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Drager Savina 5.0 Repair Procedure
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Drager Savina 5.0 Repair Procedure

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Repair Procedures
Repair Procedures
The following repair procedures are described:
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Opening the unit
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Power pack
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O2 valve block
−
Motor Drive PCB
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Fan
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O2 Diaphragm PCB
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Bypass valve V1
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Expiratory valve V3
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Replacing the EEPROM
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Control PCB
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Pressure measuring unit
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Internal battery
Dräger Medical AG & Co. KGaA
Repair Procedures Savina Version 5.0
Page 1

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Summary of Contents for Drager Savina 5.0

  • Page 1 Repair Procedures Repair Procedures The following repair procedures are described: − Opening the unit − Power pack − O2 valve block − Motor Drive PCB − − O2 Diaphragm PCB − Bypass valve V1 − Expiratory valve V3 − Replacing the EEPROM −...

  • Page 2: Opening The Unit

    Repair Procedures Opening the unit For maintenance procedures according to PMS procedure, see Repair Instructions "Maintenance Procedures". Opening the unit As required, (see also Figure "Front view with front panel and Control PCB folded away" and Figure "Rear view of Savina with rear panel removed" in the "Schematics and Diagrams" section) Savina can be opened at the control unit and/or at the rear panel.
  • Page 3 Repair Procedures Opening the unit • Carefully pry the fuse (Rear view of the unit, fuse/1) off its holder using a small screwdriver or a similar tool. Fig.1 Rear view of the unit, fuse Electrostatic discharge may damage electrostatic sensitive devices. When handling electrostatic sensitive devices use a static-dissipative mat and a wrist strap.
  • Page 4 Repair Procedures Opening the unit Opening the operator control panel Hazardous voltage. Touching live components can lead to serious injury or death. Before opening the unit, unplug the power plug from the socket-outlet and remove the fuse (Rear view of the unit, fuse/1).
  • Page 5 Repair Procedures Opening the unit Electrostatic discharge may damage electrostatic sensitive devices. When handling electrostatic sensitive devices use a static-dissipative mat and a wrist strap. • Switch off the device. • Unplug power plug from socket-outlet. • Disconnect the O compressed gas supply.
  • Page 6 Repair Procedures Opening the unit • Remove the screws (Folding away the control unit/1) (one on the left and one on the right side). Fig.4 Folding away the control unit • Fold down the operator control panel forwards. Page 6 Dräger Medical AG &...
  • Page 7 Repair Procedures Opening the unit If necessary, for example to access the connectors of the power pack, the Control PCB can also be folded away. Fold away the Control PCB as described in the following. • Remove the screws (Folding away the Control PCB/1).
  • Page 8 Repair Procedures Opening the unit Removing the rear panel Hazardous voltage. Touching live components can lead to serious injury or death. Before opening the unit, unplug the power plug from the socket-outlet and remove the fuse (Rear view of the unit, fuse/1).
  • Page 9 Repair Procedures Opening the unit Electrostatic discharge may damage electrostatic sensitive devices. When handling electrostatic sensitive devices use a static-dissipative mat and a wrist strap. • Switch off the device. • Unplug power plug from socket-outlet. • Disconnect the O compressed gas supply.
  • Page 10 Repair Procedures Opening the unit • Remove the screws (Removing the rear panel/1). Fig.8 Removing the rear panel • Remove rear panel. Page 10 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 11 Repair Procedures Opening the unit When mounting the rear panel, make sure the hoses point to the left. Otherwise the hoses could buckle (which could lead to error message "O2 measurement"). Fig.9 Position of hoses Page 11 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...

  • Page 12: Power Pack

    Repair Procedures Power pack Power pack General information about the power pack In case of repair, replace complete power pack. Identification of the power pack's hardware version For identification, the power pack needs to be removed from the unit. Fig.10 Rear view of the unit, power pack pulled out a short way Page 12 Dräger Medical AG &...
  • Page 13 Repair Procedures Power pack The following illustrations show the labels of the power pack. The power pack with the Dräger part number 8413606 (SW version of power pack: "H-L") has been installed in all Savina units manufactured until approx. March 2003. As of April 2003, the power pack with Dräger part number 8414132 (as of SW version of power pack: "P") will be installed in Savina.
  • Page 14 Repair Procedures Power pack Measuring the supply voltages The power pack delivers the following supply voltages: +5 V) —15 V) +15 V) +24 V) +48 V) The +48 V are fed directly from the power pack to the Motor Drive PCB. The remaining voltages are fed to the Control PCB and from there to the other PCBs and component devices.
  • Page 15 Repair Procedures Power pack Voltage Pin assignment, connector X1 Test point Battery The battery voltage must be measured directly at the battery (see Maintenance Procedure, chapter "Replacing the internal rechargeable batteries"). It can also be measured between the battery fuse and the external voltage supply connection (see also "Repair Information/Error Events", chapter "Starting aid for charging of internal battery").
  • Page 16 Repair Procedures Power pack Replacing the power pack Switch off the device. Unplug the power plug of the device from the socket-outlet. Disconnect the connector of the (optional) external battery from the device. Carefully pry the fuse "F3" (see Fig: Rear view of the unit, fuse "F3") off its holder using a small screwdriver or a similar tool.
  • Page 17 Repair Procedures Power pack Squeeze the filter clamps (Rear view of the unit, filter cover/1) and remove the filter cover. Fig.14 Rear view of the unit, filter cover Page 17 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 18 Repair Procedures Power pack Remove the screws (Rear view of the unit; rear panel/1). Fig.15 Rear view of the unit; rear panel Remove the rear panel and put it aside. Page 18 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 19 Repair Procedures Power pack Remove the screw (see Fig: Rear view of the unit; power pack). Fig.16 Rear view of the unit; power pack Page 19 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 20 Repair Procedures Power pack The screws of the front frame are secured with Loctite. Using an Allen key (size 3 mm) loosen the Allen screw (Bottom view of the control unit; mounting of the front frame/1) on the front frame a few turns (Note: older units have slotted-head screws!).
  • Page 21 Repair Procedures Power pack Push the front frame away from the control unit. Fig.18 Front view of the unit; front frame Page 21 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 22 Repair Procedures Power pack Slacken (but do not remove) the screws (Left- and right-hand side view of the device/2). Using one hand, secure the control unit from falling down, remove the screws and plates (Left- and right-hand side view of the device/1) from the left-hand and right-hand sides of the device and put the control unit aside.
  • Page 23 Repair Procedures Power pack Lift the control unit slightly up, unlock the socket's lock (control unit; cable connector/1) and pull out the cable connector. Disconnect the cable connector (control unit; cable connector/2) from the Control PCB and put the control unit aside. Fig.20 control unit;...
  • Page 24 Repair Procedures Power pack Remove screws and washers (Left-hand and right-hand front views; mounting the frame/1) on the left-hand and right-hand sides of the frame. Fig.21 Left-hand and right-hand front views; mounting the frame Carefully pull the frame slightly out of the housing, lift the frame slightly up and fold the frame down to the front with the help of the frame guide.
  • Page 25 Repair Procedures Power pack Disconnect all cable connectors (Front view of the power pack; cable connections/1) from the power pack. Fig.22 Front view of the power pack; cable connections Remove the faulty power pack from the device (at the rear) and put it aside. Page 25 Dräger Medical AG &...
  • Page 26 Repair Procedures Power pack Insert the new power pack into the device (at the rear), and secure the power pack to the device using only one screw (at the top right), see Fig: Power pack; attachment. Fig.23 Power pack; attachment Page 26 Dräger Medical AG &...
  • Page 27 Repair Procedures Power pack Cables are not coded. Incorrectly connected cables can damage the power pack and the Control PCB. When connecting cables, make sure the cable connector with the larger conductor cross section is connected to the socket at the bottom right of the power pack! Check the following figure for the correct configuration of connections.
  • Page 28 Repair Procedures Power pack Fold the frame up and push to the rear. Risk of squeezing of or damage to the cables due to improper mounting of the frame. When securing the frame, make sure no cable is squeezed or damaged. Since 2002, the transition from control unit to housing has been completely covered with a special sealing rubber in order to improve the electrical insulation at the bottom of the frame.
  • Page 29 Repair Procedures Power pack Secure the frame to the device using screws and washers (Left-hand and right-hand front views; mounting the frame/1). Fig.25 Left-hand and right-hand front views; mounting the frame Page 29 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 30 Repair Procedures Power pack Connect the cable connector (Detail of the control unit; cable connector/1) to the socket on the control unit, and lock the cable connector in the socket. Connect the cable connector of the control unit (Detail of the control unit; cable connector/2) to the socket on the Control PCB.
  • Page 31 Repair Procedures Power pack Secure the control unit to the device using the plates and screws (Left- and right-hand side view of the device; plates/1). Tighten the screws (Left- and right-hand side view of the device; plates/2) at the left-hand and right-hand sides of the device.
  • Page 32 Repair Procedures Power pack Slide the front frame over the control unit. Secure the front frame to the control unit using the Allen screws (Bottom view of the control unit; mounting of the front frame/1). Apply Loctite 221 on the heads of the Allen screws. Fig.28 Bottom view of the control unit;...
  • Page 33 Repair Procedures Power pack Plug the power plug of the device into the socket-outlet. Press the fuse "F3" into its holder (Note: the fuse is located on the back of the device). Switch on unit. Carry out an electrical safety test as per PMS procedure. For the USA and Canada: test according to CAN/CSA-22.2 No.
  • Page 34 Repair Procedures O2 valve block O2 valve block Checking the O2 output of the O2 valve block Switch the unit off with the ON/OFF switch. Unplug the power plug of the device from the socket-outlet. Pry the fuse "F3" (external battery) off its holder on the rear panel of the unit. Fig.29 Rear view of the unit, fuse Page 34...
  • Page 35 Repair Procedures O2 valve block Push the clamps (Rear view of the unit, filter cover/1) of the filter cover in, lift the filter cover slightly at its underside, and remove the filter cover from the cover. Fig.30 Rear view of the unit, filter cover Page 35 Dräger Medical AG &...
  • Page 36 Repair Procedures O2 valve block Remove the screws (Rear panel/1) and put the rear panel aside. Fig.31 Rear panel Page 36 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 37 Repair Procedures O2 valve block Remove the filter (Rear view of the unit, filter box/1). Pull out the filter box (Rear view of the unit, filter box/2). Fig.32 Rear view of the unit, filter box Page 37 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 38 Repair Procedures O2 valve block Carefully remove the TSI sensor (TSI sensor) from the plug-in module and place the TSI- Sensor in direction of the front panel. Fig.33 TSI sensor Page 38 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 39 Repair Procedures O2 valve block Unscrew, for example, the "NIST connector" (see Fig: connector; NIST connector/1) from the O2 valve block using plastic-jaw pliers (Note: the NIST, DIN, Air Liquide, or DIS connectors have washers that need to be replaced after each removal of the connector!).
  • Page 40 Repair Procedures O2 valve block Remove the screws (O2 valve block, screws/1) from the O2 valve block. Fig.35 O2 valve block, screws Page 40 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 41 Repair Procedures O2 valve block Pull the O2 valve block out a little, tilt it and disconnect all silicone hoses from the O2 valve block. Fig.36 O2 valve block, silicone hoses Page 41 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 42 Repair Procedures O2 valve block Connect the following test set-up to the O2 valve block. Fig.37 Test set-up Connect the O2 gas supply to the O2 valve block. Insert the fuse "F3" (external battery) into its holder on the rear panel of the unit. Plug the power plug of the device into the socket-outlet.
  • Page 43 Repair Procedures O2 valve block Hazardous voltage. Touching live components can lead to serious injury or death. Start the unit in DrägerService mode by pressing and holding the "Config" and "Dim-up/dim- down" keys while switching on the unit. Call up "test step 5". Select valves (1 to 8) one after the other, read the pressure on the display, round off the pressure value, and compare the flow with the flow values listed in the following tables (Note: The tolerance for all flows is +10%!).
  • Page 44 Repair Procedures O2 valve block Read the pressure on the display, "O2 supply pressure: 4730 mbar". Convert the pressure value to bar and round off to one decimal place after the decimal point, e.g., 4730 mbar to 4.7 bar. Read the flow on the flowmeter tube, and compare the reading with the value given in the table.
  • Page 45 Repair Procedures O2 valve block Absolute pressure value in bar Valve 24.9 l 25.9 l 26.9 l 27.9 l 28.9 l 29.9 l 30.9 l 31.9 l 32.9 l 33.9 l 24.9 l 25.9 l 26.9 l 27.9 l 28.9 l 29.9 l 30.9 l 31.9 l 32.9 l 33.9 l...
  • Page 46 Repair Procedures O2 valve block Absolute pressure value in bar Valve 34.8 l 35.8 l 36.8 l 37.8 l 38.8 l 39.8 l 40.8 l 41.8 l 42.8 l 43.8 l 34.8 l 35.8 l 36.8 l 37.8 l 38.8 l 39.8 l 40.8 l 41.8 l 42.8 l 43.8 l...
  • Page 47 Repair Procedures O2 valve block Absolute pressure value in bar Valve 44.8 l 45.8 l 46.8 l 47.8 l 48.8 l 49.8 l 50.8 l 51.8 l 52.8 l 53.8 l 44.8 l 45.8 l 46.8 l 47.8 l 48.8 l 49.8 l 50.8 l 51.8 l 52.8 l 53.8 l 44.8 l...
  • Page 48 Repair Procedures O2 valve block Absolute pressure value in bar Valve 54.8 l 55.8 l 56.8 l 57.7 l 58.7 l 59.7 l 54.8 l 55.8 l 56.8 l 57.7 l 58.7 l 59.7 l 54.8 l 55.8 l 56.8 l 57.7 l 58.7 l 59.7 l 54.8 l 55.8 l 56.8 l 57.7 l 58.7 l 59.7 l 21.9 l...
  • Page 49 Repair Procedures O2 valve block With an intact O2 valve block (no valve is triggered) the permissible leakage flow is less than or equal to 8 ml at 3 bar relative. (Note: Absolute pressure = relative pressure + ambient pressure) If all values are OK, assemble the unit as follows: Switch off the device.
  • Page 50 Repair Procedures O2 valve block Insert the TSI sensor into the holder and push the TSI sensor firmly to the right. Fig.38 TSI sensor Page 50 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 51 Repair Procedures O2 valve block Connect the silicone hoses to the O2 valve block, see O2 valve block tubing. Fig.39 O2 valve block tubing Number Color Connection Expiratory pressure sensor blue Blower unit blue Restrictor for O2 sensor mount transparent (small) Nebulizer transparent (large) Plug-in unit...
  • Page 52 Repair Procedures O2 valve block Place the O2 valve block into its mounting position. Secure the O2 valve block to the unit using the screws (O2 valve block/1) (Note: Mount also the earthing to the right screw). Fig.40 O2 valve block Page 52 Dräger Medical AG &...
  • Page 53 Repair Procedures O2 valve block Mount the connector to the O2 valve block using plastic-jaw pliers (Note: the NIST, DIN, Air Liquide, or DIS connectors have washers that need to be replaced after each removal of the connector!). Fig.41 Connection Page 53 Dräger Medical AG &...
  • Page 54 Repair Procedures O2 valve block Push the filter box (Rear view of the unit, filter box/2) into the guide of the unit. Insert the filter (Rear view of the unit, filter box/1) into the filter box. Fig.42 Rear view of the unit, filter box Page 54 Dräger Medical AG &...
  • Page 55 Repair Procedures O2 valve block Use the screws (Rear panel/1) to secure the rear panel to the unit. Fig.43 Rear panel Page 55 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 56 Repair Procedures O2 valve block Squeeze the clamps (Filter cover/1), push the filter cover with the grooves under the housing cover, and fit the filter cover to the recesses on the rear panel using the clamps. Fig.44 Filter cover Insert the fuse "F3" (external battery) into its holder on the rear panel of the unit. Plug the power plug of the device into the socket-outlet.
  • Page 57 Repair Procedures O2 valve block Check the electrical safety and the correct functioning of the device as described in the PMS procedure (Test Certificate). Enter previously noted customer-specific parameters in the unit. Page 57 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 58 Repair Procedures Motor Drive PCB Motor Drive PCB The PCB is on the right behind the Control PCB (see also "Schematics and Diagrams", figure "Front view with front panel and Control PCB folded away"). Motor Drive PCB Controller PCB Fuse 6.3 AT (in +48 V line) Power pack To blower motor...
  • Page 59 Repair Procedures Motor Drive PCB Pin assignment of the Motor Drive PCB Connector S2 (to Control PCB/power Connector S1 (to blower motor) pack) Enable Motor phase 3 (L3) Operating voltage (+Ub, +48 V) Supply to Hall sensor system (+U-Hall) Not assigned Hall signal 2 (RLG2) Target speed (0 to +4.75 V) Hall signal 1 (RLG1)
  • Page 60 Repair Procedures The fan is on the left behind the Control PCB (see also "Schematics and Diagrams", figure "Front view with front panel and Control PCB folded away"). Pin assignment of the fan Connector (to Control PCB) Operating voltage (+Ub, +24 V) Speed signal Speed setpoint (pulse width modulation) Page 60...
  • Page 61 Repair Procedures O2 Diaphragm PCB O2 Diaphragm PCB Replacing the O2 Diaphragm PCB The O2 Diaphragm PCB holds the mounts for the O sensors and the measurement electronics. It is located directly behind the O sensors. Replacement procedure: • Switch off the device. •...
  • Page 62 Repair Procedures O2 Diaphragm PCB • Remove the cover sensors cover/1) of the O sensors. Fig.47 sensors cover • Remove the O sensors. • Remove the screws of the plastic frame. Fig.48 sensors, plastic frame Page 62 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 63 Repair Procedures O2 Diaphragm PCB • Remove the plastic frame. The O block has tubes and cable connections. These tubes and cable connections could get damaged when removing the O2 block. Remove the O block from the unit very carefully. •...
  • Page 64 Repair Procedures O2 Diaphragm PCB • Remove the fixing screws from the O2 Diaphragm PCB. Fig.50 O2 Diaphragm PCB, position of the fixing screws • Mount the new 2 Diaphragm PCB • Reassemble the unit (do not mount the O sensors yet).
  • Page 65 Repair Procedures O2 Diaphragm PCB Pin assignment of the O2 Diaphragm PCB Only those contacts are listed for which there is a measurement result. For the location of connectors, see also "Schematics and Diagrams", "O Diaphragm PCB". Connectors X1, X2 sensors connection Connector X3 NTC in the inspiration block...
  • Page 66 Repair Procedures O2 Diaphragm PCB Connector X4 The values of the following signals can be read out in DrägerService mode (see DrägerService mode, "Test Step 17" to "Test Step 19"). V_REF_O2 V_TEMP_O2 V_TEMP_AIR VCC+15V_O2 V_FIO2_1 V_FIO2_1 V_FIO2_2 V_FIO2_2 Page 66 Dräger Medical AG &...
  • Page 67 Repair Procedures Bypass valve V1 Bypass valve V1 After replacing the bypass valve, it is necessary to set the calibration class stated on the new bypass valve (see DrägerService Mode, "Test Step 15") and to transfer it to the rear panel (new label).

  • Page 68: Replacing The Eeprom

    Repair Procedures Replacing the EEPROM Replacing the EEPROM Read the following information before replacing the EEPROM: Do not replace the EEPROM and the RTC on the Control PCB at the same time. Otherwise the recorded operating hours will be lost. If you need to replace both components, do it in sequence, that is, complete the replacement of one component first before starting the next one.
  • Page 69 Repair Procedures Replacing the EEPROM The information stored in the EEPROM includes operating hours, software options (as of SW 1.01), device ID (as of SW 1.01), language version, volume, contrast, baud rate, and measured value display. This information must be read out and written down before replacing the EEPROM.
  • Page 70 Repair Procedures Replacing the EEPROM • Install brand-new EEPROM. • Assemble the unit. • Insert the "F3" fuse (internal batteries). • Switch on unit. A device malfunction is generated. • Adjust settings (as written down), time, and date on the unit. Setting the clock will generate a new device ID (see also "Error when updating from SW 1.00 to 1.10"...
  • Page 71 Repair Procedures Replacing the EEPROM • If "options" are lost during repair, write down the device ID and serial number and send them to the product management of the BU Intensive Care: Lars Hansen Stefan Mixa Fax: (++49) 451/882 4089 Fax: (++49) 451/882 4089 Phone: (++49) 451/882 3492 Phone: (++49) 451/882 4798...

  • Page 72: Control Pcb

    Repair Procedures Control PCB Control PCB General Information About the Control PCB Fig.52 View of the Control PCB Page 72 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 73 Repair Procedures Control PCB Replacing the Control PCB Read the following information before replacing the Control PCB: Remove EEPROM and RTC from old Control PCB and install on new Control PCB. If SW version 1.00 is installed on the unit, update it to SW version 1.01 or higher after replacement (see also "Error when updating from SW 1.00 to 1.10"...
  • Page 74 Repair Procedures Control PCB • Remove EEPROM and RTC from old Control PCB and install on new Control PCB. (Note: all options will be lost if the EEPROM is not installed on the new Control PCB!). • Mount the new Control PCB. •...
  • Page 75 Repair Procedures Control PCB • Start DrägerService mode "Test 27". • Calibrate the absolute pressure sensors in "test step 27". • Use an external pressure gauge to measure the current ambient pressure, and enter the value in the "set ambient pressure" menu item. •...
  • Page 76 Repair Procedures Control PCB • Select page 1/4 and check contrast and sound volume, adjust if necessary. • Select page 2/4 and carry out a manual O2 calibration. • Select page 3/4 and check language, time and date, adjust if necessary. •...
  • Page 77 Repair Procedures Pressure measuring unit Pressure measuring unit General information about the pressure measuring unit Testing the pressure sensors Replacing the pressure sensor General information about the pressure measuring unit The pressure measuring unit is available in several versions. The pressure measuring units listed below are not interchangeable! Page 77 Dräger Medical AG &...
  • Page 78 Repair Procedures Pressure measuring unit First version Second version Third version - Pressure sensor with ground - Pressure sensor with ground - Pressure sensor without connection connection ground connection - each pressure sensor has its - each pressure sensor has its - Pressure sensors have a own connecting cable own connecting cable...
  • Page 79 Repair Procedures Pressure measuring unit First and second version: The pressure sensors of the first and second version are identical. Third version: New pressure sensors have been installed in the devices since the first quarter of 2003. They are not compatible with the first and second version. Refer to the spare parts list! Page 79 Dräger Medical AG &...
  • Page 80 Repair Procedures Pressure measuring unit Connecting the pressure sensors and calibration valves Fig.53 Detail of the Control PCB; connecting pressure sensors Page 80 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 81 Repair Procedures Pressure measuring unit The "inspiratory" pressure sensor (see Fig. Pressure measuring unit/1) and the "expiratory" pressure sensor (see Fig. Pressure measuring unit/2) are mounted on the pressure measuring unit. Fig.54 Pressure measuring unit Page 81 Dräger Medical AG & Co. KGaA Repair Procedures Savina Version 5.0...
  • Page 82 Repair Procedures Pressure measuring unit Testing the pressure sensors The following example describes the "inspiratory" pressure sensor test. (Note: in order to test the "expiratory" pressure sensor, the test hose must be connected to the expiratory connector of the pressure measuring unit!). Switch off the device.
  • Page 83 Repair Procedures Pressure measuring unit Prepare the following test set-up using a syringe, 7901541, a pressure gauge (measuring range -30 to 120 mbar), 7910722, a Y-piece (plastic), 2M12754, and a reducer for log devices, M22286. Connect the silicone hose to the inspiratory socket of the pressure measuring unit (Fig. Left, test set-up;...
  • Page 84 Repair Procedures Pressure measuring unit Fig.56 Block diagram of the test set-up Insert the fuse "F3" into its holder. Plug the mains plug into the socket outlet. Switch the device to DrägerService mode. Open "test step 23" (menu "Calibrate insp. and exp. airway pressure sensors"). Carry out offset "Paw insp.
  • Page 85 Repair Procedures Pressure measuring unit Start DrägerService mode "Test 12". Using the syringe, generate the following pressures in sequence: 20 mbar, 40 mbar, 60 mbar, 80 mbar, and 100 mbar (Note: read each generated pressure at the external pressure gauge and compare them with the values shown on the display). The display shows the pressure levels with a tolerance of +/- 2 mbar (Note: read the "Paw insp"...
  • Page 86 Repair Procedures Pressure measuring unit As soon as the "100 mbar" pressure is reached, switch "Insp. cal valve" to "ON". The "inspiratory" pressure sensor vents to 0 mbar +/-1 mbar (ambient pressure). Fig.58 Display (venting of the pressure sensor) Switch off the device. Take power plug out of mains socket.
  • Page 87 Repair Procedures Pressure measuring unit Reconnect the previously disconnected silicone hose of the device to the inspiratory socket of the pressure measuring unit. Secure the rear panel to the device. Secure the filter frame to the device. Plug the power plug of the device into the socket-outlet. Switch on unit.
  • Page 88 Repair Procedures Pressure measuring unit Replacing the pressure sensor Switch off the device. Take power plug out of mains socket. Pull the fuse "F3" out of its holder on the rear panel of the device. Open the device, see Opening the operator control panel.
  • Page 89 Repair Procedures Pressure measuring unit Make a note of the colors of the cables that are connected to the faulty pressure sensor, then unsolder the cables from the connectors of the faulty pressure sensor. The following steps describe how to replace the "inspiratory" pressure sensor. Replacement of the "expiratory"...
  • Page 90 Repair Procedures Pressure measuring unit Remove the faulty pressure sensor and make sure that both sealings are still on the pressure measuring unit after removing the faulty pressure sensor. Secure the new pressure sensor and both sealings to the pressure measuring unit using the screws and washers (Fig.
  • Page 91 Repair Procedures Pressure measuring unit Solder the cables to the connections of the new pressure sensor according to the color coding recorded in a previous step. Check that the hoses to the pressure measuring unit are undamaged and are connected securely to the connectors.
  • Page 92 Repair Procedures Pressure measuring unit Secure the pressure measuring unit to the device using the screws and washers (Fig. Fitting the pressure measuring unit/1). Fig.63 Fitting the pressure measuring unit Check the pressure sensor (inspiratory) or the pressure sensor (expiratory), see Testing the pressure sensors.

  • Page 93: Internal Battery

    Repair Procedures Internal battery Internal battery General The internal battery can be used to bridge a short power gap, e.g. when transporting a patient. When the device is powered from the internal battery, the following messages/alarms are generated until the internal battery is discharged: −...
  • Page 94 Repair Procedures General Savina with software version 2.10 or higher Savina with software version 2.10 or higher has an improved charging management: - additional capacity indication of internal battery by a battery symbol on the display (Note: the battery symbol is only visible if the internal battery is activated.) - energy saving mode, i.e.
  • Page 95 Repair Procedures General The total running time of approximately one hour can be reached under the following conditions: − the internal battery is fully charged (at east 6 hours of charging time) and has been in the device for no longer than two years −...
  • Page 96 Repair Procedures General Approximately 80% of the energy are required for the operation of the blower. Especially by increasing the parameters FlowAcc, Pinsp, and VT up to the maximum capacity of the Savina will reduce the operating time with the internal battery to less than 30 minutes.
  • Page 97 Repair Procedures General For storage times longer than two (2) weeks, always remove the fuse for the internal battery (on back of the device). After a complete discharge, the internal battery needs to be recharged. Completely discharged internal batteries that are stored over a longer period of time will suffer damage. If an internal battery is completely discharged several times, it could be irreversibly damaged and, if that is the case, it can no longer be recharged by the Savina.