Puritan Bennett GoodKnight 425 Service Manual
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Puritan Bennett GoodKnight 425 Service Manual

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GoodKnight
425
®
GoodKnight
425ST
®
SERVICE MANUAL
P/N: M-145MAT00-20
Revision A

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Summary of Contents for Puritan Bennett GoodKnight 425

  • Page 1 GoodKnight ® GoodKnight 425ST ® SERVICE MANUAL P/N: M-145MAT00-20 Revision A...
  • Page 3 This document is the property of NELLCOR PURITAN BENNETT, Inc and is distributed on the express condition that it is neither divulged nor reproduced in part or in full by anyone other than NELLCOR PURITAN BENNETT, Inc with- out prior written agreement, and no right is granted to divulge or use any information contained in this document.

  • Page 4: Preface

    Service Manual PREFACE This manual provides information necessary to service the GoodKnight 425 and the GoodKnight 425ST Respiratory System. This information is intended for use by technicians or personnel quali- fied to repair and service medical equipment. The information is not exhaustive and may not be ap- plicable to future models.

  • Page 5: Revision List

    GoodKnight 425 / 425ST Service Manual REVISION LIST OF GoodKnight 425 / 425ST Service Manual This list of effective pages represents manual P/N M-145MAT00-20, revision A. Revision Description Date Initial Release. 05/2004 Effective Pages Revision Effective Pages Revision All pages Federal law restricts this device for sale by or on the order of a physician.

  • Page 6: Table Of Contents

    5) Pressure stability 6) Dynamic resistance B. USING A HUMIDIFIER C. SYMBOLS D. CLEANING INSTRUCTIONS 1) GoodKnight 425 / 425ST 2) Air filter DISPOSAL OF THE DEVICE AT THE END OF ITS LIFETIME II - THEORY OF OPERATION II-1 A. GENERAL DESCRIPTION...
  • Page 7 GoodKnight 425 / 425ST Service Manual B. ELETRICAL DIAGRAM II-5 1) General Block diagram II-5 2) Micro-controller II-6 3) Pressure measurement chain block diagram II-7 4) Flow measurement chain block diagram II-7 5) Temperature measurement II-8 6) Serial Link II-8...
  • Page 8 GoodKnight 425 / 425ST Service Manual P/N: M-145MAT00-20 Rev. A - Page Rev.A...

  • Page 9: I - General Information

    GoodKnight 425 / 425ST Service Manual I - GENERAL INFORMATION P/N: M-145MAT00-20 Rev. A - Page Rev. A...

  • Page 10: Specifications

    GoodKnight 425 / 425ST Service Manual A. SPECIFICATIONS 1) Performances GoodKnight 425 and GoodKnight 425ST Ä Pressure adjustment range IPAP: 3 to 25 cmH O in 0.5 cmH O increments (see note 1) EPAP: 3 to PIP (maximum 20 cmH Ä...

  • Page 11: Electrical Specifications

    GoodKnight 425 / 425ST Service Manual 2) Electrical specifications Power supply Ä External Power Supply Class II 100-240 VAC 50/60 Hz—13VCC 4A Goodknight Ä Consumption 40 VA max. Ä Current consumption 1.1A @ 25cmH O with 4 mm leak 3) Environmental specifications Ä...

  • Page 12: Dynamic Resistance

    1,26 0,51 B. USING A HUMIDIFIER A heating or non-heating humidifier may be used with the GoodKnight 425 / 425ST on the condition that the following warnings are noted. WARNING You are strongly advised to read the manufacturer’s recommendations for the humidi- fier before use.

  • Page 13: Symbols

    GoodKnight 425 / 425ST Service Manual C. SYMBOLS SYMBOLS DEFINITIONS Alternating current Direct current Class 2 Equipment Type B Warning ! Consult instructions before using this unit. On / Off Access to settings Ramp RS 232 Increase or decrease the adjust-...

  • Page 14: Cleaning Instructions

    GoodKnight 425 / 425ST Service Manual D. CLEANING INSTRUCTIONS 1) GoodKnight 425 / 425ST Frequency As necessary How to clean Wipe with damp cloth moistened with warm, soapy water. Wipe dry. WARNING Unplug the unit from all electrical power sources before cleaning. Do not allow water to enter the unit through any opening.

  • Page 15: Theory Of Operation

    GoodKnight 425 / 425ST Service Manual II - THEORY OF OPERATION P/N: M-145MAT00-20 Rev. A - Page Rev.A II-1...

  • Page 16: General Description

    GoodKnight 425 / 425ST Service Manual A. General description 1) General design synopsis Voltage Patient Patient Interfac Inte rface Main Power AC Power AC Reference Flow Flow nal Module Flow filtered External Module C/DC AC/DC Flow direct Sensor Pressure otection...

  • Page 17: Description

    Some functions are hardware-controlled, some are software-controlled and others are a mix- ture of hardware and software. The GoodKnight 425 BiLevel is a BiLevel positive airway pressure device used in the treat- ment of obstructive sleep apnea or for the titration in the sleep lab of a patient having obstruc- tive sleep apnea.

  • Page 18: Temperature Sensor

    GoodKnight 425 / 425ST Service Manual 5) Temperature Sensor The stator of the blower is fitted with a temperature sensor which will protect the system against the overheating of the blower in the eventuality of a problem. The GoodKnight BiLevel will stop working if the temperature goes above 95°C +/-5°C during 10 seconds.

  • Page 19: Eletrical Diagram

    GoodKnight 425 / 425ST Service Manual B. ELECTRICAL DIAGRAM 1) General block diagram 1.1.2 Power Supply Main Power Serial Link 1.1.3 External Power Supply External Module Isolation AC/DC Barrier 100 – 264 Vac 1.1.1.1 13Vcc / 24W 13Vcc-4A Interface Serial Link...

  • Page 20: Micro-Controller

    GoodKnight 425 / 425ST Service Manual 2) Micro-controller unit block diagram a) Micro-Master Data µC MAX691 Software Memory MASTER Memory SRAM 64 ko 64 ko Reset Reset A0-7 AD0 – 7 D0 – 7 Multiplexer b) Micro-Motor µC Motor Interfaces...
  • Page 21 GoodKnight 425 / 425ST Service Manual 3) Pressure measurement chain µC Pressure Filter RC MASTER Lowpass Follower Sensor Fc = 152 Hz MOTOR Patient Tube 4) Flow measurement chain Flow Offset Gain Amplifier Sensor differential Adjustment Adjustment Linearity G = 40...

  • Page 22: Temperature Measurement

    GoodKnight 425 / 425ST Service Manual 5) Temperature measurement Blower Linearity Follower µC Master 6) Serial Link µC Interface Connector RS232 MASTER RS232 P30/RxD P31/TxD P/N: M-145MAT00-20 Rev. A - Page Rev.A II-8...

  • Page 23: Service And Repair

    GoodKnight 425 / 425 ST Service Manual III - SERVICE AND REPAIR P/N: M-145MAT00-20 Rev. A - Page Rev.A III-1...
  • Page 24 GoodKnight 425 / 425 ST Service Manual This section describes how to service the individual subassembly of the GoodKnight 425 and 425ST Cpap System. It includes instructions where applicable, for removal, disassem- bly, calibration, re-assembly and installation. WARNING The GK 425 and 425ST Cpap System is electrically powered. To prevent seri- ous injury or death, follow standard safety procedures.

  • Page 25: Performance Verification

    GoodKnight 425 / 425 ST Service Manual A. PERFORMANCE VERIFICATION 1) General information The performance verification should be carried out for any one of the following reasons: to determine the cause of operational failure, · to check the overall operation of the GK 425/425ST system after repair, ·...
  • Page 26 GoodKnight 425 / 425 ST Service Manual 4) Preparation for testing Pressure meter PTS 2000 P/N: 4-076185-00 a - Verification of the pressure Coupling Test Kit with 4 mm leak P/N: M-212430-02 (including coupling) Patient tube M-261000-27 Figure 3-1 b - Verification of the flow measurement chain...
  • Page 27 5-a) Preparation - Set the material as shown on figure 3.1 page III-4 - Connect the GoodKnight 425/425ST to your PC, - Open the Silverlining 3 software, - The following menu appears, Click on "CPAP or BiLevel connection "...
  • Page 28 GoodKnight 425 / 425 ST Service Manual - Press the three following keys of your computer keyboard simultaneously: Control - The following screen appears: Note: In some case, depending of the computer, the combination of key (ctrl, alt, F9) does not operates.

  • Page 29: 5-B) Pressure Verification And Calibration Iii-7

    GoodKnight 425 / 425 ST Service Manual - Click on “Calibrations” and the following screen appears, " Menu "Pressure/Pression Setting cursor 5-b) Pressure Verification and Calibration -Click on the button "14 cmH O" and verify that the pressure meter is reading: 14 cmH O + 0,5 .
  • Page 30 GoodKnight 425 / 425 ST Service Manual 5-c) Verification of the flow measurement chain Prepare the unit under testing as show in the figure 3.2 page III-4 " " Menu Flow/Débit Setting cursor -Set the pressure with 14 cmH -BLOCK the calibrated output.
  • Page 31 GoodKnight 425 / 425 ST Service Manual 5-d) Verification of the ramp Click on the button "Test R" (Test of Ramp). The unit is set with a 5 minutes ramp, start pres- sure 3 cmH O , end pressure 20 cmH...
  • Page 32 GoodKnight 425 / 425 ST Service Manual 6) Performance verification with Keypad 6-a) Verification of the pressure without computer Set the material as shown on figure 3.1 page III-4 NOTE According to the settings limitation it will not be possible to verify the pressure higher than 20 cmH O.
  • Page 33 GoodKnight 425 / 425 ST Service Manual Action Key(s) Display Check the measured value on the pressure meter, the value must be 14 cmH O ± 0.5. If yes, go to point #12 If not, go to point #8 #8-Press on the two keys opposite and keep them Hidden Key depressed for 2 seconds.
  • Page 34 GoodKnight 425 / 425 ST Service Manual 6-b) Verification of the ramp without computer Realise the test set up figure 3.1 page III-4 Action Key(s) Display #1 to #5-Follow steps #1 to # 5 according to page XX X III-10 and set pressure P= 20 cmH O and then- press on the key opposite.
  • Page 35 GoodKnight 425 / 425 ST Service Manual 6-c) Verification of the back-up frequency without computer Realise the test set up figure 3.1 page III-4 Action Key(s) Display #1-Connect the unit on the main power (via the external power supply), XX.XX is displayed.
  • Page 36 GoodKnight 425 / 425 ST Service Manual 7) Configuration with factory settings a) With the computer When you select the “Reprogramming device” menu (see page III-6) and you click on “OK”, the following two operations occur: -The reconfiguration erases all recorded data,...
  • Page 37 9) Service hour meters The GoodKnight 425/425ST has two additional “tools” to help you in planning the maintenance of your device. These two meters can be customized (choice of the name) and can be reset as necessary.
  • Page 38 GoodKnight 425 / 425 ST Service Manual 10) Setting the clock with the keypad. Key(s) Display Action #1-The device is in stand-by mode (the clock is displayed). Press the first key opposite and keep depressed. Then press the second key opposite and release the two keys simultaneously.
  • Page 39 GoodKnight 425 / 425 ST Service Manual Personal Notes P/N: M-145MAT00-20 Rev. A - Page Rev.A III-17...
  • Page 40 GoodKnight 425 / 425 ST Service Manual B. CALIBRATION PROCEDURE 1) Equipment required a calibrated pressure meter a calibrated leak M-BH210 and a connection tube M-213530-05, a patient circuit M-261000-27, a test kit M-212430-02 NOTE The calibration pressure mode is accessed via the keypad.
  • Page 41 GoodKnight 425 / 425 ST Service Manual 2) Pressure sensor calibration Connect a patient circuit and a pressure meter as shown in figure 3-1 on page III-4 The pressure sensor calibration can be done with a computer and the Technical Menu of the software Silverlining (procedure described III-7), or with the keypad (procedure described page III-10).
  • Page 42 GoodKnight 425 / 425 ST Service Manual 3) Flow sensor calibration 3-a) Set up material 1-Remove the top housing (refer to the disassembly section page III-22), 2-Locate on the MCU board the trimmers TR3 and TR4, 3-Realise the test set up figure 3.1 page III-4 4-Connect the unit to the computer, 5-Follow the steps described page III-5 to III-6 and click on “Calibrations/Performances”,...
  • Page 43 GoodKnight 425 / 425 ST Service Manual -b) Calibration CAUTION Allow to warm up for 1/2 hour with a set pressure of 14cmH O, unit in Cpap mode, before carrying out the pressure calibration. 1-Replace the test kit with the calibrated output (figure 3.2 page III-4) and block the output 2-With the mouse, click on the setting cursor of the menu “Flow/Débit”...
  • Page 44 GoodKnight 425 / 425 ST Service Manual C. DISASSEMBLY Material : A Torx T10 screwdriver, A grounded wrist strap, A grounded conductive mat. WARNING The GK 425/425ST BiLevel System is electrically powered. To prevent serious injury or death, follow standard safety procedures. Ensure that power has been disconnected from the unit before servicing any component.
  • Page 45 GoodKnight 425 / 425 ST Service Manual Internal Frame assembly Bottom Housing Housing Inlet baffle foam P/N: M-145MAT00-20 Rev. A - Page Rev.A III-23...
  • Page 46 GoodKnight 425 / 425 ST Service Manual D. TROUBLESHOOTING GUIDE PROBLEM PROBABLE CAUSE SUGGESTIONS The device does not The ramp is activated. -Check that the ramp indicator is dis- produce correct played. Press the ramp button to cancel the pressure.
  • Page 47 GoodKnight 425 / 425 ST Service Manual PROBLEM PROBABLE CAUSE SUGGESTIONS In 01 is displayed. The mask and/or the patient -Check the connection between mask, patient tube is disconnected. tube and device. The message disappears once the connections are correctly estab- lished.
  • Page 48 GoodKnight 425 / 425 ST Service Manual E. ERROR MESSAGES CODE DESCRIPTION CORRECTIVE ACTION Er01 -Settings data checksum error. -Perform reconfiguration (refer to page III-14). -The unit is staying set with a -If the message persists, change the internal frame assembly EPAP value >...
  • Page 49 (see page III-22). HISTORY RECORD FORM ¨ At the end of this manual, you will find an example of the GoodKnight 425/425ST History Re- cord Form. This form will help you in all the stages of servicing. This form can be copied.
  • Page 50 GoodKnight 425 / 425 ST Service Manual Personal Notes P/N: M-145MAT00-20 Rev. A - Page Rev.A III-28...
  • Page 51 GoodKnight 425 / 425ST Service Manual IV - SPARE PARTS P/N: M-145MAT00-20 Rev. A - Page Rev.A IV-1...
  • Page 52 GoodKnight 425 / 425ST Service Manual Part # Description M-314530-00 Top Housing equipped 425 International M-314530-01 Top Housing equipped 425ST International M-314530-02 Top Housing equipped 425 USA M-314530-03 Top Housing equipped 425ST USA M-313940-01 Bottom housing 425 / 425ST M-314560-00 Internal frame assembly 425 (equipped with blower and electronic board factory set).
  • Page 53 HISTORY RECORD FORM (1/2) GoodKnight425 GoodKnight 425ST SERIAL # CUSTOMER RETURN # REPORTING # Compliance Meter # DATE Hour Meter Hour Meter (Before servicing) (After servicing) Embedded Ver. Embedded Ver. (Before servicing) (After servicing) Failure Error messages and information recorded in the memory : Error Messages Information Messages Servicing Done...
  • Page 54 HISTORY RECORD FORM (2/2) PERFORMANCES VERIFICATION Pressure Ramp Test succeeded (1) Yes — No 3 cmH O set measured 14 cmH O set measured Flow (step 25 cmH O set measured Flow (step Backup Frequency (425ST) Setting: F=10 IPAP=14 EPAP=8 I/E=1:1.0 Measured Frequency c/min CALIBRATION...
  • Page 55 GoodKnight 425 / 425ST Service Manual P/N: M-145MAT00-20 Rev. A - Page Rev.A...
  • Page 56 GoodKnight 425 / 425ST Service Manual MALLINCKRODT DEVELOPPEMEN FRANCE Parc d'Activités du Bois St Julien 10 allée Pelletier-Doisy 54601 VILLERS LES NANCY CEDEX Tél: 33 (0) 3.83.44.85.00 P/N: M-145MAT00-20 Rev. A - Page Rev.A...

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