Use a blunt object to push the weights up and then allow them to drop back down. See figure 6-32. Regulated pressure check port Free breathing valve Supply gas filter bowl...
Page 133: Removing The Drive Gas Check Valve Assembly
6/ Repair Procedures Removing the Drive gas check valve assembly Captive mounting screws O-ring Alignment hole Pressure switch harness Figure 6-33 Drive gas check valve removal w The internal components of the Drive Gas Check Valve are precisely po- CAUTION sitioned.
Page 134: Removing The Pressure Sensing Switch Assembly
6/ Repair Procedures 1. Use a 3 mm hex wrench to loosen the drive gas check valve captive mounting screws. 2. Lift out the valve assembly. 3. Inspect the O-ring and seat for damage. Replace as necessary. 4. When installing the valve, do not pinch the pressure harness, item 2. 5.
Page 135: Sib Removal From Excel/Modulus Se
6/ Repair Procedures w Do not disconnect the hoses while the SIB is under pressure. This may CAUTION: damage the SIB components. Ensure the flow transducers are not pres- surized by removing the breathing circuit before disconnecting any of the SIB interconnecting hoses. 6.9.
Page 136: Sib (Sensor Interface Board) Assembly Removal
SIB mounting screws on the underside of the pan. 13. Remove the two mounting screws (Note: On machines that had the 7900 ret- rofitted in the field, the SIB is mounted to a plate. The Mounting Plate mounting screws are forward of the mounting screws shown in Figure 6-35, at the two forward corners of the plate.
Page 137: Replacement Calibration Instructions (Sib)
6/ Repair Procedures Replacement Calibration Instructions (SIB): If the SIB must be replaced, follow the "Replacement Calibration Instructions" for the Microcontroller Board. See "Removing Microcontroller circuit board" at the be- ginning of this section. Prior to placing the system in operation, all procedures in section 4 and the preoperative checkout must be completed.
Page 138: Patient Interface Panel/Harness Assembly Removal From Modulus Se
6/ Repair Procedures Handle, sensor interface, 1002-3952-000 (2) Label, patient interface, 1001-3464-000 Panel, sensor interface 210, 1002-3970-000 Screw, # 10-32 x 3/8, 0140-6231-106 (4) Nut, keps M4, 0144-3717-314 (2) Harness, SA, SIB, 1503-3081-000 Figure 6-36 Patient interface/harness assembly (shown mounted on Excel 210 SE left side) w Do not disconnect the hoses while the SIB is under pressure.
Page 139 6/ Repair Procedures 5. Remove the Tabletop from the Modulus SE. See Modulus SE Service Manual section 5.3. 6. Disconnect the four color coded tubing connectors from the SIB Assembly tubing. 7. Carefully cut and remove the cable ties that secure the electrical harness to the pan.
Page 140: Sib/Machine Interface Harness Removal
6/ Repair Procedures 6.12. SIB/Machine Interface Harness Removal 1. Set the SE System Master Switch to OFF. 2. Unplug the system AC power cord from the AC source. 3. Remove the Tabletop from the SE. See Excel Service Manual section 5.1, Modulus SE Service Manual section 5.3.
Page 141: 7/ Illustrated Parts List
The following illustrations are shown in a disassembled form for easier illustration of parts as they are disassembled. The 7900 Ventilator has a pneumatic section and an electronic section. They are separated by a barrier with a gasket to keep pneumatic gasses from leaking over into the electronic section.
Page 142: Figure 7-1 Top Cover
7/ Illustrated Parts List Screw M4, 0140-6226-111 (4) Label set, 1503-3027-000 (includes fuse label on bottom chassis) Figure 7-1 Top cover Washer, 9213-0540-003 Ground wire, 1500-7037-000 Hex nut, 0144-3717-314, Top cover, 1503-3031-000 Figure 7-2 Top cover ground wire connections 1503-0151-000 3/27/97...
Page 143 7/ Illustrated Parts List Figure 7-3 Isolation barrier gasket, 1503-3018-000 Signal harness, 1503-3054-000 DC power harness, 1503-3053-000 Keyboard/microboard harness, 1503-3052-000 Screw M4 x 8, 1503-3135-000 Main chassis, 1503-3040-000 Figure 7-4 Front panel assembly mounting and harnesses 1503-0151-000 3/27/97...
Page 144 7/ Illustrated Parts List Key board, front panel, 1503-3010-000 Bezel, 1503-5001-000 Keps nuts M4, 0144-3717-314 (6) Figure 7-5 Front panel key board and bezel EL display kit, 1503-8010-000 Keps nut M3, 0144-3717-302 (4) Figure 7-6 EL display panel mounting 1503-0151-000 3/27/97...
Page 145 7/ Illustrated Parts List Harness display/keyboard, 1503-3051-000 Ground harness, 1500-7048-000 2a. Keps nut M4 (not shown), 0144-3717-314 (2) 2b. Washer M4 (not shown), 9213-0540-003 (2) Keyboard/microboard harness (not shown), 1503-3052-000 Figure 7-7 Front panel display assembly harnesses Rotary encoder, 1503-3012-000 includes all parts except the knob Knob,1503-3030-000 Figure 7-8 Encoder, rotary, 16 position with push button switch.
Page 146: Figure 7-9 Chassis Bottom View
7/ Illustrated Parts List Mounting shelf locating pins for anesthesia system, 1503-5013-000 Power cord fuse block, 1503-3020-000. See figure 7-11 Power cord receptacle, see Figure 7-11 Power cord bracket, 1503-3070-000 Bracket mounting screws, 0140-6226-118 (2), lockwashers 9213-0540-003 (2) Threaded hole for shipping screw Locking knob, 1301-3018-000 Deflector tube for free breathing valve, 1503-3110-000 Power cord (not shown)
Page 147: Figure 7-10 Power Module Mounting
7/ Illustrated Parts List Keps nut M4, 0144-3717-314 (3) Ground harness, 1500-7048-000 2a. Keps nut (not shown), 0144-3717-314 (2) 2b. Washer M4 (not shown), 9213-0540-003 (2) Label set, 1503-3027-000 Figure 7-10 Power module mounting Connector, AC inlet 1503-3000-000 1a. Fuse 2 amp 250V 5x20 mm delayed time (not shown), 1503-3073-000 (2) Filter harness, 1500-7053-000 2a.
Page 148: Figure 7-12 Alarm Speaker
7/ Illustrated Parts List Speaker, 1503-3106-000 Keps- nut, M3, 0144-3717-302 (2) Figure 7-12 Alarm speaker Parts 1 through 9 are included with the transformer under part number 1503-3017-000. 1. Bolt 6. Rubber insulator 2. Nylon sleeve 7. Mounting plate 3. Ground wire 8.
Page 149: Figure 7-14 Battery
7/ Illustrated Parts List Foam retainer block, 1503-3021-000 12 Volt battery with harness, 1503-3045-000. Battery fuse, 4 amp inline, 1503-3074-000 (not shown) supplied with battery Figure 7-14 Battery Screw M4 x 8, 1503-3135-000 (4) Bleed orifice, 1503-5003-000 2a. O-ring (not shown), 0210-0547-300 Figure 7-15 Pneumatic manifold mounting 1503-0151-000...
Page 150: Figure 7-16 Manifold Components
7/ Illustrated Parts List Drive gas check valve assembly 1503-3006-000 O-ring - 1503-3057-000 Flow control valve, 1503-8013-000 Regulator, 1503-3004-000 Figure 7-16 Manifold components O-rings, 1503-3056-000 (6) O-ring, 0210-0538-300 (1) Figure 7-17 Pneumatic manifold O-rings 7-10 1503-0151-000 3/27/97...
Page 151: Figure 7-18 Gas Inlet Valve
7/ Illustrated Parts List Solenoid mounting screws, included with solenoid Solenoid, 1503-3088-000 Gas inlet valve body, 1503-8012-000* Retaining ring, 1500-3158-000 GIV cap, 1503-5006-000 O-ring, 32.1 ID 35.3 OD, 9221-3032-116 GIV shuttle with U-cups Suttle (poppet), 1503-5018-000 U-cup (upper) 26.98 OD 20.63 ID,1503-3090-000 U-cup (lower)17.02 OD 5.33 ID,1503-3089-000 O-ring, 15.6 ID 20.4 OD Vito1503-3108-000 * Includes mounting screws 1503-3105-000 (2)
Page 152 7/ Illustrated Parts List Screw M4, 9211-0640-083 (2) Alignment hole cover, 1503-3122-000 O-ring, 1503-3056-000 Seal pressure valve*† Diaphragm MOBO† Weight, no pilot, 1503-5015-000 Weight, pilot, 1503-5014-000† Installation alignment tool, 1503-3124-000† Housing MOBV, 1503-5016-000, mounting screw (not shown) 1503-3105-000 (2) Installation alignment tool must be used when replacing seal †...
Page 153 7/ Illustrated Parts List Screw M3 x 6, 9211-0430-063 (2) Pressure switch, 1503-3023-000 Ground harness, 1500-7049-000 3a. Screw M4 (not shown), 0140-6226-118 3b. Washer M4 (not shown),9213-0540-003 (3) 3c. Keps nut M4 (not shown), 0144-3717-314 Fitting with o-ring, 1503-3007-000 (2) Tubing (not shown), 0994-6370-010 (90 mm long 2 pieces) 5a.
Page 154: Figure 7-23 Free Breathing Valve
7/ Illustrated Parts List O-ring Filter element Filter bowl Service Kits - O-rings and filter element, 1500-3320-000 - Replacement kit complete filter assembly, 1500-3319-000 Figure 7-22 Supply gas filter assembly, see O & M Manual Valve flapper, 0211-1454-100 O-ring, 1503-3034-000 Check valve seat, 0207-5590-100 Tube, oxygen deflector, 1503-3110-000 Figure 7-23...
Page 155 7/ Illustrated Parts List Diaphragm assembly, 1503-3000-000 Exhalation valve assembly, 1503-3001-000 Exhalation valve kit (not shown) includes 2 diaphragms, 2 o-rings, gasket and manifold assembly,1503-8004-000 Figure 7-24 Exhalation manifold valve, see O&M Manual Figure 7-25 SIB (Sensor interface board) assembly, 1503-8009-000 1503-0151-000 3/27/97 7-15...
Page 156: Sib Harnesses
SIB/Machine interface harness, 1503-3082-000 (connects O flush, system ON/ Standby and DCGO on French machines). SIB/7900 Ventilator cable, 1503-3075-000 (connects between the SIB and Venti- lator). Serial interface cable, 7900/RGM, 1503-3076-000. Serial Interface cable, 1503-3077-000 (connects between the ventilator and RS- 232 device).
Page 157 SIB interface, hose and cable routing..... 8-5 Figure 8-5 7900 SIB schematic diagram, page 1 of 2 ....8-6 Figure 8-6 7900 SIB schematic diagram, page 2 of 2 .
Page 158 8 /Schematics Figure 8-1 System connection block diagram 7900 Ventilator- 1503-0151-000 1-97...
Page 159 8 /Schematics Figure 8-2 SIB schematic diagram interface cable connections 7900 Ventilator- 1503-0151-000 1-97...
Page 160 8 /Schematics Figure 8-3 Patient interface cable - Machine side 7900 Ventilator- 1503-0151-000 1-97...
Page 161 1. Coded yellow Expiratory transducer high 2. Coded blue Expiratory transducer low 3. Coded black Inspiratory transducer low 4. Patient interface cable connect 5. SIB/7900 Vent interface cable 6. Coded natural Inspiratory transducer high and airway pressure monitor connect 7. SIB assembly housing 8.
Page 162 TRACEWIDTH=250 VSET NEAR AD694 PIN 5 250VAC CONNECT SHELL TO CHAS_GND 51.1K NET CONNECTED TO ANALOG 1/8W GND NEAR AD822 AND 88.7K 1/8W 2.55K 1/8W 1/8W Figure 8-5 7900 SIB schematic diagram, page 1 of 2 7900 Ventilator- 1503-0151-000 1-97...
Page 163 100PF SCLK_PLUS NEAR AD694 PIN 5 SH1,2 ZJK5103-05 1500PF MTG1 NEWO2_SENSE+ O2_SENSE- 1/8W SMBJ6.0A CHAS_GND;16,17 SCLK_MINUS SH1,2 CONNECT SHELL TO CHAS_GND JOINED NEAR 50 PIN CONNECTOR Figure 8-6 7900 SIB schematic diagram, page 2 of 2 7900 Ventilator- 1503-0151-000 1-97...
Page 164: Figure 8-7 Microcontroller Board Schematic Diagram
0.1UF I/O11 I/O12 WD_CS VDD;3,15,23,35 C123 C124 C132 C125 GND;10,22,30,42 R163 0.22UF 0.22UF 0.22UF 0.22UF D[0:15] SH2-8 R147 VDD;15,17,23,35,41,50,59,68,78,90,102,113,123,134,143 IRQ7 1/8W GND;13,21,36,42,51,55,60,69,79,91,103,114,124,126,135,144 A[0:23] SH2,3,5,7 74HC08 1/8W Figure 8-7 Microcontroller board schematic diagram, page 1 of 10 7900 Ventilator- 1503-0151-000 1-97...
Page 165: Figure 8-8 Microcontroller Board Schematic Diagram
I/O16 PWR_IN_EN I/O8 I/O15 RD_WR EXT_CS SH1,3,4,6 I/O9 I/O14 SH1,3 I/O10 I/O13 I/O11 I/O12 VDD;3,15,23,35 C162 C163 C167 C161 GND;10,22,30,42 0.22UF 0.22UF 0.22UF 0.22UF DSACK1 DSACK0 Figure 8-8 Microcontroller board schematic diagram, page 2 of 10 7900 Ventilator- 1503-0151-000 1-97...
Page 166: Figure 8-9 Microcontroller Board Schematic Diagram
I/O6 I/O17 IACK3 SIZ0 I/O7 I/O16 I/O8 I/O15 I/O9 I/O14 C128 C127 C136 C129 I/O10 I/O13 0.22UF 0.22UF 0.22UF 0.22UF SH1,2 I/O11 I/O12 VDD;3,15,23,35 GND;10,22,30,42 Figure 8-9 Microcontroller board schematic diagram, page 3 of 10 8-10 7900 Ventilator- 1503-0151-000 1-97...
Page 167: Figure 8-10 Microcontroller Board Schematic Diagram
XDOUT7 RESET SH1,5 XDOUT6 TXDB_340 XDOUT5 CNTRL_IACK6 XDOUT4 TXDA_340 XDOUT3 CHG_DISABLE_340 XDOUT2 XDOUT1 AC_LED_A AC_LED_C XDOUT0 SCLK_PLUS EXTERNAL SCLK_MINUS INTERFACE SDA1_INSP SDA2_EXP E2_POWER GIVON_RR XDOUT[0:7] Figure 8-10 Microcontroller board schematic diagram, page 4 of 10 7900 Ventilator- 1503-0151-000 1-97 8-11...
Page 168: Figure 8-11 Microcontroller Board Schematic Diagram
1/8W SDA1_INSP SDA1_IN 1/8W 74HC14 74HC14 2N7002 SDA1_OUT 74HC14 R131 4.99K R132 1/8W SDA2_EXP SDA2_IN 1/8W 74HC14 74HC14 2N7002 SDA2_OUT 74HC14 PWR_ENABLE E2_POWER 2N7002 74HC14 Figure 8-11 Microcontroller board schematic diagram, page 5 of 10 8-12 7900 Ventilator- 1503-0151-000 1-97...
Page 169: Figure 8-12 Microcontroller Board Schematic Diagram
0.1UF 2.26K 2.26K 1/8W ENCODER_DIRECTION MECH_VENT_EN 1/8W 1/8W SH1,4,9 R228 4.99K ENCODER_CLK CLKO LS7084 4.99K 1/8W RBIAS R227 C176 100K 0.1UF 1/8W 100PF 100PF 1/8W Figure 8-12 Microcontroller board schematic diagram, page 6 of 10 7900 Ventilator- 1503-0151-000 1-97 8-13...
Page 170: Figure 8-13 Microcontroller Board Schematic Diagram
VIDEO_WR VA15 IOWR VA15 VA[0:15] VIDEO_RD IORD VIDEO_MEMCS MEMCS R210 MEMWR R190 MEMRD 1/8W VCS0 VCS1 1/8W VCS2 VIDEO_READY READY VCS3 RESET RESET VCS4 MPUSEL Figure 8-13 Microcontroller board schematic diagram, page 7 of 10 8-14 7900 Ventilator- 1503-0151-000 1-97...
Page 171: Figure 8-14 Microcontroller Board Schematic Diagram
1/8W VOUT LM45B 1/8W 0.05AMP R109 2.2UF 2.21K 80/-20% MUX2_SEL 1/4W MUX1_SEL NOTE: TEMPERATURE MEASUREMENT CIRCUIT IS NOT INSTALLED MUX_A0 SCHEMATIC 7900 MICROCONTROLLER MUX_A1 MUX_A2 Figure 8-14 Microcontroller board schematic diagram, page 8 of 10 7900 Ventilator- 1503-0151-000 1-97 8-15...
Page 172: Figure 8-15 Microcontroller Board Schematic Diagram
1/8W R157 100K 1/8W HIGH HIPRES_SW_NC HI_DRIVE_PRES SH1,6 4.7UF TP11 PRESSURE 1/8W 1/8W C126 1/8W 74HC14 SWITCH MANIFOLD 0.01UF 3906 4.99K 210PCBM C134 0.1UF 1/8W Figure 8-15 Microcontroller board schematic diagram, page 9 of 10 8-16 7900 Ventilator- 1503-0151-000 1-97...
Page 173 OUT2 1.82K 0.1% 1/8W IN3+ OUT3 N15_FAIL IN3- IN4+ OUT4 IN4- 0.1% 1/8W DIN+ DOUT 33.2K 33.2K 0.1% 0.1% 1/8W 1/8W VREF 1.25V 0.01UF -15V Figure 8-16 Microcontroller board schematic diagram, page 10 of 10 7900 Ventilator- 1503-0151-000 1-97 8-17...
Page 174: Figure 8-17 Power Supply Board Schematic Diagram
1.5W 1/8W 15UF 13.7K 3904 1/8W MAIN_POWER_ON NOTE: INDICATES DEVICES THAT HAVE A HEAT SINK 1/8W 2.49K CHG_DISABLE 1/8W 1/8W 1/8W 10-26-95 BSS138 1/8W Figure 8-17 Power supply board schematic diagram, page 1 of 5 8-18 7900 Ventilator- 1503-0151-000 1-97...
Page 175 1/8W CR37 TC54VN4502 DL4004 [10.34/11.57V) BSS138 1/8W VIN OUT MIC29300-5.0BT VIN VOUT 52.3K CR20 1/8W 5248 100UF 100UF 100UF 4700UF 100UF 100UF REM_ON+ REM_ON- Figure 8-18 Power supply board schematic diagram, page 2 of 5 7900 Ventilator- 1503-0151-000 1-97 8-19...
Page 176 1/8W 0.01UF CR12 SMBJ16CA CR11 SMBJ10CA 0.01UF SIGNAL=CHAS_GND;5,6 4.99K 49.9K 1/8W 1/8W +15V -15V 0.1UF 0.1UF V_BATT I_BATT 4.99K 1/8W AD822AR 49.9K 1/8W 0.01UF Figure 8-19 Power supply board schematic diagram, page 3 of 5 8-20 7900 Ventilator- 1503-0151-000 1-97...
Page 177 0.1UF 0.1UF XDOUT7 SIGNAL=CHAS_GND;51,52 XDOUT6 XDOUT5 REM_ON+ 0.1UF 74HC14 XDOUT4 REM_ON- XDOUT3 XDOUT2 XDOUT1 74HC14 XDOUT0 IN14 IN13 0.1UF 0.1UF IN12 IN11 IN10 SP720 Figure 8-20 Power supply board schematic diagram, page 4 of 5 7900 Ventilator- 1503-0151-000 1-97 8-21...
Page 178 OUT2 0.22UF 100K 100K 1000PF 3.3UF 100V 1/8W ALARM 1/8W 200V TEST JUMPER 100K SIGNAL=VSW;14 1/8W SIGNAL=PGND;7 100K MC14001B SIGNAL=VSW;14 1/8W SIGNAL=PGND;7 0.1UF MC14001B Figure 8-21 Power supply board schematic diagram, page 5 of 5 8-22 7900 Ventilator- 1503-0151-000 1-97...
Page 179: 9/ Accessories, Miscellaneous Parts
9/ Accessories, Miscellaneous Parts 7900 Accessory and Bellows Mounting: Kit Accy Common Parts 1503-8001-000 Mounting plate assembly ABA Bellows assembly autoclaveable Diaphragm assembly Gasket, manifold O-rings Hoses GMS Vent interface (4) Flow transducer Adapter O 2 sensor O 2 sensor...
Page 180: O&M Manuals
9/ Accessories, Miscellaneous Parts O&M Manuals: Revision 1.5 Domestic 1503-0140-000 Deutsch 1503-0141-000 Francais 1503-0142-000 Espanol 1503-0143-000 Italiano 1503-0144-000 Japanese 1503-0145-000 Svenska 1503-0152-000 Revision 2.x Domestic 1503-0177-000 Deutsch 1503-0178-000 Francais 1503-0179-000 Espanol 1503-0180-000 Italiano 1503-0181-000 Japanese 1503-0182-000 Swedish 1503-0183-000 Danish 1503-0184-000 Polish 1503-0185-000 Hungarian...
Page 181 Cvr Chg Ohmeda Drive 06 00 PO Box 7550 Madison WI 53707-7550 1503 0151 000 03 97 A 16 04 19 Tel 1 608 221 1551 Printed in USA Fax 1 608 222 9147 ©Datex-Ohmeda, Inc. All rights reserved www.datex-ohmeda.com...

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